Prognostic Meteorological Discussion
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504
FXUS01 KWBC 130739
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
238 AM EST WED DEC 13 2017

VALID 12Z WED DEC 13 2017 - 12Z FRI DEC 15 2017

...LINGERING FIRE WEATHER CONCERNS FOR SOUTHERN CALIFORNIA...

...MAXIMUM TEMPERATURES 10 TO 20 DEGREES BELOW AVERAGE ALONG THE
EAST COAST WEDNESDAY...

...COLD TO LINGER ACROSS THE NORTHEAST THROUGH THE REST OF THE
WEEK...

WARM AND DRY CONDITIONS ACROSS THE WEST WILL PERSIST THROUGH THE
REMAINDER OF THE WEEK WITH VARYING THREATS IN WILDFIRE CONDITIONS.
WHILE CURRENT WINDS ARE WEAKENED COMPARED TO LATE LAST WEEK, VERY
LOW RELATIVE HUMIDITY VALUES REMAIN ACROSS SOUTHERN CALIFORNIA
WHICH WILL KEEP ELEVATED FIRE WEATHER CONDITIONS IN PLACE TODAY.
AN UPPER LEVEL DISTURBANCE DROPPING SOUTHWARD ON THURSDAY WILL
ALLOW FOR A RE-STRENGTHENING OF HIGH PRESSURE OUT WEST ALONG WITH
GUSTY SANTA ANA WINDS AND CONTINUED LOW RELATIVE HUMIDITY VALUES,
WHICH WILL AGAIN INCREASE THE FIRE WEATHER THREAT FOR THURSDAY IN
SOUTHERN CALIFORNIA.

AFTER THE DEPARTURE OF A COASTAL LOW IMPACTING NEW ENGLAND WITH A
WINTRY MIX EARLY THIS MORNING, COLD AND BREEZY CONDITIONS WILL BE
LEFT IN ITS WAKE, ESPECIALLY ACROSS THE NORTHEAST WHERE HIGHS WILL
STRUGGLE TO GET OUT OF THE TEENS AND 20S FOR LOCATIONS AWAY FROM
THE COAST. IN FACT, MUCH OF THE EAST COAST WILL SEE HIGH
TEMPERATURES TODAY AROUND 10 DEGREES BELOW AVERAGE, WITH NEAR 20
DEGREES BELOW AVERAGE ACROSS PORTIONS OF THE NORTHEAST. LAKE
EFFECT SNOW SHOWERS WILL CONTINUE DOWNWIND OF THE GREAT LAKE
THROUGH FRIDAY BUT THERE WILL BE ENOUGH SHIFTING OF THE WIND
DIRECTION TO PREVENT MUCH IN THE WAY OF HEAVY ACCUMULATIONS.

A QUICK MOVING CLIPPER SYSTEM WILL TRACK THROUGH THE CENTRAL GREAT
LAKES REGION TODAY BRINGING ACCUMULATING SNOW TO PORTIONS OF LOWER
MICHIGAN INTO PORTIONS OF OHIO AND PENNSYLVANIA. ANYWHERE FROM 3
TO 6 INCHES IS EXPECTED FOR THESE LOCATIONS THROUGH THURSDAY
MORNING.

A WEAK SYSTEM IS EXPECTED TO MOVE ACROSS THE CENTRAL PLAINS DURING
THE DAY ON THURSDAY BRINGING LIGHT SNOW SHOWERS, POSSIBLY MIXED
WITH RAIN BUT ANY SNOW ACCUMULATIONS SHOULD BE VERY LIGHT.

OTTO


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