818
FXUS63 KGRR 171055
AFDGRR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
655 AM EDT SAT OCT 17 2026
KEY MESSAGES
- BLOCKING PATTERN BRINGS FAIR WEATHER
DISCUSSION
ISSUED AT 256 AM EDT SAT OCT 17 2026
- BLOCKING PATTERN BRINGS FAIR WEATHER
THE SHARP UPPER TROUGH THAT BROUGHT THE COLD AIR AND LAKE EFFECT
SHOWERS MOVES EAST OVER THE WEEKEND WITH RISING HEIGHTS AND
SOUTHWEST FLOW BRINGING WARMER TEMPERATURES. HOWEVER, THE CURRENT
COLD AIRMASS WILL STILL BE IN PLACE FOR TONIGHT AND ANOTHER ROUND
OF FROST/FREEZE CONDITIONS CAN BE EXPECTED AWAY FROM LAKE MICHIGAN
WHERE WINDS CAN DECOUPLE. THE GROWING SEASON WILL BE ENDED ON
SUNDAY, SINCE WE ARE PAST THE CLIMATOLOGICAL END OF THE SEASON AND
THE TWO NIGHTS OF COLD TEMPERATURES.
NO PRECIPITATION IS EXPECTED FOR THE NEXT WEEK UNDER UPPER
RIDGING. HEIGHT FALLS MAY FINALLY HAPPEN NEXT WEEKEND AS A
SHORTWAVE TROUGH MOVES ACROSS SOUTHERN CANADA AND APPROACHES THE
GREAT LAKES.
AVIATION /12Z TAFS THROUGH 12Z SUNDAY/
ISSUED AT 655 AM EDT SAT OCT 17 2026
VFR CONDITIONS WILL CONTINUE THROUGH SUNDAY MORNING. NORTHWEST
WINDS LESS THAN 10 KNOTS THIS MORNING WILL GO SOUTHWEST AND
INCREASE THIS AFTERNOON WITH SOME GUSTS TO 20 KNOTS AT MKG BY
LATE AFTERNOON.
MARINE
ISSUED AT 256 AM EDT SAT OCT 17 2026
THE GALE WARNING EXPIRED AT 2 AM AND WAS FOLLOWED WITH A SMALL
CRAFT ADVISORY UNTIL 10 AM. THE DAY SHIFT WILL HAVE TO HOIST
ANOTHER SCA OR EVEN A GALE WARNING FOR LATER TODAY AND BEYOND AS
SOUTHWEST WINDS INCREASE AND WAVES BUILD.
GRR WATCHES/WARNINGS/ADVISORIES
MI...FREEZE WARNING UNTIL 8 AM EDT THIS MORNING FOR MIZ043>046-
050>052-056>059.
FROST ADVISORY UNTIL 8 AM EDT THIS MORNING FOR MIZ064>067-
071>074.
MARINE...SMALL CRAFT ADVISORY UNTIL 10 AM EDT THIS MORNING FOR LMZ844>849.
DISCUSSION...OSTUNO
AVIATION...OSTUNO
MARINE...OSTUNO
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