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Monday 10 a.m.
The Northeast is having a break from wintry cold and snow early this week. As a storm moves northeastward to eastern Canada, its associated cold front will spread rain to the I95 corridor tomorrow, then usher in the return of chilly weather. Snow showers will break out downwind from the Great Lakes and into the Appalachians, but the new chilly regime will be dry in the major East Coast cities. The map shows the pressure pattern in the Northeast and Great Lakes at 9 a.m. EDT today. You can see the fronts where the isobars bend sharply. Line 1 in the primary cold front. The wind is southerly ahead of it and becomes westerly as the front goes by. The arrows in the southerly flow are red to denote relative warmth. The light blue arrows show the direction cooler air is moving. Line 2 looks like a secondary cold front. The blue arrows denote the flow of cold air behind the second front.
Now, today's video for the Northeast:
Looking ahead to next week, the main U.S. computer model (GFS) shows a large storm forming in the Atlantic well east of New England. This would mean chilly but dry weather for a while in the Northeast (until the storm moves far enough away to allow the next high pressure area to take over. Another storm is shown to develop over the Rockies and appears poised to move toward the Great Lakes. Such a storm would eventually bring milder air back into the East (as the high moves offshore).
The European Model (ECMWF) looks quite a bit different. It also brings chilly air into the Northeast early next week, but then it shows a storm developing over the southern Plains and moving toward the Middle Atlantic coast. Such a storm could easily bring substantial snow to its north. We'll track these possibilities during the next week.
This video focuses on Illinois, Wisconsin and Michigan.
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