942 FXUS63 KDTX 161735 AFDDTXArea Forecast Discussion National Weather Service Detroit/Pontiac MI 135 PM EDT Tue Sep 16 2025
.KEY MESSAGES...
- Above normal high temperatures continue into the weekend.
- Dry weather through the first half of the weekend.
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.AVIATION...
Standard high pressure configuration today promotes ENE winds and limited clouds. VFR conditions prevail through the rest of today and most of tonight with winds trending toward calm. Expect pockets of renewed fog development late tonight into Wednesday morning which could produce periods of MVFR to IFR visibility reductions. Might also see some low status duct in off the central Lakes which may lead to IFR (or LIFR) restrictions. Otherwise, the dry pattern persists on Wednesday with slightly more cohesive flow organizing out of the north and FEW-SCT high-based cumulus.
For DTW/D21 Convection...No thunderstorms expected through the TAF period.
THRESHOLD PROBABILITIES...
* Low for ceilings at or below 200 feet between 09Z and 13Z Wednesday.
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.PREV DISCUSSION... Issued at 334 AM EDT Tue Sep 16 2025
DISCUSSION...
590 dm upper level high fixated overhead early this morning maintains full control heading into the mid-week period. This stagnant pattern lends to virtually no change in sensible weather conditions through Thursday. Elevated height field contributing to this stretch of higher magnitude warmth will keep projected high temperatures generally within the low to mid 80s. Modest daily moderation of the underlying thermal profile will lend to the warmest conditions arriving Thursday with some upper 80s plausible. Surface high pressure anchored to the north and east favors continued light low level east/northeast flow. This trajectory will continue to draw marine boundary layer moisture inland during the overnight hours, favoring some degree of fog formation. Higher probability for both greater coverage and density will tend reside within a closer proximity to lake Huron and Saginaw Bay.
Northern stream shortwave glancing across the northern great lakes will ease a backdoor cold front southward into central lower Mi Thursday evening and overnight. This frontal zone will linger into Friday, establishing a greater south to north thermal gradient as cooler northeast to east flow engages the marine environment to keep the thumb notably cooler. A brief uptick in frontal convergence with a narrow plume of higher theta-e present could offer an isolated opportunity for shower development as the boundary sags into the region. Otherwise dry conditions hold to finish the week. This boundary washes out as low-mid level ridging again governs conditions heading into the first half of the weekend. Temperatures still edged on the warmer side of average, but muted slightly relative to the warmth noted this week as easterly flow carries greater influence and cloud cover may prove more problematic as high level moisture increases downstream of an inbound mid level wave. Introductory precip chances creep back into the forecast by the end of the weekend and early next week as greater mid level pv intrudes.
MARINE...
A ridge of high pressure continues to bring an extended period of dry weather and lighter winds to the Great Lakes through the week. Winds continue to favor a light easterly component, with some gradual backing to the south expected by tomorrow. A secondary high pressure system is expected to drop from the central Canadian provinces into Ontario and Quebec late this week, which will strengthen the pressure gradient over the Great Lakes region. This will again reinforce northeasterly flow and will bring some elevated wind speeds for Lake Huron where sustained winds nearing 20 knots and gust potential to 25 knots will be possible.
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.DTX WATCHES/WARNINGS/ADVISORIES... MI...None. Lake Huron...None. Lake St Clair...None. Michigan waters of Lake Erie...None. &&
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AVIATION.....KGK DISCUSSION...MR MARINE.......MR
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NWS DTX Office Area Forecast Discussion