Expert Forecast Opinion

268
FXUS63 KDTX 050830
AFDDTX

Area Forecast Discussion
National Weather Service Detroit/Pontiac MI
330 AM EST Thu Nov 5 2026

.KEY MESSAGES...

- Briefly drier to start today before scattered showers return late
today and persist into Friday.

- Temperatures will feel much cooler as highs return to average for
early November.

- Drier weather and above normal temperatures favored for the first
part of next week.

&&

.DISCUSSION...

SE MI resides under the dry slot of northern Great Lakes low
pressure to start the day limiting any precip to isolated pockets of
drizzle. This gradually begins to change through the latter half of
the morning mainly towards the Saginaw Valley/Thumb as southwesterly
winds draw in moisture off Lake Michigan supporting widely scattered
light showers. Chances expand over the southern portions of the CWA
late this afternoon as a lobe of vorticity rounds the trough over
the area providing a bit more lift to squeeze out scattered light
showers which then persist into early tonight. System`s secondary
cold front sweeps across the region early Friday morning offering a
window for better coverage before ushering in a true late fall
airmass to close the week out.

850mb temps fall sub 0C behind the front as troughing sinks over the
central Great Lakes capping highs slightly below average in the 40s
to 50 Friday. The now closed low likewise sinks southeast over lower
MI Friday generating a generally unsettled day with periodic showers
and breezy northwesterly winds making it feel even cooler than the
highs would suggest. Greatest shower coverage/intensity likely
focused over the Thumb as the low center tracks nearby wrapping in
additional lake moisture. Rain chances gradually winds down over the
course of Friday night as troughing shifts towards the eastern Great
Lakes.

Temperatures remain around early November averages Saturday though
will feel cool given the fall thus far. Cloud cover slowly erodes
through the day as surface high pressure/drier air slowly expands
over the region. Ridging then expected to govern conditions through
the first half of the new week promoting another drier stretch and
moderation back above normal temperature-wise.

&&

.MARINE...

The occluded low pressure system continues to stretch and drift
northeast into Ontario and Quebec this morning. The initial cold
front has pulled through the region but the lingering stacked upper
level and surface troughs will remain draped across the region
today. This will keep a southwesterly gradient across the area and
continued gusty winds. Deeper mixing in the wake of the cold front
brings southwest wind gusts to around 25 kt across Saginaw Bay
Thursday so a Small Craft Advisory is in effect through this
evening. A stronger cold front then tracks southward across the
region on Friday. This brings gusty north and northeast wind that
shifts northwest and weakens by Saturday. Additional light rain will
accompany this frontal passage.

&&

.PREV DISCUSSION...
Issued at 1156 PM EST Wed Nov 4 2026

AVIATION...

Upper level trough of low pressure will now be in place over
Southeast Michigan throughout the period. Deepening of the cold air
with time in the lower troposphere will lift ceilings heights to
VFR. Strong midlevel subsidence between 5.0 and 15.0 kft agl will
end widespread precipitation Wrap around moisture advection with
daytime heating is expected to result in diurnal shower development
Thursday afternoon. Most organized of synoptic moisture appears to
pivot into the area Thursday evening.

DTW THRESHOLD PROBABILITIES...

* High for ceiling 5000 ft or less tonight and Thursday.


&&

.DTX WATCHES/WARNINGS/ADVISORIES...
MI...None.
Lake Huron...Small Craft Advisory until 10 PM EST this evening for LHZ421-422.

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

$$

DISCUSSION...KDK
MARINE.......DRK
AVIATION.....CB


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