039
FXUS63 KGRR 112318
AFDGRR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
718 PM EDT THU SEP 11 2025
KEY MESSAGES
- SHOWERS POSSIBLE SATURDAY, OTHERWISE WARM AND DRY
DISCUSSION
ISSUED AT 233 PM EDT THU SEP 11 2025
THE WARM WEATHER CONTINUES WITH HIGH PRESSURE OVER THE AREA INTO
FRIDAY. AFTERNOON HIGHS WILL LARGELY BE IN THE UPPER 70S TO LOW
80S WITH INLAND AREAS POTENTIALLY HITTING 90 FOR THE FIRST HALF OF
NEXT WEEK. LOW TEMPERATURES WILL MOSTLY BE IN THE 50S WITH SOME
SPOTS DROPPING INTO THE 40S TONIGHT. COOLER AND LOW LYING AREAS
MAY SEE SOME FOG DEVELOP REDUCING VISIBILITIES IN SPOTS THROUGH
THE EARLY MORNING HOURS FRIDAY.
OUR OVERALL PATTERN WILL BRING A SHORTWAVE TROUGH THROUGH THE AREA
FOR SATURDAY BRINGING US A CHANCE FOR SHOWERS AND MAYBE A FEW
RUMBLES OF THUNDER DURING THE DAY SATURDAY AND POTENTIALLY
LINGERING INTO THE EVENING HOURS. CHANCES OVERALL HAVEN'T INCREASE
WITH MOST IN THE 20-30 PERCENT CHANCE RANGE. THIS HAS TRENDED
SLIGHTLY DOWNWARD FROM THE PREVIOUS FORECAST WITH THE RECENT
TRENDS. THERE IS A WEAKENING LOW LEVEL JET THAT NOSES INTO THE
AREA ALONG WITH SOME WARM AIR ADVECTION. NAM SOLUTIONS ARE THE
MOST AGGRESSIVE WITH INSTABILITY, BUT OTHERS KEEP IT MORE SO TO
OUR SOUTHWEST. THE TROUGH AXIS CLEARS SATURDAY EVENING WITH
SUBSIDENCE UNDER THE BUILDING RIDGE MOVING IN FOR SUNDAY WHICH
WILL BE IN PLACE THROUGH THE FIRST HALF OF NEXT WEEK.
AVIATION /00Z TAFS THROUGH 00Z FRIDAY/
ISSUED AT 717 PM EDT THU SEP 11 2025
MOSTLY CLEAR SKIES ARE EXPECTED OVERNIGHT. LIGHT WINDS MAY LEAD TO
SOME MVFR FOG AROUND SUNRISE AT JXN, OTHERWISE, MAINLY HIGH CLOUDS
ARE EXPECTED.
MARINE
ISSUED AT 108 PM EDT THU SEP 11 2025
NO MARINE HAZARDS ARE EXPECTED TODAY OR FRIDAY. WINDS WILL BECOME
SOUTHERLY FRIDAY AND WAVES WILL BUILD TO 1 TO 3 FEET. ISOLATED
THUNDERSTORMS ARE POSSIBLE SATURDAY.
GRR WATCHES/WARNINGS/ADVISORIES
MI...NONE.
MARINE...NONE.
DISCUSSION...RAH
AVIATION...04
MARINE...04
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