287
FXUS63 KGRR 112330
AFDGRR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
730 PM EDT FRI SEP 11 2026
KEY MESSAGES
- BREEZY SATURDAY WITH A SMALL CHANCE OF SHOWERS
- SHOWERS AND STORMS POSSIBLE TUESDAY THROUGH MIDWEEK
DISCUSSION
ISSUED AT 258 PM EDT FRI SEP 11 2026
- BREEZY SATURDAY WITH A SMALL CHANCE OF SHOWERS
NOT A WHOLE LOT OF CHANGE IN THE SHORT RANGE PATTERN. A MID LEVEL
TROUGH EMANATING FROM AN UPPER LEVEL LOW WILL SWING THROUGH THE
REGION TOMORROW. THIS WILL BRING STRONGER FLOW THROUGH NORTHERN
LOWER MICHIGAN SATURDAY AFTERNOON. A STRONGER GRADIENT WILL SET
UP. THAT GRADIENT WILL BRING GUSTY WINDS, 20 TO 30 MPH, TO THE
REGION WITH THE STRONGEST WINDS EXPECTED ALONG AND NORTH OF THE I
96 CORRIDOR. THE BEST MOISTURE WILL BE NORTH OF THE US 10 CORRIDOR
WITH ONLY A SMALL CHANCE OF SHOWERS SOUTHWARD.
- SHOWERS AND STORMS POSSIBLE TUESDAY THROUGH MIDWEEK
A SIGNIFICANT UPPER LEVEL SYSTEM WILL EJECT OUT OF THE NORTHERN
ROCKIES AND SWING THROUGH CANADA EARLY NEXT WEEK. LATEST MODEL
TRENDS SHOW THE COLD FRONT ASSOCIATED WITH THIS SYSTEM STALLS.
FRONTAL PASSAGE THROUGH THE GREAT LAKES SHOULD BE CLOSER TO
TUESDAY.
THIS SYSTEM WILL BRING BEST CHANCE FOR PRECIPITATION WITH
SHOWERS AND STORM POSSIBLE TUESDAY. THE FRONTAL PATTERN CONTINUES
TO SHOW THE POTENTIAL TO STALL WITH THE BOUNDARY DRAPING ACROSS
SOUTHERN MICHIGAN THROUGH IN AND IL. THAT STALLED FRONTAL
BOUNDARY, ITS ASSOCIATED MOISTURE AND THE FACT THAT THERE COULD BE
DECENT WARM AIR ADVECTION COULD BRING A PROLONGED PERIOD OF
SHOWER/STORM ACTIVITY MIDWEEK INTO THURSDAY.
AVIATION /00Z TAFS THROUGH 00Z SUNDAY/
ISSUED AT 726 PM EDT FRI SEP 11 2026
VFR CONDITIONS WILL DOMINATE THE PATTERN THROUGH THE FIRST HALF OF
OVERNIGHT PERIOD. WINDS HAVE SHIFTED TO THE SOUTH TO SOUTHEAST.
THIS WILL ALLOW FOR MORE POOLING OF MOISTURE OVERNIGHT. WINDS ARE
EXPECTED TO GO LIGHT AND VARIABLE OVERNIGHT. ANOTHER ROUND OF
SHALLOW GROUND FOG IS LIKELY AT THE SOUTHERN TAF SITES.
A STRONG INVERSION WILL ONCE AGAIN BE PRESENT AT JXN, AND AT AZO
AND BTL OVERNIGHT INTO SATURDAY MORNING. EXPECT MVFR TO IFR VSBYS
FORMING AROUND 08Z TO 10Z AND LIFTING BETWEEN 12Z TO 14Z. A
SYSTEM MOVING NORTHWARD LATE MORNING INTO THE AFTERNOON COULD
BRING IN SOME MID TO LOW CLOUDS TOMORROW.
WINDS SHOULD DECOUPLE AGAIN BECOMING LIGHT AFTER 22Z.
MARINE
ISSUED AT 258 PM EDT FRI SEP 11 2026
WINDS AND WAVES WILL INCREASE TOMORROW AHEAD THE APPROACHING COLD
FRONT. HAVE ISSUED A SMALL CRAFT ADVISORY AND A BEACH HAZARDS FOR
AREAS NORTH OF GRAND HAVEN. WINDS AND WAVES WILL SUBSIDE SATURDAY
NIGHT. STRONGER WINDS ARE EXPECTED NEXT WEEK AS ANOTHER SYSTEM
APPROACHES. GALES ARE POSSIBLE LATE MONDAY INTO TUESDAY.
GRR WATCHES/WARNINGS/ADVISORIES
MI...BEACH HAZARDS STATEMENT FROM SATURDAY MORNING THROUGH SATURDAY
EVENING FOR MIZ037-043-050.
MARINE...SMALL CRAFT ADVISORY FROM 8 AM TO 8 PM EDT SATURDAY FOR
LMZ847>849.
DISCUSSION...CERU
AVIATION...CERU
MARINE...CERU
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