201
FXUS63 KGRR 161108
AFDGRR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
708 AM EDT TUE SEP 16 2025
KEY MESSAGES
- DRY AND WARM THROUGH FRIDAY
- SHOWERS POSSIBLE THIS WEEKEND INTO NEXT WEEK
DISCUSSION
ISSUED AT 237 AM EDT TUE SEP 16 2025
- DRY AND WARM THROUGH FRIDAY
WITH HIGH PRESSURE IN PLACE AND LIGHT WINDS WE WILL HAVE THE
POTENTIAL FOR FOG THE NEXT FEW NIGHTS AND EARLY MORNINGS. WE'RE
ALREADY SEEING SOME VISIBILITY DROPS TOWARD ALMA AND LOWER
CEILINGS IN MOUNT PLEASANT. THIS IS SEEN ON THE NIGHTTIME
MICROPHYSICS SATELLITE IMAGERY EXPANDING FROM SAGINAW BAY. IT IS
IN THIS AREA WE ARE EXPECTING THE LOWEST VISIBILITIES TO BE
PRESENT WITH SOME LOCALLY DENSE FOG POSSIBLE. REDUCED VISIBILITIES
COULD EXPAND ACROSS THE US-127 CORRIDOR WITH ANY FOG BURNING OFF
WITHIN A FEW HOURS OF SUNRISE. SIMILAR CONDITIONS ARE EXPECTED
TUESDAY NIGHT INTO WEDNESDAY MORNING AND COULD EXPAND FARTHER
WEST. MAKE SURE TO SLOW DOWN, GIVE YOURSELF EXTRA TIME, AND USE
YOUR LOW-BEAM HEADLIGHTS IN FOG.
LIGHT EASTERLY WINDS AND WARM TEMPERATURES WITH HIGHS IN THE 80S
CONTINUE THROUGH THE WEEK. A LAKE BREEZE IS LIKELY EACH DAY
BRINGING SOME COOLER TEMPERATURES ALONG THE LAKESHORE DURING THE
AFTERNOON. A FRONT THURSDAY NIGHT INTO FRIDAY WILL BRING SLIGHTLY
LOWER TEMPERATURES FOR FRIDAY WITH HIGHS IN THE MID 70S TO MID
80S. THE 10 TO 20 PERCENT POPS ALONG THIS FRONT HAVE DECREASED
WITH THE LATEST TRENDS. THIS IS LIKELY DUE TO THE DRY AIR IN
PLACE, BUT SOME INCREASED CLOUD COVER REMAINS POSSIBLE.
- SHOWERS POSSIBLE THIS WEEKEND INTO NEXT WEEK
AS THE UPPER LEVEL RIDGE WEAKENS, A WEAK SHORTWAVE TROUGH
APPROACHES FOR THE WEEKEND. THIS MAY BE ENOUGH FOR SOME SHOWERS TO
DEVELOP SATURDAY AND CONTINUE INTO SUNDAY. ENSEMBLES PICK UP ON
THIS MORE HEADING INTO SUNDAY NIGHT AND THEN ARE IN EVEN MORE
AGREEMENT HEADING INTO MONDAY AND TUESDAY. THE HIGHER CONFIDENCE
TOWARD THE BEGINNING OF NEXT WEEK IS DUE TO A STRONGER/DEEPER
TROUGH BRINGING WITH IT BETTER MOISTURE. AMOUNTS OVERALL LOOK
LIGHT IN THE ENSEMBLES WITH ONLY A 5 PERCENT PROBABILITY OF AN
INCH OR MORE DURING ANY 24 HOUR PERIOD.
AVIATION /12Z TAFS THROUGH 12Z WEDNESDAY/
ISSUED AT 707 AM EDT TUE SEP 16 2025
FOG THIS MORNING IS FOCUSED MAINLY NORTH OF THE TAF SITES, BUT
COULD SEE VISIBILITIES DROP INTO THE IFR/MVFR CATEGORY BRIEFLY
THIS MORNING AROUND 12Z. VFR CONDITIONS ARE EXPECTED THROUGH THE
DAY WITH A LAKE BREEZE ALONG THE LAKESHORE THIS AFTERNOON. ANOTHER
ROUND OF FOG IS EXPECTED TONIGHT AND IS EXPECTED TO BE MORE
WIDESPREAD TOMORROW MORNING DROPPING VISIBILITIES TO IFR VALUES
AND POTENTIALLY DOWN TO LIFR ESPECIALLY TOWARD JXN AND LAN.
MARINE
ISSUED AT 237 AM EDT TUE SEP 16 2025
FAIR CONDITIONS CONTINUE THROUGH THE WEEK WITH A CHANCE (20 TO 30
PERCENT) FOR SHOWERS OVER THE WEEKEND. WINDS WILL BE EASTERLY
INITIALLY DURING THE DAY BEFORE THE LAKE BREEZE DEVELOPS AND MOVES
MORE ONSHORE DURING THE AFTERNOON TODAY AND WEDNESDAY. WAVES OF A
FOOT OR LESS ARE EXPECTED THROUGH MOST OF THE FORECAST.
GRR WATCHES/WARNINGS/ADVISORIES
MI...DENSE FOG ADVISORY UNTIL 10 AM EDT THIS MORNING FOR MIZ045-046-
051.
MARINE...NONE.
DISCUSSION...RAH
AVIATION...RAH
MARINE...RAH
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