Tuesday, June 24, 2008

Lightining


Contrary to the common expression, lightning can and often does strike the same place twice, especially tall buildings or exposed mountaintops. Cloud-to-ground lightning bolts are a common phenomenon—about 100 strike Earth’s surface every single second—yet their power is extraordinary. Each bolt can contain up to one billion volts of electricity.

This enormous electrical discharge is caused by an imbalance between positive and negative charges. During a storm, colliding particles of rain, ice, or snow increase this imbalance and often negatively charge the lower reaches of storm clouds. Objects on the ground, like steeples, trees, and the Earth itself, become positively charged—creating an imbalance that nature seeks to remedy by passing current between the two charges.

A step-like series of negative charges, called a stepped leader, works its way incrementally downward from the bottom of a storm cloud toward the Earth. Each of these segments is about 150 feet (46 meters) long. When the lowermost step comes within 150 feet (46 meters) of a positively charged object it is met by a climbing surge of positive electricity, called a streamer, which can rise up through a building, a tree, or even a person. The process forms a channel through which electricity is transferred as lightning.

Some types of lightning, including the most common types, never leave the clouds but travel between differently charged areas within or between clouds. Other rare forms can be sparked by extreme forest fires, volcanic eruptions, and snowstorms. Ball lightning, a small, charged sphere that floats, glows, and bounces along oblivious to the laws of gravity or physics, still puzzles scientists.

Lightning is extremely hot—a flash can heat the air around it to temperatures five times hotter than the sun’s surface. This heat causes surrounding air to rapidly expand and vibrate, which creates the pealing thunder we hear a short time after seeing a lightning flash.

Lightning is not only spectacular, it’s dangerous.

About 2,000 people are killed worldwide by lightning each year. Hundreds more survive strikes but suffer from a variety of lasting symptoms, including memory loss, dizziness, weakness, numbness, and other life-altering ailments.

Hurricanes


Hurricanes

Hurricanes are giant, spiraling tropical storms that can pack wind speeds of over 160 miles (257 kilometers) an hour and unleash more than 2.4 trillion gallons (9 trillion liters) of rain a day. These same tropical storms are known as cyclones in the northern Indian Ocean and Bay of Bengal, and as typhoons in the western Pacific Ocean.

The Atlantic Ocean’s hurricane season peaks from mid-August to late October and averages five to six hurricanes per year.

Hurricanes begin as tropical disturbances in warm ocean waters with surface temperatures of at least 80 degrees Fahrenheit (26.5 degrees Celsius). These low pressure systems are fed by energy from the warm seas. If a storm achieves wind speeds of 38 miles (61 kilometers) an hour, it becomes known as a tropical depression. A tropical depression becomes a tropical storm, and is given a name, when its sustained wind speeds top 39 miles (63 kilometers) an hour. When a storm’s sustained wind speeds reach 74 miles (119 kilometers) an hour it becomes a hurricane and earns a category rating of 1 to 5 on the Saffir-Simpson scale.

Hurricanes are enormous heat engines that generate energy on a staggering scale. They draw heat from warm, moist ocean air and release it through condensation of water vapor in thunderstorms.

Hurricanes spin around a low-pressure center known as the “eye.” Sinking air makes this 20- to 30-mile-wide (32- to 48-kilometer-wide) area notoriously calm. But the eye is surrounded by a circular “eye wall” that hosts the storm’s strongest winds and rain.

These storms bring destruction ashore in many different ways. When a hurricane makes landfall it often produces a devastating storm surge that can reach 20 feet (6 meters) high and extend nearly 100 miles (161 kilometers). Ninety percent of all hurricane deaths result from storm surges.

A hurricane’s high winds are also destructive and may spawn tornadoes. Torrential rains cause further damage by spawning floods and landslides, which may occur many miles inland.

The best defense against a hurricane is an accurate forecast that gives people time to get out of its way. The National Hurricane Center issues hurricane watches for storms that may endanger communities, and hurricane warnings for storms that will make landfall within 24 hours.

Avalanches


Avalanches

Yet in 90 percent of avalanche incidents, the snow slides are triggered by the victim or someone in the victim's party. Avalanches kill more than 150 people worldwide each year. Most are snowmobilers, skiers, and snowboarders.

Many avalanches are small slides of dry powdery snow that move as a formless mass. These "sluffs" account for a tiny fraction of the death and destruction wrought by their bigger, more organized cousins. Disastrous avalanches occur when massive slabs of snow break loose from a mountainside and shatter like broken glass as they race downhill. These moving masses can reach speeds of 80 miles (130 kilometers) per hour within about five seconds. Victims caught in these events seldom escape. Avalanches are most common during and in the 24 hours right after a storm that dumps 12 inches (30 centimeters) or more of fresh snow. The quick pileup overloads the underlying snowpack, which causes a weak layer beneath the slab to fracture. The layers are an archive of winter weather: Big dumps, drought, rain, a hard freeze, and more snow. How the layers bond often determines how easily one will weaken and cause a slide.

Storminess, temperature, wind, slope steepness and orientation (the direction it faces), terrain, vegetation, and general snowpack conditions are all factors that influence whether and how a slope avalanches. Different combinations of these factors create low, moderate, considerable, and high avalanche hazards.

If caught in an avalanche, try to get off the slab. Not easy, in most instances. Skiers and snowboarders can head straight downhill to gather speed then veer left or right out of the slide path. Snowmobilers can punch the throttle to power out of harm's way. No escape? Reach for a tree. No tree? Swim hard. The human body is three times denser than avalanche debris and will sink quickly. As the slide slows, clear air space to breathe. Then punch a hand skyward.

Once the avalanche stops, it settles like concrete. Bodily movement is nearly impossible. Wait and hope for a rescue. Statistics show that 93 percent of avalanche victims survive if dug out within 15 minutes. Then the survival rates drop fast. After 45 minutes, only 20 to 30 percent of victims are alive. After two hours, very few people survive

Desert

esert:

Not all deserts are hot

Because the definition of a desert is that it lacks moisture, a desert is not defined as being hot. For example, the Atacama Desert in Chile is considered the driest place on earth and it is rather cold for a desert, with daily temps from 32°F to 77°F (1). Some deserts are cold because of their altitude, some are cold because they are so far from the equator (polar deserts) and others are cold because of a dominant cold wind flow.

Here's a couple reasons why some deserts are hot:

1) Many deserts are largely influenced by something called a subtropical high pressure. Subtropical refers to it's location, out of the tropics. High pressure is an area of sinking air. As air sinks, it heats up. Not only that, but the warmer air will aid in evaporating water. So, Under a large area of high pressure that rarely moves, there is sinking air which warms the earth and evaporates water from the soil...perfect for a hot desert!

2) Sunlight energy can be used to evaporate water. If there is little to no water to evaporate, then all of that sunlight energy is absorbed by the earth. Then the earth emits more energy into the air thus heating the air even more.

3) The closer a desert is to the equator, the closer it is to the most intense sunshine all year long. The more intense the sunshine, the hotter the land and air will get.

Thursday, June 19, 2008

Weddell seals Of Antarctic



Weddell seals are animals of the ice. They live further south than any other mammal. Between the end of August and early November in the southern hemisphere spring, the females haul themselves out of holes in the ice and give birth to their pups.

When born, Weddell seal pups look like unstuffed pyjama cases, all skin and flippers and not much content. Over the next few weeks the change in mother and pup is like one balloon deflating and filling up another.

Weddell seal milk is one of the richest produced by any mammal. It contains about 60% fat (go and compare that to the label on the milk carton in the fridge) and it is this that is responsible for the rapid weight gain made by pups shortly after birth. They are weaned (stop drinking milk and begin eating normal seal food, i.e. fish) at around 7 weeks when they should have reached about 110kg (242lb). When adult, they will weigh up to 400kg (880lb) and be up to 3m (10ft) long. Unusually, the males are slightly smaller than the females.

Pups are encouraged into the water very early on by their mothers, perhaps only a week or so after birth. The water is their natural habitat and with their thick protection of blubber is a more comfortable place to be most of the time fseals than out on the ice where the temperature can be -40° Cor these or less with winds frequently of gale force or greater.

It contains about 60% fat (go and compare that to the label on the milk carton in the fridge) and it is this that is responsible for the rapid weight gain made by pups shortly after birth. They are weaned (stop drinking milk and begin eating normal seal food, i.e. fish) at around 7 weeks when they should have reached about 110kg (242lb). When adult, they will weigh up to 400kg (880lb) and be up to 3m (10ft) long. Unusually, the males are slightly smaller than the females.


Antartic Weddell seals



Weddell seals are animals of the ice. They live further south than any other mammal. Between the end of August and early November in the southern hemisphere spring, the females haul themselves out of holes in the ice and give birth to their pups.

When born, Weddell seal pups look like unstuffed pyjama cases, all skin and flippers and not much content. Over the next few weeks the change in mother and pup is like one balloon deflating and filling up another.

Weddell seal milk is one of the richest produced by any mammal. It contains about 60% fat (go and compare that to the label on the milk carton in the fridge) and it is this that is responsible for the rapid weight gain made by pups shortly after birth. They are weaned (stop drinking milk and begin eating normal seal food, i.e. fish) at around 7 weeks when they should have reached about 110kg (242lb). When adult, they will weigh up to 400kg (880lb) and be up to 3m (10ft) long. Unusually, the males are slightly smaller than the females.

Pups are encouraged into the water very early on by their mothers, perhaps only a week or so after birth. The water is their natural habitat and with their thick protection of blubber is a more comfortable place to be most of the time for these seals than out on the ice where the temperature can be -40° C or less with winds frequently of gale force or greater.

Diet:The diet is primarily fish and squid. The Antarctic silverfish and the emerald rock-cod are preferred species. In the summer, Weddell seals forage slightly more at night than during the day and they apparently eat their food underwater. In the summer and winter, when there are few environmental time cues, Weddell seals may use tidal movements to determine the best hunting opportunities. While Weddell seals may get all the water they need from their food or from metabolizing sea water, individuals have occasionally been seen eating snow
Weddell seals groom parts of their bodies they can reach with nails on their fore-flippers; they roll and rub themselves on the ice to groom areas the flippers cannot reach

Antarctica



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Antarctic birds

Unusually for Antarctic birds, snow petrels seem to apply some thought to the practicalities of a nest site. This pair are at the intrance to their nest which has been made in a natural crevice amongst some large broken-up rocks. This is a frequent choice for a nest site though not always available or in plentiful supply as snow petrels nest very far south and such crevices are frequently snowed or iced up.

Attempting to approach a nest (as I did on many occasions when helping in a long term programme on nesting success) brings out the worst in snow petrels. A well aimed stream of foul smelling, bright pink, oily, semi-digested krill mixed with oily stomach secretions would come in your direction in their (admirably unpleasant) defence mechanism.

Snow petrels have been known to nest far inland on the Antarctic continent, nearly 200km. from the nearest sea that they must travel to in order to feed. They must nest on rock and in these cases choose nunataks isolated outcrops of tall rock ridges and mountains that protrude above the surrounding ice from the bed rock.

There are more Adelie penguins than any other penguin species. They live in the deep south and as such frequently have to cross many kilometers of ice still bound to the continent or islands to reach land in the spring where they can build their nests. Sometimes they have to travel as much as 100 kilometers, though usually 20-40 is more usual. A long walk nevertheless.

This pair were early arrivals in spring at an Antarctic Island near the northern edge of their breeding range and only had about half a kilometer to waddle and "toboggan".

Tobogganing is a way of getting around where there is smooth snow or ice. The penguin lies on its stomach and propels itself along using its feet, an efficient use of energy and one where the penguin can easily keep up with a running man.Adelie penguins weigh about 5kg and are around 70cm tall. They winter on the pack ice where the air temperature is higher than on land and where they can find cracks in the ice to fish through. In October, they begin to move south to their breeding grounds, the males arriving first to establish territories and nest spaces with the females arriving shortly afterwards.

some hours later have returned. In the meantime the tide has gone out. Still attached to the land is the "ice-foot" an ice step left behind as the tide rises and falls in the winter months to which the floating sea ice is loosely attached. When the sea ice breaks out, the ice-foot is left behind for a period of days to weeks before rising temperatures and the waves cause this to break off too.

So what was a short hop down for the penguins is now a step too high for them. I spent a couple of hours one afternoon watching and following an ever increasing number of penguins as they came back from their fishing trip. They wandered up and down the shore-line trying to find somewhere to get up, but to no avail. Eventually, the tide came back in and so they floated back up to the right level and were able to get back to their nests. The ice-foot broke off completely a few days later in a mild storm.

Wednesday, June 18, 2008

GOOSEBERRY STATEPARK


Naturalist:

Naturalist programs and activities are offered weekly from Memorial Day - Labor Day and on a limited basis at other times. Topics include area resources such as plants, animals, geology, Lake Superior, history, recreation, and more. Be sure to stop by the visitor center and outdoor Gateway Plaza to view interpretive displays and signs.

Wildlife

The park has recorded over 225 species of birds that nest or visit the park, 46 species of mammals, and ten species of reptiles and amphibians. Of special interest to visitors are white-tailed deer, black bears, gray wolves, pine martens, migratory Lake Superior salmon and trout, a variety of conifer-dependent birds, ravens, and the herring gulls that establish nesting colonies along the lakeshore. During fall and spring, many migratory birds can be seen because the park is along the North Shore flyway

History

The area known as Gooseberry Falls State Park is intricately tied to human use of Lake Superior. At different times, the Cree, the Dakotah, and the Ojibwe lived along the North Shore. As early as 1670, the Gooseberry River appeared on explorer maps. The river was either named after the French explorer Sieur des Groseilliers or after the Anishinabe Indian name, Shab-on-im-i-kan-i-sibi; when translated, both refer to gooseberries. In the 1870s, commercial and sport fishermen began to use this area. By the 1890s, logging became the principle use of the land around the Gooseberry River. In 1900, the Nestor Logging Company built its headquarters at the river mouth and a railway was used to carry the pine to the lake for rafting to the sawmills. Because of fires and intensive logging pressures, the pine disappeared by the early 1920s.

With the rise of North Shore tourism in the 1920s, there was a concern that the highly scenic North Shore would be accessible only to the rich. As a result the Legislature authorized preservation of the area around Gooseberry Falls in 1933. The following year, the Civilian Conservation Corps (CCC) began to develop the park. CCC crews built the park's stone and log buildings and the 300-foot long "Castle in the Park" stone retaining wall. They also laid out the original campground, picnic grounds and trails. The area officially became Gooseberry Falls State Park in 1937. The CCC camps closed in 1941, but the park's CCC legacy lives on. Designed with ties to the CCC, a new visitor center/wayside rest and Highway 61 bridge was opened in 1996

Geology

Geologists have determined that about 1.1 billion years ago, the Earth’s crust began to split apart along a great rift zone now covered by Lake Superior. Huge volumes of lava flowed out onto the surface and cooled to form volcanic bedrock, mainly the dark type known as basalt. Several lava flows can be seen at the Upper, Middle, and Lower Falls and south of the Gooseberry River along the Lake Superior shore. The rifting also caused the flows to tilt gently toward the lake. These basalt lava flows, all along the North Shore, are also the birthplaces of Lake Superior agates. About two million years ago, the Great Ice Age began as periodic glaciers advanced into the region from the north. As they ground across the area, they changed the landscape dramatically, especially by excavating the whole basin now occupied by Lake Superior. About 10,000 years ago the last glacier melted back, allowing the basin to fill with water and starting the erosional process that creates the river gorges and waterfalls. Today, water, wind, and weather continue to shape the North Shore.

Landscape

Rocky Lake Superior shoreline, five waterfalls, Gooseberry River and gorge, Agate Beach and the Picnic Flow highlight the park. Trails lead through a fairly diverse vegetative cover of mixed evergreen, aspen and birch forests that provide habitat for a variety of birds, plants and other animals. Because the local climate is moderated by Lake Superior, some disjunct populations of arctic-alpine plants can be found in the park.

CUMBERLAND FALLS STATE PARK



On August 21, 1931, Cumberland Falls State Park became the third Kentucky state park to receive Commonwealth endorsement. Many factors were involved in this achievement, but perhaps the most significant and continuing force behind the establishment and development of the park as we know it today was a man from Corbin, Kentucky Robert Blair. Described from the 1930s on as the "Keeper of the Keys" to the park or "Mr. Cumberland Falls," this doughty, feisty, energetic and undaunted preservationist fueled a community's protective concern and inspired state and national support not only to establish Cumberland Falls State Park but to preserve it against all assaults. Much like an advance observer for a rifle platoon or a cavalry patrol in the Old West, Blair was always there to sound the alarm when hostiles revealed their presence.

What were the dangers? From Blair's point of view efforts to reshape the natural characteristics of the park are, particularly the falls itself, represented destruction of God-given beauty. The only changes he countenanced were those that offered opportunities for more people to view and enjoy that which God had wrought. Hence, entrepreneurs who desired to use the natural resources of the area for private gain were enemies. Those who wished to preserve it as much as possible in its natural state were friends. For Blair there was no room for compromise.

Thus when the Cumberland River Power Company, one of multiple subsidiaries of Sam Insull's Midwest Utilities company, prepared to erect an eighty-seven-foot-high dam upstream to divert water from the falls for hydroelectric production, Blair was alarmed. From that point on until the electric company sold its rights to the state of Kentucky, "Mr. Cumberland Falls" fought energetically against the proposition. He was not alone. Before the struggle ended, Blair's efforts inspired strong support from Corbin citizens, Kentucky newspapers, congressional progressives, and an increasingly strong national preservationist movement across the United States.

The first step came in 1927 when Blair and three other locals drove an automobile eighteen miles from Corbin to the site of the falls using an old logging trail. The ten-hour round trip prompted Corbin citizens to band together and build a road including a thirty-foot-high trestle dryland bridge.

The job took two months and stimulated national as well as statewide interest. It also prompted those who supported construction of a dam to greater efforts. The seat of those efforts was Williamsburg, Kentucky. Attracted by the possibilities of a large lake that would back up to their community; leaders of the town became allies of the Cumberland River Power Company. Lawyer H.H. Tye, for example, argued that parks were a waste of time, appealing only to the "idle rich," while the dam would enrich the area through tax revenues and by expenditures of construction workers. One McCreary county man insisted that people he represented overwhelmingly favored a power dam even though most people from the Corbin area opposed it.

Corbin citizens reacted by establishing the Cumberland Falls Preservation Association dedicated "solely" to the establishment of a state park at the fall, although it seemed that the federal government would soon grant a license for dam construction. When Federal Power Commission chairman Herbert Work, who was also Secretary of the Interior, came to Kentucky in 1928 to investigate, he found people at a Middlesboro public meeting grimly hostile to preservation. They talked of the inaccessibility of the falls, the surrounding and unattractive wasteland full of black snakes and seed ticks. Putting all this under a deep lake seemed to them to be an idea whose time had come. Only one man present objected to all this -- Robert Blair of Corbin. With the courage and determination of an Horatius at the bridge, he denounced what he called the shortsightedness and greed of those around him. One person threatened him, and according to Blair, was forestalled only by Chairman Work's statement to the people that all should "remember that one righteous man [could have] saved Sodom."

Later Blair and his CF PA cohorts got Work to visit Corbin and kept opponents away while they argued their case. The beleaguered FPC chairman did not commit himself, other than to agree that erection of a power plant would probably destroy the falls. Work spared himself further consternation by resigning from the cabinet to become the chairman of the Republican national committee. Supporting the election to the presidency of his friend, Herbert Hoover, may have seemed a less controversial responsibility.


It soon became apparent that the controversy was basically between preservationists on the one hand and business promoters on the other. Money to purchase the land from the Cumberland River Power Company had been available for over a year in the form of a gift from Senator T. Coleman du Pont of Delaware. The only stipulation was that the area had to be maintained as a park, a wild animal preserve, and a bird sanctuary. Kentucky Governor Flem Sampson tried, without success, to persuade du Pont to combine a state park with hydroelectric development. Consequently, the governor, a Barbourville native, worked out an arrangement with the power company whereby the governor would support power dam objectives in exchange for $250,000 from the company to finance a state park. Hence the issue was joined. Both sides favored a park. One side wanted a park with some evidence of modern development. The other believed that industrialization would destroy the very values that a park would preserve.

A succession of fortuitous events favorable to preservationists ensued. New FPC personnel in the Hoover administration visited Cumberland Falls itself to study the situation first hand. They might have reached a verdict favorable to power dam enthusiasts, but the chairman of the FPC at t hat time, Secretary of War James Good, died from blood poisoning following an emergency appendectomy only five weeks after the visit. With the FPC decision placed on hold as a result, the battle shifted to Frankfort, Kentucky, where preservationists now mounted a powerful assault against Governor Sampson by joining with Democrats determined to undermine his gubernatorial authority in its entirety. Even the governor's subsequent veto of legislation to accept du Pont's gift could not withstand the pressure. The preservationists were totally victorious. By dedication time in August 1931, the intense emotion of the past had abated. Joining in the ceremonies were representatives from each side.

Yet on the local scene it was apparent that Corbin had triumphed over Williamsburg. The state immediately moved to improve the now somewhat rundown road to the falls from Corbin. Corbin locals, particularly Robert Blair, became much more involved in promoting tourism in the area, protecting the park and identifying with its future. Anything affecting the region was now a matter of basic concern to "Mr. Cumberland Falls" and his allies.

In 1965 the Corps of Engineers proposed to build a power plant by tunneling around the falls and diverting water to make electric power. Blair led successful resistance by reestablishing the CFPA, and the Corps of Engineers found other projects to play with. Nine years later when artful money-makers endeavored to install a chair lift near the falls, which would have necessitated the hacking down of considerable timber, Blair again blew his trumpet. Governor Wendell Ford halted the project.

I met Robert Blair in 1981 about ten months before his death. His office at that time was in the First National Bank building in Corbin, located somewhat apart from the rest of the financial institution on the second floor. He called it a museum office and he was right. Over the entry was his named followed by the simple title -- "Conservationist." He was chairman of the board of the bank, but nothing in the office suggested that.

Those who pride themselves on orderly decor would have been appalled by the clutter, but also impressed by the wide variety of treasured mementos. Arrowheads gathered in his many hikes through the forests around Corbin lined the wall. Stone knives, hoes, and cooking utensils used by Indians in the area were there. Old pictures of the falls were everywhere. There was even the gold-plated spike that was removed from the old trestle bridge when it was replaced.

Other items, and there were many, did not relate to the falls, but reflected Blair's lifelong love affair with the outdoors. Mounted fish and the heads of a mountain lion and four bears, plus the stuffed bodies of a bobcat and a beaver, stood out prominently. Lest one regard him as only a trigger-happy sportsman, Blair was quick to explain that he not only killed but he also consumed the meat of his prey. The three-hundred pound mountain lion, for example, at one time connected to the head now on his wall, had been processed into hamburger- the best hamburger he ever ate, he said.



McArthur-Burney Falls Memorial SP


The park is within the Cascade Range and Modoc Plateau natural region, with forest and five miles of streamside and lake shoreline, including a portion of Lake Britton.

The park's centerpiece is the 129-foot Burney Falls, which is not the highest or largest waterfall in the state, but possibly the most beautiful. Additional water comes from springs, joining to create a mist-filled basin. Burney Creek originates from the park's underground springs and flows to Lake Britton, getting larger along the way to the majestic falls.

The park's landscape was created by volcanic activity as well as erosion from weather and streams. This volcanic region is surrounded by mountain peaks and is covered by black volcanic rock, or basalt. Created over a million years ago, the layered, porous basalt retains rainwater and snow melt, which forms a large underground reservoir.

Within the park, the water emerges as springs at and above Burney Falls, where it flows at 100 million gallons every day.

Burney Falls was named after pioneer settler Samuel Burney who lived in the area in the 1850s. The MacArthur’s were pioneer settlers who arrived in the late 1800s. Descendants were responsible for saving the waterfall and nearby land from development. They bought the property and gave it to the state as a gift in the 1920s.

Location-Directions
The Park is northeast of Redding, six miles north of Highway 299 on Highway 89 near Burney.

Special Events
On the Sunday of Columbus Day weekend, the park hosts Heritage Day, featuring demonstrations and recreations of activities and crafts common to people during the late 19th century.

Seasons/Climate/Recommended Clothing
Summer and spring are warm; fall and winter can be cool. Layered clothing is advised.

Hiking
There are five miles of hiking trails winding through the park's evergreen forests. The Pacific Crest Trail passes through the park.