Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
348 AM EDT Fri Sep 22 2017
Valid 12Z Fri Sep 22 2017 - 12Z Sun Sep 24 2017
...Cold for the western U.S. and warm for the eastern states...
A dichotomy of air masses will exist across the nation to end the week and
into the weekend, with a deep trough over the Intermountain West and a
large upper level ridge over the eastern U.S. This equates to below
normal temperatures and snow for the higher elevations of the Rockies and
Great Basin, and summer-like heat and noticeable levels of humidity from
the Plains to the East Coast. Some locations across the Ohio Valley and
Midwest could see highs reach 90 or higher, comparable to what was
observed on Thursday.
Given the pronounced difference in these air masses, a strong cold front
will exist from the central Rockies to the northern Plains, with little in
the way of eastward progression over the next couple of days. Strong to
severe thunderstorms are expected to develop along and ahead of the front
on Friday across the western High Plains, and also for parts of the Upper
Midwest. In addition, these storms will be capable of producing episodes
of heavy rain that could result in flash flooding.
Post Tropical Storm Jose will continue to weaken well off New England's
coast through Friday and into the weekend, although it is not expected to
move very much. Rainfall from it would primarily affect coastal portions
of the Northeast U.S., along with elevated surf and hazardous marine
conditions. It will also result in increased cloud cover east of the
Appalachians on Friday.
Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php