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LCZ460 Lake St Clair- 334 Am Est Sun Dec 10 2023
Today..Southwest winds 10 to 15 knots. Mostly cloudy. Scattered light snow showers in the afternoon. Waves 2 feet or less.
Tonight..Northwest winds 10 to 15 knots. Cloudy. Scattered light snow showers in the evening. Waves 2 feet or less.
Monday..West winds 10 to 15 knots. Mostly cloudy. Waves 2 feet or less.
Monday night..West winds 10 to 15 knots becoming southwest 20 to 25 knots. Partly cloudy. Waves 1 to 3 feet.
Tuesday..Southwest winds 20 to 25 knots becoming west 15 to 20 knots in the afternoon and evening. Mostly Sunny in the morning becoming partly cloudy. Waves 2 to 4 feet subsiding to 1 to 3 feet in the afternoon and evening.
Wednesday..West winds 15 to 20 knots. Mostly clear. Waves 2 feet or less.
Thursday..Southwest winds 10 to 15 knots. Clear. Waves 2 feet or less.

LCZ400
No data

FXUS63 KDTX 102129 AFDDTX

Area Forecast Discussion National Weather Service Detroit/Pontiac MI 429 PM EST Sun Dec 10 2023

DISCUSSION

Neutrally tilting shortwave with finer embedded trough features crosses Lower Michigan this evening supporting some light shower activity amidst background lake-effect evapotransport. Low-level wind fields hold a northwesterly vector into the overnight hours before the final packet of CVA exits the state. Adjusted the forecast in favor of sprinkle and/or flurry mentions tonight as temperatures have largely overachieved, but with colder nocturnal air inbound, expect the cloud-bearing saturated layer to settle into the warmer end of the DGZ by 03Z. This supports a transition to isolated flurries for the overnight period. Temperatures drop into the 20s across the forecast area by daybreak.

Heights rebound locally Monday as PV consolidates to the east yielding increasingly stable conditions over the region. The upper level pattern becomes ridged over for approximately 24 hours offering dry and seasonably cool conditions. Forecast soundings indicate deep-layer subsidence by the afternoon and the eventual erosion/scattering of low stratus. Zonal low-level winds back to follow suit in the mid to upper levels during the overnight period as high clouds eventually spill in ahead of the next wave.

Upper low over Manitoba digs into northern Ontario Tuesday shoving an arctic airmass into the northern Great Lakes. The flanking frontal boundary extends well into the Ohio Valley, while the 850 mb thermal gradient suggests a spread in high temperatures Tuesday afternoon from northwest to southeast (upper 30s and lower 40s, respectively). Moisture quality concerns remain as peak PWATs within the pre-frontal ThetaE wedge remain 10-20 percent below climatological normals and soundings appear subsaturated wrt ice on either side of the 2-4 kft AGL layer. Wouldn't be surprised if a few flurries materialize given the low-level FGEN response through the stratocumulus deck, but not worth a mention in this outgoing forecast.

Surface high pressure slides out of the Eastern Plains and repositions over the Ohio Valley Wednesday maintaining column dryness. A thermal ridge spilling out of the Canadian Prairies moderates as it folds into the Midwest Thursday and Friday while 850 mb temps are now projected to hold AOB 5 C. This still translates to higher than normal temperatures, approaching 10F above. A frontal passage Saturday provides an opportunity for precipitation, but the GFS and ECMWF maintain large spatial variance with the next wave.

MARINE

Cold thermal trough is centered over the Great Lakes Region today with an expansive frontal system moving towards the Atlantic Coast.
A weaker trailing frontal boundary is moving across the central Great Lakes this afternoon with a northwest post frontal wind direction. Cold air and some mid level shortwave support will bring lake effect snow showers for Lake Huron through this evening. The northwest flow will will build waves into the nearshores of the northern Thumb by tomorrow morning. This will bring marginal small craft advisory conditions as wind gust potential will top out around 20 knots. Overall lighter period of winds for the daylight period tomorrow. Southwest winds are then expected to ramp up Monday night through Tuesday morning as the next strong low pressure system moves across northern Ontario and drags a cold front through the region.
The potential for a period of gales will exist Tuesday morning and early afternoon for portions of Lake Huron. Cold air and a tight pressure gradient will maintain unsettled marine conditions into Wednesday with gusts of 25-30 knots common across much of Lake Huron.

PREV DISCUSSION
Issued at 1213 PM EST Sun Dec 10 2023

AVIATION...

Expansive area of low stratus will hold firm through the late day period, as the passage of a surface trough solidifies a moist low level environment within ongoing lake moisture flux. Latest observational trends suggest some variability in ceiling height between low VFR and MVFR can be expected. The passage of the trough combined with daytime heating will bring potential for a few inconsequential widely scattered light rain/snow showers, although confidence in occurrence remains low attm. Prevailing westerly winds becoming northwesterly with the trough passage. Plausible a few lake effect snow showers manifest overnight, although with a less favorable northwest trajectory likely limiting both coverage and intensity.

For DTW...main window for possible light rain or melting snow showers will exist between 21z-01z. Any disruption to visibility should remain quite brief given the limited intensity/duration.

DTW THRESHOLD PROBABILITIES...

* High for ceilings aob 5000 feet through this evening. Medium tonight and Monday.

* High for precip type as rain/melting snow through this evening.
Ptype of snow overnight/Monday morning.



DTX WATCHES/WARNINGS/ADVISORIES
MI...None.
Lake Huron...None.
Lake St Clair...None.
Michigan waters of Lake Erie...None.

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