textproduct: Detroit/Pontiac

KEY MESSAGES

- Dry weather with mild afternoon highs and cool morning lows will persist into the weekend.

DISCUSSION

Blocking pattern will result in surface high pressure and ridging being entrenched across the Great Lakes yielding quiet weather conditions through the week.

A surface high pressure will move across the northern Great Lakes into Quebec tonight and tomorrow. Light southwesterly winds today will become more east-northeasterly for tomorrow while remaining light. This shift in winds brings the only notable weather item for this forecast, which will be the potential for some isolated areas of patchy shallow fog that may develop with the help of the lake moisture.

Thermal profiles over the course of the week will not change all that much with a persisting warmer airmass that brings temperatures that are a few degrees above climatological norms. Look for afternoon highs mainly in the 60s with overnight lows ranging from the mid-upper 30s to mid 40s.

The active northern stream across central Canada will attempt to send a front into the region. It should weaken as it progresses and only manage to reach the northern Lakes before longwave ridge amplification ramps back up ensuring continued dry and slightly above normal warmth through the end of the week. High pressure centered over eastern Canada will offer potential for slightly cooler temperatures Friday down to 60 with the northerly flow. Temperatures quickly recover as thermal ridge builds back into the Great Lakes for the weekend.

MARINE

The influence of high pressure sustains benign marine conditions this evening and through the week. An uptick in easterly wind occurs across northern Lake Huron Tuesday morning as the center of the high strengthens just north of Georgian Bay, with gusts up to 20 kt. Wind weakens by the afternoon then gradually veers to southwest by Wednesday afternoon. A dry cold front passes through Wednesday night with another broad area of high pressure taking residence through the end of the week.

PREV DISCUSSION

Issued at 118 PM EDT Mon Oct 19 2026

AVIATION...

VFR conditions across the area as high pressure continues to sit overhead. Clear skies today before some cirrus slides in tonight which may continue into Tuesday. Light southwesterly winds today will go calm tonight before becoming northeasterly Tuesday.

D21/DTW Convection...There will be no thunderstorms through the TAF period.

DTW THRESHOLD PROBABILITIES...

* None.

DTX WATCHES/WARNINGS/ADVISORIES

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