Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
429 AM EDT Sun Apr 23 2017
Valid 12Z Sun Apr 23 2017 - 12Z Tue Apr 25 2017
...Heavy rain possible over parts of the Southern Mid-Atlantic and the
...Heavy rain possible over parts of the Pacific Northwest...
...Snow for the Northern Rockies and Cascades...
Low pressure over the Tennessee Valley and parts of the Southeast will
deepen as the storm moves eastward to the Southeast Coast by Monday
evening. The system will produce showers and thunderstorms from parts of
the Southern Mid-Atlantic to the Tennessee Valley and southward to the
Central Gulf Coast that will move to the Southeast Coast by Monday
evening. Rain will also develop over parts of the Ohio Valley to the
Northern Mid-Atlantic Coast on Sunday evening that will, likewise, move to
the Northern Mid-Atlantic Coast by Monday evening.
Upper-level dynamics will then surge eastward across the northern Rockies
and interact with a cold front across the northern Plains, where a new low
pressure system is expected to develop on Monday. Temperatures will be
cold enough to support wintry precipitation near the U.S.-Canadian border
from the northern Plains eastward into the upper Great Lakes on Monday.
Meanwhile, much below normal temperatures from the central and southern
Plains into the Midwest this weekend will be replaced by much warmer
temperatures by Monday afternoon ahead of the developing low pressure
system in the northern Plains. Farther to the east, a low pressure wave
developing along a frontal boundary is bringing rain across the
mid-Atlantic and showers and thunderstorms into the Deep South. This
system is forecast to gradually deepen as moisture associated with a weak
tropical low moving up from Florida begins to interact with the associated
upper-level trough. This will keep wet weather in place across the
southeastern U.S. as well as Florida for the rest of the weekend. The
rain should begin to head northward up the East Coast on Monday as the low
pressure system centered near the southeast U.S. coast deepens.
Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php