983
FXUS01 KWBC 081916
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
216 PM EST SUN DEC 08 2024
VALID 00Z MON DEC 09 2024 - 00Z WED DEC 11 2024
...HEAVY RAIN THREAT EMERGES ACROSS THE SOUTH LATE SUNDAY INTO
TUESDAY...
...PERIODS OF MIXED RAIN AND SNOW LINGER ACROSS INTERIOR NEW
ENGLAND THROUGH TONIGHT...
...UNSETTLED AND WINDY WEATHER SPREADING ACROSS THE PACIFIC
NORTHWEST THIS WEEKEND WILL REACH INTO THE NORTHERN PLAINS AS
SNOW/WINTRY MIX BY MONDAY...
...WELL ABOVE AVERAGE TEMPERATURES WILL OVERSPREAD THE CENTRAL AND
EASTERN U.S. AS COLD AIR SURGES INTO THE WESTERN U.S....
..STRONG SANTA ANA WINDS RESULT IN CRITICAL FIRE WEATHER DAY
STARTING MONDAY ACROSS SOUTHERN CALIFORNIA...
THE LAST VESTIGES OF COLD AIR ARE BEING DISPELLED OUT OF NEW
ENGLAND FOR THE REMAINDER OF TODAY INTO TONIGHT WITH SOME
LINGERING SNOW SHOWERS STILL POSSIBLE ACROSS FAR INTERIOR NEW
ENGLAND. CLEARING SKIES AND RETURN FLOW AHEAD OF THE PACIFIC
SYSTEM SLIDING THROUGH THE ROCKIES, COMBINING WITH WARMER/MOIST
AIR RETURNING OUT OF THE WESTERN GULF AHEAD OF AN AVERAGE
UPPER-LEVEL TROUGH; WILL RESULT IN WELL ABOVE TEMPERATURES TODAY
ACROSS THE NORTHERN PLAINS AND MIDWEST, SHIFTING TO THE EASTERN
HALF OF THE COUNTRY ON MONDAY, AND FINALLY EAST OF THE MISSISSIPPI
INTO TUESDAY AHEAD OF THE PACIFIC COLD FRONT. TODAY, 20-30 DEGREE
DEPARTURES WILL EXIST IN THE PLAINS AND TEMPER A BIT TO 15-25
DEGREES ABOVE NORMAL OVERNIGHT THROUGH TUESDAY MORNING. INCREASED
MOISTURE THROUGH THE LOWER MISSISSIPPI RIVER VALLEY WILL HAVE SOME
STRONGER SHOWERS AND POSSIBLE THUNDERSTORMS CLOSER TO THE GULF OF
MEXICO. RAIN-RATES MAY RESULT IN A FEW WIDELY SCATTERED INCIDENTS
OF FLOODING ACROSS THE DELTA REGION INTO SW LA TODAY, SHUNTING
SOUTH TO THE CENTRAL GULF COAST MONDAY INTO TUESDAY. THE WEATHER
PREDICTION CENTER HAS ISSUED A MARGINAL RISK FOR TODAY; AND
UPGRADES TO A SLIGHT RISK (LEVEL 2 OF 4) ON TUESDAY ACROSS
SOUTH-CENTRAL LA TO MOBILE BAY MAINLY FOR RISKS NEAR SUSCEPTIBLE
URBAN LOCATIONS ALONG I-10/12.
THE AFOREMENTIONED PACIFIC AIRMASS/FRONTAL ZONE HAS CROSS MUCH OF
THE NORTHERN ROCKIES AND HAS ALREADY DEVELOPED A STRONGER SURFACE
LOW JUST NORTH OF THE U.S. CANADA BORDER. ASSOCIATED STRONG WINDS
AND SNOWS FROM OVERNIGHT IS RESULTING IN DANGEROUS TRAVEL
CONDITIONS ACROSS E MONTANA WITH A BLIZZARD WARNING STILL IN
AFFECT ACROSS FAR EAST-CENTRAL MT UNTIL 6 PM MST TODAY.
DOWNSTREAM WARM AIR ADVECTION WILL OVER-TOP SOME REMAINING COLDER
AIR ACROSS NORTHERN MN INTO THE WESTERN GREAT LAKES TONIGHT.
WINTER STORM WARNINGS AND ADVISORIES ARE IN EFFECT ACROSS THE
NORTHER RED RIVER VALLEY INTO NORTHERN MN WHERE 4-7" OF SNOW ARE
EXPECTED. STRONG ONSHORE FLOW OFF LAKE SUPERIOR WILL FURTHER
ENHANCE LOCAL SNOW TOTALS ACROSS THE ARROWHEAD OF MN RANGE WITH
9-12"+ TOTALS EXPECTED.
BEHIND THE COLD FRONT A COMBINATION OF COLD AIR OFF THE PACIFIC,
AS WELL AS FROM EASTERN AK, YUKON WILL CONTINUE TO FILTER
SOUTHWARD DIRECTED THROUGH THE INTERMOUNTAIN REGION AND GREAT
BASIN OVER THE NEXT FEW DAYS. BELOW AVERAGE TEMPERATURES WILL
ALSO BLEED OUT IN THE PLAINS BY LATE MONDAY INTO TUESDAY WITH A
CLASSIC 'BLUE NORTHER' COLD FRONT DRIVING WELL THROUGH THE
SOUTHERN PLAINS INTO NORTHERN MEXICO BY TUESDAY. HIGH
TEMPERATURES WILL BE ABOUT 5-10 DEGREES BELOW NORMAL ACROSS MUCH
OF THE ROCKIES, SOUTHWEST AND EVENTUALLY INTO THE PLAINS.
PERHAPS MOST IMPACTFUL, IS THE SURGE DIRECTED THROUGH THE GREAT
BASIN INTO THE LOWER COLORADO RIVER VALLEY WILL RESULT IN WELL
ABOVE AVERAGE HIGH PRESSURE THAT SHOULD ALLOW FOR THE FRONT TO
CROSS THE PENINSULAR RANGE MONDAY. THIS WILL BRING VERY STRONG
SANTA ANA WINDS ACROSS SOUTHERN CALIFORNIA ON MONDAY AND GIVEN
DRY/LOW HUMIDITY CONDITIONS ALREADY IN PLACE; RED FLAG WARNINGS
HAVE BEEN ISSUED FOR THE EASTERN TRANSVERSE AND ALL PENINSULAR
RANGES FROM MONDAY INTO MID-WEEK; AS WELL AS A CRITICAL FIRE
(LEVEL 2 OF 3) FROM THE STORM PREDICTION CENTER. WINDS OF 35 TO
45 MPH IN THE VALLEYS AND GUSTS OF 50 TO 65 MPH IN THE MOUNTAINS
WILL HELP EXPAND ANY FIRES THAT DO DEVELOP QUICKLY AND MAY REDUCE
VISIBILITY WITH BLOWING SMOKE AND DUST ADDING TO TRAVEL CONCERNS
IN THE REGION.
GALLINA
GRAPHICS AVAILABLE AT
HTTPS://WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page