621
FXUS01 KWBC 160716
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
210 AM EST TUE DEC 16 2025
VALID 12Z TUE DEC 16 2025 - 12Z THU DEC 18 2025
..HEAVY RAIN AND SNOW LIKELY IN NORTHWEST THIS WEEK
...ABOVE AVERAGE TEMPERATURES CONTINUE ACROSS THE WEST AND CENTRAL
U.S., WHILE ARCTIC AIR BEGINS TO ERODE IN THE EAST ON WEDNESDAY...
A SERIES OF SURFACE LOW PRESSURE SYSTEMS WILL BRING HEAVY RAIN,
HEAVY MOUNTAIN SNOW AND HIGH WINDS TO THE NORTHWEST OVER THE NEXT
SEVERAL DAYS. SYSTEM NUMBER ONE WILL ARRIVE OVER THE PACIFIC
NORTHWEST TONIGHT AND WILL PRODUCE HEAVY RAINFALL FROM THE
NORTHERN CALIFORNIA COAST UP TO WESTERN WASHINGTON THROUGHOUT THE
COURSE OF THE DAY ON WEDNESDAY. HEAVY SNOW WILL OCCUR OVER MUCH OF
THE NORTHERN CASCADES THIS EVENING BEFORE EXPANDING INTO THE
SOUTHERN CASCADES BEGINNING WEDNESDAY MORNING, AFTER THE PASSAGE
OF A POTENT COLD FRONT. SEVERAL FEET OF SNOW ARE EXPECTED TO
ACCUMULATE OVER THE CASCADES AND OLYMPICS BY THURSDAY MORNING.
RAIN AND MOUNTAIN SNOW SPREAD INTO THE NORTHERN ROCKIES, WHERE 1-2
FEET (ISOLATED HIGHER AMOUNTS POSSIBLE) MAY ACCUMULATE ON
WEDNESDAY. WIND, WINTER, AND FLOODING RELATED WATCHES AND WARNINGS
ARE IN EFFECT FOR MUCH OF THE NORTHWEST FOR THE NEXT COUPLE OF
DAYS AT LEAST.
BROAD UPPER-LEVEL RIDGING OVER THE WEST AND CENTRAL U.S., WILL
CONTRIBUTE TO ABOVE AVERAGE TEMPERATURES THIS WEEK. WIDESPREAD
TEMPERATURE RECORDS MAY BE TIED OR BROKEN IN THE WEST DURING THIS
TIME. THE ARCTIC AIRMASS THAT GRIPPED THE EASTERN U.S. FOR THE
PAST COUPLE OF DAYS WILL BEGIN TO MODERATE AS TEMPERATURES RISE
BENEATH UPPER RIDGING OVER THE REGION. ELSEWHERE, A WEAK LOW
PRESSURE SYSTEM, SUPPORTED BY A MID-LEVEL SHORTWAVE ROTATING
ACROSS MEXICO, WILL GENERATE SHOWERS AND THUNDERSTORMS OVER
PORTIONS OF THE SOUTH TEXAS COAST BEGINNING TONIGHT AND CONTINUING
THROUGH WEDNESDAY AFTERNOON.
KEBEDE
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