Tuesday, September 21, 2010

Summer storm threat returns

Noon Update:  With the filtered sunshine we have so far for this morning/early afternoon....the atmosphere is beginning to destabilize some ahead of a cold front that currently stretches through northern Wisconsin and back through northeast Iowa.  The line has been fairly slow to move so far this morning but is expected to gain a little more speed as an upper level disturbance rotates through.  Southern Iowa/Northeast Missouri will be the place to watch later this afternoon for any storm development.  With any of the storms that move through, very gusty winds would likely be the main threat. 


8:00am Update: The Storm Prediction Center continues the slight risk for this afternoon as a thin line of showers and embedded storms form along a cold front.  We've got a thin cirrus overcast across much of the Stateline this morning which actually may not allow our atmosphere to destabilize as much as if we had full sunshine.  Of course if we get a couple hours of sun later today that may change things.  As the front moves through later this afternoon an upper level disturbance is forecast to move through around the same time.  This will likely help storms initiate and move east/northeast overnight.  The biggest threat would be gusty winds later this evening.  We'll be watching for development along the southern edge of the front in southern Iowa as storm motion would likely move southwest to northeast.  Be sure to check back later this morning as we'll try to get an update for you around noon.

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