Prognostic Meteorological Discussion
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465
FXUS01 KWBC 201928
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
227 PM EST MON FEB 20 2017

VALID 00Z TUE FEB 21 2017 - 00Z THU FEB 23 2017

...HEAVY RAIN AND MOUNTAIN SNOW POSSIBLE INTO TUESDAY ACROSS
PORTIONS OF THE WESTERN U.S...

...HEAVY RAIN POSSIBLE INTO TUESDAY ACROSS PORTIONS OF THE CENTRAL
GULF COAST...

...RECORD HIGH TEMPERATURES POSSIBLE THROUGH MIDWEEK ACROSS
PORTIONS OF THE CENTRAL AND EASTERN U.S...

A PLUME OF PACIFIC MOISTURE AND A VIGOROUS LOW PRESSURE SYSTEM
WILL CONTINUE TO BRING WIDESPREAD RAIN AND MOUNTAIN SNOW TO
PORTIONS OF CALIFORNIA, THE PACIFIC NORTHWEST, AND THE NORTHERN
GREAT BASIN TONIGHT AND INTO MUCH OF TUESDAY. HEAVY RAIN MAY
RESULT IN FLOODING FOR SOME AREAS, AND HEAVY SNOW WILL BE POSSIBLE
AT HIGH ELEVATION LOCATIONS. THE LOW PRESSURE SYSTEM IS EXPECTED
TO MOVE REACH THE PACIFIC NORTHWEST COASTLINE EARLY TUESDAY
MORNING, AND THEN MOVE INLAND DURING THE DAY. PRECIPITATION SHOULD
BEGIN TO DECREASE IN COVERAGE AND INTENSITY FOR SOME AREAS ALONG
THE WEST COAST LATER TUESDAY AS THE SYSTEM MOVES INLAND. THE
SYSTEM WILL ALSO BRING POTENTIALLY HEAVY SNOW TO PORTIONS OF THE
NORTHERN ROCKIES TONIGHT THROUGH TUESDAY. ON WEDNESDAY, AS THE
AREA OF LOW PRESSURE MOVES EAST, SNOW WILL BE POSSIBLE FOR
PORTIONS OF NEVADA AND UTAH AS WELL.

FARTHER EAST, A SLOW-MOVING UPPER-LEVEL LOW AND SURFACE FRONTAL
SYSTEM WILL BRING SHOWERS AND THUNDERSTORMS FROM THE CENTRAL GULF
COAST TO THE GREAT LAKES TONIGHT AND TUESDAY MORNING. STORMS COULD
PRODUCE HEAVY RAINFALL ACROSS THE CENTRAL GULF COAST. THE NORTHERN
END OF THE SYSTEM WILL SPREAD A MIX OF SCATTERED LIGHT RAIN,
FREEZING RAIN, AND SNOW INTO PORTIONS OF THE NORTHEAST LATE
TUESDAY AS WELL.

THE OTHER MAJOR WEATHER STORY THROUGH MIDWEEK WILL BE THE RECORD
WARMTH ACROSS LARGE AREAS OF THE CENTRAL AND EASTERN U.S. A BROAD
AREA OF HIGH PRESSURE AT THE MID AND UPPER LEVELS OF THE
ATMOSPHERE WILL SUPPORT WELL ABOVE AVERAGE TEMPERATURES FOR MANY
AREAS. HIGH TEMPERATURES ON TUESDAY ARE FORECAST TO BE 20 TO 40
DEGREES ABOVE AVERAGE FROM THE CENTRAL AND NORTHERN PLAINS TO THE
GREAT LAKES, WITH MANY AREAS REACHING WELL INTO THE 70S. ON
WEDNESDAY THESE TEMPERATURES WILL EXPAND EASTWARD WITH HIGH
TEMPERATURES EXCEEDING 20 DEGREES ABOVE AVERAGE OVER PORTIONS OF
THE MID-ATLANTIC REGION. RECORD HIGH TEMPERATURES ARE POSSIBLE
ACROSS THESE AREAS THROUGH WEDNESDAY.


RYAN


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





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