925
FXUS63 KGRB 190355
AFDGRB
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREEN BAY WI
955 PM CST THU DEC 18 2025
UPDATED AVIATION PORTION FOR 06Z TAF ISSUANCE
UPDATE
ISSUED AT 722 PM CST THU DEC 18 2025
EARLY THIS EVENING, THE ARCTIC FRONT HAS MOVED THROUGH THE FOX
VALLEY AND IS APPROACHING THE LAKE MICHIGAN SHORELINE. AS ARCTIC
AIR RAPIDLY MOVES EAST ACROSS THE REGION, TEMPERATURES ARE FALLING
INTO THE UPPER TEENS OVER WOOD COUNTY AND ARE FALLING TO NEAR
FREEZING ACROSS THE FOX VALLEY.
NUMEROUS CALLS TO AREAS WEST OF THE FOX VALLEY SUGGEST ICY ROADS
FROM WAUPACA TO WOOD AND MARATHON COUNTIES. REPORTS ACROSS
MARATHON AND NORTHERN WOOD COUNTIES SUGGEST ROAD CONDITIONS ARE
VERY TREACHEROUS. SEVERAL ACCIDENTS HAVE BEEN REPORTED BY LAW
ENFORCEMENT IN THOSE COUNTIES. A BRIEF PERIOD OF FREEZING RAIN
HAS UNDOUBTEDLY CONTRIBUTED TO THE RAPIDLY DETERIORATING ROAD
CONDITIONS.
CONCERN THEN SHIFTS INTO THE FOX VALLEY OVER THE NEXT 1-2 HOURS.
ROAD TEMPERATURES 33-34 DEGREES SUGGEST CONDITIONS ARE NOT QUITE
READY FOR ICING UP, BUT SUSPECT THAT WILL CHANGE BY 8 PM. WILL BE
MONITORING THE ROAD CONDITIONS CLOSELY OVER THE FOX VALLEY.
KEY MESSAGES
- A FLASH FREEZE IS LIKELY LATE THIS AFTERNOON AND EARLY EVENING,
WITH SNOW SHOWERS AND ICY ROAD CONDITIONS CONTINUING TONIGHT. AN
INCH OR LESS OF SNOW IS EXPECTED MOST PLACES, THOUGH VILAS
COUNTY WILL LIKELY SEE 1 TO 3 INCHES. WEST TO NORTHWEST WINDS
GUSTING TO 30 TO 35 MPH WILL CAUSE SOME DRIFTING SNOW.
- NORTHWEST GALES EXPECTED ON LAKE MICHIGAN THROUGH FRIDAY
MORNING.
- LIGHT SNOW POSSIBLE FRIDAY NIGHT INTO SATURDAY MORNING, ESPECIALLY
OVER FAR NORTHERN WISCONSIN.
DISCUSSION
ISSUED AT 313 PM CST THU DEC 18 2025
A LARGE AREA OF LIGHT RAIN ASSOCIATED WITH THE WARM CONVEYOR BELT
OF THE SYSTEM WAS STILL PULLING THROUGH EASTERN WI THIS
AFTERNOON, BUT A GENERAL BREAK IN THE PRECIPITATION HAD MOVED
INTO OUR SOUTHWEST COUNTIES. FOGGY CONDITIONS WERE IMPROVING, BUT
SOME LOWER VISIBILITIES CONTINUED OVER FAR NORTHEAST WI. ALTHOUGH
THE INITIAL COLD FRONT WAS MOVING THROUGH EASTERN WI AT THIS TIME,
A SECONDARY FRONT WITH MUCH COLDER ARCTIC AIR WAS SURGING ACROSS
MN INTO FAR WESTERN WI. THIS WILL IMPACT NC/C WI LATER THIS
AFTERNOON, AND EASTERN WI THIS EVENING. WV IMAGERY SHOWED A POTENT
UPPER TROUGH/LOW MOVING THROUGH MN, WITH SOME FAIRLY INTENSE SNOW
SHOWERS BEING REPORTED IN SOUTHERN MN. THESE SHOULD MOVE INTO
CENTRAL WI TOWARD 00Z/FRI.
THIS AFTERNOON AND TONIGHT'S WINTRY SYSTEM:
A WINTER WEATHER ADVISORY HAS BEEN ISSUED FOR A FLASH FREEZE LATE
THIS AFTERNOON AND EARLY EVENING, FOLLOWED BY AROUND AN INCH OF
SNOW AS THE UPPER TROUGH SWINGS THROUGH TONIGHT. A STEADY LIGHT
RAIN, HIGH DEW POINTS AND FOG HAVE RESULTED IN WET ROADS
REGIONWIDE. ROADS WILL BECOME ICY AND TREACHEROUS AS SUB-
FREEZING TEMPERATURES SURGE INTO NC/C WI AFTER 4 PM, THE FOX
VALLEY AFTER 6 PM, AND FAR NORTHEAST WI/DOOR COUNTY AFTER 8 PM.
HAVE INCREASED POPS/QPF/SNOWFALL, AS STRONG FORCING WITH THE UPPER
TROUGH INTERACTS WITH A DEEP DENDRITIC GROWTH ZONE. THOUGH WE'RE
NOT EXPECTING SNOW SQUALLS DUE TO A LATER ARRIVAL OF THE SNOW
SHOWERS, UPSTREAM OBSERVATIONS SUPPORT POTENTIAL FOR NUMEROUS SNOW
SHOWERS AND BRIEF PERIODS OF MODERATE SNOW. THE SNOW WILL LAST
THROUGH MUCH OF THE NIGHT IN NORTHERN AND EASTERN WI. WEST TO
NORTHWEST WINDS GUSTING TO 30 TO 35 MPH WILL ALSO CAUSE SOME
DRIFTING OF THE POWDERY SNOW LATER THIS EVENING AND OVERNIGHT.
LAKE-EFFECT SNOW SHOWERS WILL BOOST SNOWFALL TOTALS OVER VILAS
COUNTY, WHERE 2 TO 3 INCHES ARE EXPECTED OVER THE NORTHERN PART
OF THE COUNTY.
REST OF THE FORECAST:
A CLIPPER SYSTEM PASSES THROUGH THE NORTHERN WI FRIDAY NIGHT INTO
EARLY SATURDAY, BRINGING A ROUND OF LIGHT ACCUMULATING SNOW (1-2
INCHES). NO OTHER SIGNIFICANT PRECIPITATION EVENTS ARE EXPECTED
THROUGH THE REST OF THE WEEK. TEMPERATURES WILL BE ON A ROLLER
COASTER RIDE, AS A COUPLE DIFFERENT COLD FRONTS MOVE THROUGH THE
REGION.
MARINE:
THE SOUTH FLOW/WAA PART OF THIS SYSTEM HAS NOT PRODUCED GALE FORCE
GUSTS TO THIS POINT, BUT GALE FORCE GUSTS ARE LIKELY AFTER THE
ARCTIC FRONT MOVES THROUGH LATER THIS EVENING. THE GALE WARNING
HAS BEEN EXTENDED THROUGH 18Z/FRIDAY.
AVIATION
FOR 06Z TAF ISSUANCE
ISSUED AT 955 PM CST THU DEC 18 2025
LATE THIS EVENING, TEMPERATURES HAVE FALLEN BELOW FREEZING AT MOST
LOCATIONS ACROSS THE REGION WITH THE EXCEPTION OF DOOR COUNTY.
BENEATH AN UPPER TROUGH, PERIODS OF LIGHT SNOW CAN BE EXPECTED FOR
THE REST OF THE NIGHT, TAPERING OFF TOWARDS SUNRISE. IN THE SNOW,
VISIBILITIES WILL DROP TO 1-2 SM AT TIMES. AT KRHI, LAKE- EFFECT
SNOW WILL MAINTAIN IFR/MVFR CONDITIONS THROUGH EARLY FRIDAY.
WINDS WILL BE A MAJOR FACTOR TONIGHT, GUSTING 25-35 KTS FROM THE
WEST- NORTHWEST. MINOR DRIFTING OF THE POWDERY SNOW IS POSSIBLE.
CONDITIONS WILL GRADUALLY IMPROVE LATE TONIGHT THROUGH FRIDAY
MORNING AS HIGH PRESSURE BUILDS IN, THOUGH BREEZY WINDS WILL
PERSIST. FLIGHT CONDITIONS WILL BECOME VFR IN THE AFTERNOON TO GO
ALONG WITH DIMINISHING WINDS.
CEILINGS WILL LOWER ONCE AGAIN ON FRIDAY NIGHT AHEAD OF THE NEXT
CLIPPER. LOW LEVEL WIND SHEAR WILL DEVELOP AT RHI BY THE END OF
THE TAF PERIOD.
GRB WATCHES/WARNINGS/ADVISORIES
WINTER WEATHER ADVISORY UNTIL 6 AM CST FRIDAY FOR WIZ005-010>013-
018>022-030-031-035>040-045-048>050-073-074.
UPDATE.........MPC
DISCUSSION.....KIECKBUSCH
AVIATION.......MPC
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