958
FXUS63 KGRR 271800
AFDGRR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
200 PM EDT SUN SEP 27 2026
KEY MESSAGES
- DRY THROUGH TUESDAY
- RAIN CHANCES RETURN WEDNESDAY INTO THURSDAY
- FAIR WEATHER AGAIN FOR FRIDAY AND SATURDAY
DISCUSSION
ISSUED AT 200 PM EDT SUN SEP 27 2026
- DRY THROUGH TUESDAY
HIGH PRESSURE REMAINS IN PLACE THROUGH TUESDAY WITH US SANDWICHED
BETWEEN THE NOR'EASTER TO THE EAST AND TROUGH TO THE WEST.
SIMILAR TO THIS MORNING, FOG WILL BE POSSIBLE EARLY MONDAY MORNING
TOWARD THE LANSING AND JACKSON AREAS. FOG COULD BE AS DENSE AS
THIS MORNING WITH VISIBILITIES AROUND A QUARTER OF A MILE. IF FOG
DEVELOPS BE SURE TO USE LOW-BEAM HEADLIGHTS AND GIVE YOURSELF
PLENTY OF DISTANCE AND TIME FOR THE MORNING COMMUTE.
HIGHS WILL BE IN THE 70S WITH LOWS IN THE 40S. A FEW SPOTS ALONG AND
NORTH OF US-10 MAY DROP INTO THE UPPER 30S.
- RAIN CHANCES RETURN WEDNESDAY INTO THURSDAY
THE RIDGE OVERHEAD WILL SLOWLY WEAKEN. THE TIMING OF THIS
OCCURRING IS TRENDING SLOWER AS SEEN IN THE ONSET OF PRECIPITATION
CHANCES IN THE ENSEMBLES. AS WE MOVE INTO MORE SOUTHERLY FLOW
SOME SHOWERS MAY DEVELOP LATE TUESDAY NIGHT INTO WEDNESDAY MORNING
WITH THE BEST CHANCES (GREATER THAN 40 PERCENT) NORTH OF A
HOLLAND TO GRAND RAPIDS TO ALMA LINE. WITH THE RECENT TRENDS IT IS
POSSIBLE MOST COULD STAY DRY UNTIL WEDNESDAY NIGHT INTO THURSDAY
AS THE FRONT MOVES IN WITH PRECIPITATION CHANCES INCREASING INTO
THE 60 TO 70 PERCENT RANGE).
HIGHS IN THE 70S WITH LOWS IN THE 50S AND 60S ARE EXPECTED.
- FAIR WEATHER AGAIN FOR FRIDAY AND SATURDAY
HIGH PRESSURE BUILDS IN BEHIND THE COLD FRONT THURSDAY BRINGING
DRY AND COOLER CONDITIONS FOR FRIDAY AND SATURDAY. HIGHS ARE ONLY
EXPECTED TO BE IN THE 60S WITH THE COLDEST TEMPERATURES SATURDAY
MORNING IN THE MID 30S TO 40S.
AVIATION /18Z TAFS THROUGH 18Z MONDAY/
ISSUED AT 200 PM EDT SUN SEP 27 2026
THIS MORNING FEATURED AREAS OF DENSE FOG VICINITY NE-S OF LAN AND
AT JXN, AND PATCHY OR SHALLOW FOG ELSEWHERE. VFR IS EXPECTED
THROUGH THIS EVENING WITH GENERALLY LIGHT WINDS FROM THE NORTH,
THOUGH SOME DIRECTIONAL VARIABILITY WITH THE WINDS MAY OCCUR.
SIMILAR PATTERN FOR TONIGHT INTO MONDAY MORNING WITH AREAS OF FOG
EXPECTED VICINITY OF LAN AND AT JXN, WITH PATCHY OR SHALLOW FOG
ELSEWHERE. MOISTURE BELOW 1,000 FEET THIS EVENING IS EXPECTED TO
FLOW IN OFF LAKE HURON TOWARD LAN AND JXN, THEN DIMINISHING WINDS
LATE IN THE NIGHT WITH MOSTLY CLEAR SKIES WILL FAVOR FOG
DEVELOPMENT.
MARINE
ISSUED AT 200 PM EDT SUN SEP 27 2026
LIGHT WINDS CONTINUE WITH WAVES LESS 2 FEET THROUGH TUESDAY.
NORTHERLY WINDS CONTINUE INTO MONDAY WITH PEAK WINDS 10 TO 15
KNOTS DURING THE AFTERNOON. TUESDAY WINDS BECOME MORE SOUTHERLY
AND INCREASE TUESDAY INTO WEDNESDAY WITH GUSTS POTENTIALLY
APPROACHING SMALL CRAFT ADVISORY CRITERIA WEDNESDAY AFTERNOON.
THIS COULD RESULT IN A BRIEF PERIOD OF HIGH SWIM RISK CONDITIONS
NORTH OF GRAND HAVEN WEDNESDAY.
WINDS REMAIN LARGELY IN THE 10 TO 20 KNOT RANGE INTO FRIDAY.
SOUTHERLY WINDS TURN TO THE NORTHWEST BEHIND THE FRONT THURSDAY.
CONDITIONS MAY APPROACH SMALL CRAFT ADVISORY LEVELS AT TIMES
THROUGH FRIDAY WITH THE BEST CHANCES NORTH OF GRAND HAVEN.
GRR WATCHES/WARNINGS/ADVISORIES
MI...NONE.
MARINE...NONE.
DISCUSSION...RAH
AVIATION...CAS
MARINE...RAH
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