814
FXUS01 KWBC 150728
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
224 AM EST MON DEC 15 2025
VALID 12Z MON DEC 15 2025 - 12Z WED DEC 17 2025
..HEAVY RAIN AND STRONG WINDS IMPACT THE NORTHWEST
..LAKE EFFECT SNOW WRAPS UP THIS EVENING
...ABOVE AVERAGE TEMPERATURES EXPAND FROM WEST INTO CENTRAL U.S.,
WHILE AN ARCTIC AIRMASS GRIPS THE EAST THROUGH TONIGHT...
MULTIPLE ROUNDS OF SHORTWAVES CYCLING BENEATH AN UPPER LEVEL LOW
STATIONED OVER SOUTHEAST ALASKA WILL DIRECT A CONTINUOUS FETCH OF
MOISTURE INTO THE NORTHWEST U.S. OVER THE NEXT FEW DAYS. AT THE
SURFACE, A LOW PRESSURE SYSTEM WILL BRING HEAVY RAINFALL TO
PORTIONS OF THE PACIFIC NORTHWEST AND NORTHERN ROCKIES TODAY. A
SLIGHT RISK (AT LEAST 15% CHANCE) OF EXCESSIVE RAINFALL IS IN
EFFECT FOR PORTIONS OF WESTERN WASHINGTON AND NORTHWESTERN OREGON,
WHERE INSTABILITY, ANOMALOUS MOISTURE AND VULNERABLE SOILS FROM
RECENT HEAVY RAIN, WILL CONTRIBUTE TO THE FLASH FLOOD THREAT.
STRONG WINDS WILL ALSO BE AN ISSUE TODAY AS THE SYSTEM COMES
ONSHORE. HIGH WIND WARNINGS AND WIND ADVISORIES ARE IN EFFECT.
CONDITIONS SHOULD IMPROVE ON TUESDAY AS THE COLD FRONT AND MOST OF
THE MOISTURE PUSH EAST. HOWEVER, ANOTHER ROUND OF PRECIPITATION
WILL ARRIVE TUESDAY NIGHT ALONG WITH ANOTHER LOW PRESSURE SYSTEM.
THIS SECOND WAVE WILL BRING HEAVY SNOW TO THE HIGHER ELEVATIONS OF
THE NORTHERN CASCADES TUESDAY NIGHT.
LAKE EFFECT SNOW SHOULD BEGIN TO WRAP UP ACROSS THE UPPER GREAT
LAKES THIS AFTERNOON, AND THEN THE LOWER GREAT LAKES THIS EVENING.
TROUGHING OVER THE EASTERN U.S. WILL CONTRIBUTE TO BELOW AVERAGE
TEMPERATURES FOR MUCH OF THE REGION THROUGH TONIGHT, BEFORE
BEGINNING TO MODERATE ON TUESDAY. SURFACE HIGH PRESSURE OVER THE
SOUTHEAST WILL GENERATE FREEZING TEMPERATURES ACROSS THE GULF
COAST. FREEZE WARNINGS ARE IN EFFECT FROM SOUTHEASTERN TEXAS TO
SOUTHERN GEORGIA/NORTHERN FLORIDA. ELSEWHERE, UPPER RIDGING IN THE
WEST WILL EXPAND EAST OVER THE COMING DAYS. SEVERAL TEMPERATURE
RECORDS MAY BE TIED OR BROKEN ACROSS THE WEST DUE TO THE UNUSUALLY
WARM CONDITIONS.
KEBEDE
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