textproduct: Detroit/Pontiac

KEY MESSAGES

- Warm today with highs well into the 70s.

- Dry conditions with cool to seasonable temperatures Thursday and Friday; chilly Thursday night with lows in the upper 30s to lower 40s.

- Much warmer Saturday with temperatures in the upper 70s to around 80 degrees.

- Next significant chance of rain arrives for the second half of the weekend.

DTW THRESHOLD PROBABILITIES

* Low for ceiling at or below 5000 feet Wednesday.

PREV DISCUSSION

Issued at 243 AM EDT Wed Oct 7 2026

DISCUSSION...

Copious amounts of upper level energy over central Canada will lead to a pronounced upper level trough over the Great Lakes and particularly over New England on Thursday. The 00z DTX Raob revealed a 500 MB Height of 574 DAM. Heights look to fall and bottom out around 558 DAM over central sections of the CWA Thursday morning, per 00z Euro. Today will be a mild day ahead of a mostly dry cold front tracking through. An 850 MB thermal ridge of 12 to 15 C translate through during the mid-day, but mixing depths more than likely come up short, maintaining highs well into the 70s, supported by 925 MB temps of 17 to 18 C. An upper level jet streak racing through northern lower Michigan offers up a slight chance of showers across the northern half of the CWA, as 700/500 MB cold pools (-6 C/- 24) track across. Mid level lapse rates will be steep, and moisture enhancement from Saginaw Bay/Lake Huron certainly seems sufficient, with even isolate thunderstorms possible over Lake Huron with capes aoa 500 J/kg.

A cool-down is expected to end workweek as 850 MB temps bottom out at 3 to 4 C Thursday night. There is some concern for temps to reach into the low to mid 30s, although with the center of high pressure over the Ohio Valley, winds may fail to fully decouple, keeping mins elevated in the upper 30s to lower 40s.

An active weather pattern as we head into the weekend. A strong warm front over the Central Plains/Midwest Thursday lifts through the Great Lakes regions Friday night. A low level jet core (45+ knots) looks to track through northern Lower Michigan, with the showalter index only at zero or slightly negative. Thus, euro ensembles suggesting just a 30 to 40 percent chance of showers. Outgoing NBM pops are below 14 percent, and probably ok as long as the jet core tracks farther north.

Really impressive warm air/ridging building in on Saturday ahead of the soon-to-be-named TS Isaias coming out of the western Gulf Coast states Saturday night. 850 MB temps advertised to reach near 20 C over Lower Michigan Saturday evening. High temperatures aoa 80 degrees come into play, per euro ensembles. Record highs for the day reside in the mid 80s for reference. Based on the pressure gradient/pattern, looks like Tri-Cities/Flint Vicinity are set up for the warmest readings.

The second half of the weekend into Monday could be very wet, as the hurricane center official track brings the remnants of the tropical system into the central Ohio Valley by Sunday evening, in line with the Euro solution. NBM pops are taking a more conservative approach for Sunday through Sunday night. Still, there are too many variables (such as strength, areal size, and potential deflection to the east by the time it reaches this latitude) this far out to make the call one way or the other.

MARINE...

Moderate to strong southwesterly winds gradually weaken through the morning as northern Ontario low pressure pivots into the James Bay slackening the local gradient. Surface cold front set to cross the central Great Lakes over the course of the day today though with a weaker gradient, northwesterly winds favored to only peak in the 20kt range- strongest over northern Lake Huron. Reinforcing mid- level disturbance arrives over the Great Lakes Wednesday night deepening mid-upper troughing overhead leading to an uptick in NW winds towards 30kts for northern Huron for Thursday. Midwestern surface high pressure eventually builds into the central lakes Thursday night-Friday promoting diminishing winds to close out the week.

DTX WATCHES/WARNINGS/ADVISORIES

MI...None. Lake Huron...Small Craft Advisory until 10 AM EDT this morning for LHZ421-422- 441.

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