Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
249 AM EST Sat Nov 25 2017
Valid 12Z Sat Nov 25 2017 - 12Z Mon Nov 27 2017
...Heavy precipitation for the Pacific Northwest and Northern California
...Well-above normal temperatures across the western and central U.S.
through the weekend...
Widespread precipitation will spread across the Pacific Northwest, south
into northern California and east into portions of the Northern Rockies as
a low pressure system approaches the West Coast. The coastal areas will
likely have periods of higher rainfall rates, which may result in locally
heavy rain. Snow is expected to mix in at the higher elevations, with
accumulations of 4 to 8 inches possible for portions of the Cascades and
Sierras on Sunday. As snow amounts decrease of the Pacific Northwest and
California by late Sunday, accumulations are forecast to increase over
southwest Montana/northwest Wyoming on Monday.
With a ridge of high pressure anchored over the West, much of the
southwest and south-central states will run warmer than seasonal average
for late November. Several locations today in the Southwest will have
highs running upwards of 20 degrees warmer; which may tie or set a new
daily record. Temperatures 20 degrees above normal will spread to the
Rockies, Northern and Central Plains by Sunday, with more possibilities
for record highs and record high minimum temperatures. For the East,
temperatures are expected to be 5 to 10 degrees above average today before
falling to below average on Sunday after the cold front sweeps through.
This system will bring light rain and snow to the Great Lakes region,
northern Mid-Atlantic and the Northeast.
Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php