Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
400 PM EDT Sat May 27 2017
Valid 00Z Sun May 28 2017 - 00Z Tue May 30 2017
...Showers and thunderstorms will gradually shift from the mid-section of
the country to the East Coast and the Deep South through Memorial Day...
...Very warm weather expected to develop over the Pacific Northwest while
cool weather persists from the Great Plains eastward to New England...
This Memorial Day weekend will feature a broad upper-level trough
dominating much of the eastern two-thirds of the country. This will
result in cooler than normal temperatures from the Plains eastward to New
England through Memorial Day. The leading edge of the cool air will
slowly edge towards the south and east. Showers and thunderstorms
associated with the frontal boundary will gradually shift from the central
U.S. this afternoon and evening, and spread into the Deep South and much
of the East Coast by Memorial Day. The front is expected to become
stationary across the mid-Atlantic. This will keep the warm and humid air
over the Southeast while overcast and cool weather persists from the
mid-Atlantic northward. As a low pressure center develops and heads
towards the Great Lakes, showers and thunderstorms will spread across the
Ohio Valley on Sunday before reaching the mid-Atlantic, followed by New
England on Memorial Day. Meanwhile, showers and thunderstorms near the
tail end of the front could be heavy enough to lead to flash flooding over
southern Texas on Memorial Day.
A lingering broad upper-level low centered north of the Great Lakes will
continue to send periodic intrusions of cool air from central Canada down
into the Plains, keeping temperatures there cooler than normal through
Memorial Day. In contrast, warm and dry conditions are expected to
develop over the Pacific Northwest. High temperatures are forecast to
reach the lower 90s on Sunday, which are 10 to 20 degrees above average.
The warm weather is expected to spread farther south and east into the
Great Basin on Memorial Day.
Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php