805
FXUS63 KGRR 272346
AFDGRR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
746 PM EDT TUE SEP 27 2022
LATEST UPDATE...
AVIATION
DISCUSSION
(THIS EVENING THROUGH NEXT TUESDAY)
ISSUED AT 305 PM EDT TUE SEP 27 2022
FORECAST CONCERNS CENTER AROUND COLD TEMPERATURES FOR WEDNESDAY
NIGHT. SURFACE HIGH BUILDING IN SHOULD MEAN CLOUDS AND WINDS WILL
DECREASE ALLOWING GOOD RADIATIONAL COOLING WHICH, COMBINED WITH
COLD AIRMASS, WILL LEAD TO WIDESPREAD FROST AND SOME FREEZING
TEMPERATURES.
THE SET UP IS SIMILAR TO THE COLD MORNING OF SEPTEMBER 23RD, WITH
LOWS POTENTIALLY A DEGREE OR TWO COLDER. WE HAVE LOWERED MIN
TEMPS WITH THIS FORECAST AND NOW HAVE A MORE EXPANSIVE AREA OF
UPPER 20S ACROSS THE NORTHERN INTERIOR ZONES WITH LOWER 30S ACROSS
THE CENTRAL ZONES AND MID 30S ACROSS THE SOUTH. WITH CLEAR SKIES
AND LIGHT WINDS, AREAS OF FROST ARE EXPECTED IN MOST AREAS.
TEMPERATURES MAY BE COLD ENOUGH FOR LONG ENOUGH TO END THE
GROWING SEASON ACROSS PART OF THE NORTHERN INTERIOR CWA.
SURFACE HIGH MOVES EAST ON THURSDAY BUT AIRMASS IS STILL COOL AND
DRY AND MOSTLY CLEAR SKIES WILL MEAN AT LEAST PATCHY FROST WITH
TEMPERATURES FALLING INTO THE MID TO UPPER 30S.
MODERATING TEMPERATURES FOR THE WEEKEND AS HEIGHTS RISE WITH THE
HURRICANE REMNANT RAINS MAKING IT AS FAR NORTH AS THE OHIO VALLEY
BUT NOT INTO LOWER MICHIGAN AS WESTERLY FLOW EVENTUALLY PUSHES IT
AWAY AND OFF THE ATLANTIC COAST.
AVIATION
(FOR THE 00Z TAFS THROUGH 00Z WEDNESDAY EVENING)
ISSUED AT 740 PM EDT TUE SEP 27 2022
AN AREA OF LOWER CLOUDS AND SHOWERS DROPPING DOWN FROM THE NORTH
WAS PRODUCING MAINLY MVFR CONDITIONS FOR THE TAF SITES TO START
THE PERIOD. THE MAIN SUPPORT FOR THE SHOWERS SHIFTS SOUTH OF THE
TAF SITES OVERNIGHT AND THIS WILL ALLOW FOR SLIGHT DRYING...WHICH
IN TURN COULD SUPPORT A TREND TOWARD VFR CONDITIONS. FURTHER
DRYING IS PREDICTED FOR WEDNESDAY SO WHILE CLOUD COVER WILL LIKELY
BE BROKEN...VFR LEVELS WILL LIKELY PREVAIL DURING THE DAY.
MARINE
ISSUED AT 305 PM EDT TUE SEP 27 2022
NO CHANGES TO ONGOING SCA AS WINDS AND WAVES WILL CONTINUE
ELEVATED OVERNIGHT BEFORE DECREASING ON WEDNESDAY.
GRR WATCHES/WARNINGS/ADVISORIES
MI...BEACH HAZARDS STATEMENT THROUGH WEDNESDAY MORNING FOR MIZ037-043-
050-056-064-071.
LM...SMALL CRAFT ADVISORY UNTIL 11 AM EDT WEDNESDAY FOR LMZ844>849.
DISCUSSION...OSTUNO
AVIATION...MJS
MARINE...OSTUNO
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