Prognostic Meteorological Discussion
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000
FXUS01 KWBC 181846
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
146 PM EST THU JAN 18 2018

VALID 00Z FRI JAN 19 2018 - 00Z SUN JAN 21 2018

...COLDER TEMPERATURES AND UNSETTLED WEATHER RETURNING TO THE
WEST...

...DRY CONDITIONS AND WARMER TEMPERATURES EXTENDING FROM THE GREAT
PLAINS TO THE EAST...

THE LATTER HALF OF THE WEEK IS EXPECTED TO MARK THE ONSET OF A
PATTERN CHANGE ACROSS THE CONTIGUOUS U.S. -- WITH UNSETTLED
WEATHER AND COLDER TEMPERATURES RETURNING TO THE WESTERN U.S.,
WHILE DRY CONDITIONS AND WARMER TEMPERATURES SPREAD FROM THE
CENTRAL TO THE EASTERN U.S.

IN THE WEST, A WELL-DEFINED COLD FRONT EXTENDING FROM THE NORTHERN
ROCKIES BACK THROUGH NORTHERN CALIFORNIA IS FORECAST TO PUSH
SOUTHEAST DURING THE PERIOD, REACHING THE CENTRAL ROCKIES AND
SOUTHWESTERN U.S. BY THE EARLY PART OF THE WEEKEND.  IN ADDITION
TO COLDER TEMPERATURES, THIS FRONT IS EXPECTED TO BRING WIDESPREAD
PRECIPITATION, INCLUDING MOUNTAIN SNOWS TO THE NORTHERN ROCKIES,
NORTHERN GREAT BASIN AS WELL AS NORTHERN CALIFORNIA THURSDAY NIGHT
INTO FRIDAY.  LATE FRIDAY INTO SATURDAY, PRECIPITATION IS EXPECTED
TO SHIFT FURTHER SOUTHEAST INTO THE FOUR CORNERS REGION, AS WELL
AS THE CENTRAL AND SOUTHERN ROCKIES.  ACROSS THE NORTHWEST, AN
AREA OF LOW PRESSURE LINGERING NORTH OF VANCOUVER ISLAND WILL
CONTINUE TO SUPPORT UNSETTLED WEATHER ACROSS THE THE PACIFIC
NORTHWEST THROUGH FRIDAY.  THIS WILL BE FOLLOWED BY ANOTHER
FRONTAL SYSTEM WHICH WILL APPROACH THE COAST, BRINGING ADDITIONAL
WET WEATHER TO THE REGION ON SATURDAY.

FURTHER EAST, HIGH PRESSURE CURRENTLY CENTERED OVER THE LOWER
MISSISSIPPI VALLEY IS FORECAST TO SHIFT FURTHER EAST -- ALLOWING
WARMER AIR TO SPREAD EAST FROM THE GREAT PLAINS INTO THE EASTERN
U.S.  BY SATURDAY, SEASONAL TO ABOVE AVERAGE TEMPERATURES ARE
EXPECTED TO PREVAIL ACROSS MUCH OF THE EASTERN TWO-THIRDS OF THE
CONTIGUOUS U.S., MARKING A STARK CONTRAST TO TEMPERATURES OBSERVED
EARLIER IN THE WEEK.

PEREIRA

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





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