217
FXUS63 KGRR 220336
AFDGRR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
1136 PM EDT TUE MAY 21 2019
LATEST UPDATE...
AVIATION
SYNOPSIS
ISSUED AT 258 PM EDT TUE MAY 21 2019
- RAIN SHOWERS/ISOLATED THUNDER LATE TONIGHT
- HEAVIER RAIN POSSIBLE FRIDAY NIGHT
- MEMORIAL DAY WEEKEND SEASONABLY COOL, MOSTLY DRY
DISCUSSION
(THIS EVENING THROUGH NEXT TUESDAY)
ISSUED AT 258 PM EDT TUE MAY 21 2019
PRIMARY FORECAST CONCERNS ARE TIMING AND AMOUNT OF PRECIP LATE
TONIGHT AND AGAIN FRIDAY NIGHT. FOR TONIGHT...SHOWERS AND
ISOLATED THUNDERSTORMS ASSOCIATED WITH WARM CONVEYER BELT ARRIVE
ACROSS THE WESTERN FORECAST AREA AFTER MIDNIGHT AND SPREAD SLOWLY
EAST BY DAYBREAK. BACK EDGE MOVES THROUGH BY AFTERNOON WITH ENOUGH
SUNSHINE FOR TEMPERATURES TO RECOVER INTO THE 70S.
THERE IS A LOW CHANCE FOR SHOWERS AS A COLD FRONT PUSHES THROUGH
WEDNESDAY NIGHT. MOISTURE IS LIMITED HOWEVER SO MOST PLACES MAY
REMAIN DRY. AN ACTIVE PATTERN CONTINUES THROUGH THE END OF THE
WEEK WITH A SFC LOW PUSHING A WARM FRONT NORTH ON FRIDAY. MOST OF
THE RAIN WITH THIS LOW WILL OCCUR FRIDAY NIGHT AS SHOWERS AND
THUNDERSTORMS FIRE UP ALONG THE ADVANCING COLD FRONT. EXTENT OF
CONVECTION COULD BE LIMITED BY LACK OF INSTABILITY DUE TO LATE
NIGHT FRONTAL PASSAGE.
MEMORIAL DAY WEEKEND LOOKS LIKE MOSTLY FAIR WEATHER AS FRONT
STALLS ACROSS THE OHIO RIVER VALLEY AND CANADIAN SFC HIGH BUILDS
IN WITH SEASONABLY COOL WEATHER.
AVIATION
(FOR THE 06Z TAFS THROUGH 06Z THURSDAY)
ISSUED AT 1130 PM EDT TUE MAY 21 2019
VFR CONDITIONS OVERNIGHT WILL GRADUALLY DETERIORATE TO MVFR
EARLY WEDNESDAY MORNING DUE TO DEVELOPMENT OF LOW CLOUDS AND
SHOWERS. ISOLATED THUNDERSTORMS ARE ALSO POSSIBLE DURING THE
EARLY TO MID MORNING HOURS WEDNESDAY.
CONDITIONS WILL THEN IMPROVE TO VFR WEDNESDAY AFTERNOON AND
EVENING. SOME SCATTERED SHOWERS AND PERHAPS A FEW THUNDERSTORMS
WILL MOVE IN FROM THE WEST DURING THE LATE EVENING HORUS WEDNESDAY
AND COULD CAUSE BRIEF REDUCTIONS TO MVFR/IFR AT OUR WESTERN
TERMINALS AFTER AROUND 03Z THURSDAY.
MARINE
ISSUED AT 258 PM EDT TUE MAY 21 2019
OFFSHORE WINDS TONIGHT AND WEDNESDAY WILL MEAN WAVE HEIGHTS
SHOULD REMAIN BELOW 4 FEET. WINDS COULD GUST ABOVE 25 KNOTS AT
TIMES NORTH OF PENTWATER ON WEDNESDAY.
GRR WATCHES/WARNINGS/ADVISORIES
MI...NONE.
LM...NONE.
SYNOPSIS...OSTUNO
DISCUSSION...OSTUNO
AVIATION...LAURENS
MARINE...OSTUNO
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