Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
400 PM EDT Sat Apr 22 2017
Valid 00Z Sun Apr 23 2017 - 00Z Tue Apr 25 2017
...A developing low pressure system together with tropical moisture will
keep wet weather over the Southeast through early next week...
...Persistent onshore flow will keep cool and unsettled weather in the
The upper-level pattern over the next few days will feature a fast onshore
flow with multiple disturbances moving through the western U.S. while a
trough is forecast to deepen near the Southeast U.S. coast. This will
continue the cool and unsettled weather across the northwestern U.S.
through the weekend, with rain/snow in the lower/higher elevations. By
Monday, another Pacific cyclone is forecast to move onshore. This will
invigorate a new round of precipitation from northern California northward
through the Pacific Northwest, which will spread further inland on Monday.
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