567
FXUS63 KGRR 300727
AFDGRR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
327 AM EDT SAT AUG 30 2025
KEY MESSAGES
- NEXT CHANCE FOR RAIN LATE WEDNESDAY
DISCUSSION
ISSUED AT 327 AM EDT SAT AUG 30 2025
- NEXT CHANCE FOR RAIN LATE WEDNESDAY
SURFACE HIGH DOMINATES THE GREAT LAKES THROUGH THE FIRST HALF OF
NEXT WEEK WITH UPPER HEIGHT RISES BRINGING SLOWLY MODERATING
TEMPERATURES. THE WARMING WILL BE BRIEF HOWEVER AS ANOTHER UPPER
LOW DIVES SOUTHEAST FROM CANADA AND CARVES OUT A LONGWAVE TROUGH
ACROSS THE CENTRAL AND EASTERN CONUS BY LATE IN THE WEEK. MOISTURE
STREAMING UP FROM THE SOUTH WILL CONVERGE WITH THE TROUGH AXIS
AND A SURFACE LOW TRAILING A COLD FRONT BY WEDNESDAY NIGHT WITH
SHOWERS AND A FEW THUNDERSTORMS POSSIBLE.
DIURNALLY DRIVEN SHOWERS WITH SOME LAKE ENHANCEMENT ARE POSSIBLE
ON THURSDAY THROUGH THE END OF THE WEEK WITH SHORTWAVE TROUGHS AND
VORTICITY MAXIMA ROTATING AROUND THE UPPER LOW IN BROAD CYCLONIC
FLOW REGIME ALONG WITH STEEP MID LEVEL LAPSE RATES.
AVIATION /06Z TAFS THROUGH 06Z SUNDAY/
ISSUED AT 124 AM EDT SAT AUG 30 2025
VFR CONDITIONS WILL PREVAIL EXCEPT FOR AREAS OF SHALLOW GROUND FOG
OVERNIGHT WHICH WILL ALSO BE ENHANCED BY "STEAM FOG" IN MARSHY
AREAS OR NEAR BODIES OF WATER BEFORE SUNRISE. WINDS ARE EXPECTED
TO REMAIN BEAR CALM OR 5 KNOTS OR LESS THROUGH SATURDAY NIGHT.
MARINE
ISSUED AT 124 AM EDT SAT AUG 30 2025
RELATIVELY CALM CONDITIONS EXPECTED FOR THE NEARSHORE WATERS
THROUGH EARLY NEXT WEEK AS HIGH PRESSURE DOMINATES THE GREAT LAKES
REGION. WATER AND AIR TEMPERATURES WILL REMAIN RATHER COOL FOR
SWIMMING.
GRR WATCHES/WARNINGS/ADVISORIES
MI...FROST ADVISORY UNTIL 8 AM EDT THIS MORNING FOR MIZ039-040.
MARINE...NONE.
DISCUSSION...OSTUNO
AVIATION...OSTUNO
MARINE...OSTUNO
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