596
FXUS63 KGRR 261835
AFDGRR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
235 PM EDT SUN APR 26 2026
KEY MESSAGES
- RAIN AND THUNDERSTORMS MONDAY AFTERNOON INTO MONDAY NIGHT
- COOLER AND MAINLY DRY TUESDAY THROUGH SATURDAY
DISCUSSION
ISSUED AT 235 PM EDT SUN APR 26 2026
- RAIN AND THUNDERSTORMS MONDAY AFTERNOON INTO MONDAY NIGHT
OVERALL DRY CONDITIONS ARE EXPECTED INTO EARLY MONDAY AFTERNOON. A
DECAYING LINE OF THUNDERSTORMS MOVES IN FROM THE SOUTHWEST DURING
THE LATE AFTERNOON. INSTABILITY AND LIFT WILL BE LIMITED OVER THE
AREA. THIS INITIAL ROUND OF RAIN AHEAD OF OUR EVENING ROUND COULD
IMPACT OUR MARGINAL SEVERE RISK. WE'LL HAVE PLENTY OF SHEAR WITH THE
LOW AND MID LEVEL JET, BUT INSTABILITY IS LACKING. HREF KEEPS VALUES
BELOW 1000 J/KG AND DOESN'T BRING IN THE BETTER INSTABILITY UNTIL
THE LINE OF SHOWERS AND THUNDERSTORMS IS ALREADY THROUGH THE
AREA. THIS TIMING DIFFERENCE REALLY LIMITS THE POTENTIAL FOR ANY
STRONGER STORMS. THE BEST WINDOW FOR ANY STRONG TO SEVERE STORMS
WOULD BE BETWEEN 8PM MONDAY AND 2AM TUESDAY. WIND WOULD BE THE
PRIMARY CONCERN LARGELY SOUTH OF I-96 WITH THE BEST CHANCES IN FAR
SOUTHWEST MICHIGAN. THIS AREA IS CONSISTENT BETWEEN THE NCAR,
GEFS, NSSL, NADOCAST, AND SPC OUTLOOKS.
- COOLER AND MAINLY DRY TUESDAY THROUGH SATURDAY
WE'LL REMAIN UNDER TROUGHING THROUGH MOST OF THE WEEK BRINGING
COOLER TEMPERATURES TO THE REGION. A COUPLE SHORTWAVE TROUGHS MAY
SPARK OFF SHOWERS TUESDAY NIGHT INTO WEDNESDAY AND THURSDAY NIGHT
INTO FRIDAY. HIGH TEMPERATURES WILL LARGELY BE IN THE 50S WITH LOWS
IN THE 30S. FROST WILL BE POSSIBLE STARTING WEDNESDAY NIGHT. BE
PREPARED TO TAKE CARE OF ANY SENSITIVE VEGETATION DURING THIS PERIOD
OF COLDER TEMPERATURES.
AVIATION /18Z TAFS THROUGH 18Z MONDAY/
ISSUED AT 113 PM EDT SUN APR 26 2026
VFR CONDITIONS ARE EXPECTED THROUGH THE TAF PERIOD AS EARLIER LOW
CLOUDS HAVE BURNED OFF. HIGH PRESSURE AND A LACK OF LOW-LEVEL
MOISTURE WILL LIMIT CLOUD COVER TO MID AND HIGH CLOUDS OVER THE
NEXT 24 HOURS. WINDS WILL BE FROM THE SOUTHEAST THROUGH THE TAF
PERIOD, WITH GUSTS TO 25 KNOTS EXPECTED STARTING MID TO LATE
MONDAY MORNING.
MARINE
ISSUED AT 235 PM EDT SUN APR 26 2026
SOUTHEAST WINDS BUILD TONIGHT INTO MONDAY WITH GUSTS 25 TO 30 KNOTS
MONDAY MORNING. SMALL CRAFT ADVISORY CONDITIONS ARE THEN EXPECTED TO
CONTINUE INTO TUESDAY WITH WINDS BECOMING MORE WESTERLY. WAVE
HEIGHTS BUILD TO 4 TO 8 FEET MONDAY NIGHT AS THE WINDS SHIFT TO
THE SOUTHWEST. THUNDERSTORMS WILL ALSO BE POSSIBLE LATE MONDAY
AFTERNOON INTO MONDAY NIGHT.
WINDS AND WAVES WILL THEN SUBSIDE TUESDAY AFTERNOON AND REMAIN BELOW
SMALL CRAFT ADVISORY CONDITIONS THROUGH THE REST OF THE WEEK.
GRR WATCHES/WARNINGS/ADVISORIES
MI...NONE.
MARINE...SMALL CRAFT ADVISORY FROM 8 AM MONDAY TO 6 PM EDT TUESDAY FOR
LMZ844>849.
DISCUSSION...RAH
AVIATION...THOMAS
MARINE...RAH
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