503
FXUS63 KGRB 062358
AFDGRB
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREEN BAY WI
558 PM CST TUE JAN 6 2026
UPDATED AVIATION PORTION FOR 00Z TAF ISSUANCE
KEY MESSAGES
- WINTER WEATHER ADVISORIES ARE IN EFFECT THROUGH LATE AFTERNOON
OR EARLY THIS EVENING FOR LINGERING IMPACTS FROM FREEZING RAIN.
UNTREATED AND SECONDARY ROADS WILL REMAIN SLIPPERY.
- DENSE FREEZING FOG POSSIBLE LATE TONIGHT INTO WEDNESDAY MORNING,
ESPECIALLY CENTRAL AND NORTH-CENTRAL WI. SLIPPERY TRAVEL COULD
RESULT.
- RAIN AND SOME SNOW EXPECTED LATE THURSDAY INTO THURSDAY NIGHT.
CHANCES FOR AT LEAST 1 INCH OF SNOW HIGHEST OVER NORTHERN WI
(30-40%).
- ANOTHER SYSTEM EXPECTED SATURDAY AND SATURDAY NIGHT. CHANCES FOR
AT LEAST 2 INCHES OF SNOW ACROSS THE ENTIRE AREA RANGE FROM
40-60%.
DISCUSSION
ISSUED AT 125 PM CST TUE JAN 6 2026
IMPACTS FROM FREEZING RAIN MAIN ISSUE THROUGH THIS EVENING. FOG
COULD BECOME DENSE AGAIN TONIGHT AS WELL. COUPLE OF MORE SYSTEMS
BRING RAIN/SNOW TO THE REGION STARTING LATE THURSDAY AND LASTING
INTO SATURDAY NIGHT.
FREEZING RAIN AND ICING IMPACTS THROUGH THIS EVENING...
AREA OF RAIN AND FREEZING RAIN CONTINUES TO SLIDE ACROSS THE
REGION. BACK EDGE OF STEADIER PRECIP IS INTO CENTRAL WI, WITH VERY
LIGHT MIST, FREEZING DRIZZLE OVER FAR NORTHERN WI. REST OF THE
AREA WILL BE IMPACTED BY RAIN AND FREEZING RAIN THROUGH LATE THIS
AFTERNOON. TEMPS HAVE SLOWLY WARMED OVER SOUTHERN PORTION OF THE
AREA, ESPECIALLY ALONG AND SOUTH OF HIGHWAY 10. READINGS ARE RIGHT
AROUND FREEZING ALONG THE HIGHWAY 29 CORRIDOR, THOUGH FOX VALLEY
IS MAINLY ABOVE FREEZING NOW. AREA THAT IS PROBABLY OF MOST
CONCERN FOR ADDITIONAL ICING OF UP TO 0.10 INCH WILL BE NORTHWEST
OF THE FOX VALLEY INTO THE BAYSHORE AREAS NEAR GREEN BAY NORTH TO
PESHTIGO AND OCONTO, AND POSSIBLY OVER DOOR COUNTY. AS THE COLD
FRONT WORKS SOUTHEAST THIS EVENING, MAY STILL SEE THE PRECIP END
AS A WINTRY MIX OF RAIN, SLEET AND SNOW. THIS WOULD ESPECIALLY BE
TRUE OVER FAR NORTHEAST WI AND ACROSS DOOR COUNTY. EARLIER
EXTENSIONS TO THE WINTER WEATHER ADVISORY SEEM FINE, THOUGH SOME
ADJUSTMENTS WILL LIKELY STILL BE NEEDED BASED ON TEMPERATURES AND
PRECIPITATION TRENDS.
FOG POTENTIAL LATE TONIGHT INTO WEDNESDAY MORNING...
LATE EVENING INTO THE OVERNIGHT, ONCE PRECIPITATION ENDS AND MID-
LEVEL MOISTURE DECREASES, COULD SEE FOG FORM AGAIN. THIS MORNING
IT WAS DENSE OVER THE FOX VALLEY. LATE TONIGHT INTO WEDNESDAY
MORNING, DENSE FOG MAY OCCUR OVER CENTRAL AND NORTH- CENTRAL WI.
AT LEAST THAT IS WHERE THE SIGNAL FROM THE SHORT TERM GUIDANCE IS
MOST FAVORABLE. IF AND WHERE IT DOES OCCUR, TEMPS WILL BE WELL
BELOW FREEZING, SO MORE FREEZING FOG, SLIPPERY TRAVEL COULD OCCUR.
WILL MENTION THIS IN THE HWO.
A QUIET INTERLUDE IN THE ACTIVE PATTERN...
HIGH PRESSURE AND GRADUAL MIXING WILL RESULT IN SKIES TURNING
PARTLY CLOUDY LATER WEDNESDAY, WITH DRY WEATHER LASTING INTO AT
LEAST MIDDAY THURSDAY. TEMPERATURES WILL RISE INTO MID 30S ON
WEDNESDAY AND PUSH INTO THE UPPER 30S, IF NOT EVEN A SPOT 40
DEGREE READING ON THURSDAY. SLIPPERY SPOTS MAY OCCUR ON WEDNESDAY
NIGHT AS TEMPS DROP BELOW FREEZING.
LOW PRESSURE SYSTEMS BRING MORE ACTIVE WEATHER LATE THIS WEEK INTO
THE WEEKEND...
SOUTHERN STREAM BECOMES ACTIVE WITH TWO SEPARATE SYSTEMS POISED
TO IMPACT THE WESTERN GREAT LAKES REGION. FIRST SHORTWAVE AND LOW
PRESSURE SYSTEM THAT COMES ASHORE IN NORTHERN BAJA CALIFORNIA ON
WEDNESDAY ARRIVES OVER WI ON THURSDAY. DESPITE LOOK OF WELL
DEVELOPED DEFORMATION AXIS OF QPF ON THE COLD SIDE OF THE LOW,
THERMALS ARE PRETTY WARM AND THE MAIN RISK OF SEEING SNOW WILL BE
OVER NORTHERN WI (NORTH OF WAUSAU TO MARINETTE) ON THURSDAY NIGHT.
PROBABILITIES OF SEEING 1" OR MORE OF SNOW FOR THOSE AREAS HAVE
INCREASED SLIGHTLY, BUT ARE STILL ARE MODEST AT AROUND 30%.
OTHERWISE, THIS LOOKS LIKE MAINLY A RAIN EVENT WITH TOTALS OVER
0.5 INCH LOOKING LIKELY OVER THE SOUTHEAST AREA AND EVEN SOME LOW-
END RISK (30-40%) OF SEEING OVER 1" OF RAIN, SOUTHERN FOX VALLEY
TO THE LAKESHORE. GIVEN THE MELTING SNOW AND IF THIS MUCH RAINFALL
OCCURS, COULD HAVE SOME MINOR FLOODING ISSUES WHERE STREET DRAINS
COULD BE CLOGGED WITH ICE AND SNOW AND ALSO IN OTHER LOW-LYING
AREAS.
SECOND SYSTEM COMES IN FOR THE WEEKEND AND INVOLVES PHASING BETWEEN
THE NORTHERN STREAM AND SOUTHERN STREAM, WHICH IS ALWAYS TRICKY
TO PIN DOWN. ALSO, THERE IS COLDER AIR WITH THIS SYSTEM, SO THE
CHANCES FOR SNOW EXPAND TO ALL AREAS. SPREAD IS HIGH BETWEEN THE
25TH AND 75TH PERCENTILE FOR SNOW FOR ESSENTIALLY THE SATURDAY TO
SATURDAY NIGHT PERIOD. PROBABILITIES FOR PLOWABLE SNOW OVER MOST
OF THE AREA (2+") HAVE TICKED UPWARD, WITH 40-60% SHOWN OVER THE
REGION, LOWEST NORTH-CENTRAL, HIGHEST EASTERN AND NORTHEAST WI.
THESE RECENT TRENDS ARE JUST EMERGING, SO WE'LL NEED TO STAY TUNED
TO SEE HOW THINGS CONTINUE TO TREND THE NEXT COUPLE DAYS FOR THIS
SYSTEM ON SATURDAY/SATURDAY NIGHT. DOES TURN COLDER BEHIND THE
SYSTEM TO CLOSE THE WEEKEND. COULD SEE LATER FORECASTS ADDING SOME
LAKE EFFECT TO FAR NORTHERN WI.
AVIATION
FOR 00Z TAF ISSUANCE
ISSUED AT 558 PM CST TUE JAN 6 2026
ALTHOUGH LINGERING PRECIPITATION WILL DEPART THE REGION NEAR THE
BEGINNING OF THE TAF PERIOD, FOG AND LOW STRATUS WILL REMAIN.
EXPECT LIFR/IFR CONDITIONS FOR MOST TAF SITES THROUGH WEDNESDAY
MORNING. SOME IMPROVEMENT WILL ARRIVE DURING THE DAY WEDNESDAY AS
WARMER AND DRIER CONDITIONS ARRIVE, WHICH SHOULD BRING IMPROVING
FLYING CONDITIONS FOR THE AFTERNOON. FOG MAY RETURN AGAIN LATE
WEDNESDAY, BEYOND THE CURRENT TAF PERIOD.
WINDS WILL BE LIGHT THROUGH THE TAF PERIOD.
GRB WATCHES/WARNINGS/ADVISORIES
WINTER WEATHER ADVISORY UNTIL 8 PM CST THIS EVENING FOR WIZ019-
020-074.
WINTER WEATHER ADVISORY UNTIL 10 PM CST THIS EVENING FOR WIZ022.
DISCUSSION.....JLA
AVIATION.......UHLMANN
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