Willis, Michigan Weather Forecast Discussion

517
FXUS63 KDTX 111806
AFDDTX
Area Forecast Discussion
National Weather Service Detroit/Pontiac MI
206 PM EDT Thu Sep 11 2025
.KEY MESSAGES...
- Dry today and Friday with above normal high temperatures, but
areas of fog appear likely tonight.
- Chance of showers and slight chance of thunderstorms Saturday.
- Warm and dry Sunday through Wednesday.
&&
.AVIATION...
High pressure over Ontario continues to dominate the region,
bringing light winds at or below 6 knots and fair weather cumulus.
The diurnal cumulus will dissipate this evening as we lose daytime
heating. With another night of clear skies and strong radiational
cooling, expect the potential for patchy fog. Did maintain the
TEMPO IFR mentions of BR between 09Z-13Z Friday morning.
For DTW/D21 Convection... No thunderstorms throughout the period.
THRESHOLD PROBABILITIES...
* None.
&&
.PREV DISCUSSION...
Issued at 312 AM EDT Thu Sep 11 2025
DISCUSSION...
The upper-level ridge axis over the Western Great Lakes will extend
into the Central Great Lakes this evening, with 500 MB heights
reaching 584 DAM and holding through Friday. This should ensure dry
conditions with a modest warming in the low levels each day as 850
MB temperatures are expected to reach around 12 C Thursday, and then
reach and slightly exceed 13 C on Friday. Thus, temperatures in
the low to mid-80s seem reasonable on Friday (assuming morning fog
burns off in a timely fashion).
A strong PV anomaly/upper level low is on track to move through
Hudson Bay on Friday and into Quebec on Saturday. Southeastern
Michigan will be on the western fringe of the large trough that will
sink south through New England and eastern Great Lakes on Saturday.
A tight baroclinic zone is setting up with compressional warming on
the lee side of the Rockies ejecting northeast from the Central
Plains. There is a chance for showers and possible thunderstorms on
Saturday as a shortwave moves out of the northern Rockies and tracks
through the region. However, the exact track, position, and amount
of instability and steepness of mid level lapse rates remain in
question. The NAM is one most aggressive solutions, with not a whole
lot of support from other solutions. NBM pops is still indicating
only a chance of precipitation.
The summer-like upper level ridge axis is still on track to move
overhead for Sunday and Monday. 500 MB heights are projected to reach
590 DAM (supported by Euro ensembles), and center of the ridge may
hold in place through mid week, leading to dry and warm conditions
Sunday-Wednesday.
MARINE...
High pressure drifts from Ontario to New England today and tomorrow,
ensuring dry and calm marine conditions to end the work week. Light
NE winds gradually veer to the SW by Friday as the high departs. SW
flow advects elevated portions of a warm front into the area Friday
afternoon, introducing low end shower chances Friday night into
Saturday although better rain chances stay over Lake Michigan. High
pressure then builds back into Ontario early next week, complemented
by ridging aloft, to continue the stretch of favorable marine
weather.
&&
.DTX WATCHES/WARNINGS/ADVISORIES...
MI...None.
Lake Huron...None.
Lake St Clair...None.
Michigan waters of Lake Erie...None.
&&
$$
AVIATION.....JA
DISCUSSION...SF
MARINE.......MV
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NWS DTX Office Area Forecast Discussion