This NOAA satellite image taken Wednesday, June 1, 2011 at 10:45 AM EDT shows a broad patch of comma shaped cloud cover over eastern Canada highlighting a low pressure system moving through the ... more 
This NOAA satellite image taken Wednesday, June 1, 2011 at 10:45 AM EDT shows a broad patch of comma shaped cloud cover over eastern Canada highlighting a low pressure system moving through the region. An associated cold front extends southwestward from this low, reaching through the Lower Great Lakes down into the Central Appalachians. Showers and thunderstorms develop ahead of this cold front, from parts of Vermont and New York through Pennsylvania and Virginia. Strong daytime heating and increased southwesterly winds ahead of this cold front create favorable conditions for severe weather development during this afternoon. There is a slight risk of severe thunderstorm development over much of the Mid-Atlantic and the Northeast. While the main threats with storms in these regions will be damaging wind and hail, a few tornadoes can\'t be ruled out. Meanwhile, low pressure in the Central High Plains and a warm front lifting through the Central Plains return moisture to the region today. The Central and Southern High Plains are at slight risk of severe weather development today with large hail, damaging wind, and possibly tornadoes. Elsewhere, hot weather continues over areas from the southern Southwest through the northern Mid-Atlantic. Strong daytime heating creates another day of Excessive Heat Warnings in the Delaware Valley. Finally, a small area of low pressure located just to the east of Daytona Beach Florida. Showers and thunderstorms spread over portions of northern and central Florida as this low is moves southwestward near 20 mph. Significant development of this system is not anticipated while it moves over land today and tonight. less 
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Associated Press | Photo By Weather Underground
Wed, Jun 1, 2011 2:40 PM EDT