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