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FXUS63 KDTX 301039
AFDDTX

Area Forecast Discussion
National Weather Service Detroit/Pontiac MI
639 AM EDT Sat May 30 2026

.KEY MESSAGES...

- Dry conditions through Monday, and likely remaining dry through
Thursday.

- Temperatures briefly drop below normal today, followed by a
gradual warming trend for the latter half of next week.

&&

.AVIATION...

Very strong signal exists that surface high pressure will center
over the western Great Lakes aggregate by this evening. Analysis of
forecasted isentropic surfaces supports active downglide/subsidence
between 850-500mb or between 3.5 to 18.0 kft agl today. Little to no
potential for any boundary layer cloud. Northeast winds will
increase modestly with daytime heating and planetary boundary layer
growth. Surface high pressure will support variable wind directions
this evening likely favoring off of the adjacent Great Lake basins.

D21/DTW Convection...No thunderstorms will occur through the TAF
period.

.DTW THRESHOLD PROBABILITIES...

* None.

&&

.PREV DISCUSSION...
Issued at 338 AM EDT Sat May 30 2026

DISCUSSION...

Model consensus continues to support dry conditions through Monday
and likely through Thursday. Temperatures briefly drop below normal
today, followed by a gradual warming trend for the latter half of
next week with highs rising +1 sigma above normal.

The well advertised Omega Block remains intact today as the
shortwave feature within the eastern trough exits into the Atlantic.
Meanwhile, a low-level anticyclone moves in from the north,
reinforcing the post-frontal cool and stable airmass associated with
ENE flow. In addition to veered winds, surface dewpoints have
dropped significantly in the wake of the front, from the upper 40s
to upper 20s/lower 30s. Gustiness should wane during the course of
the morning, with just a slight uptick again this afternoon downwind
of Lake Huron where lower column flow will be slightly more
elevated, along with steeper low-level lapse rates. Active
subsidence aids in the development of 1025 mb surface high pressure
centering over The Straits with influence extending across most of
the state into Sunday. Thermodynamically, the lake-modified airmass
limits highs to a few degrees below normal, mainly in the low 70s.

The longwave ridge will take precedence over Southeast Michigan on
Sunday as a split-flow configuration emerges aloft. The surface
ridge will drift slightly south and become more diffuse during the
afternoon, as reflected in the relaxation surface pressure gradient.
Temperatures return to near-normal with strong insolation potential.
The next embedded speed max within the eastern trough drops in from
Hudson Bay late Sunday into Monday. As discussed previously,
insignificant moisture advection precludes precipitation concerns
once the arc of CVA crosses through. Increasing confluence aloft and
the redevelopment/amplification of the longwave ridge axis through
the first half of the week should maintain rain-free conditions with
a steady warming trend. Highs could break into the 80s again by the
latter half of the week.

MARINE...

Post-frontal northeast flow has led to a breezy overnight period,
but winds will gradually subside through the morning. This allows
winds and waves to subside below Small Craft Advisory thresholds by
mid-morning. Wind gusts may briefly touch 25 knots again this
afternoon over Inner Saginaw Bay where water temperatures are warmer
and flow aligns with the long axis of the bay. Otherwise, high
pressure builds in from Canada affording an extended stretch of
quiet and dry marine weather well into next week.

&&

.DTX WATCHES/WARNINGS/ADVISORIES...
MI...None.
Lake Huron...Small Craft Advisory until 8 AM EDT this morning for LHZ421-422-441-
442.

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

$$

AVIATION.....CB
DISCUSSION...KGK
MARINE.......MV


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