Tuesday, July27, 2021
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Marine Weather and Tides
Grosse Pointe Woods, MI

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:17AMSunset 8:58PM Tuesday July 27, 2021 1:14 AM EDT (05:14 UTC) Moonrise 10:24PMMoonset 9:05AM Illumination 92% Phase: Waning Gibbous; Moon at 18 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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LCZ460 Lake St Clair- 353 Pm Edt Mon Jul 26 2021
Tonight..Light and variable winds becoming southwest 5 to 10 knots in the late evening and overnight. Clear. Waves 2 feet or less.
Tuesday..West winds 5 to 10 knots. Partly Sunny. Waves 2 feet or less.
Tuesday night..North winds 5 to 10 knots veering to the northeast in the late evening and overnight. Mostly clear. Waves 2 feet or less.
Wednesday..Northeast winds 5 to 10 knots early in the morning becoming light and variable. Mostly Sunny. Waves 2 feet or less.
Wednesday night..South winds 5 to 10 knots. Mostly cloudy. A chance of showers in the evening...then showers likely and a chance of Thunderstorms after midnight. Waves 2 feet or less.
Thursday..Southwest winds 5 to 10 knots veering to the northwest in the afternoon and evening. Mostly cloudy becoming partly Sunny in the afternoon becoming mostly clear. A chance of Thunderstorms in the morning. Showers likely. Waves 2 feet or less.
Friday..Northeast winds 10 to 15 knots. Clear. Waves 2 feet or less.
Saturday..West winds 5 to 10 knots. Mostly clear. A chance of showers. Waves 2 feet or less.
LCZ460 Expires:202107270815;;497584 FZUS63 KDTX 261953 GLFSC Lake St Clair Forecast National Weather Service Detroit/Pontiac MI 353 PM EDT Mon Jul 26 2021 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, 30.00 inches will hold across the Ohio Valley through the afternoon and evening today which will bring quieter weather to the marine areas through the remainder of the day. A cold front will then move across Lake Huron late tonight and overnight, which will result in a subtle shift in wind direction from the north as the front passes. High pressure, 30.00 inches, then settles over the Great Lakes behind the front on Wednesday. LCZ460-270815-


7 Day Forecast for Marine Location Near Grosse Pointe Woods, MI
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location: 42.43, -82.9     debug


Area Discussion for - Detroit/Pontiac, MI
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FXUS63 KDTX 270359 AFDDTX

Area Forecast Discussion National Weather Service Detroit/Pontiac MI 1159 PM EDT Mon Jul 26 2021

AVIATION.

Remnants of an MCS now over the UP/northern WI will dissipate as it moves into the area late tonight/early Tuesday morning with shower activity most likely in KMBS and perhaps KFNT/KPTK. Additional scattered convection will be possible in the afternoon as boundary from this overnight activity acts as low level focus. Will include prob30 for shras KPTK north, but may very well end up with a bit better tsra coverage than that (although that seems more likely over towards the Thumb).

DTW THRESHOLD PROBABILITIES.

* None.

PREV DISCUSSION. Issued at 351 PM EDT Mon Jul 26 2021

DISCUSSION .

Dry weather holds for the remainder of today before the MN shortwave rides along an upper trough into northern MI late tonight. Upstream convection is expected to develop over the Upper Great Lakes late this evening and ride along the cold front into northern MI overnight before reaching the Saginaw Valley/Thumb areas by Tuesday morning. This storms will outrun their moisture/instability source as the moisture advection currently ongoing across the Midwest doesn't begin over southern MI until later in the day Tuesday. Because of this, convection is expected to fizzle during the morning across the northern portions of the CWA. The cold front still looks to stall over SE MI during the afternoon Tuesday becoming the focal point for additional scattered shower and storm development. Hi-res guidance keeps hinting at the boundary stalling somewhere north of M- 59 which places "best" precip chances across the northern half of the CWA (along and north of the M-59 corridor). Best is in quotes as chances are not particularly high as trends in guidance keeps the richer theta-e plume to our west over WI and south over IL/IN limiting the abundance of moisture over SE MI (dewpoints still look to make a run into the mid 60s). Will maintain chance-scattered PoPs for areas north of M-59 and slight chance-isolated south. Can't completely rule out a stronger to borderline severe storm with this evening convection as a jet streak approaches the region from the NW increasing 0-6km bulk shear values up around 40kts. Mid-level lapse rates are decent enough in the 6-7C/km range. Limiting factor is looking to be instability with MLCAPE only peaking around 1000 J/kg at most (CAMs today have trended down compared to last night). Overall its very marginal severe chance and SPC has pulled SE MI out of the marginal risk.

The jet streak helps to shunt the cold front along into OH by early Wednesday ahead of the next system developing of the upper Midwest. This shortwave will be stronger than the Tuesday shortwave and drives a strong cold front south through SE MI daytime Thursday. A reinforcing surge of moisture reaches SE MI ahead of the cold front Wednesday night allowing dewpoints to reach into the low 70s daytime Thursday. With that amount of moisture in place, the environment is supportive of rainfall rates exceeding 1"/hr. Some of the mid-range model solutions try to get a strip higher QPF (1"+) across lower MI however there is extreme variability in placement ranging from the Thumb to I-75 corridor to over West Michigan. Too much uncertainty at this point try and nail down QPF but it should be noted the potential for heavy rainfall will exist as showers and storms cross SE MI Thursday. A cooler, less humid airmass follows the frontal passage as 850mb temps drop to 7-9C Friday. This airmass settles over the central Great Lakes through the weekend as an upper trough digs south across the region. Below average highs can be expected during this period.

MARINE .

High pressure in place across the southern Great Lakes and Ohio Valley to bring continued favorable marine conditions for the remainder of the day as winds remain light across the marine areas. A cold front to then pass late tonight through Tuesday morning which will bring likely showers and some thunderstorms across Lake Huron through the morning. Specifically, shower and storm chances start shortly after Midnight across northern Lake Huron, with precipitation moving south across the Saginaw Bay and central Lake Huron through the mid-morning hours. A subtle wind direction from the north will occur after the passage of the front. Activity will likely dwindle before reaching Lake St. Clair and Lake Erie as the frontal boundary stalls. A chance for showers and thunderstorms will then be possible around central Michigan, depending on where the frontal boundary stalls.

A weak area of high pressure will settle in behind the cold front which will maintain light winds through the midweek period. Passage of a warm front and area of low pressure will then move in early Thursday morning, which will bring a new chance to see showers and thunderstorms.

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

AVIATION . DG DISCUSSION . KDK MARINE . AM

You can obtain your latest National Weather Service forecasts online at www.weather.gov/detroit.


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CLSM4 - St. Clair Shores, MI 3 mi74 min WSW 5.1 G 5.1 78°F 1016.3 hPa (+1.1)
45147 - Lake St Clair 12 mi74 min SSW 5.8 G 7.8 78°F 76°F1014.8 hPa (+0.6)
AGCM4 24 mi104 min 71°F 72°F1015.4 hPa
MBRM4 - 9014090 - Mouth of the Black River, MI 45 mi104 min 77°F 1014 hPa

Wind History for Fort Gratiot, MI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Coleman A Young Municipal Airport, MI6 mi21 minW 510.00 miFair79°F60°F52%1015.5 hPa
Selfridge Air National Guard Base, MI14 mi18 minWSW 610.00 miFair75°F62°F64%1015.6 hPa
Troy, Oakland/Troy Airport, MI17 mi19 minWSW 410.00 miFair76°F62°F61%1016.6 hPa

Link to 5 minute data for KDET

Wind History from DET (wind in knots)
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Last 24hrW3NW4W4W3NW3NW4NW3NW3NW4NW6NW7W10NW7
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1 day agoW5W3W5W3W3W4W3W5W4NW45NW4W9NW8
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2 days agoS3SE5SE3S5S5S6S5S4S6SW9S7SW7S12S14
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S10W3W3W6W5

Tide / Current Tables for
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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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