textproduct: Grand Rapids

KEY MESSAGES

- Dry weather continues through the first half of tomorrow

- Showers and storms possible late Saturday with fold front

- Cooler and drier weather through early next week

DISCUSSION

Issued at 240 PM EDT Fri Jun 12 2026

- Dry weather continues through the first half of tomorrow

The reprieve from any showers and storms will be short lived. A large upper level low will continues is trek through central way through Canada tomorrow. A short wave trough and a corresponding low will move along the southern gradient of that system. Models are in fair agreement on the track of this system. Near normal temperatures will continue with fair weather tonight and through most of Saturday.

- Showers and storms possible late Saturday with fold front

The above mentioned upper level low will sweep a cold front through the region Saturday evening. Latest timing continues to delay frontal passage. First round of CAMS has convection reaching the shores of Michigan tomorrow evening. The best moisture are instability remains in the Great Plains, However there is a mid level short wave with a weak low level jet that could aid in storm development along the frontal boundary. With The daytime temps 5 to 10 degrees above normal, in the 80s, and dewpoints in the 60s the airmass will aid convection development. Due to those considerations, SPC has included much of Lower Michigan in a marginal risk tomorrow evening. This system so far looks weaker and does not contain the forcing as last night's. Latest models actually has the wave elongate as it moves eastward and deepen as it advects into the Mid Atlantic. So expect another round of showers and storms tomorrow evening, especially along the I 94 corridor.

- Cooler and drier weather through first half of the week

Downsloping flow in the wake of the cold front will bring 850 temps of +4C overhead Sunday. This will drop highs 5 to 10 degrees below normal. So a return of cool spring greets us this week as we stand on the edge of summer. The week ahead should have daytime highs in the 70s with lows in the 50s which is around 5 degrees below normal. Next chance for rain is midweek from shortwave that should clip the Great Lakes.

AVIATION /06Z TAFS THROUGH 06Z SUNDAY/

Issued at 156 AM EDT Sat Jun 13 2026

VFR weather will prevail at the TAF sites across Southwest Lower Michigan at least into the afternoon hours of Saturday. We really are not expecting any restriction to visibility or a substantial lowering of ceiling to MVFR until the evening hours. Cloud bases up to that time will likely be at or above 8,000 feet.

During the evening a cold front will approach from the northwest and scattered showers and thunderstorms are expected to develop along and ahead of it. It is really the 22Z to 06Z time frame that we should see showers/storms sagging southward through the TAF sites. MVFR and potentially even IFR will be possible during the heaviest activity, but this will not lower conditions for very long at any one location.

Winds today will be gusty from the southwest at 14-27 knots.

MARINE

Issued at 240 PM EDT Fri Jun 12 2026

Waves continue to calm this evening. This will be short lived and the approaching front will bring strong southwesterly flow that will increase winds and waves early Saturday. Due to this strong southwesterly flow.

GRR WATCHES/WARNINGS/ADVISORIES

MI...Beach Hazards Statement from 5 AM EDT early this morning through late tonight for MIZ037-043-050. MARINE...Small Craft Advisory from 5 AM early this morning to 2 AM EDT Sunday for LMZ847>849.