File:NWS Upper air map 500mb 1998-01-05.gif
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English: Upper air circulation at 500 mb during the North American ice storm of 1998. On January 5th, a long wave trough of low pressure was across the Rockies while a anti-cyclonic ridge was building across the East coast of the United States and Atlantic Ocean. This combination develops a persistent mild southwest flow the Gulf of Mexico to the northeast United States and southeast Canada where it has to turn to the East. The trough will move gradually East until the 10th but the eastward turn other the affected area will remain zonal.
Français : Circulation atmosphérique à 500 mb (environ 5,5 km d'altitude) durant le Verglas massif de 1998. Le 5 janvier, une onde longue de Rossby sur les montagnes Rocheuses et forme une creux barométrique à ce niveau qui amène de l'air doux du Golfe du Mexique sur le nord-est de l'Amérique du Nord. La circulation tourne vers l'Est à la hauteur du sud du Québec, empêchant cet air d'aller plus au nord. Le creux se déplacera lentement vers l'Est au cours des jours suivants mais pas la circulation zonale sur la zone affectée par le verglas. |
| Date | January 1998 but put into a web page on 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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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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| current | 18:13, 12 June 2009 | | 752 × 662 (315 KB) | Pierre cb (talk | contribs) | {{Information |Description={{en|1=Upper air circulation at 500 mb during the North American ice storm of 1998. On January 5th, a long wave trough of low pressure was across the Rockies while a anti-cyclonic ridge w |
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