textproduct: Detroit/Pontiac

KEY MESSAGES

- Seasonable temperatures with lower humidity with exist through early next week.

- Next chance of showers and thunderstorms arrives Tuesday night into Wednesday.

DTW THRESHOLD PROBABILITIES

* Low for ceilings aob 5000 feet tonight and Sunday.

PREV DISCUSSION

Issued at 339 PM EDT Sat Sep 5 2026

DISCUSSION...

Broad area of surface high pressure continues to build south from Ontario late this afternoon and will maintain influence throughout the remainder of the weekend. Lingering axis of higher low level moisture quality still extends from near Grand Rapids southeast into the I-94 to Ohio border corridor late this afternoon. There remains potential for a few isolated showers to emerge yet through peak heating along this gradient through early evening. Otherwise, deep layer stability and subsidence will dominate through this period. Lingering late day diurnal cu will fade into the evening with the loss of daytime heating and steady influx of drier air. Low temperatures overnight will range from the mid-50s across northern and rural areas to the lower 60s closer to the Detroit metro area. High pressure anchors directly over the central Great Lakes on Sunday. Mostly sunny skies during the day will yield seasonable highs in the upper 70s with dew points remaining comfortably in the 50s.

Low-to-mid level ridging over the central Plains will drift eastward directly over the Great Lakes early in the week. Broad subsidence and a very dry atmospheric column will maintain abundant sunshine and pleasant conditions across southeast Michigan on Monday. High temperatures will remain at near seasonal norms in the upper 70s with dew points remaining capped in the upper 50s to lower 60s. By Tuesday, the high pressure center shifts east toward the Atlantic seaboard, allowing low-level flow to veer around to the south- southwest. Warm air advection across the Ohio Valley will lift daytime highs back into the lower 80s. The daytime hours on Tuesday are expected to remain mostly dry under warm return flow, though high clouds will gradually thicken from west to east by late afternoon.

A strong Pacific upper-level disturbance will traverse southern Canada, flattening the Great Lakes ridge and driving a surface low across Ontario. An accompanying cold front will sweep south through lower Michigan Wednesday. Moisture return ahead of the boundary will push dew points back up, supporting the next round of scattered showers and rumbles of thunder starting late Tuesday night and peaking on Wednesday. Temperatures will spike into the mid-to-upper 80s Wednesday ahead of the frontal passage before cooler, drier air returns for the second half of the week.

MARINE...

Favorable marine conditions are forecast through the weekend as high pressure builds south from central Ontario, eventually settling over Lake Huron. This should promote stable and mainly dry conditions into early next week as more tranquil conditions take root. The next chance for increasing winds and waves arrives Tuesday night into Wednesday ahead of a low pressure system. The stronger Gulf- modified southwesterly flow and the low's associated warm/cold fronts should lead to rising thunderstorm chances.

DTX WATCHES/WARNINGS/ADVISORIES

MI...None. Lake Huron...None. Lake St Clair...None. Michigan waters of Lake Erie...None.