textproduct: Detroit/Pontiac
This forecast discussion was created in the public domain by the National Weather Service. It can be found in its original form here.
KEY MESSAGES
- Areas of fog tonight.
- Mild and dry through the week.
DISCUSSION
Longwave ridging in place over much of the southern two thirds of North America will persist through the upcoming weekend and into the beginning of next week. The weather narratives are: continuing dry weather, daytime highs some 5 to 10 degrees above normal, and near normal low temperatures. Plenty of sunshine is expected. The flow pattern is projected to be quite weak over the next 5 days which brings the potential for fog and br during each of the nighttime and daybreak periods. Overall likelihood of fog during any particular morning will be dependent on flow direction and whether a location will be directly downstream of the Great Lakes. Introduced patchy fog in the forecast for the morning period Thursday through Monday.
The only minor blip to the ridging will be a weak surface trough extending southward from the Hudson Bay. Forecast data supports the the weak trough or saddlepoint pushing through the area between 06- 12z tonight. The change to the sensible weather will be a prevailing easterly wind direction that will set up post weak front Thursday.
MARINE
A weak surface trough will push through the Lake Huron and Lake Erie basins early Thursday. A lack of a strong wind field aloft and a weak surface pressure gradient will lead to a negligible wind response in the post frontal environment early in the day. By Thursday afternoon, a more organized easterly flow trajectory will arise in response to the center of surface high pressure building from Quebec into upstate New York. Windspeeds of less than 20 knots are anticipated through Saturday.
PREV DISCUSSION
Issued at 116 PM EDT Wed Oct 21 2026
AVIATION...
High pressure remains in place again today maintaining sunny skies and light winds. A washing out cold front over the northern Great Lakes reaches the area late evening but only is marked by an increase high (cirrus) cloud and a shift to light northwest turning northerly winds. Signal isn't as strong for fog development tonight though will maintain inherited tempos for FNT/MBS where potential is best.
D21/DTW Convection... Thunderstorms are not forecast 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.
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