210 FXUS63 KGRR 080518 AFDGRRArea Forecast Discussion National Weather Service Grand Rapids MI 118 AM EDT Mon Sep 8 2025
.KEY MESSAGES...
- Frost possible tonight across the interior north
- Dry and warmer this week
&&
.DISCUSSION... Issued at 228 PM EDT Sun Sep 7 2025
- Frost possible tonight across the interior north
The center of high pressure is over Michigan today and we`ll see the diurnal cu dissipate with sunset. Wind will also diminish resulting in good radiational cooling conditions. Temperatures across the far northeast two counties will settle in the mid 30s tonight. When combined with dewpoints fairly close to that, we`re likely to see some frost develop; we`ve issued a Frost Advisory for Osceola and Clare counties from 2am to 9 am.
- Dry and warmer this week
The high will drift east early this week and south winds will develop. That`ll push warmer air northward into the Great Lakes. There really aren`t many chances for rain during the upcoming week. There`s an upper trough that swings through Wednesday, but the air ahead of it is really dry and we don`t anticipate any precipitation then.
Friday night across the northwest cwa may be the best chance as it will be close to the nose of the warm front to the west. But can`t see much more than a 20 percent chance at best.
The ECMWF ensembles are very dry with temperatures warming to around 80 by Wednesday and climbing to the lower 80s by the weekend.
&&
.AVIATION /06Z TAFS THROUGH 06Z TUESDAY/... Issued at 118 AM EDT Mon Sep 8 2025
Only real concern to aviation interests over the next 24 hours will be the potential for some fog toward daybreak this morning. Skies are mostly clear across the area, and winds are light and variable. The best potential for fog looks to be along the I-94 corridor terminals where winds aloft are a little lighter, and crossover temperatures from yesterday afternoon for fog development are a little more favorable. KJXN is the most likely sitting in a low area. Have gone with fog at the I-94 terminals, and VCFG at the I-96 terminals. This will be short lived through sunrise, and will then burn off.
Not much going on after the fog. Maybe some cumulus development, but it will be much less extensive than the past couple of days. Winds will be mainly from the SE this morning, and then turning to the south/southwest this afternoon. They will go light after sunset tonight then.
&&
.MARINE... Issued at 141 PM EDT Sun Sep 7 2025
Moderate beach hazards ongoing but winds and waves are trending down this evening. Southwest winds on Monday will build up 2-4 ft waves especially north of Grand Haven to Ludington by the afternoon and evening. These winds persisting Monday night into Tuesday may continue to build waves toward 3-5 feet, possibly necessitating a small craft advisory and beach hazards statement.
&&
.GRR WATCHES/WARNINGS/ADVISORIES... MI...Frost Advisory until 9 AM EDT this morning for MIZ039-040. MARINE...None.
&&
$$
DISCUSSION...04 AVIATION...NJJ MARINE...CAS
NWS GRR Office Area Forecast Discussion