331
FXUS63 KGRB 010350
AFDGRB
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREEN BAY WI
950 PM CST SAT JAN 31 2026
UPDATED AVIATION PORTION FOR 06Z TAF ISSUANCE
KEY MESSAGES
- LIGHT SNOW IS FORECAST TO MOVE ACROSS THE REGION SUNDAY
AFTERNOON AND SUNDAY NIGHT. ACCUMULATIONS OF A HALF INCH (60-80%
CHANCE) TO ONE INCH (10-40% CHANCE) ARE EXPECTED. SLIPPERY
TRAVEL CONDITIONS ARE EXPECTED, WHICH MAY EXTEND INTO THE MONDAY
MORNING COMMUTE.
- A POTENT CLIPPER SYSTEM MAY IMPACT THE AREA NEXT THURSDAY AND
FRIDAY. WHILE SIGNIFICANT TIMING AND TRACK UNCERTAINTIES REMAIN,
THIS SYSTEM HAS THE POTENTIAL TO BRING ACCUMULATING SNOW AND
GUSTY WINDS.
- HIGHS IN THE 20S WILL BE COMMON FOR MUCH OF NEXT WEEK, POSSIBLY
REACHING 30 DEGREES AT A FEW LOCATIONS THURSDAY AND FRIDAY.
DISCUSSION
ISSUED AT 219 PM CST SAT JAN 31 2026
THE LOW CLOUDS FINALLY CLEAR EARLY THIS AFTERNOON ACROSS THE FAR
NORTH AND EAST-CENTRAL WI. WITH ABUNDANT SUNSHINE, TEMPERATURES
CLIMB INTO THE 20S. FOR TONIGHT, SKIES WILL START OUT CLEAR
WITH CALM WINDS SHOULD ALLOW TEMPERATURES TO FALL OFF QUICKLY
AFTER SUNSET. HIGH CLOUDS WILL BE ON THE INCREASE THROUGH
THE LATE EVENING AND OVERNIGHT, ALONG WITH INCREASING WINDS
SHOULD ALLOW TEMPERATURES TO RISE A FEW DEGREES OVERNIGHT AT
MOST PLACES.
THE NEXT SYSTEM THEN APPROACHES FROM THE NORTHWEST LATE TONIGHT,
BRINGING THE CHANCES OF LIGHT SNOW INTO PORTIONS OF CENTRAL
AND NORTH-CENTRAL WI AROUND MIDDAY SUNDAY. THE MODELS HAVE BEEN
CONSISTENT THAT IT WILL TAKE AWHILE FOR THE SNOW TO MAKE IT INTO
FAR EASTERN WI UNTIL LATE AFTERNOON IF NOT INTO THE EVENING AT
SOME PLACES. MOST LOCATIONS SHOULD SEE A HALF INCH TO ONE INCH
OF SNOW. THE HIGHEST PROBABILITIES OF 1" OR GREATER (30-50%) ARE
ALONG AND WEST OF INTERSTATE 39 AND HIGHWAY 51. THE SNOW SHOULD
TAPER OFF EASTERN WI LATE EARLY MONDAY MORNING.
EXCEPT FOR A SMALL CHANCE OF SNOW SHOWERS MONDAY AND TUESDAY
OVER THE FAR NORTH, TRANQUIL CONDITIONS WILL PREVAIL MONDAY INTO
WEDNESDAY NIGHT. THE NEXT, AND MORE POTENT CLIPPER SYSTEM
ARRIVES ON THURSDAY AND CONTINUES INTO THURSDAY NIGHT INTO FRIDAY
MORNING. THE CHANCES FOR SNOW ARE 40-60% AT THE MOMENT. SEVERAL
INCHES OF SNOW ARE POSSIBLE WITH THIS SYSTEM. THERE IS A NEW
WRINKLE TO THE FORECAST. THE LATEST ECMWF/CANADIAN BRING WARMER
AT 850MB INTO CENTRAL AND EAST-CENTRAL WI. IF THIS SCENARIO
DOES PLAY OUT, THERE COULD BE A LITTLE MIX OF SLEET OR FREEZING
RAIN THAT COULD LIMIT SNOWFALL TOTALS. THE SNOW SHOULD END BY
MONDAY MORNING, THOUGH SLIPPERY STRETCHES COULD LINGER INTO THE
MORNING COMMUTE.
AS FOR TEMPERATURES, HIGHS WILL BE IN THE 20S MUCH OF THE WEEK
WITH A FEW LOCATIONS POSSIBLY REACHING 30 DEGREES THURSDAY
AND FRIDAY. HOWEVER, ANOTHER SURGE OF ARCTIC AIR IS EXPECTED
NEXT SATURDAY BEHIND THE CLIPPER SYSTEM.
AVIATION
FOR 06Z TAF ISSUANCE
ISSUED AT 950 PM CST SAT JAN 31 2026
HIGH PRESSURE CENTERED OVER THE REGION WILL MAINTAIN VFR AND MOSTLY CLEAR
SKIES THROUGH THE EARLY MORNING. LOW CONFIDENCE EXISTS REGARDING PATCHY FOG
DEVELOPMENT ACROSS CENTRAL AND NORTH-CENTRAL WI (KAUW/KCWA/KRHI)
LATE TONIGHT.
CLOUDS INCREASE AND CEILINGS LOWER THROUGH THE MORNING AS THE NEXT SYSTEM
APPROACHES FROM THE WEST. LIGHT SNOW IS EXPECTED TO COMMENCE
AROUND 18Z SUN FOR KAUW, KCWA, AND KRHI, WITH VISIBILITY LIKELY
DROPPING TO MVFR CONDITIONS (3-4SM) DURING THE AFTERNOON.
CEILINGS WILL GENERALLY RESIDE IN THE LOW-END MVFR RANGE
(1000-1500 FT AGL) WITHIN THE SNOW. BRIEF IFR VISIBILITIES WILL BE
POSSIBLE, MOST LIKELY TO OCCUR AFTER 00Z MON.
MVFR CONDITIONS IN LIGHT SNOW WILL SPREAD TOWARD THE FOX VALLEY AND
LAKESHORE (KGRB/KATW/KMTW) BETWEEN 22Z-24Z SUN. TOTAL SNOW ACCUMULATIONS OF
0.5 TO 1.0 INCH ARE EXPECTED FOR MOST SITES BY EARLY MONDAY MORNING.
SFC WINDS REMAIN LIGHT AND VARIABLE OVERNIGHT, BACKING SOUTH TO SOUTHWEST
AT 5-10 KTS BY SUNDAY AFTERNOON. A BRIEF PERIOD OF LLWS IS POSSIBLE NEAR
KRHI SUNDAY MORNING.
GRB WATCHES/WARNINGS/ADVISORIES
NONE.
DISCUSSION.....ECKBERG
AVIATION.......MPC
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