530
FXUS63 KGRR 071723
AFDGRR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
123 PM EDT SUN JUN 7 2026
KEY MESSAGES
- NEXT CHANCE FOR THUNDERSTORMS MONDAY INTO TUESDAY
- HOT AND MIDWEEK WITH CHANCES (30-50 PERCENT) FOR THUNDERSTORMS
DISCUSSION
ISSUED AT 209 AM EDT SUN JUN 7 2026
- NEXT CHANCE FOR THUNDERSTORMS MONDAY INTO TUESDAY
HIGH PRESSURE TODAY WILL RESULT IN PLEASANT SUMMER WEATHER WITH
HIGHS IN THE UPPER 70S TO MID 80S. WINDS WILL BE LIGHT AND
VARIABLE BEFORE BECOMING MORE EASTERLY THIS AFTERNOON.
THUNDERSTORM CHANCES RETURN MONDAY AS THE UPPER LEVEL LOW OVER
OKLAHOMA TRACKS NORTHEAST ALONG THE UPPER LEVEL RIDGE. MOST OF
MONDAY WILL LIKELY BE DRY, BUT COULD SEE SOME POP UP THUNDERSTORMS
DEVELOP DURING THE AFTERNOON BEFORE THE BETTER LIFT ARRIVES
MONDAY NIGHT INTO TUESDAY WITH THE TROUGH AXIS AND POSITIVE
VORTICITY ADVECTION. WITH PRECIPITABLE WATER VALUES APPROACHING 2
INCHES AND SLOW STORM MOTIONS LOCALIZED HEAVY RAIN IS POSSIBLE. WE
REMAIN IN WPC'S MARGINAL RISK FOR RAINFALL EXCEEDING FLASH FLOOD
GUIDANCE ON TUESDAY. SOUNDINGS ALSO SUPPORT THAT WE COULD GET SOME
STRONGER WINDS WITH ANY ISOLATED OR MULTICELL CLUSTERS OF
THUNDERSTORMS.
- HOT AND MIDWEEK WITH CHANCES (30-50 PERCENT) FOR THUNDERSTORMS
DEW POINTS WILL BE IN THE 60S AND 70S THROUGH MUCH OF THE UPCOMING
WEEK CREATING A HUMID ENVIRONMENT. TEMPERATURES WILL BE ON THE
RISE EACH DAY AS WELL WITH WEDNESDAY AND THURSDAY EXPECTED TO BE
THE HOTTEST DAYS OF THE WEEK. IT IS THESE DAYS WE'LL NEED TO
MONITOR FOR HEAT INDICES APPROACHING OR EXCEEDING 100. HOWEVER
THERE WILL BE CHANCES FOR THUNDERSTORMS BOTH OF THESE DAYS THAT
COULD IMPACT TEMPERATURES AND LIMIT HEAT INDEX VALUES. WEDNESDAY
CHANCES ARE LOWER IN THE 20S AND 30S AND MAINLY FOCUSED IN THE
MORNING WITH LIFT AT 850MB. THURSDAY CHANCES ARE BETTER (40 TO 60
PERCENT) DURING THE LATE AFTERNOON AND EVENING. THIS COULD BE
ANOTHER PERIOD TO WATCH FOR SEVERE THUNDERSTORMS.
AVIATION /18Z TAFS THROUGH 18Z MONDAY/
ISSUED AT 122 PM EDT SUN JUN 7 2026
VFR EXPECTED THROUGH THIS TAF PERIOD BEFORE TURNING MORE ACTIVE
BEYOND 18Z MONDAY. LIGHT WINDS CONTINUE THROUGH THIS AFTERNOON AND
TONIGHT. ESE WINDS ESPECIALLY AFTER 12Z MONDAY WILL PICK UP A BIT,
AND MAY HAVE TO TREND WINDS A BIT HIGHER WITH THE 00Z PACKAGE.
CAN'T RULE OUT SOME GUSTS CLOSE TO 20 KTS ESPECIALLY MONDAY
AFTERNOON, BUT WILL TAKE ANOTHER LOOK. THUNDERSTORM CHANCES WILL
BE INCREASING FROM S TO N AFTER 18Z MONDAY AND MAY NEED TO INCLUDE
MENTION FOR SOME SITES WITH THE 00Z SET.
MARINE
ISSUED AT 209 AM EDT SUN JUN 7 2026
LIGHT EAST TO NORTHEAST WINDS TODAY BECOME MORE NORTH TO
NORTHWESTERLY ALONG THE LAKESHORE AS THE LAKE BREEZE DEVELOPS THIS
AFTERNOON. EASTERLY WINDS THEN RETURN THIS EVENING AND BECOME
SOUTHEASTERLY FOR MONDAY. THUNDERSTORMS WILL BE POSSIBLE LATE
MONDAY AFTERNOON WITH BETTER CHANCES MONDAY NIGHT INTO TUESDAY.
ADDITIONAL CHANCES FOR STORMS EXIST FOR WEDNESDAY AND THURSDAY.
SMALL CRAFT ADVISORY CONDITIONS MAY BE POSSIBLE IN THE SOUTHWEST
WINDS EXPECTED WEDNESDAY INTO THURSDAY AND ALSO MAY RESULT IN HIGH
SWIM RISK CONDITIONS FOR AREAS NORTH OF GRAND HAVEN.
GRR WATCHES/WARNINGS/ADVISORIES
MI...NONE.
MARINE...NONE.
DISCUSSION...RAH
AVIATION...HOVING
MARINE...RAH
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