EUA- Gigantesca "Nor'easter" 15-04-2007
Prevê-se para amanhã, Domingo, uma grande "Nor'easter".
GFS:
Mais informação:
Para quem não sabe o que é uma Nor'easter, talvez tenham visto o filme (e livro) "The Perfect Storm" que era sobre uma Nor'easter de 1991, a Halloween Nor'easter, que ficou para a história como a "Tempestade Perfeita"
Algumas explicações sobre a Nor'easter:
Prevê-se para amanhã, Domingo, uma grande "Nor'easter".
GFS:
![](http://img181.imageshack.us/img181/2517/gfsslp042mgh3.th.gif)
Mais informação:
Hurricane-like Nor'easter may form Sunday
A major spring Nor'easter with the capability of causing damage equivalent to a Category 1 hurricane may develop Sunday off the U.S. East Coast. A storm system currently crossing the Pacific coast near British Columbia is expected to dive southeastward across the U.S., possibly triggering a significant severe weather outbreak over Texas, Louisiana, and Arkansas on Friday. The storm will emerge into the Atlantic on Sunday near the Virginia Coast and rapidly intensify. By Monday morning, the GFS model is forecasting a 975 mb low pressure system just off the New Jersey coast, with 50-60 mph easterly winds over Long Island Sound and the waters just south of Long Island. The 00Z UKMET model forecasts an even more intense system, similar in strength to a Category 1 hurricane. Other reliable models are less gung-ho. The European model has the storm bottoming out at a pressure of 985 mb, and the NOGAPS model, 982 mb. However, of great concern is the fact that most of the models forecast a very slow moving system that will weaken only gradually, battering the coast for at least three days. This will allow a long period of time for the tropical-storm force winds over the water to pile up high storm surges in Long Island Sound and along the entire Northeast coast from New Jersey to Maine. Combine this with the arrival of one of the highest tides of the year Monday night--the Spring Tide, which occurs at the time of the new moon in April--and we have the potential for a very serious flooding event. If the worst case scenarios of the models come true, the Tax Day Storm of 2007 could cause extensive moderate to severe coastal flooding, costing hundreds of millions of dollars. The areas at highest risk appear to be New Jersey, New York (especially New York City), Connecticut, Rhode Island, and Massachusetts. Heavy snow is not expected along the coast, but heavy rains may cause flooding problems. As usual, there is considerable uncertainty about the exact track and intensity of the storm, and we'll have a better idea Friday what might be in store for New England. However, I believe there is a greater than 50% chance that this Nor'easter will be strong enough to cause significant storm surge flooding along the New England coast. Damages of at least $100 million are likely.
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Figure. Forecast from the GFS model for 2am EDT Monday April 16, showing a major Nor'easter off the coast of New England.
http://www.wunderground.com/blog/JeffMasters/show.html
Para quem não sabe o que é uma Nor'easter, talvez tenham visto o filme (e livro) "The Perfect Storm" que era sobre uma Nor'easter de 1991, a Halloween Nor'easter, que ficou para a história como a "Tempestade Perfeita"
Algumas explicações sobre a Nor'easter:
What is a Nor'easter?
Nor'easters can occur in the eastern United States any time between October and April, when moisture and cold air are plentiful. They are known for dumping heavy amounts of rain and snow, producing hurricane-force winds, and creating high surfs that cause severe beach erosion and coastal flooding. A Nor'easter is named for the winds that blow in from the northeast and drive the storm up the east coast along the Gulf Stream, a band of warm water that lies off the Atlantic coast.
There are two main components to a Nor'easter:
* Gulf Stream low-pressure system - (counter-clockwise winds) These systems generate off the coast of Florida. The air above the Gulf Stream warms and spawns a low-pressure system. This low circulates off the southeastern U.S. coast, gathering warm air and moisture from the Atlantic. Strong northeasterly winds at the leading edge of the storm pull it up the east coast.
* Arctic high-pressure system - (clockwise winds) As the strong northeasterly winds pull the storm up the east coast, it meets with cold, Arctic air blowing down from Canada. When the two systems collide, the moisture and cold air produce a mix of precipitation.
Winter conditions make Nor'easters a normal occurrence, but only a handful actually gather the force and power to cause problems inland. The resulting precipitation depends on how close you are to the converging point of the two storms.
A powerful Nor'easter can bring travel to a standstill, closing city streets and making it nearly impossible to get anywhere for days. The thing to remember with Nor'easters is that the storm systems occur frequently, but only a few of them are powerful enough to make it into the news. There are two types of Nor'easters:
* Offshore forming - These are the storms you hear about in the news. It is a news-worthy storm that moves east of east-coast cities, dumping lots of heavy snow. In an offshore-forming storm, the hardest hit metropolitan areas are likely to be Washington D.C, Philadelphia, New York City and Boston. Eventually, the system moves far enough north that the Canadian jet stream pushes it off the coast.
* Onshore forming - These storms are less exciting than the offshore-forming storms. They move west of east-coast cities, with gusting winds and mostly rain.
http://science.howstuffworks.com/question595.htm