Expert Forecast Opinion

199
FXUS63 KDTX 071106
AFDDTX

Area Forecast Discussion
National Weather Service Detroit/Pontiac MI
706 AM EDT Wed Oct 7 2026

.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.

&&

.AVIATION...

VFR conditions are anticipated throughout the period. Moisture
starved midlevels due to residual stability will limit cloud cover
in the 5.0 to 8.0 kft agl layer ahead of an approaching dry cold
front. Southwest winds 10 to 15 knots early will become west to west
northwest late this afternoon with 20 knot gusts possible. Lowering
subsidence post cold front will dry out any lingering moisture below
6.0 ft agl tonight. Persistent west gradient flow tonight
significantly limits any fg/br potential.

D21/DTW Convection...No thunderstorms forecasted during the period.

.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.
&&

$$

AVIATION.....CB
DISCUSSION...SF
MARINE.......KDK


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