433
FXUS63 KGRR 131124
AFDGRR
Area Forecast Discussion
National Weather Service Grand Rapids MI
724 AM EDT Tue May 13 2025
.KEY MESSAGES...
- Scattered showers and afternoon thunderstorms then Strong
storms possible Thursday evening.
&&
.DISCUSSION...
Issued at 340 AM EDT Tue May 13 2025
Upper low will bring scattered showers and a few thunderstorms
today through Thursday. Typical of an upper low, the showers will
be diurnally enhanced in the afternoon to early evening.
Conditions still look favorable for organized convection Thursday
evening as an upper trough moves east. Shear profiles show some
potential for strong to severe storms and possible rotating
updrafts. The storms will be along a cold/occluded front that
should clear Lower Michigan by Friday morning. Winds gusting over
30 mph can be expected to continue through Saturday as the sfc low
moves through the upper Great Lakes keeping a tight pressure
gradient across Lower Michigan.
&&
.AVIATION /12Z TAFS THROUGH 12Z WEDNESDAY/...
Issued at 723 AM EDT Tue May 13 2025
IFR conditions will prevail this morning as low clouds and
showers move through. The low clouds will scatter out by afternoon
but showers and a few thunderstorms will develop by evening,
yielding general MVFR conditions with isolated IFR in heavier
downpours.Low clouds and fog will bring more widespread IFR and
LIFR overnight.
&&
.MARINE...
Issued at 340 AM EDT Tue May 13 2025
Winds and waves will remain relatively light through Thursday. A
line of storms could bring strong winds Thursday evening followed
by winds gusting over 30 knots and waves building over 4 feet on
Friday and Saturday.
&&
.GRR WATCHES/WARNINGS/ADVISORIES...
MI...None.
MARINE...None.
&&
$$
DISCUSSION...Ostuno
AVIATION...Ostuno
MARINE...Ostuno
NWS GRR Office Area Forecast Discussion
