057
FXUS63 KGRB 201701
AFDGRB
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREEN BAY WI
1201 PM CDT MON OCT 20 2025
UPDATED AVIATION PORTION FOR 18Z TAF ISSUANCE
KEY MESSAGES
- AFTER A BRIEF WARMUP TODAY, TEMPERATURES DROP BELOW NORMAL
TUESDAY THROUGH THURSDAY, THEN RETURN TO NEAR NORMAL NEXT
WEEKEND.
- RAIN RETURNS LATE THIS AFTERNOON AND EVENING, AND CONTINUES
THROUGH TUESDAY. PERIODIC SHOWERS REMAIN POSSIBLE INTO THURSDAY.
- BLUSTERY CONDITIONS ANTICIPATED THROUGH WEDNESDAY, ALONG WITH
HAZARDOUS CONDITIONS FOR SMALL CRAFT ON LAKE MICHIGAN.
DISCUSSION
ISSUED AT 400 AM CDT MON OCT 20 2025
LIGHT WINDS AND CLEAR SKIES ASSOCIATED WITH A RIDGE OF HIGH
PRESSURE ALLOWED TEMPERATURES TO DROP INTO THE UPPER 20S AND 30S
ACROSS MUCH OF THE AREA OVERNIGHT. THIS RESULTED IN A FROSTY
MORNING FOR LOCATIONS AWAY FROM LAKE MICHIGAN AND LAKE WINNEBAGO.
WV IMAGERY SHOWED A POTENT UPPER TROUGH MOVING INTO THE WESTERN
DAKOTAS. THIS SYSTEM WILL BRING THE NEXT ROUND OF RAIN LATER
THIS AFTERNOON AND TONIGHT.
THE UPPER TROUGH AND AN ASSOCIATED COLD FRONT WILL SWEEP ACROSS
THE FORECAST AREA LATE THIS AFTERNOON AND EVENING, BRINGING
WIDESPREAD LIGHT TO MODERATE RAINFALL. THE RAIN WILL PULL OUT OF
FAR NE WI OVERNIGHT, WITH A SHORT BREAK IN THE PRECIPITATION
BEFORE SHOWERS REDEVELOP WITH THE ARRIVAL OF AN UPPER LEVEL LOW
ON TUESDAY. CYCLONIC WNW FLOW, ADDITIONAL SHORT-WAVES WRAPPING
AROUND THE SLOWLY DEPARTING UPPER LOW, AND LOW PRESSURE TRACKING
JUST NORTHEAST OF THE STATE (TUESDAY NIGHT) WILL PRODUCE PERIODIC
SHOWERS THROUGH MIDWEEK, ALONG WITH BLUSTERY CONDITIONS AND BELOW
NORMAL TEMPERATURES (HIGHS IN THE 40S AND LOWER 50S). SCATTERED
LAKE-EFFECT SHOWERS MAY LINGER OVER NORTH CENTRAL WI AND NORTHERN
DOOR COUNTY INTO THURSDAY.
HIGH PRESSURE BRINGS DRIER CONDITIONS AND NEAR NORMAL TEMPERATURES
FOR THE END OF THE WEEK.
AVIATION
FOR 18Z TAF ISSUANCE
ISSUED AT 1201 PM CDT MON OCT 20 2025
VFR CONDITIONS ARE EXPECTED THIS AFTERNOON, WITH INCREASING
HIGH/MID CLOUDS. CLOUDS WILL LOWER LATE THIS AFTERNOON AND
EVENING, AS A BAND OF LIGHT TO MODERATE RAIN SPREADS EAST ACROSS
THE REGION. THE RAIN SHOULD ONLY LAST 4 OR 5 HOURS AT ANY GIVEN
LOCATION. MVFR CONDITIONS MAY ACCOMPANY THE RAIN, AND THE LOWER
CEILINGS MAY LINGER FOR A WHILE ACROSS NORTHERN WI OVERNIGHT.
PARTIAL CLEARING SHOULD OCCUR IN CENTRAL AND EAST CENTRAL WI LATE.
A SHORTWAVE WILL BRING CLOUDS BACK INTO THE REGION FROM WEST TO
EAST ON TUESDAY ALONG WITH ADDITIONAL SHOWERS. CIGS COULD FALL TO
MVFR AT TIMES WITH THE SHOWERS ON WEDNESDAY. THE SHOWERS AND
CLOUDS WILL AFFECT THE CENTRAL AND NORTH-CENTRAL TAF SITES TUESDAY
MORNING, AND THE REST OF THE TAF SITES TUESDAY AFTERNOON.
SOUTHERLY WINDS, WITH GUSTS TO 25 KNOTS, ARE EXPECTED THIS
AFTERNOON. WINDS WILL SHIFT TO THE SOUTHWEST/WEST THIS EVENING AS
A COLD FRONT MOVES THROUGH AND REMAIN WESTERLY ON WEDNESDAY.
POCKETS OF LLWS WILL DEVELOP THIS EVENING, AND IMPACT ALL OF THE
TAF SITES, BEFORE DIMINISHING LATER THIS EVENING.
GRB WATCHES/WARNINGS/ADVISORIES
NONE.
DISCUSSION.....KIECKBUSCH
AVIATION.......KURIMSKI
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