Sunrise 6:24 AM   Sunset 8:19 PM Moonrise 8:30 PM   Moonset 5:34 AM

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LHZ463 Expires:202404250345;;307956 Fzus63 Kdtx 241934 Glflh
open lake forecast for lake huron national weather service detroit/pontiac mi 334 pm edt Wed apr 24 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 - High pressure, 30.40 inches, will settle in across the great lakes tonight through tomorrow. Wind speeds will decrease through tonight as a result, with lighter winds holding tomorrow. Low pressure, 29.30 inches, then moves from the texas panhandle into the western portion of the midwest through Friday. This will strengthen the pressure gradient across the great lakes, bringing breezy southeast to southerly flow.
lhz363-462>464-250345- lake huron from sturgeon point to alabaster mi beyond 5nm off shore- 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- 334 pm edt Wed apr 24 2024
Tonight - North winds 10 to 15 knots becoming northeast 5 to 10 knots in the late evening and early morning - .then veering to the east early in the morning. Waves 4 to 6 feet subsiding to 2 to 4 feet early in the morning. Waves occasionally around 8 feet. Thursday - East winds 5 to 10 knots backing to the north late in the afternoon. Waves 2 feet or less. Thursday night - Northeast winds 5 to 10 knots veering to the southeast after midnight. Waves 2 feet or less. Friday - Southeast winds 5 to 10 knots increasing to 10 to 15 knots in the late morning and afternoon. Waves 1 to 3 feet. Friday night - East winds 10 to 15 knots becoming southeast 20 to 25 knots with gusts to around 30 knots. A chance of showers in the evening - .then showers after midnight. Waves 3 to 5 feet building to 6 to 9 feet after midnight. Waves occasionally around 12 feet. Saturday - South winds 20 to 25 knots with gusts to 35 knot gales decreasing to 15 to 20 knots late in the afternoon. Showers in the morning - .then a chance of showers. Waves 8 to 12 feet subsiding to 5 to 7 feet late in the evening. Waves occasionally around 15 feet. Sunday - Southwest winds 10 to 15 knots becoming southeast 5 to 10 knots early in the evening - .then becoming east 10 to 15 knots in the late evening and early morning. A chance of showers. Waves 3 to 5 feet subsiding to 1 to 3 feet until early morning. Monday - South winds 10 to 15 knots. A chance of showers early in the morning. Rain showers likely until early evening - .then a chance of showers and Thunderstorms in the late evening and early morning. Waves 2 to 4 feet.

LHZ400
No data

FXUS63 KDTX 242253 AFDDTX

Area Forecast Discussion National Weather Service Detroit/Pontiac MI 653 PM EDT Wed Apr 24 2024

KEY MESSAGES

- A Freeze Warning is in effect for all of southeast MI tonight through early Thursday morning as temperatures dip into the mid to upper 20s.

- Dry conditions with a warming trend bring high temperatures to the 50s on Thursday and 60s on Friday.

- Showers are likely Friday night with windy and warm conditions this weekend. There is low confidence in shower and thunderstorm potential latter half of Saturday and Sunday.

AVIATION

High pressure across the northern Great Lakes will expand across southern Michigan tonight. An ongoing influx of very dry air from the north has effectively scoured out the low clouds at the TAF sites. This dry air will ensure clear skies tonight and Thursday.
The loss in daytime heating will reduce the wind speeds to under 7 knots after 00 or 01Z. The gradient will remain light through the day Thursday, supportive of east-southeasterly winds under 10 knots.

DTW THRESHOLD PROBABILITIES...

* None.

PREV DISCUSSION
Issued at 312 PM EDT Wed Apr 24 2024

DISCUSSION...

Mid-level height recovery is well underway today with the departure of the trough axis toward the mid-Atlantic as surface high pressure builds in from northwestern Ontario. Strengthening subsidence combined with significant dry air advection (dewpoints falling to around 20F) has supported rapid north to south clearing trends since late this morning. Southern areas still beneath the lingering stratus/stratocu will see clearer skies by this evening. Very favorable radiative cooling set up tonight with surface high pressure keeping winds light and variable in addition to the drier airmass being firmly in place with model PWATs advertised near daily climo mins of ~0.10". All of southern lower MI remains under a Freeze Warning tonight as a result as lows, outside of Detroit proper and the immediate lakeshores, drop into the mid to upper 20s (~25-28F).

Temperature moderation is muted Thursday as upper level/thermal troughing lingers over the central Great Lakes holding 925mb temps in the low single digits (C) supporting continued below average highs in the mid 50s (lower 50s more likely downwind of the lakes).
That said, with surface high pressure still in place overhead, dry airmass and weak gradient results in a sunny day with lighter southeasterly wind. Pattern shift occurs going into Friday as upper ridging over the Plains shunts thermal troughing east setting up southerly lower level return flow. 850mb temps climb by 8-10C from Thursday evening to Friday evening allowing highs to climb back into the 60s.

WAA is further strengthened by late Friday evening as the elevated portion of a surface warm front lifting out of the Ohio Valley reaches southern lower MI. Front marks the lead edge of the warm conveyor originating out of the western Gulf tied to broad low pressure over the central Plains. ~50kt LLJ accompanies this frontal boundary resulting in impressive moisture advection into southern lower MI as PW values quickly rise from <0.25" Friday afternoon to >1" by late Friday night-early Saturday morning. Confidence remains high on widespread showers overnight Friday into the first half of the day Saturday as the surface front works north through the area.
Latest 12Z model guidance has hinted more at weak elevated instability (<500J/kg) being able to creep north into SE MI late Friday night with lapse rates steepening to between 6-6.5C/km Saturday morning. While thermodynamic ingredients are not particularly robust, the addition of respectable lift along the frontal boundary lends a bit more confidence in the chance for a few embedded thunderstorms during this timeframe. Any that manage to develop are not expected to be severe at this time given their likely elevated nature and very marginal mid-level lapse rates.

Second half of the day Saturday looking to have a good shot at being mostly if not entirely dry once the surface front clears to the north, entrenching the area within the system's warm sector as mid- level nudges in from the Tennessee/Ohio valleys. This sector holds over the region through Sunday as a secondary low develops along the first system's cold front over the Plains briefly stalling this frontal boundary's translation east. With this persistent WAA into SE MI, 850mb temps climb into the mid teens (C) supporting highs well into the 70s if not cracking 80 in the southern half of the CWA on Sunday, especially if mid-level capping holds preventing convection from cropping up. Secondary low is progged to lift into the northern Great Lakes Monday easing the cold front through the state over the course of Monday afternoon into early Monday night with widespread showers/storms in advance.

MARINE...

High pressure will settle in over the Great Lakes tonight through tomorrow, which will gradually reduce winds speeds, bringing light winds through Friday morning. High pressure will then settle across New England on Friday with return flow from the high supporting southeast flow across the Great Lakes through the day. Wind speeds are expected to increase Friday and Saturday morning as a result of the pressure gradient strengthening in response to a low pressure system filling in across the Midwest. Gusts just below gales will be possible across portions of Lake Huron during this time frame, however, extremely stable over-lake conditions should help prevent sustained mixing of the stronger winds aloft. Showers and thunderstorms will also be possible late Friday into Saturday, along a warm front.

DTX WATCHES/WARNINGS/ADVISORIES
MI...Freeze Warning from midnight tonight to 8 AM EDT Thursday for MIZ047>049-053>055-060>063-068>070-075-076-082-083.

Lake Huron...Small Craft Advisory until 10 PM EDT this evening for LHZ421-422- 441>443.

Lake St Clair...Small Craft Advisory until 10 PM EDT this evening for LCZ460.

Michigan waters of Lake Erie...None.

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