Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
343 AM EDT Thu Aug 21 2014
Valid 12Z Thu Aug 21 2014 - 12Z Sat Aug 23 2014
...Slight risk of severe thunderstorms across portions of the Middle
Missouri Valley southeastward across parts of the Great Lakes and the
Western Ohio Valley...
...Heavy rain possible over portions of the Ohio Valley/Central
Appalachians and the Southern Mid-Atlantic...
...Heavy rain possible over portions of Northern Rockies/High Plains...
A persistent boundary extending across parts of the Upper Midwest to the
Ohio Valley and the Mid-Atlantic will have upper-level impulses transiting
the region along with moisture rich air pooling over the area through
Friday. Showers and thunderstorms will develop along and ahead of the
front on Thursday into Friday.
Meanwhile, an upper-level trough roughly over the Northern Rockies will
have embedded disturbances moving through the trough while upslope flow
will aid in producing showers and thunderstorms over parts of the Great
Basin and the Northern Rockies/High Plains as well as parts of the
Northern Plains through Friday. In addition, upper-level energy over
Southern California/Southwest will move northeastward to the
Central/Southern Rockies by Friday evening. Showers and thunderstorms
will develop over parts of the Southwest and expand into parts of the
Great Basin by Thursday evening. The showers and thunderstorms will move
to the Southern/Central Rockies on Friday spilling over into parts of the
Central Plains by Friday evening. Furthermore, general instability and
ample moisture will aid in producing showers and thunderstorms over parts
of Florida through Friday.
Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php