310
FXUS63 KGRR 060554
AFDGRR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
154 AM EDT SUN SEP 6 2026
KEY MESSAGES
- FAIR WEATHER THROUGH LABOR DAY
- CHANCE FOR SHOWERS AND THUNDERSTORMS TUESDAY AND WEDNESDAY
DISCUSSION
ISSUED AT 157 PM EDT SAT SEP 5 2026
- FAIR WEATHER THROUGH LABOR DAY
AN OMEGA BLOCK DEVELOPS ACROSS THE CONUS THIS WEEKEND AS THE
CENTRAL U.S. UPPER HIGH IS BOOKENDED BY CUT OFF LOWS ACROSS THE
NE AND NW CONUS. THIS LOWERS HEIGHTS ACROSS THE CENTRAL GREAT
LAKES AND ALLOWS SURFACE HIGH PRESSURE RIDGE TO BUILD IN FROM THE
NORTHEAST WITH LOWER TEMPERATURES AND DEW POINTS. SHOWERS END THIS
AFTERNOON AND CLEARING PUSHED SOUTH THIS EVENING WITH IT BECOMING
NOTICEABLY COOLER OVERNIGHT. MORNING LOWS ON SUNDAY AND MONDAY
EXPECTED TO BE IN THE UPPER 40S TO LOWER 50S ACROSS THE NORTHERN
FORECAST AREA.
- CHANCE FOR SHOWERS AND THUNDERSTORMS TUESDAY AND WEDNESDAY
THE SURFACE HIGH RETREATS EAST EASTWARD BY TUESDAY. THE OMEGA
BLOCK BREAKS DOWN AS A LOW ACROSS THE PACIFIC NW KICKS EAST AND
FLATTENS THE UPPER HIGH, WITH SURFACE LOW PRESSURE TRACKING ACROSS
SOUTHERN CANADA. RETURN FLOW OF MOISTURE AND A SURFACE WARM FRONT
SHOULD KICK OFF SOME SHOWERS AND THUNDERSTORMS LATE TUESDAY INTO
WEDNESDAY. ANOTHER ROUND OF STORMS WILL BE POSSIBLE AS A COLD
FRONT MOVES THROUGH LATE WEDNESDAY AND SHEAR PROFILES SUGGEST
STRONG STORMS ARE POSSIBLE IF INSTABILITY IS SUFFICIENT.
AVIATION /06Z TAFS THROUGH 06Z MONDAY/
ISSUED AT 151 AM EDT SUN SEP 6 2026
SKIES ARE GENERALLY CLEAR ACROSS THE REGION. NORTHEAST WINDS ARE
ADVECTING DRIER AIR IN FROM CANADA. JXN HAS ALREADY DROPPED TO 2SM
BR, BUT BOUNCED BACK TO VFR. THIS WILL LIKELY HAPPEN A FEW MORE
TIMES OVERNIGHT. IT'S POSSIBLE THAT OTHER TERMINALS MAY DROP TO
MVFR IN FOG TOO, BUT CONFIDENCE WAS LOW ENOUGH TO OMIT FROM THE
TAFS. SINCE JXN WAS ALREADY IFR, WE KEPT IT IN THE TAF. ONCE THE
FOG BURNS OFF SHORTLY AFTER SUNRISE, VFR CONDITIONS ARE EXPECTED
THE REST OF THE DAY AS HIGH PRESSURE BUILDS INTO THE REGION.
MARINE
ISSUED AT 157 PM EDT SAT SEP 5 2026
LIGHT OFFSHORE WINDS, GENERALLY LESS THAN 15 KNOTS, CAN BE
EXPECTED THROUGH MONDAY. HIGH PRESSURE WILL MOVE EAST ON TUESDAY
AND WINDS WILL BE ON THE INCREASE, WITH A SMALL CRAFT ADVISORY
PROBABLY BEING NEEDED FOR TUESDAY AND WEDNESDAY.
GRR WATCHES/WARNINGS/ADVISORIES
MI...NONE.
MARINE...NONE.
DISCUSSION...OSTUNO
AVIATION...04
MARINE...OSTUNO
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