559
FXUS01 KWBC 162001
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
300 PM EST MON DEC 16 2024
VALID 00Z TUE DEC 17 2024 - 00Z THU DEC 19 2024
...ATMOSPHERIC RIVER TO BRING UNSETTLED WEATHER TO THE NORTHWEST,
INCLUDING HEAVY RAINS FOR THE COASTAL RANGES AND ACCUMULATING SNOW
FOR THE HIGHER ELEVATIONS OF THE CASCADES...
...ABOVE AVERAGE TEMPERATURES EXPECTED FOR MUCH OF THE LOWER 48
INTO MID-WEEK...
THE PATTERN WILL REMAIN ACTIVE ACROSS THE NORTHWESTERN U.S.,
ESPECIALLY THE PACIFIC NORTHWEST, AS A STRONG ATMOSPHERIC RIVER
TAKES AIM ACROSS WASHINGTON AND OREGON FOR TUESDAY. LOW LEVEL
ONSHORE FLOW WILL REMAIN ACROSS THE PACIFIC NORTHWEST AS THE
LATEST IN A SERIES OF UPPER LEVEL TROUGHS MOVES INLAND TONIGHT
WHILE WEAKENING, FOLLOWED BY STRONGER BUT QUICK MOVING SYSTEM FOR
TUESDAY AFTERNOON/EVENING. SHOWERS WILL TRANSITION TO STEADY RAIN
TOMORROW WITH AREAS OF HEAVY RAIN BECOMING LIKELY LATE TUESDAY
MORNING INTO THE EVENING AHEAD OF A WARM FRONT. AS A COLD FRONT
NEARS THE COAST LATE TUESDAY AFTERNOON/EVENING, HEAVY RAIN IS
LIKELY FOR THE COASTAL RANGES OF NORTHERN OREGON INTO WASHINGTON
ALONG WITH THE CASCADES. WHILE LIGHT TO MODERATE SNOW IS
ANTICIPATED FOR PORTIONS OF THE CASCADE RANGE THROUGH TUESDAY
MORNING, SNOW LEVELS WILL RISE TO 7000-8000 FT ABOVE SEA LEVEL FOR
THE WASHINGTON CASCADES DURING THE HEIGHT OF THE ATMOSPHERIC RIVER
EVENT LATE TUESDAY WITH ACCUMULATING SNOW CHANGING TO LOCALLY
HEAVY RAIN. THE HEAVIEST RAIN IS EXPECTED INTO THE OLYMPICS WHERE
2-DAY RAINFALL TOTALS OF 5 TO 7+ INCHES ARE EXPECTED THROUGH
WEDNESDAY MORNING.
ELSEWHERE ACROSS THE COUNTRY, THE WEATHER WILL BE RELATIVELY
QUIET. A PAIR OF COLD FRONTS MOVING EASTWARD FROM THE GREAT
PLAINS/MIDWEST OVER THE NEXT FEW DAYS WILL MAINTAIN WET AND
UNSETTLED WEATHER FROM THE LOWER/MIDDLE MISSISSIPPI VALLEY TO THE
EAST COAST. ACROSS FLORIDA, LOCALLY HEAVY RAIN WILL BE POSSIBLE
ALONG THE EAST COAST OF THE PENINSULA ON TUESDAY WITH AN EASTERLY
LOW LEVEL FLOW REGIME IN PLACE, TAPPING INTO ANOMALOUS MOISTURE
OVER THE CARIBBEAN. RAIN WILL LINGER INTO WEDNESDAY ACROSS FLORIDA.
TEMPERATURES FOR MANY IN THE LOWER 48 WILL RUN 10-20 DEGREES ABOVE
MID-DECEMBER AVERAGES WITH THE EXCEPTION OF THE NORTH-CENTRAL U.S.
TEMPERATURES FROM EASTERN MONTANA TO THE UPPER MISSISSIPPI VALLEY
WILL LIKELY BE 5 TO 15 DEGREES BELOW AVERAGE AND CARRY LIGHT
SNOWFALL ACCUMULATIONS FOR PORTIONS OF THE REGION.
OTTO
GRAPHICS AVAILABLE AT
HTTPS://WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page