Prognostic Meteorological Discussion
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000
FXUS01 KWBC 231908
PMDSPD

Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
307 PM EDT Mon Apr 23 2018

Valid 00Z Tue Apr 24 2018 - 00Z Thu Apr 26 2018

...Unsettled weather is expected across the central Appalachians,
Mid-Atlantic, the Northeast for Tuesday and Wednesday with areas
of locally heavy rainfall...

...Some snow is possible over parts of the northern Rockies and
northern High Plains...

...Mild and dry weather is expected for the Intermountain West...

A storm system currently over the Tennessee Valley will slowly
move eastward across the Southeast overnight and then northeast up
across the Mid-Atlantic region through Tuesday, and then over the
Northeast by the middle of the week. This will result in a couple
of days of unsettled weather with areas of locally heavy rainfall
and temperatures that will generally be below normal. The heaviest
rainfall should tend to be focused across some of the east-facing
slopes of the central Appalachians and over the Mid-Atlantic
coastal plain where a couple inches of rain can be expected. The
rains will be heavy enough that there will be at least some
localized concerns for flooding. The storm system will spread
widespread rainfall well inland across the interior of the
Northeast Tuesday night and through Wednesday as low pressure
lifts up along the East Coast. Farther south, a trailing cold
front will cross the Florida Peninsula and this will bring some
scattered showers and thunderstorms to this area as the front
gradually crosses.

Meanwhile, farther off to the west, some upper-level energy over
the northern Rockies will advance southeastward across the central
Plains and central Rockies by Tuesday evening. Sufficient moisture
and forcing will be in place for some higher elevation snow and
lower elevation rain for areas of the northern Rockies and
northern High Plains. This will include the potential for some
accumulating snow across areas of the Black Hills. A cold front
will be accompanying this energy aloft as it digs down across the
Plains and this should lead the way for some much colder
temperatures to drop south through the middle of the week. As the
front settles south, there will be rain that also focuses farther
south down toward the southern Plains and even the lower
Mississippi Valley through Wednesday.

The Western U.S. should see rather tranquil weather through the
middle of the week with dry conditions and mild temperatures.
Overall, daytime temperatures are expected to be as much as 10 to
20 degrees above normal across the Great Basin as high pressure
aloft settles over the region.

Orrison

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





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