Prognostic Meteorological Discussion
Issued by NWS

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3
000
FXUS01 KWBC 051920
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
219 PM EST MON DEC 05 2016

VALID 00Z TUE DEC 06 2016 - 00Z THU DEC 08 2016

...SEVERE THUNDERSTORMS AND HEAVY RAIN POSSIBLE FOR PORTIONS OF
THE SOUTHEAST AND LOWER MISSISSIPPI VALLEY...

...HEAVY SNOW POSSIBLE FOR PORTIONS OF THE NORTHERN PLAINS AND
UPPER MIDWEST, AS WELL AS THE PACIFIC NORTHWEST...

...COLD AIR EXPECTED TO SPREAD ACROSS MUCH OF THE ROCKIES AND THE
GREAT PLAINS...

A STRENGTHENING LOW PRESSURE SYSTEM IN THE NORTHERN GULF OF MEXICO
WILL CONTINUE TO SPREAD RAIN AND THUNDERSTORMS ACROSS MUCH OF THE
SOUTHEAST AND LOWER MISSISSIPPI VALLEY THROUGH TONIGHT. SOME AREAS
FROM THE LOWER MISSISSIPPI VALLEY TO THE SOUTHEAST COULD SEE A
THREAT OF SEVERE THUNDERSTORMS AS WELL AS HEAVY RAIN/FLASH
FLOODING. AS THE SURFACE LOW MOVES NORTHEASTWARD TO THE TENNESSEE
VALLEY ON TUESDAY, PRECIPITATION WILL SPREAD FARTHER NORTH INTO
THE OHIO VALLEY, MID-ATLANTIC, AND THE NORTHEAST. COLD AIR IN
PLACE ON THE NORTHERN PERIPHERY OF THE SYSTEM WILL ALLOW SOME
PRECIPITATION TO FALL AS A MIX OF RAIN, SLEET, AND SNOW FROM THE
NORTHERN MID-ATLANTIC REGION INTO THE NORTHEAST. RAIN WILL BEGIN
TO COME TO AN END ACROSS THE SOUTHEAST BY TUESDAY AFTERNOON, BUT
AREAS OF RAIN AND SNOW WILL PERSIST ACROSS THE NORTHEAST INTO
WEDNESDAY MORNING AS THE LOW PRESSURE SYSTEM MOVES OUT INTO THE
OPEN ATLANTIC OCEAN.

AN AREA OF LOW PRESSURE IS FORECAST TO CONTINUE DEEPENING ACROSS
THE UPPER MIDWEST THIS EVENING. THE SYSTEM WILL BRING SNOW TO
AREAS FROM THE NORTHERN PLAINS INTO THE UPPER MIDWEST THROUGH
TONIGHT AND INTO TUESDAY. HEAVY SNOW SNOW ALONG WITH GUSTY WINDS
ARE POSSIBLE FOR SOME AREAS, RESULTING IN THE POTENTIAL FOR SOME
BLOWING AND DRIFTING SNOW. SNOW WILL BEGIN TO TAPER OFF BY TUESDAY
AFTERNOON AS THE LOW PRESSURE SYSTEM MOVES NORTHEAST INTO ONTARIO,
HOWEVER SCATTERED SNOW SHOWERS WILL PERSIST INTO WEDNESDAY.

ONSHORE FLOW WILL CONTINUE TO SPREAD MOISTURE AND PRECIPITATION
INTO THE PACIFIC NORTHWEST THROUGH TONIGHT. COLD AIR IN PLACE
ACROSS THE REGION WILL ALLOW PRECIPITATION TO FALL AS SNOW EVEN IN
VALLEYS, WITH SOME ACCUMULATIONS POSSIBLE. ACROSS THE HIGHER
TERRAIN OF SOUTHEASTERN OREGON, INCLUDING THE SOUTHERN CASCADES
AND COASTAL RANGE, HEAVY SNOW IS POSSIBLE.

AN ARCTIC COLD FRONT WILL SPREAD A FRIGID AIR MASS SOUTHWARD INTO
THE ROCKIES AND MUCH OF THE PLAINS THROUGH MIDWEEK. AFTERNOON
HIGHS ON TUESDAY ARE FORECAST TO BE 20 TO 30 DEGREES BELOW AVERAGE
FROM THE NORTHERN ROCKIES INTO THE NORTHERN HIGH PLAINS. ON
WEDNESDAY THESE COLD TEMPERATURES WILL SPREAD SOUTH INTO THE
CENTRAL ROCKIES AND THE CENTRAL PLAINS.


RYAN


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





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