Prognostic Meteorological Discussion
Issued by NWS

Current Version | Previous Version | Text Only | Print | Product List | Glossary Off
Versions: 1 2 3 4

000
FXUS01 KWBC 200750
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
250 AM EST SAT DEC 20 2014

VALID 12Z SAT DEC 20 2014 - 12Z MON DEC 22 2014

***HEAVY RAIN AND MOUNTAIN SNOW FOR THE NORTHWEST U.S.***

***RAIN AND A FEW THUNDERSTORMS FOR THE GULF COAST REGION***

***PLEASANT WEATHER FOR DESERT SOUTHWEST AND TEXAS***

STRONG DEEP-LAYER FLOW FROM THE PACIFIC WILL KEEP THE WEATHER
PATTERN ACTIVE FROM THE PACIFIC NORTHWEST TO THE CENTRAL AND
NORTHERN ROCKIES THROUGH THE WEEKEND.  A COUPLE OF STRONG
DISTURBANCES IN THIS FAST FLOW WILL PIVOT AROUND A DEEP LOW
PRESSURE SYSTEM OVER THE GULF OF ALASKA.  THESE DISTURBANCES,
ALONG WITH THEIR SURFACE COLD FRONTS, ARE FORECAST TO BRING HEAVY
RAIN FOR THE COASTAL AREAS OF THE PACIFIC NORTHWEST, WITH SOME
AMOUNTS IN EXCESS OF 4 INCHES POSSIBLE BY SUNDAY MORNING.  VERY
HEAVY SNOW IN THE HIGHER MOUNTAIN RANGES COULD REACH 1 TO 3 FEET
WITH COPIOUS MOISTURE BEING FORCED UP THE TOPOGRAPHY.

FOR THE DEEP SOUTH AND GULF COAST REGION, A WAVE OF LOW PRESSURE
DEVELOPING ALONG A FRONTAL BOUNDARY OVER THE NORTHERN GULF OF
MEXICO WILL KEEP THE WEATHER UNSETTLED FOR MUCH OF THE WEEKEND.
BASED ON THE LATEST FORECASTS, IT APPEARS THAT THE MID-ATLANTIC
REGION AND THE NORTHEAST U.S. SHOULD AVOID SEEING ANY SIGNIFICANT
PRECIPITATION FROM THIS SYSTEM SINCE IT WILL REMAIN ON A MORE
SOUTHERN TRACK.  DRY AND PLEASANT WEATHER CAN BE EXPECTED FROM
SOUTHERN CALIFORNIA TO TEXAS.

HAMRICK


GRAPHICS AVAILABLE AT WWW.WPC.NCEP.NOAA.GOV
$$





USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.