418
FXUS63 KGRR 061735
AFDGRR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
135 PM EDT WED AUG 6 2025
KEY MESSAGES
- QUIET WEATHER THIS WEEK
DISCUSSION
ISSUED AT 150 AM EDT WED AUG 6 2025
- QUIET WEATHER THIS WEEK
THE SURFACE HIGH THAT HAS DOMINATED THE WEATHER THE PAST FEW DAYS
SLOWLY MOVES EAST AND ALLOWS SOME MOISTURE RETURN IN SOUTHEAST
LOW LEVEL FLOW TODAY. WE WILL SEE ISOLATED AFTERNOON SHOWERS OR
THUNDERSTORMS AGAIN TODAY BUT THESE WILL ONCE AGAIN BE VERY
LIMITED WITH COVERAGE LESS THAN 10 PERCENT OF THE FORECAST AREA.
DEEP MOISTURE CONTINUES TO GRADUALLY INCREASE AS THE FLOW GOES
SOUTHERLY INTO THE WEEKEND. SHOWERS AND STORMS ALONG A WEAK
SURFACE TROUGH ARE POSSIBLE THURSDAY INTO FRIDAY, BUT UPPER
RIDGING SHOULD LIMIT COVERAGE OF ANY POTENTIAL CONVECTION.
MORE WIDESPREAD SHOWERS COULD BE IN THE OFFING FOR EARLY NEXT
WEEK AS A SHORTWAVE TROUGH FLATTENS THE HEAT RIDGE AND DRIVES A
COLD FRONT/SFC TROUGH THROUGH THE GREAT LAKES BY TUESDAY.
AVIATION /18Z TAFS THROUGH 18Z THURSDAY/
ISSUED AT 135 PM EDT WED AUG 6 2025
SCATTERED / AREAS OF BROKEN CUMULUS CLOUD BASES BETWEEN 4,000 AND
6,000 FEET THROUGH SUNSET TODAY. SCATTERED SHOWERS ARE DEVELOPING
EAST OF LAN/JXN, INCLUDING A THUNDERSTORM CELL IN VICINITY OF
DETROIT. HREF MODELS INDICATE 30 PERCENT POTENTIAL FOR SHOWERS
LATER THIS AFTERNOON TO AFFECT LAN AND JXN. ANY HEAVIER SHOWERS
COULD HAVE LOWERED VISIBILITY UNDER MODERATE RAIN, AND SOME
LOCALIZED LLWS DUE TO WEAK-MODERATE DOWNDRAFTS. SOME MIST/FOG
POTENTIAL AGAIN TONIGHT BETWEEN 09 AND 13 Z, THOUGH IT APPEARS
LESS OF A THREAT THAN LAST NIGHT AS THERE MAY BE VARIOUS VFR CLOUD
LAYERS PRESENT.
MARINE
ISSUED AT 150 AM EDT WED AUG 6 2025
OFFSHORE WINDS WILL CONTINUE THROUGH TONIGHT WHICH WILL LIMIT
WAVES TO A FOOT OR LESS. SOUTH WINDS INCREASE ON THURSDAY AND INTO
THE WEEKEND WITH WAVES SLOWLY INCREASING AS WELL.
GRR WATCHES/WARNINGS/ADVISORIES
MI...NONE.
MARINE...NONE.
DISCUSSION...OSTUNO
AVIATION...CAS
MARINE...OSTUNO
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