920
FXUS63 KGRR 262225
AFDGRR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
625 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 /00Z TAFS THROUGH 00Z TUESDAY/
ISSUED AT 625 PM EDT SUN APR 26 2026
LITTLE IMPACT TO AVIATION EXPECTED THROUGH MID MORNING MONDAY AS
PREDOMINANTLY MID/HIGH CLOUDS AND WINDS AROUND 10 KNOTS OR LESS
ARE EXPECTED. AFTER AROUND 13Z WIND GUSTS INCREASE TO AROUND 25
KNOTS FROM THE SOUTHEAST WHERE THEY REMAIN THROUGH THE DAY. AFTER
19Z, A WEAKENING LINE OF SHOWERS WITH THE POTENTIAL FOR ISOLATED
THUNDERSTORMS WILL MOVE ACROSS THE TERMINALS. GIVEN THE WEAKENING
TREND WITH EASTERN EXTENT, HAVE LIMITED MKG TO PREVAILING
SHOWERS AT PRESENT GOING VCSH AT THE OTHER TERMINALS. LOWERING
CIGS ARE EXPECTED BUT LIKELY TO REMAIN VFR. THE NEXT ROUND OF
SHOWERS AND STORMS IS FORECAST TO ARRIVE AFTER 00Z.
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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