File:NWS Surface map 1998-01-06.gif

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English: Surface weather map of Januray 6th, 1998, caracteristic of the atmospheric circulation during the 5 days of the North American ice storm of 1998. There is a strong arctic high pressure system located across north central Canada migrating toward Quebec and Labrador. At the same time, a low pressure is quasi-stationnary over lake Erie and Ontario with a stationnary warm front toward New England. This create a strong pressure gradient between those two systems. This stronger gradient and clockwise flow around high pressure accounted for a strengthening flow of cold, dense air from northeast Quebec southwest down the St. Lawrence River Valley of Quebec into the St. Lawrence River and northern Champlain Valleys in New York and Vermont. At the same time, the flow was from the south, south of the warm front.
Français : Carte météorologique de surface du 6 janvier 1998. Elle est caractériques de la circulation durant les 5 jours du Verglas massif de 1998. On peut voir un anticyclone recouvrant le nord du Québec, de l'Ontario et le Labrador. En même temps, une dépression est quasi-stationnaire sur les lacs Ontario et Érié avec un front chaud stationnaire vers la Nouvelle-Angleterre. Le gradient de pression entre ces deux systèmes s'est renforcé graduellement augmentant la circulation d'air du nord-est en surface, de l'anticyclone vers la dépression, dans la vallée du Saint-Laurent pendant que le vents était du sud au sud du front chaud.
Date January 1998 but in a web site created in January 2008
Source http://www.erh.noaa.gov/btv/events/IceStorm1998/ice98.shtml
Author National Weather Service Office in Burlington, Vermont

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Public domain
This image is in the public domain because it contains materials that originally came from the U.S. National Oceanic and Atmospheric Administration, taken or made as part of an employee's official duties.

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current18:32, 12 June 2009Thumbnail for version as of 18:32, 12 June 20091,247 × 818 (691 KB)Pierre cb (talk | contribs){{Information |Description={{en|1=Surface weather map of Januray 6th, 1998, caracteristic of the atmospheric circulation during the 5 days of the North American ice storm of 1998. There is a strong arctic high pres

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