Prognostic Meteorological Discussion
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996
FXUS01 KWBC 170744
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
244 AM EST SUN DEC 17 2017

VALID 12Z SUN DEC 17 2017 - 12Z TUE DEC 19 2017

...SNOW FOR THE ROCKIES AND RAIN FOR THE GULF COAST...

A STRONG UPPER-LEVEL TROUGH IS BREAKING DOWN THE RIDGE ACROSS THE
WEST AND THIS IS CAUSING THE EASTERN U.S. TROUGH TO BECOME LESS
AMPLIFIED WITH MORE WEST-TO-EAST FLOW ALOFT.  HEAVY SNOW IS
EXPECTED FOR WASHINGTON STATE AND FOR THE NORTHERN ROCKIES
COURTESY OF PACIFIC MOISTURE WORKING ITS WAY INLAND.  SOME SNOW IS
ALSO EXPECTED FOR PARTS OF EASTERN ARIZONA AND WESTERN NEW MEXICO
WITH A SURFACE LOW SETTLING SOUTHWARD ACROSS THAT REGION.

DEEPER MOISTURE RETURNING NORTHWARD FROM THE GULF OF MEXICO IS
EXPECTED TO FUEL THE DEVELOPMENT OF SCATTERED TO NUMEROUS SHOWERS
AND THUNDERSTORMS, ALONG WITH LOCALLY HEAVY RAINFALL AT TIMES.
THE REGION THAT WILL LIKELY GET THE HEAVIEST RAIN WOULD BE FROM
EASTERN TEXAS TO THE CENTRAL GULF COAST REGION, WITH DAILY AREAL
AVERAGES OF 1 TO LOCALLY 2 INCHES FORECAST THROUGH MONDAY NIGHT.
THERE MAY BE A FEW INSTANCES OF FLOODING WHERE AREAS OF
THUNDERSTORM ACTIVITY PERSISTS.

WARM AND DRY CONDITIONS ARE EXPECTED FOR FLORIDA AND THE LOWER
ELEVATIONS OF CALIFORNIA GOING INTO THE EARLY PART OF THE WORK
WEEK.  FIRE WEATHER CONCERNS WILL STILL EXIST ACROSS PARTS OF
CALIFORNIA ON SUNDAY OWING TO THE DRY CONDITIONS AND GUSTY WINDS.

D. HAMRICK


GRAPHICS AVAILABLE AT
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP
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