Early this February the states surrounding the great lakes in the northeast were pounded by lake-effect snow storms. Some areas saw more than four feet of snow. These states are accustomed to lake-effect snow storms, but it has been some time since they last saw one of this magnitude. Some areas saw up to 140 inches in less than twelve days. The storm was accountable for 35 deaths. (msn.com 2007)
States on the lee, or down wind, sides of the great lakes receive lake-effect snow every year. For some cities this can push the average snowfall up to 400 inches. During the February storm of this year records were broken for the most snowfall in one storm. For a duration of the storm snow was falling at a rate of six inches or more per hour. Some of the images captured from the event leave some in disbelief that such a thing could even happen. Storms of this magnitude completely shut down all activity. Many areas do not have equipment capable of handling such mass amounts of snow, and even if they do the task is overwhelming. (weather.com 2006)
The concept of lake-effect snow is rather simple. It starts when cold arctic air from Canada moves southwest across the great lakes, which are warmer than the air. As the air moves across the lakes evaporation occurs. The moist air is cooled as it is lifted up and then turned into snow. This snow does not stop until the cold arctic winds stop drifting across the lakes. Hills and valleys on the shore of the lakes intensify the amount of snow an area receives. The shore of the lakes as well as, any hills or valleys, cause the masses of moist air to slow down and “pile up”.
Lake-Effect snow has a range of different intensities depending upon certain factors. The difference between the air temperature and the water temperature will determine how much moisture is taken into the air. Warmer water and colder air makes for more snow. Also the distance the air has to travel across the lake will determine how much moisture the air is able to obtain. The ability of the storm to travel inland will be determined by the intensity of the storm’s winds. Storms also are able travel farther inland in late fall and early winter.
Lake-Effect snow storms typically take the form of flurries and are limited to a small areas.
Glacial Lake Peterborough had many attributing spillways attached to it, feeding meltwater and sediment from the ice margin and or other glacial lakes. Much of the sediment that was deposited in Glacial Lake Peterborough came from either from the stagnant ice blocks located on the Oak Ridges moraine or from the Lake Algonquin drainage system. Much of the deposition in this lake was dominated by sediment stratification, which may have been largely influenced by thermal stratification. As a result of thermal stratification occurring in this glacial lake sediment inputs were greatly influenced depending on the different sediment densities between the lake bottom water to that of the incoming meltwater and if the inflow density was less/more than the bottom water than the lake water bottom, than new transport and depositional paths were created
Lassen Peak has the highest known winter snowfall amounts in California. There is an average annual snowfall of 660 in, and in some years, more than 1,000 inches of snowfall at its base altitude of 8,250 feet at Lake Helen.
Glaciers have drastically changed over time because on average, “glaciers worldwide have been losing mass since at least the 1970s”. The melting of glaciers has been contributing to the rise in sea level because the glaciers have been shrinking faster in the last decade. Three of the major glaciers in the us have shown an overall drop in mass since the 1950s and 1960s and an accelerated rate of decline in recent years. An ice cap covered Mt. Hood during the Ice Age, from about 1.8 million years ago to about 10,000 years ago. These ice caps covered the Oregon Cascades, a series of mountains in Oregon, with glaciers going down on the east and west sides of the range. These glaciers melted into smaller glaciers as the weather proceeded to get warmer...
The term snow is usually restricted to material that fall during precipitation in the form of small white ice crystals formed directly from the water vapour of the air at a temperature of less than 0°C and has not changed much since it fell. A fall of snow on a glacier surface is the first step in the formation of glacier ice, a process that is often long and complex (Cuffey and Paterson, 2010). The transformation of snow to ice occurs in the top layers of the glaciers and the time of the transformation depends mostly on the temperature. Snow develops into ice much more rapidly on Temperate glaciers, where periods of melting alternate with periods when wet snow refreezes, than in Polar glaciers, where the temperature remains well below the freezing point throughout the year. The density of new snow as it falls on glacier surface depends mostly on the weather conditions. In clam conditions, the density of new snow is ρs ≈ 50 – 70 kg m-3 (Table 1.1). If it is windy, there is breaking of the corners of snowflakes, and the density is more like ρs ≈ 100 kg m-3. After the snow has fallen on the surface, there are three processes that are all active together and work to transform the snow to ice.
I would like to start out by what we know about tornados and outbreaks, and what is said to be the cause of such catastrophic events, such as the outbreak that occurred November 17th in the Midwestern, portion of the United States. Tornado outbreaks occur when there are multiple tornados that are said to be produced by the same weather system. The classification of an outbreak can vary depending on interpretation. It is said that in order to be classified as a “tornado outbreak” there must be a certain number of tornados that touch down. It is said that the US has the most tornados of any country. This can be attributed the location with in the mid latitude. The Rocky Mountains, have the ability to block moisture and “buckle” the atmospheric flow; thus forcing a lot of dry air at mid-levels of the troposphere, due to downslope winds. While the Rockies are forming a “dry-line” the Gulf of Mexico on the other hand contributes a lot of low level moisture. This mixture of warm air and cold air is to blame for the large number of tornados that form in the US. These events are most prevalent in the Midwestern and Southeastern United States, along with the Great Plains also known as (tornado alley) although some of these systems have been known to move as far North as Canada. The tornado outbreak that took place on the 17th of November is said to have been the one of the largest outbreaks to have occurred in eight years. This particular storm spawned a total of 72 tornados that swept through seven states, according to the National Weather Service. This outbreak is being considered the fourth largest outbreak of its kind, especially this time of year.
WHITE HURRICANE November gales are a curse on the Great Lakes. In 1835, a storm was said to have "swept the lakes clear of sail." Lake Erie was blasted by 60 mph winds on November 22 and 23, 1874. On Nov. 25, 1905 a November gale sank or stranded more than 16 ships. On Nov 11, 1940 (Armistice Day Storm) a storm wrecked 12 vessels.
Some say that the only reason glaciers are melting is because of low evaporation and not hot temperatures. That is one of the reasons , but the other is because there is some mu...
When we think of Christmas weather, “snow” comes to mind. From making snow angels, building snowmen, throwing snowballs, and catching snowflakes on our tongues, we anticipate living in every single moment of this Winter Wonderland. However, at any time, this perfect depiction of a Winter Wonderland could unravel unexpectedly to becoming a Winter Disaster, known as a snow blizzard. In accordance to the National Weather Service that the LIVESCIENCE website quotes of, a blizzard is a “storm with considerable falling or blowing snow and winds in excess of 35 mph and visibilities of less than ¼ mile for at least 3 hours.” The Great Blizzard of 1888 overshadowed New York City to become a city that was fully covered in snow ruins as it took its toll
January 12, 1888, a blizzard covered the northwest part of North America that claimed many lives. This blizzard was considered to be the worst blizzard of all time, and was dubbed the “the Schoolchildren’s Blizzard”, for claiming the lives of so many school children on their way home. The death toll of this murderous blizzard rose, because of lack of preparation and being uninformed. During this time, many farmers and families were unprepared to survive a blizzard of this magnitude, by the lack of clothing they wore. Forecasters were not as accurate enough to inform people on the weather conditions. Also, shelter was a major factor in protecting themselves from the winter storms, but the shelter was not stable
Many Southerners don’t understand the new hazards that are brought on by extreme cold weather. Last year 8 people died due to cold weather and 29 in 2011. Some of these dangers include; chilblain, hypothermia, frostbite, trench foot, and snow blindness. Here are some suggestions that will keep you warm and safe!
The foundation of the Great Lakes began around three billion years ago, which is known as the Precambrian Era. The Precambrian Era contains numerous ecological events, which consists of volcanic activity to erosion to the mountains and hills seen today being formed. Then during the Pleistocene Epoch or known as the “Ice Age, occurred between 1.6 million and 10,000 years ago. At least four times during the Pleistocene Epoch, large masses of ice advanced and retreated over the surface of what is now North America. As the glaciers advanced, giant sheets of ice flowed across the land, leveling mountains and carving out massive ...
"Snow Storms: What's a Blizzard." Forces of Nature: TQ 2000. Web. 3 Mar. 2014. .
Warm ocean water serves as the energy to power hurricanes and other tropical storms. The storms and hurricanes get fiercer with faster winds and denser rain when the upper layer of the ocean gets warm. Climate change causes storms to be more extreme because of the higher heat and added evaporation. Storms in the Atlantic have become even stronger over the past twenty years. The United States has also experienced more powerful one-day storms since the 1980’s that generate rain and snow at an unusual rate (**). With the weather getting warmer, it is expected that heavier snowstorms and rainstorms will happen more often, and that storms around the globe will keep getting stronger. Storms and hurricanes are hazards that can damage buildings, hurt crops, cause floods, and put people’s lives in danger.
A thunderstorm that produces large amounts of precipitation which reaches the ground should have deep moisture stratums in unstable conditions, causing enough convection to be restricted to the electrification level of the atmosphere, or being lifted by orographic or frontal systems (Rorig and Ferguson, 1999). However, some thunderstorms produce small amounts of precipitation or none. Colson (1960) explained this phenomenon as a result of high-level thunderstorms with high cloud bases where the appropriate conditions for triggering lightning flashes accompanied by precipitation are situated in the upper levels. Rorig and Ferguson (1999) analysed the synoptic patterns of dry thunderstorms and concluded that low moisture levels in the inferior part of the atmosphere coupled with high instability, leads to the evaporation of precipitation prior to reaching the ground level, this way reducing the moisture content of the underlying surface.
Precipitation: Clouds in the air drop rain on land in the form of water, hail or snow.