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LCZ423 851 Pm Edt Wed Sep 6 2023
.strong Thunderstorms approaching the waters...
the areas affected include...
detroit river... Michigan waters of lake erie...
at 848 pm edt, doppler radar indicated strong Thunderstorms, capable of producing winds to up 30 knots. These Thunderstorms were located along a line extending from 16 nm west of lake erie metropark harbor to 8 nm northwest of Monroe harbor to near luna pier, moving northeast at 20 knots.
strong Thunderstorms will be near, Monroe harbor, bolles harbor of refuge, north cape, luna pier, woodland beach, and detroit beach around 855 pm edt. Stony point around 900 pm edt. Lake erie metropark harbor, estral beach, and gibraltar around 910 pm edt. Detroit river light around 915 pm edt. Elizabeth park marina and wyandotte around 920 pm edt. Grosse ile around 925 pm edt.
other locations impacted by strong Thunderstorms include woodland beach, stony point, gibraltar, estral beach, and detroit beach.
precautionary/preparedness actions...
mariners can expect gusty winds up to 30 knots, locally higher waves, and lightning strikes. Boaters should seek safe harbor immediately until these storms pass.
these strong Thunderstorms will likely produce winds up to 30 knots, and could pose a serious hazard for boaters. A special marine warning may eventually be required when these storms reach the nearshore waters. Boaters should consider heading for shore before these storms arrive.
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lat...lon 4173 8350 4180 8350 4195 8337 4197 8328 4226 8317 4233 8311 4238 8294 4235 8293 4232 8307 4224 8313 4212 8312 4203 8315 4196 8311 4180 8333 4172 8341

LCZ400
No data

FXUS63 KDTX 072029 AFDDTX

Area Forecast Discussion National Weather Service Detroit/Pontiac MI 329 PM EST Thu Dec 7 2023

DISCUSSION

The combination of ongoing warm air advection with help from early December solar insolation has aided in boosting temperatures into the mid to upper 40s this afternoon, low 40s within the Thumb. Dry weather will prevail overnight with lows in the low to mid 30s. The development of low pressure system across the northern Plains and parent wave will amplify the ridge across the Great Lakes tomorrow and will result in an even better push of warmer air which will expand across SE MI, noted by h925 temperatures increasing from 1-2C this afternoon to 5-6C by the same time tomorrow. Expect dry conditions to continue under this stable ridging pattern with warmer temperatures, as highs breach the 50 degree mark.

The upper-level wave which has now arrived onshore above northern California, which will be shortly followed by a 130 knot jet core aloft, will travel into the Four Corners tomorrow afternoon. The arrival of this feature over the Texas Panhandle will draw a weak area of low pressure and a pool of Gulf moisture northeast through Saturday morning and afternoon. The low pressure is expected to track over Lake Michigan, placing SE MI in the warm sector with PW values expanding aoa .75 inches. This process will advect the warmest temperatures of the week starting Saturday morning which will result mild overnight temperatures Saturday morning where forecasted lows hold in the 40s and will boost temperatures into the mid to upper 50s by the daytime. Record high temperatures may be challenged, especially for the Detroit area.

Widely scattered to numerous light rain showers will be possible Saturday morning and afternoon on the nose of the enhanced theta-e gradient as the deep extension of the jet fills in across SE MI, with the higher PoP chances favored over the Tri-Cities given the closer proximity to the low and elevated frontal boundary.
Conditions will be stable enough to hamper mixing depths to minimize the potential of stronger gusts pulling down to the surface in the morning and early afternoon. This does change as low pressure continues to push northeast into Ontario, which will push a strong cold front across the state some time between 18Z Sat - 06Z Sunday, pending timing differences between models. Sounding profiles turn more neutral along the front and mixing depths peak just behind the frontal passage as the jet starts to work out of the Great Lakes.
This small window will be the time where some elevated gusts to or above 35 mph will be possible. There will be continued chances for rain showers with the passage of the front.

Further amplification of the upper-level trough and sheared wave will enhance a baroclinic zone that will align from eastern Texas through the easter Ohio River Valley. The strong moisture axis will reside along or east of this with some low pressure perturbations developing across the Ohio Valley. Latest model guidance continues to support most if not all of this precipitation potential holding southeast of the cwa Sunday morning, but a sub-sample of ensemble members do clip portions of SE MI, generally along of south of a line from Port Huron to Adrian. Temperature profile looks warm enough to support rain for this lingering precipitation potential Sunday morning.

Polar air will fill in across the state on Sunday with h850 temperatures dropping down between -6 to -10C. Lake effect rain/snow showers will become increasingly likely through the day as the cooler air is advected into the region. Temperature highs will drop roughly 20 degrees with a return into the 30s (low 40s over the Metro region) expected Sunday. Lake effect potential will be possible through Monday morning. Medium-range ensemble models are starting to show decent agreement that high pressure fills in through the early and middle of next week, bringing a period of quieter weather.

MARINE

Weak low pressure moves out as an upper level ridge brings warmer and drier conditions to the Great Lakes. The next low pressure system, currently over the Dakotas, begins to influence the region on Friday as a tightening pressure gradient strengthens the wind field. Winds will back to become southerly overnight, ramping up to 15-20 knots during the day Friday. The main low pressure system will move northeast towards the Hudson Bay on Saturday, dragging a cold front and an associated chained low across the lakes, bringing chances for rain. Winds will reach 20-25 knots on Saturday, with gusts having the potential to reach near gale force. However, winds will have some trouble mixing downward during the day Saturday, and model guidance is trending downward in terms of gale potential.
Those factors combined with a limited time frame in which gusts that reach the surface will be gale force, no gale watch will be issued at this time. However, Small Craft Advisories will likely be needed on Saturday. As the low pressure system moves out on Sunday, a broad high pressure will take control and bring a return to drier conditions.

PREV DISCUSSION
Issued at 207 PM EST Thu Dec 7 2023

AVIATION...

Longwave ridging approaching the western Great Lakes promotes column stabilization and VFR conditions through the afternoon and overnight hours with south-southwesterly flow. The next wave lifts out of the Mid-Mississippi Valley Friday morning promoting low-level moisture advection bringing potential for MVFR cloud and -RA or -DZ as the preceding warm front lifts into Southeast Michigan.

DTW THRESHOLD PROBABILITIES...

* Medium for ceiling at or below 5000 feet Friday afternoon.



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

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