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KEY MESSAGES

- Chance for showers/storms thru this evening. Marginal severe risk this afternoon/early evening in our southeast.

- Increasing shower/storm chances this weekend, especially Saturday night.

UPDATE

Issued at 645 AM EDT Wed Aug 12 2026

Cluster of showers/storms moving across nw lower MI, pretty steady in intensity (after weakening coming off of ne WI earlier this morning). Bring with area across our southern zones this morning, eventually exiting towards northern Saginaw Bay.

DISCUSSION

Issued at 250 AM EDT Wed Aug 12 2026

Reasonably fast wnw-flow aloft continues overhead for a few more days, at least until a upper ridge tries to build toward the western lakes this weekend. The primary frontal zone has settled well to our south, associated with the MCS track from the southern lakes to mid- Atlantic states. But a secondary instability axis is reforming further north, noting that spotty deep convection is ongoing in central/northern WI. A secondary surface trof/front is also drifting southward across MI today.

Today/tonight...some morning fog/lower clouds remains possible, especially in the south, where the BL is more moist. This will again erode fairly quickly this morning. Strong diurnal heating will boost instability, which will also be highest in the south. Recent HRRR runs take MlCape values to just above 1k j/kg south of M-72. There will be opportunities for localized low-level moisture pooling just ahead of lake breeze boundaries. Speaking of which, that is our clear initial trigger source today. Certainly a chance for fire something as far north as inland from APN/Rogers, where lake breezes converge from two different directions. However, the best for stronger storms will be further south, where initiation feels a little less certain. But we managed reasonable coverage of showers/storms Monday se of the office, in another boundary-poor environment. We just need to pop a couple of outflow boundaries to breed new convective cells.

So, will be increasing pops over guidance this afternoon and evening. Low level winds are negligible, and 0-1km bulk shear is as well. But 0-6km bulk shear values are 40-50kt, thanks to fast mid- level flow. So some potential for upscale growth and storm organization, especially in the south with richer instability. Any severe storms would pose a wind and maybe hail threat. SPC has shrunk/reoriented the marginal SVR risk to just our se zones, and this makes perfect sense to me. After late evening, will have little precip, but some fog again possible (especially where it rains later today).

Thursday and beyond...high pressure building se from central Canada will shove the frontal zone further south. Developing ne low-level flow will bring in cooler/drier/more stable air. After maybe a stray shower or two Thursday, dry wx is expected Thu night thru Fri night. After that, the high heads east and return flow kicks in. Shower/ storm chances look to return over the weekend, with at least an outside chance for healthy rainfall, centered for now on Saturday night. Dry and cool northerly flow for Monday, before becoming unsettled again after. Max temps mid 70s to lower 80s for the next several days, a little cooler Sunday and beyond. Note that models have trended a little milder for the end of this week.

AVIATION /12Z TAFS THROUGH 12Z THURSDAY/

Issued at 642 AM EDT Wed Aug 12 2026

TVC/MBL dealing with VCTS thru 13Z. This activity will then move ese-ward, passing south of APN. APN also has some early morning fog, which will quickly erode. Additional SHRA/TSRA activity will develop in ne lower MI this afternoon, and do expect APN to have VCTS then. And APN/MBL are likely to have fog late tonight. Otherwise VFR this forecast. Light winds.

APX WATCHES/WARNINGS/ADVISORIES

MI...None. MARINE...None.