Prognostic Meteorological Discussion
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FXUS01 KWBC 191953

Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
352 PM EDT Thu Apr 19 2018

Valid 00Z Fri Apr 20 2018 - 00Z Sun Apr 22 2018

...Well below normal temperatures expected across much of the
Eastern U.S. on Friday and into the central states by Saturday...

...Dry and windy conditions will keep fire weather conditions at a
critical to extreme level into the weekend...

The same system which brought significant late season snow
accumulations to portions of the upper Midwest on Wednesday has
now pushed off the east coast, leaving expansive surface high
pressure in it`s wake. This will keep temperatures on the cooler
side for mid-April standard with readings 10 to 20 degrees below
normal across much of the Tennessee/Ohio Valleys and into parts of
the Northeast. Freeze warnings and frost advisories are in effect
overnight Thursday for some of these regions.

A second frontal system pushing across the Four Corners region
this afternoon will continue to allow for accumulating snow in the
highest terrain of mainly the central Rockies. Ahead of the cold
front, numerous showers and thunderstorms will develop across the
southern and central Plains, with locally heavy rainfall possible
on Saturday near the low center as it tracks southeastward towards
northern Texas. This front will also usher in below normal temps
to parts of the southern and central Plains with afternoon highs
10 to 20 degrees below normal possible by Saturday.

Elsewhere, critical to extreme fire weather conditions are
expected to continue across the Four Corners region and into parts
of the southern Rockies and High Plains as low relative humidities
and gusty winds persist on the backside of the frontal system
crossing that region. Red flag warnings and high wind warnings are
in effect across much of the region. And out west, rain and
mountain snows return to portions of the Pacific Northwest by the
weekend as a frontal system pushes onshore.


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