149
FXUS63 KGRR 110538
AFDGRR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
138 AM EDT FRI SEP 11 2026
KEY MESSAGES
- LOW CHANCE OF RAIN ON SATURDAY
- SHOWERS AND THUNDERSTORMS POSSIBLE LATE MONDAY INTO TUESDAY
DISCUSSION
ISSUED AT 138 AM EDT FRI SEP 11 2026
- LOW CHANCE OF RAIN ON SATURDAY
SURFACE HIGH PRESSURE MOVES EAST ON SATURDAY AND RETURN FLOW
BRINGS SOME MOISTURE. THERE COULD BE A FEW SHOWERS ON SATURDAY
AND SATURDAY NIGHT. THERE IS ENOUGH ENSEMBLE SUPPORT TO BUMP UP
NBM POPS FROM AROUND ZERO TO SLIGHT/LOW CHANCE ACROSS THE NORTHERN
ZONES WHERE THE BETTER MOISTURE AND LIFT IS LOCATED.
- SHOWERS AND THUNDERSTORMS POSSIBLE LATE MONDAY INTO TUESDAY
A SHORTWAVE TROUGH EJECTS OUT OF THE NORTHERN ROCKIES WITH A
SURFACE LOW TRACKING INTO CANADA EARLY NEXT WEEK. A TRAILING COLD
FRONT IS EXPECTED TO TOUCH OFF SHOWERS AND THUNDERSTORMS MONDAY
NIGHT AND TUESDAY. INSTABILITY AND DEEPER MOISTURE IS ACROSS
NORTHERN LOWER MICHIGAN POOLING AHEAD OF THE COLD FRONT, WHICH
SINKS SOUTH THROUGH THE FORECAST AREA ON TUESDAY. PRECIPITABLE
WATER SURGES CLOSE 2 INCHES, SO HEAVY RAIN POTENTIAL IS THERE AS
THE FRONT WILL BE MOVING SLOWLY AND MBE VECTORS ARE LESS THAN 10
KNOTS.
THE FRONT STALLS ACROSS THE SOUTHERN ZONES ON WEDNESDAY, WITH A
RAINY STRETCH OF WEATHER POSSIBLE THROUGH THURSDAY AS A SURFACE
LOW TRACKS ALONG THE FRONT ACROSS SOUTHERN LOWER MICHIGAN.
AVIATION /06Z TAFS THROUGH 06Z SATURDAY/
ISSUED AT 138 AM EDT FRI SEP 11 2026
IFR CONDITIONS EXPECTED TO PREVAIL THROUGH FRIDAY EVENING. THE
EXCEPTION COULD BE SOME SHALLOW GROUND FOG THAT COULD BRING PATCHY
IFR CONDITIONS. ONLY JXN TAF HAS THIS INCLUDED AS A TEMPO GROUP
BUT THE FOG IS ALSO POSSIBLE AT OTHER SITES. WINDS WILL BE LIGHT
AS HIGH PRESSURE IS CENTERED OVER LOWER MICHIGAN.
MARINE
ISSUED AT 138 AM EDT FRI SEP 11 2026
WINDS AND WAVES WILL INCREASE SATURDAY AHEAD OF A COLD FRONT AND
A SMALL CRAFT ADVISORY MAY BE NEEDED. STRONGER WINDS ARE EXPECTED
EARLY NEXT WEEK AND GALES ARE POSSIBLE BY MONDAY NIGHT AND
TUESDAY.
GRR WATCHES/WARNINGS/ADVISORIES
MI...NONE.
MARINE...NONE.
DISCUSSION...OSTUNO
AVIATION...OSTUNO
MARINE...OSTUNO
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page