608
FXUS63 KGRR 050558
AFDGRR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
158 AM EDT FRI SEP 5 2025
KEY MESSAGES
- STRONG WINDS LATE TONIGHT THROUGH FRIDAY MORNING
- COOL WITH ANOTHER CHANCE FOR RAIN SATURDAY
DISCUSSION
ISSUED AT 230 PM EDT THU SEP 4 2025
- STRONG WINDS LATE TONIGHT THROUGH FRIDAY MORNING
THE FAST MOVING UPPER LEVEL LOW WILL MOVE THROUGH THE UPPER
MIDWEST AND THROUGH NORTHERN MICHIGAN TONIGHT THROUGH FRIDAY
MORNING. THE BIGGEST CONCERN REMAINS THE POTENTIAL FOR 40 MPH OR
MORE WINDS. THERE WILL BE A STRONG CORE OF WIND ALOFT. THE
QUESTION IS WHETHER THAT WEATHER WILL MIX TO THE SURFACE. THE HREF
MEAN 925 MB (APPROX 1500 FEET) SOUTHWESTERLY WINDS PEAK AROUND
40-45 KNOTS OVER OUR AREA BETWEEN 5 AM AND 10 AM. THERE REMAINS
THE POTENTIAL FOR GUSTY WINDS BUT THE VARIABILITY IN STABILITY
WILL MEAN WE WILL HOLD OFF ON ANY HEADLINES FOR NOW. WHILE THERE
WILL BE SOME RAINFALL ASSOCIATED WITH THIS SYSTEM IT WILL BE
AROUND A QUARTER OF AN INCH.
- COOL WITH ANOTHER CHANCE FOR RAIN SATURDAY
COOLER AIR WILL FILTER IN BEHIND THIS FRONT WITH ANOTHER FRONT
MOVING THROUGH SATURDAY. THAT WILL ALLOW FOR LOWS INTO THE 40S.
THAT WEAK SYSTEM WILL MOVE THROUGH LATE SATURDAY INTO SUNDAY,
BRINGING ANOTHER CHANCE FOR SHOWERS WITH GUSTY WINDS, ALBEIT
WEAKER THAN FRIDAY'S, POSSIBLE SATURDAY AFTERNOON
AVIATION /00Z TAFS THROUGH 00Z SATURDAY/
ISSUED AT 158 AM EDT FRI SEP 5 2025
BIGGEST AVIATION CONCERN OVERNIGHT WILL BE THE FRONT. EXPECT WIND
SHEAR BETWEEN 08Z TO 14Z WEST TO EAST. THERE IS SOME CONCERN THAT
SOME OF THESE HIGHER WINDS WILL MIX TO THE SURFACE. HOWEVER, GIVEN
THE UNCERTAINTY HAVE LEFT WIND GUSTS AT 30KTS.
A PERIOD OF MVFR CIGS IS POSSIBLE AT MKG MID TO LATE MORNING.
GUSTY WINDS WILL CONTINUE THROUGH THIS AFTERNOON AND EARLY
EVENING BEFORE DIMINISHING THIS EVENING.
MARINE
ISSUED AT 335 PM EDT THU SEP 4 2025
DANGEROUS WINDS AND WAVES THIS AFTERNOON AND EVENING WILL INCREASE
IN INTENSITY EARLY FRIDAY. GALES OF 40KTS OR HIGHER ARE EXPECTED
FOR ALL MARINE ZONES OVERNIGHT TONIGHT WITH WAVES OF MORE THAN 10
FEET EXPECTED AT TIMES. SOME IMPROVEMENT IN CONDITIONS LATE
FRIDAY BUT HAZARDOUS WINDS AND WAVES TO SMALL CRAFT AND SWIMMERS
SHOULD PERSIST INTO SATURDAY.
GRR WATCHES/WARNINGS/ADVISORIES
MI...BEACH HAZARDS STATEMENT THROUGH SATURDAY MORNING FOR MIZ037-043-
050-056-064-071.
MARINE...SMALL CRAFT ADVISORY UNTIL 2 AM EDT EARLY THIS MORNING FOR
LMZ844>849.
GALE WARNING UNTIL 11 AM EDT THIS MORNING FOR LMZ844>849.
DISCUSSION...CERU
AVIATION...CERU
MARINE...MACZKO
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