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FXUS63 KGRR 291748
AFDGRR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
148 PM EDT FRI AUG 29 2025
KEY MESSAGES
- FAIR AND COOL WEEKEND
- NEXT CHANCE FOR RAIN IS WEDNESDAY
DISCUSSION
ISSUED AT 320 AM EDT FRI AUG 29 2025
- FAIR AND COOL WEEKEND
SURFACE HIGH PRESSURE BUILDS OVER THE CENTRAL GREAT LAKES OVER THE
WEEKEND WITH DRY AND COOL WEATHER. LOWS TONIGHT WILL AGAIN FALL
INTO THE UPPER 30S ACROSS THE INTERIOR COLD HOLLOWS WITH 40S
ELSEWHERE. THERE WILL BE A SLOW MODIFICATION OF TEMPERATURES
THROUGH EARLY NEXT WEEK.
- NEXT CHANCE FOR RAIN IS WEDNESDAY
AFTER A BRIEF PERIOD OF UPPER HEIGHT RISES AND RIDGING EARLY NEXT
WEEK, ANOTHER UPPER LOW DIVES SOUTHEAST FROM CANADA AND CARVES
OUT A LONGWAVE TROUGH ACROSS THE CENTRAL AND EASTERN CONUS BY LATE
IN THE WEEK. THE TROUGH AXIS AND A SURFACE LOW TRAILING A COLD
FRONT MOVES THROUGH ON WEDNESDAY INTO THURSDAY WITH SHOWERS AND
POSSIBLY THUNDERSTORMS BY WEDNESDAY AFTERNOON. DIURNALLY DRIVEN
SHOWERS WITH SOME LAKE ENHANCEMENT ARE POSSIBLE ON THURSDAY INTO
FRIDAY WITH THE UPPER LOW PROVIDING STEEP MID LEVEL LAPSE RATES.
AVIATION /18Z TAFS THROUGH 18Z SATURDAY/
ISSUED AT 148 PM EDT FRI AUG 29 2025
VFR PREVAILS THE REST OF THE DAY WITH SCATTERED TO BROKEN CUMULUS
CLOUDS AROUND 3,500 TO 4,500 FEET THROUGH SUNSET. LIGHT AND
VARIABLE WINDS OVERNIGHT, PERHAPS WITH PATCHY OR SHALLOW FOG
DEVELOPING IN SOME SPOTS BEFORE SUNRISE.
MARINE
ISSUED AT 320 AM EDT FRI AUG 29 2025
WINDS AND WAVES ARE DIMINISHING AND THE SMALL CRAFT ADVISORY AND
BEACH HAZARDS STATEMENT ARE CANCELLED. WAVES AND WINDS WILL
REMAIN RELATIVELY LIGHT THROUGH LABOR DAY. WATER TEMPERATURES IN
THE 50S CAN BE EXPECTED AS UPWELLING FOLLOWS A STRETCH OF NORTH TO
NORTHEAST WINDS.
GRR WATCHES/WARNINGS/ADVISORIES
MI...FROST ADVISORY FROM 2 AM TO 8 AM EDT SATURDAY FOR MIZ039-040.
MARINE...NONE.
DISCUSSION...OSTUNO
AVIATION...CAS
MARINE...OSTUNO
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