Sunrise 6:22 AM   Sunset 8:31 PM Moonrise 1:39 AM   Moonset 10:19 AM

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LHZ463 Expires:202405010345;;390050 Fzus63 Kdtx 301938 Glflh
open lake forecast for lake huron national weather service detroit/pontiac mi 338 pm edt Tue apr 30 2024
for waters beyond five nautical miles off shore on lake huron
waves are the significant wave height - the average of the highest 1/3 of the wave spectrum. Occasional wave height is the average of the highest 1/10 of the wave spectrum.
Synopsis - A weak surface ridge will be over the central great lakes this evening, providing light and variable winds tonight. Another low, 29.60 inches, moves through lake superior for Wednesday. An increase in south-southwest winds will occur tomorrow, with peak wind gusts in the 20 to 25 knot range.
lhz462>464-010345- lake huron from port austin to harbor beach beyond 5nm off shore- lake huron from harbor beach to port sanilac beyond 5nm off shore- lake huron from port sanilac to port huron beyond 5nm off shore- 338 pm edt Tue apr 30 2024
Tonight - Light and variable winds 10 knots or less. Waves 2 feet or less. Wednesday - Southeast winds 5 to 10 knots becoming south 10 to 15 knots in the late morning and afternoon. Waves 1 to 3 feet building to 2 to 4 feet in the afternoon. Wednesday night - West winds 10 to 15 knots decreasing to 5 to 10 knots after midnight. Waves 2 to 4 feet subsiding to 1 to 3 feet in the late evening and overnight. Thursday - West winds 5 to 10 knots. Waves 2 feet or less. Thursday night - Northeast winds 5 to 10 knots veering to the east after midnight. Waves 1 to 3 feet. Friday - Southeast winds 10 to 15 knots becoming east 5 to 10 knots late in the evening. A chance of showers. A chance of Thunderstorms late in the afternoon. Waves 1 to 3 feet. Saturday - North winds 5 to 10 knots veering to the east in the late evening and early morning. A chance of showers early in the morning. Waves 2 feet or less. Sunday - South winds 5 to 10 knots veering to the southwest in the late morning and early afternoon - .then veering to the north until early morning. A chance of showers until afternoon. Waves 2 feet or less.

LHZ400
No data

FXUS63 KDTX 302315 AFDDTX

Area Forecast Discussion National Weather Service Detroit/Pontiac MI 715 PM EDT Tue Apr 30 2024

KEY MESSAGES

- Gusty southwest winds Wednesday.

- Well above normal temperatures remain through the week.

- Likely a dry frontal passage on Wednesday with the next chance of precipitation arriving early Friday morning.

AVIATION

Clouds are rapidly dissipating across the Saginaw Valley and Thumb regions - while elsewhere the residual limited diurnal cumulus are also vanishing. The reduction in boundary layer mixing will also temper winds quickly early this evening. A steady southerly flow will emerge post-sunrise Wednesday and will mix to southwesterly along and behind a warm front by noon with a notable increase in gusts once again. Gusts are expected to approach 30kt at mbS with more around 25kt for the Detroit terminals.

There will be some remnant mid-cloud Wednesday morning from the ongoing convection upstream over Iowa. Additionally, the increase in near surface moisture along the warm front will support a window of high based (VFR) cumulus development during the midday.

For DTW/D21 Convection...Thunderstorms are not expected through the TAF period. West-southwest gusts are expected to be around 25kts mid- afternoon Wednesday. If gusts closer to 30kt are realized, crosswinds may become a minor concern.

DTW THRESHOLD PROBABILITIES...

* Low for crosswinds late Wednesday afternoon.

* Low for ceilings at or below 5kft Wednesday midday.

PREV DISCUSSION
Issued at 352 PM EDT Tue Apr 30 2024

DISCUSSION...

The dense stratocumulus cloud line this afternoon is generally west to east along or just south of the M 46 corridor. There could be some slight additional development along the southern edge, but current observation trends suggest a persistence forecast throughout the remainder of the afternoon for the majority of the area. Did try to hand edit some temperature grids to account for temperatures that are cooler under the opaque overcast. Favorable radiative cooling conditions tonight and low dewpoint airmass will support lows down into the 40s, a few colder spots in the outlying low drainage areas.

Strong synoptic support for ascent and a reasonably dynamic low pressure system is forecasted to push across northern Wisconsin/U.P.
and Lake Superior early Wednesday. The main narrative will be dry conditions for Southeast Michigan as a large amount of static stability will hold between 3.0 and 12.0 kft agl. A notable disconnect in moisture between the mid to low levels with surface moisture will be well lagged and late in the day. From a sensible weather perspective on the ground, warmer and more humid conditions are expected during the afternoon. Surface dewpoints are expected to rise from 40s early Wednesday to the middle 50s between 18-21Z. A rare, dry warm advection/cold front system for Southeast Michigan

Longer wavelength ridging is forecasted to develop over the central Great Lakes Thursday before amplifying over the eastern United States on Friday. Strong static stability is expected to hold while lowering on Thursday leading to very comfortable weather. The exception will be areas adjacent to Lake Huron on Thursday with highs in the 50s to lower 60s.

The next chance for precipitation will come Friday as a deamplifying shortwave is forecasted to lift out of the Mississippi River Valley.
Large scale forcing for ascent will be well to the northwest of Lower Michigan with the forecast area solidly in anticyclonic flow trajectories. There is some potential for elevated showers/rumble of thunder late Thursday night with nocturnal moisture transport/LLJ forcing but higher chance should reside north of Saginaw Bay. Model consensus brings the best potential along and ahead of the surface cold Front Friday afternoon. Surface temperatures are forecasted to warm in the upper 70s with surface dewpoints making a run at 60 degrees. From this vantage point, quality of lower tropospheric moisture is expected to remain compromised as background large scale forcing favors ridging which will try to perpetuate a veered wind profile. Model differences to exist and some adjustment to forecasted thunderstorm expectations are still anticipated.

Differential cold/dry air advection with rising geopotential heights will result in building high pressure for next weekend. Comfortable conditions are expected with conditions some 10 degrees above normal.

MARINE...

Surface ridge in place this evening will provide light and variable winds tonight before south-southwest winds increase tomorrow, ahead of the next low pressure system which will track through Lake Superior.

Wind gusts Wednesday afternoon do look to reach 20-25 knots over the nearshore waters, especially over Saginaw Bay and along the shoreline areas. However, banking on the warm air (925 mb temps up to 17 C) ahead of the cold front to provide just enough stability to keep gusts under 25 knots (outside of perhaps a brief stray one).
Winds veering to the west over Saginaw Bay by early evening will also help to keep wind speeds in check, vs the more favorable southwest wind.

Steady stream of cold advection behind the front Wednesday night into Thursday, and outside of the north half of Lake Huron, expecting wind speeds look to remain light, under 20 knots. Even over northern Lake Huron, wind speeds look to peak at 25 knots to perhaps up to 30 knots, centered around midnight per local probabilistic guidance.

A return to light and variable winds for Thursday as surface high builds over Lake Huron.

DTX WATCHES/WARNINGS/ADVISORIES
MI...None.
Lake Huron...Small Craft Advisory from noon to 8 PM EDT Wednesday for LHZ421-422- 441.

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

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