729
FXUS63 KGRB 200900
AFDGRB
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREEN BAY WI
400 AM CDT MON OCT 20 2025
FORECAST DISCUSSION FOR ROUTINE MORNING FORECAST 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 06Z TAF ISSUANCE
ISSUED AT 1051 PM CDT SUN OCT 19 2025
VFR CONDITIONS ARE EXPECTED OVERNIGHT INTO MOST OF MONDAY. CLEAR
SKIES WILL PREVAIL LATE THIS EVENING, THEN MID AND HIGH CLOUDS
WILL INCREASE ON OVERNIGHT INTO MONDAY. CLOUDS WILL LOWER MONDAY
AFTERNOON AND EVENING, AS AN AREA OF RAIN SHOWERS QUICKLY SPREADS
WEST TO EAST ACROSS THE REGION, IMPACTING THE TAF SITES MAINLY
BETWEEN 21Z MONDAY AND 06Z TUESDAY. SOME MVFR, POSSIBLY IFR,
CONDITIONS ARE EXPECTED WITH THE HEAVIER SHOWER ACTIVITY.
WINDS WILL BE LIGHT OVERNIGHT, THEN SHIFT TO THE SOUTH ON MONDAY
INCREASE IN THE MORNING, WITH GUSTS TO ~30 KTS BY LATE MORNING,
WITH A FEW GUSTS TO 35 KTS POSSIBLE DURING THE AFTERNOON. WINDS
WILL SHIFT TO THE SOUTHWEST/WEST MONDAY EVENING AND BE A LITTLE
LESS GUSTY, BUT GUSTS TO ~20 KTS WILL STILL REMAIN POSSIBLE.
GRB WATCHES/WARNINGS/ADVISORIES
FROST ADVISORY UNTIL 8 AM CDT THIS MORNING FOR WIZ020-030-031-
035>039-045-048-049-073-074.
DISCUSSION.....KIECKBUSCH
AVIATION.......BERSCH
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