Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
459 AM EDT Thu May 23 2013

Valid 12Z Thu May 23 2013 - 12Z Sat May 25 2013


...Slow-moving cold front will focus showers and thunderstorms for the
East coast...

...Cold and wet continues in the Pacific Northwest and northern Rockies
with widespread freeze watches and warnings in effect...

Warm and humid conditions in the East will give way to scattered showers
and thunderstorms Thursday and Thursday night. Some storms may become
severe over portions of the northern Mid-Atlantic states. The weather
turns cooler behind the front...with high temperatures on Friday falling
back 15-25 degrees from highs on Thursday.   

A deep trough of low pressure in the Northwest will continue to produce
well below normal temperatures...showers and a few thunderstorms in the
Rockies. Unusually low snow levels and snowfall accumulations have already
been observed over interior sections of Washington and along the
Continental Divide. The potential for brief periods of snow and snow
showers remains a possibility through Friday night. 

For the Great Lakes and Midwest...cold high pressure will prevail in the
the early part of the holiday weekend. Scattered light frosts are possible
across the Upper Midwest and near the lakes...and high temperatures will
likely be a good 10-15 degrees below normal for late May.

Vojtesak

Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php