U.S. National Radar

Comet Ison Viewing Guide

Wednesday, October 20, 2010

Weather synopsis: October 20, 2010


10:47pm batten down the hatches, it is breezy out there to say the least. Winds will continue to howl through Thursday in excess of 40 miles per hour. In addition to the wind we will have to contend with precipitation over the lower Great Lakes. A Low Pressure System over the northern Great Lakes and southern Canada is working its way towards the east. This system will introduce a cold front in to the region. Rain will likely break out tonight across the lower Great Lakes and persist through the Thursday. Depending on the timing of the cold air and the duration of the precipitation, there is a possibility for the air temperatures in the upper atmosphere to be just cold enough to support a Rain and Snow mixture at the surface from Thursday afternoon through early Friday morning so don't be surprised if you notice some snow falling tomorrow evening. What ever snow that does fall if any will be brief and should not accumulate. Nevertheless conditions will be hazardous, it would be advisable to give your self extra time when heading out. Rain will also develop towards the Northeast coast as the cold front progresses east towards the Atlantic. Here the precipitation will more than likely remain all rain. Temperatures tomorrow will be tumbling as the cold front will usher in a brisk air mass. Initially high temperatures across the lower Great Lakes will range in the 50s and 60's along the coast. Then as the cold front passes temperatures will begin to drop in to the 30s and 40s.

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