818
FXUS63 KGRB 100346
AFDGRB
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREEN BAY WI
946 PM CST FRI JAN 9 2026
UPDATED AVIATION PORTION FOR 06Z TAF ISSUANCE
KEY MESSAGES
- ACCUMULATING SNOW IS EXPECTED SATURDAY INTO SATURDAY NIGHT. MOST
PLACES SHOULD GET BETWEEN A HALF INCH AND 2 INCHES OF SNOW, BUT
HIGHER AMOUNTS ARE POSSIBLE IN THE LAKESHORE COUNTIES AND IN
VILAS COUNTY.
- A WEAK CLIPPER SYSTEM WILL BRING A CHANCE OF LIGHT SNOW
ACCUMULATIONS TO NORTHERN WISCONSIN SUNDAY NIGHT. A SECOND
STRONGER CLIPPER COULD PRODUCE LIGHT ACCUMULATIONS REGIONWIDE
LATE MONDAY NIGHT INTO TUESDAY NIGHT, WITH ADDITIONAL SNOW
CONTINUING OVER NORTH CENTRAL WISCONSIN DUE TO LAKE-EFFECT ON
WEDNESDAY. GUSTY NORTH WINDS COULD OCCUR ON WEDNESDAY.
- AFTER A BRIEF COOL DOWN OVER THE WEEKEND, TEMPERATURES WILL
REBOUND TO ABOVE NORMAL EARLY NEXT WEEK, THEN FALL AGAIN INTO
MIDWEEK.
DISCUSSION
ISSUED AT 345 PM CST FRI JAN 9 2026
SUBSIDENCE BEHIND A DEPARTING SHORT-WAVE AND INCOMING HIGH
PRESSURE RIDGE, COMBINED WITH DOWNSLOPING NORTHWEST WINDS, HAVE
CAUSED LOW CLOUDS TO GRADUALLY ERODE OVER CENTRAL AND EAST CENTRAL
WI THIS AFTERNOON. EXPECT THIS TREND TO CONTINUE OVER NORTHERN WI
EARLY THIS EVENING. WV IMAGERY SHOWED A NORTHERN STREAM SHORT-WAVE
APPROACHING FROM THE EASTERN DAKOTAS, WITH A SOUTHERN STREAM
UPPER LOW LIFTING NORTHEAST FROM THE OK PANHANDLE.
AFTER A QUICK DROP IN TEMPERATURES THIS EVENING, EXPECT TEMPS TO
STEADY OUT OVERNIGHT AS THICKER HIGH/MID CLOUDS ARRIVE. SOME
MODELS WERE SUGGESTING FOG DEVELOPMENT OVER NC WI OVERNIGHT, BUT
GIVEN THE EXPECTED CLOUD TRENDS, THIS SHOULD BE PATCHY AND NOT AS
IMPACTFUL AS THE PREVIOUS FEW DAYS. LIGHT SNOW IS EXPECTED TO
DEVELOP IN OUR WESTERN COUNTIES LATE TONIGHT, AS THE CLIPPER AND
ASSOCIATED COLD FRONT ARRIVES. A DUSTING COULD OCCUR BY DAYBREAK.
SATURDAY AND SATURDAY NIGHT SNOWFALL... UNCERTAINTY REMAINS IN
SNOWFALL AMOUNTS DUE TO SIGNIFICANT DIFFERENCES IN HOW THE MODELS
HANDLE PHASING OF THE NORTHERN AND SOUTHERN STREAM SYSTEMS. MOST
OF THE 12Z MODELS SUGGEST THAT THE NORTHERN STREAM CLIPPER AND
ASSOCIATED COLD FRONT WILL SHIFT JUST EAST OF THE FORECAST AREA
BEFORE SIGNIFICANT PHASING OCCURS ON SATURDAY. THIS WOULD PUSH
THE MORE SIGNIFICANT ACCUMULATIONS NORTHEAST OF GRB CWA AND INTO
THE CENTRAL U.P. AND NORTHERN LOWER MICHIGAN, WITH PERHAPS SOME
DECENT SNOW AMOUNTS OCCURRING OVER DOOR COUNTY. THE ECMWF AND
CANADIAN MODELS CONTINUE TO PRODUCE HEAVY SNOW OVER PARTS OF
EASTERN WI. WILL SIDE WITH THE LESS IMPACTFUL SOLUTIONS RIGHT NOW,
WITH MOST PLACES ONLY GETTING AN INCH OR TWO OF SNOW, WITH
LOCALLY HIGHER AMOUNTS IN VILAS AND DOOR COUNTIES. OVERALL
CONFIDENCE REMAINS LOW, WHICH IS INHERENT WITH ANY PHASING SYSTEM.
GIVEN THIS UNCERTAINTY, WILL HOLD OFF ON ANY HEADLINES THIS
AFTERNOON, EVEN THOUGH THE CURRENT SNOWFALL FORECAST SUPPORTS AN
ADVISORY OVER DOOR COUNTY.
FORECAST BEYOND SATURDAY NIGHT...
A WEAK CLIPPER SYSTEM WILL BRUSH THROUGH NORTHERN WI SUNDAY NIGHT,
AND COULD BRING LIGHT ACCUMULATIONS AND SLIPPERY ROADS THERE. A
SECOND STRONGER CLIPPER ARRIVES LATE MONDAY NIGHT AND IMPACTS THE
REGION THROUGH WEDNESDAY. ACCUMULATING SNOW IS EXPECTED OVER MUCH
OF THE FORECAST AREA THROUGH TUESDAY NIGHT, WITH ADDITIONAL
ACCUMULATIONS DUE TO LAKE-EFFECT EXPECTED OVER NORTH CENTRAL WI
ON WEDNESDAY. ANOTHER SYSTEM ARRIVES THURSDAY NIGHT INTO FRIDAY,
BUT DETAILS ARE SKETCHY THIS FAR OUT.
TEMPERATURES COOL DOWN A BIT THIS WEEKEND, THEN WARM TO ABOVE
NORMAL AGAIN EARLY NEXT WEEK. A DECENT SURGE OF COLDER AIR AND
GUSTY NORTH WINDS FOLLOWS THE MIDWEEK CLIPPER SYSTEM, LEADING TO
COOLER TEMPERATURES FOR THE LATTER HALF OF THE WORK WEEK.
AVIATION
FOR 06Z TAF ISSUANCE
ISSUED AT 945 PM CST FRI JAN 9 2026
PATCHES OF MVFR CLOUDS ARE HANGING TOUGH ACROSS FAR NORTHEAST WI.
MEANWHILE, MVFR CLOUDS ARE EXPANDING AND SPREADING NORTH ACROSS
SOUTHEAST WI. AND A CLIPPER SYSTEM IS PRODUCING A BAND OF LIGHT
SNOW WITH IFR VISIBILITIES OVER MINNESOTA THIS EVENING.
BASED ON THE TRENDS ABOVE, TRENDED EARLIER BRINGING IN MVFR
CEILINGS TO EAST- CENTRAL WI OVERNIGHT. WILL START FLIGHT
CONDITIONS AS MVFR AT TAF START TIME AS LOW CLOUDS CONTINUE TO
EXPAND.
THE CLIPPER REMAINS ON TRACK TO BRING LIGHT SNOW TO THE REGION,
STARTING AROUND 11-12Z AT THE TAF SITES. FLIGHT CONDITIONS WILL
LIKELY DROP TO IFR AS THIS OCCURS, BUT A BRIEF PERIOD OF LIFR IS
POSSIBLE OVER EAST-CENTRAL WI ON SATURDAY MORNING. THE HEAVIEST
SNOW WILL BE OVER THE LAKESHORE WHERE THERE IS A 50-60% CHANCE OF
2 INCHES OR MORE OF ACCUMULATIONS.
THE SNOW WILL DIMINISH AT MOST LOCATIONS EXCEPT FOR NORTHERN DOOR
COUNTY BY MIDDAY SATURDAY. PERIODS OF LIGHT SNOW AND AND FLURRIES
WILL THEN MOVE BACK INTO NORTH-CENTRAL AND NORTHEAST WI FROM MID
TO LATE AFTERNOON AND CONTINUE THROUGH THE END OF THE TAF PERIOD.
NORTHERLY LOW LEVEL WIND SHEAR IS FORECAST TO DEVELOP ACROSS
NORTH-CENTRAL (RHI/AUW/CWA) TAF SITES AFTER 03Z SUN.
LIGHT WINDS TONIGHT WILL BECOME NORTHWEST ON SATURDAY, WITH GUSTS
TO 20 KTS IN THE AFTERNOON AND EVENING.
GRB WATCHES/WARNINGS/ADVISORIES
NONE.
DISCUSSION.....KIECKBUSCH
AVIATION.......MPC
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