410
FXUS63 KGRR 091101
AFDGRR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
701 AM EDT SAT MAY 9 2026
KEY MESSAGES
- THUNDERSTORMS SE LOWER MICHIGAN THIS AFTERNOON
- FROST/FREEZE THE NEXT THREE NIGHTS
DISCUSSION
ISSUED AT 228 AM EDT SAT MAY 9 2026
- THUNDERSTORMS SE LOWER MICHIGAN THIS AFTERNOON
A COLD FRONT PUSHES THROUGH TODAY WITH MODEST MOISTURE AND
INSTABILITY ACROSS THE SOUTHEAST FORECAST AREA TO INITIATE A LINE
OF STORMS IN THE AFTERNOON. HIGH RESOLUTION CAMS SHOW MOST OF THE
HEAVIER STORMS WILL MOVES SOUTH AND EAST OF INGHAM TO JACKSON
COUNTIES, BUT IT WILL BE A CLOSE CALL. THE THREAT SHOULD END AS
THE COLD FRONT CLEARS THE AREA BY 5 PM.
- FROST/FREEZE THE NEXT THREE NIGHTS
COOL HIGH PRESSURE BUILDS IN FOR TONIGHT WITH CLEARING SKIES AND
DIMINISHING WINDS. THIS WILL ALLOW GOOD RADIATIONAL COOLING
CONDITIONS AND ANOTHER NIGHT OF FROST AND FREEZING TEMPERATURES
FOR THE NORTHERN FORECAST AREA. A FREEZE WARNING AND FROST
ADVISORY HAS BEEN ISSUED FOR THAT AREA. SUNDAY AND MONDAY NIGHTS
WILL BE EVEN COLDER WITH AN EXPECTED EXPANSION OF THE FROST/FREEZE
HEADLINES FOR MOST OR ALL OF THE FORECAST AREA. LOW PRESSURE
WILL BRING RAIN ON TUESDAY AS A CLIPPER TYPE LOW MOVES THROUGH IN
FAST NORTHWEST FLOW REGIME.
AVIATION /12Z TAFS THROUGH 12Z SUNDAY/
ISSUED AT 701 AM EDT SAT MAY 9 2026
LOW STRATUS WILL BRING PATCHY IFR AND LIFR EARLY THIS MORNING
ACROSS SOUTHERN LOWER MICHIGAN. OTHERWISE, VFR CONDITIONS WILL
CONTINUE INTO SUNDAY MORNING. SOUTH WINDS COULD GUST TO 20 KNOTS
AT TIMES THIS AFTERNOON. THERE IS A LOW CHANCE OF THUNDERSTORMS
NEAR JXN LATE THIS AFTERNOON BUT THE CHANCES ARE LOW ENOUGH TO
KEEP OUT OF THE FORECAST FOR NOW.
MARINE
ISSUED AT 228 AM EDT SAT MAY 9 2026
WINDS AND WAVES WILL INCREASE LATE TONIGHT AND MARGINAL SCA
CONDITIONS ARE EXPECTED THIS MORNING AHEAD OF THE ADVANCING COLD
FRONT. WINDS AND WAVES WILL DECREASE THIS AFTERNOON AS HIGH
PRESSURE BUILDS IN AND REMAIN FAIRLY LIGHT UNTIL TUESDAY WHEN THE
HIGH MOVES EAST AND SOUTH WINDS INCREASE.
GRR WATCHES/WARNINGS/ADVISORIES
MI...FROST ADVISORY FROM 2 AM TO 8 AM EDT SUNDAY FOR MIZ037-043>046.
FREEZE WARNING FROM 2 AM TO 8 AM EDT SUNDAY FOR MIZ038>040.
MARINE...SMALL CRAFT ADVISORY UNTIL 1 PM EDT THIS AFTERNOON FOR
LMZ844>849.
DISCUSSION...OSTUNO
AVIATION...OSTUNO
MARINE...OSTUNO
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