Prognostic Meteorological Discussion
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FXUS01 KWBC 041934
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
233 PM EST SUN DEC 04 2016

VALID 00Z MON DEC 05 2016 - 00Z WED DEC 07 2016

...FLASH FLOODING POSSIBLE ACROSS PORTIONS OF THE GULF COAST AND
SOUTHEAST THROUGH MONDAY NIGHT...

...HEAVY SNOW POSSIBLE FOR PORTIONS OF THE CASCADES AND THE
NORTHERN ROCKIES...

...COLD TEMPERATURES ON THE WAY FOR PORTIONS OF THE NORTHERN
ROCKIES AND NORTHERN PLAINS BY TUESDAY...

A FRONTAL BOUNDARY WITH MULTIPLE WAVES OF LOW PRESSURE ALONG IT
WILL CONTINUE TO BRING RAIN AND THUNDERSTORMS TO THE GULF COAST
AND SOUTHEASTERN STATES TONIGHT THROUGH MONDAY NIGHT. ALONG THE
NORTHERN EDGE OF THE SYSTEM, AREAS OF SNOW AND SLEET ARE POSSIBLE
TONIGHT AND MONDAY FROM THE GREAT LAKES TO THE NORTHEAST. A
STRONGER AREA OF LOW PRESSURE IS FORECAST TO DEVELOP IN THE
NORTHERN GULF OF MEXICO LATE MONDAY, SPREADING ANOTHER ROUND OF
PRECIPITATION INLAND ACROSS THE GULF COAST AND SOUTHEAST. HEAVY
RAIN MAY LEAD TO AREAS OF FLASH FLOODING ACROSS PORTIONS OF THE
GULF COAST AND SOUTHEAST THROUGH MONDAY NIGHT. ON TUESDAY, THE LOW
PRESSURE SYSTEM WILL MOVE NORTH INTO THE TENNESSEE AND OHIO
VALLEYS, WHILE A NEW AREA OF LOW PRESSURE DEVELOPS ALONG THE COAST
OF THE CAROLINAS, ONCE AGAIN SPREADING PRECIPITATION INTO THE
MID-ATLANTIC AND NORTHEAST, SOME OF WHICH COULD FALL AS A SNOW OR
SLEET, ESPECIALLY AT INLAND AREAS WELL ABOVE SEA-LEVEL.

UNSETTLED CONDITIONS WILL PREVAIL THROUGH THE SHORT RANGE FROM THE
PACIFIC NORTHWEST TO THE NORTHERN ROCKIES. ONE FRONTAL SYSTEM WILL
BRING AREAS OF SNOW AND VALLEY RAIN TO PORTIONS OF THE NORTHERN
INTERMOUNTAIN WEST AND NORTHERN ROCKIES TONIGHT INTO MONDAY. HEAVY
SNOW IS POSSIBLE ACROSS THE NORTHERN ROCKIES. THIS SYSTEM WILL
MOVE INTO THE NORTHERN PLAINS AND UPPER MIDWEST BY MONDAY
AFTERNOON, BRINGING AREAS OF RAIN AND SNOW TO THOSE REGIONS.
BEHIND THIS SYSTEM, AN ARCTIC COLD FRONT WILL SWEEP SOUTH INTO THE
NORTHERN ROCKIES AND NORTHERN PLAIN, BRINGING WELL BELOW AVERAGE
TEMPERATURES BY MONDAY NIGHT AND TUESDAY. HIGH TEMPERATURES ON
TUESDAY ACROSS THESE AREAS ARE FORECAST TO BE 20 TO 35 DEGREES
BELOW AVERAGE. ADDITIONALLY, THE PACIFIC NORTHWEST WILL SEE THE
PERIODS OF PRECIPITATION OVER THE NEXT COUPLE DAYS. RAIN AND
MOUNTAIN SNOW WILL PICK UP IN INTENSITY TONIGHT AS A PACIFIC
FRONTAL SYSTEM MOVES INLAND. SNOW MAY BE HEAVY ACROSS THE CASCADES
TONIGHT THROUGH MONDAY. ADDITIONALLY, SNOW LEVELS WILL LOWER
SUBSTANTIALLY BY MONDAY, WITH A MIX OF RAIN AND SNOW POSSIBLE EVEN
AT THE LOWER ELEVATIONS AROUND PUGET SOUND.

RYAN


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