986
FXUS63 KGRR 121740
AFDGRR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
140 PM EDT FRI SEP 12 2025
KEY MESSAGES
- CHANCE OF RAIN SATURDAY
DISCUSSION
ISSUED AT 137 AM EDT FRI SEP 12 2025
- CHANCE OF RAIN SATURDAY
OVERALL DRY PATTERN CONTINUES INTO NEXT WEEK WITH ONLY A CHANCE
OF SHOWERS SATURDAY MORNING. CONVECTION FORMS ON THE NOSE OF A LLJ
ACROSS WISCONSIN LATE FRIDAY NIGHT AND TRANSLATES SOUTHEAST
ACROSS LOWER MICHIGAN SATURDAY MORNING WHILE SLOWLY DISSIPATING
AS THE LLJ WEAKENS. QPF AND POPS ARE LOWERED A BIT FROM YESTERDAY.
INSTABILITY AND SHEAR PROFILES SUGGEST THUNDER CHANCES ARE
ISOLATED AT BEST.
THE MAJORITY OF THE NEXT SEVERAL DAYS WILL SEE SFC HIGH PRESSURE
EDGING DOWN FROM CANADA WITH DRY NORTH OR NORTHEAST FLOW. GULF
MOISTURE REMAINS EFFECTIVELY CUT OFF INTO NEXT WEEK. IT MAY BE THE
END OF NEXT WEEK BEFORE THE NEXT CHANCE OF ANY RAIN APPEARS.
AVIATION /18Z TAFS THROUGH 18Z SATURDAY/
ISSUED AT 140 PM EDT FRI SEP 12 2025
VFR CONDITIONS ARE EXPECTED THROUGH THE TAF PERIOD WITH LIGHT AND
VARIABLE WINDS BECOMING MORE SOUTHWESTERLY SATURDAY MORNING. CLOUD
COVER WILL INCREASE OVERNIGHT INTO FRIDAY MORNING WITH CEILINGS
DROPPING TO AROUND 10000 FEET BY THE AFTERNOON. AN AREA OF SHOWERS
AND A FEW THUNDERSTORMS WILL BE POSSIBLE MAINLY FOR AREAS CLOSER
TO LAKE MICHIGAN AFTER 12Z TOMORROW. CONFIDENCE IS LOWER FURTHER
INLAND. IF SHOWERS DO OCCUR THEY LOOK TO CLEAR BY 00Z SUNDAY.
MARINE
ISSUED AT 140 PM EDT FRI SEP 12 2025
OVERALL LIGHT WINDS AND LOW WAVE HEIGHTS ARE EXPECTED THROUGH MOST
OF NEXT WEEK. THE ONLY CHANCE FOR SHOWERS AND MAYBE A FEW RUMBLES
OF THUNDER WILL BE SATURDAY MORNING AND AFTERNOON.
GRR WATCHES/WARNINGS/ADVISORIES
MI...NONE.
MARINE...NONE.
DISCUSSION...OSTUNO
AVIATION...RAH
MARINE...RAH
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