Prognostic Meteorological Discussion
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950
FXUS01 KWBC 241841
PMDSPD

Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
241 PM EDT Tue Apr 24 2018

Valid 00Z Wed Apr 25 2018 - 00Z Fri Apr 27 2018

...Heavy rain possible over Mid-Atlantic and New England States...
...Record high temperatures possible across the West today and
tomorrow...

A deep layer cyclone will move northeast up the Northern
Mid-Atlantic and New England coasts over the next couple of days.
The system will produce showers and thunderstorms within its warm
conveyor belt to the east and northeast of the surface low.
Generally heavy rain of 1-2 inches, with locally higher amounts,
is expected from northern Virginia northeast through Maine through
Thursday with a marginal risk of excessive rainfall anticipated.

An upper level disturbance over the Northern Rockies will move
southeastward to the Central/Southern Plains by Wednesday evening,
driving a weak cold front forward.  Light snow over parts of the
Northern/Central Rockies and the Northern/Central High Plains is
expected to fade tonight.  Rain will develop over parts of the
Northern/Central Plains that will ends by Wednesday morning.  Rain
then advances into the Middle/Lower Mississippi Valley on
Wednesday.  Within areas of greater instability, showers and
thunderstorms will develop along and ahead of the associated front
over parts of the Southern High Plains today and tonight, moving
southeast into the Southern Plains Wednesday then streaking
through the Gulf Coast and Southeast Wednesday night and Thursday.
 Another cold front over Western Canada will sink southward into
the Northern High Plains/Northern Rockies on Wednesday and
Thursday which will produce areas of light rain over parts of the
region by Wednesday evening with thunderstorms across the southern
Plains expected Thursday.

Out West, a strong packet of energy aloft moves towards the
region, sparking showers and thunderstorms across Oregon,
northeast California, and northwest Nevada Thursday afternoon and
evening.  For the rest of the area, dry conditions are expected
under a dome of high pressure aloft.  Record high temperatures are
possible Tuesday and Wednesday across the Pacific Northwest and
Desert Southwest.

Roth


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





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