723
FXUS63 KGRR 192358
AFDGRR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
758 PM EDT SUN APR 19 2026
KEY MESSAGES
- FREEZE WARNING TONIGHT
- SOME STORMINESS BY FRIDAY
DISCUSSION
ISSUED AT 245 PM EDT SUN APR 19 2026
- FREEZE WARNING TONIGHT
SHARP UPPER TROUGH MOVING THROUGH TODAY COMBINED WITH SUFFICIENT
LOW TO MID LEVEL MOISTURE HAS RESULTED IN CONVECTIVE UPDRAFTS
WITH SCATTERED SHOWERS THIS AFTERNOON. LAKE SHADOW AND HIGH CLOUDS
HAS PREVENTED WIDESPREAD DEEPER UPDRAFTS, LOWERING THE POTENTIAL
FOR ICE PELLET/GRAUPEL. SHOWERS WILL DIMINISH END THIS EVENING AS
THE TROUGH AXIS MOVES EAST AND WITH THE LOSS OF INSOLATION.
COLD SURFACE HIGH BUILDS IN OVERNIGHT WITH DRYING AND SUBSIDENCE
WITH WINDS DECOUPLING AFTER MIDNIGHT. RADIATIONAL COOLING
CONDITIONS BECOME OPTIMAL BY 12Z WITH THE SURFACE HIGH PROGGED TO
BE CENTERED OVER SOUTHWEST LOWER MICHIGAN. A HARD FREEZE IS
EXPECTED AS TEMPERATURES WILL BE BELOW FREEZING FOR SEVERAL
HOURS.
- SOME STORMINESS BY FRIDAY
THE SURFACE HIGH MOVES EAST BY TUESDAY WITH SOUTHERLY FLOW
DEVELOPING BUT THE MOISTURE RETURN DOES NOT IMMEDIATELY RESULT IN
PRECIPITATION AS SHORTWAVE RIDGING IS EXPECTED DURING THE MIDDLE
PART OF THE WEEK AHEAD OF AN UPPER LOW OVER THE NW CONUS THAT
EVENTUALLY MOVES INTO UPPER PLAINS AND CANADA BY THE END OF THE
WEEK. A COLD FRONT TRAILING A SURFACE LOW MOVING INTO NORTHERN
MINNESOTA BEFORE IT OCCLUDES AND MOVES INTO CANADA WILL
CONCENTRATE SHOWERS ON FRIDAY WITH THE CHANCE FOR THUNDERSTORMS
DURING THE AFTERNOON.
AVIATION /00Z TAFS THROUGH 00Z TUESDAY/
ISSUED AT 759 PM EDT SUN APR 19 2026
CUMULUS CLOUDS ARE IN THE PROCESS OF SCATTERING OUT. THE CLOUDS
DRIFTING OUT OF WISCONSIN SHOULD CONTINUE TO DISSIPATE AND SHOULD
NOT AFFECT THE TAFS MUCH AT ALL. VFR CONDITIONS ARE EXPECTED THE
NEXT 24 HOURS WITH EITHER CLEAR SKIES OR FEW-SCT CLOUDS AROUND
5,000 FEET. WINDS ARE IN THE PROCESS OF DIMINISHING AND WITHIN THE
NEXT OUR OR TWO SHOULD LOSE THE GUSTS. WINDS ARE EXPECTED TO BE
LIGHT TONIGHT OUT OF THE NORTH.
MARINE
ISSUED AT 245 PM EDT SUN APR 19 2026
HIGH PRESSURE BRINGS TRANQUIL CONDITIONS ON LAKE MICHIGAN TONIGHT
AND MONDAY. THE HIGH WILL MOVE EAST AND SOUTHERLY WINDS INCREASE AND
WAVES WILL BUILD MONDAY NIGHT. A SCA WILL BE NEEDED FROM LATE
MONDAY THROUGH TUESDAY.
GRR WATCHES/WARNINGS/ADVISORIES
MI...FREEZE WARNING FROM 11 PM THIS EVENING TO 11 AM EDT MONDAY FOR
MIZ050>052-056>059-064>067-071>074.
MARINE...NONE.
DISCUSSION...OSTUNO
AVIATION...DUKE
MARINE...OSTUNO
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