Wednesday, April21, 2021
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Marine Weather and Tides
New Baltimore, MI

Version 3.4
NOTICE
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 6:38AMSunset 8:21PM Wednesday April 21, 2021 7:00 AM EDT (11:00 UTC) Moonrise 12:48PMMoonset 3:05AM Illumination 70% Phase: Waxing Gibbous; Moon at 9 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- 408 Am Edt Wed Apr 21 2021
Today..Northwest winds 10 to 15 knots. Partly Sunny. A chance of snow in the morning. Waves 2 feet or less.
Tonight..Northwest winds 10 to 15 knots diminishing to 5 to 10 knots in the late evening and early morning...then increasing to 10 to 15 knots early in the morning. Partly cloudy. Waves 2 feet or less.
Thursday..West winds 10 to 15 knots. Mostly Sunny. Waves 2 feet or less.
Thursday night..West winds 15 to 20 knots diminishing to 10 to 15 knots in the late evening and overnight. Clear. Waves 2 feet or less.
Friday..Southwest winds 10 to 15 knots. Mostly Sunny in the morning becoming partly cloudy. Waves 2 feet or less.
Saturday..East winds 5 to 10 knots. Mostly cloudy with a chance of rain. Waves 2 feet or less.
Sunday..North winds 10 to 15 knots. Partly cloudy. Waves 2 feet or less.
LCZ460 Expires:202104212015;;883468 FZUS63 KDTX 210808 GLFSC Lake St Clair Forecast National Weather Service Detroit/Pontiac MI 408 AM EDT Wed Apr 21 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...Low pressure, 29.80 inches, will continue to push off to the east with northerly flow taking over today. Gusty northwest winds tonight over Lake Huron to around 25 knots across central and northern Lake Huron. High pressure, 30.20 inches, will move into the Ohio Valley Thursday and Friday helping keep marine conditions relatively quiet. Gusty northwest winds return Saturday night and Sunday as another shot of cold air moves over the lakes. LCZ460-212015-


7 Day Forecast for Marine Location Near New Baltimore, MI
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location: 42.6, -82.71     debug


Area Discussion for - Detroit/Pontiac, MI
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FXUS63 KDTX 211030 AFDDTX

Area Forecast Discussion National Weather Service Detroit/Pontiac MI 630 AM EDT Wed Apr 21 2021

AVIATION.

MVFR to lower VFR ceilings should fill back in today with a gradual lifting as better mixing ensues this morning. NNW winds will back to NW and increase into the 10-15 knot range with some gusts to 20 knots. Clearing skies and lighter W flow will set up this evening as a ridge of surface high pressure builds into the area.

DTW THRESHOLD PROBABILITIES.

* High for ceiling at or below 5000 ft this morning, moderate this afternoon.

PREV DISCUSSION. Issued at 358 AM EDT Wed Apr 21 2021

DISCUSSION .

The back edge of precipitation associated with the system relative isentropic ascent has pushed east of Michigan early this morning with some lingering snow showers along the Detroit River corridor at press time. These showers will push east within the next hour or two. The main concern in regards to hazardous travel this morning will be for slick spots to develop. Many roadways are now wet, though ground temperatures overall remain well above freezing. Observations show surface air temperatures that have dipped to freezing for much of southeast Michigan. Dewpoints are now in the teens across the Tri-Cities and a northwest wind will usher these dewpoints further south through the morning. Dewpoints in the teens in combination with the winds may be just strong enough at times to lead to wet bulb cooling effects that may cause a few localized icy spots to develop. This would mainly be on bridges, overpasses, and any other elevated roadways.

A secondary push of colder air into Michigan with the favorable wind direction will also support light lake effect snow showers working southward this morning off of Lake Huron. A surface trough moving over the Lake Huron will shift winds from the N-NNE, which will direct these showers inland. The eastern portions of the Thumb down to Port Huron will be the more likely areas to experience this activity today, but some scattered light rain/snow showers may reach as far west along the I-69 corridor to Flint or Lapeer during the afternoon. The secondary cold front passing this morning will send 850 mb temperatures down into the -8 to -11 C range by this afternoon. Expecting well below normal high temperatures today in the low to mid 40s for much of the inland areas. Slightly cooler temperatures in the upper 30s for the Thumb region. Gusty afternoon winds to around 20 mph will result in wind chills in the 30s. Fewer clouds tonight allow for better cooling conditions which will result in another night of well below freezing temperatures. Many locations will experience lows in the mid 20s, while the urban heat holds in the upper 20s to 30 degrees. Thus, the Freeze Warning currently in effect will remain in place through tonight.

The mid/upper level trough axis will pass to the east by tonight while a surface high pressure builds across the mid and lower Mississippi River Valley Thursday morning. In addition, shortwave ridging will build in over the western Great Lakes. All of this will begin to push the coldest air out of Michigan for the late week period. Late April sun angle and fewer clouds for Thursday will help daytime high temperatures recover back into the 50s for much of southeast Michigan. A vort max dropping out of Hudson Bay on the backside of the trough will bring increased low level flow between 20-30 knots. Diurnal mixing depths on Thursday increase to around 2 km which will result in gusty west winds peaking in the afternoon on Thursday. Gusts up to 30 mph will be possible.

The aforementioned surface high pressure will move through the Ohio Valley during the late week period keeping conditions dry for Thursday and Friday. Deep layer west-southwest flow will help temperatures rebound further for Friday. Forecast high temperatures for Friday are in the 60s. Chances for rain increase Friday night and Saturday as northern stream and southern stream jets interact which generates a surface low that moves through the Ohio Valley and sends increased moisture/theta-e into southeast Michigan. Temperatures slightly below normal (mainly in the 50s) for the weekend due to the rain chances for Saturday and then some cooler air in the wake of that system for Sunday. Amplified upper ridging during the early week will bring much warmer temperatures early next week.

MARINE .

The low pressure system that is bringing snow across southern Lake Huron will push off to the east by Wednesday morning. North/northwest winds will switch to a more northerly direction and will persist through the day on Wednesday. A Small Craft Advisory has been issued from late tonight into Wednesday as this northerly fetch leads to a period of building waves over the southern basin of Lake Huron with gusts to around 20 knots. Cold northwest winds tonight will gust to around 25 knots over central and northern lake Huron. High pressure builds across the Ohio Valley tonight through Friday leading to lighter winds.

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

Lake Huron . Small Craft Advisory until 4 PM EDT this afternoon for LHZ421- 441>443.

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

AVIATION . DG DISCUSSION . AA MARINE . AA

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
AGCM4 10 mi43 min 29°F 44°F1015.1 hPa
CLSM4 - St. Clair Shores, MI 13 mi61 min NW 5.1 G 8 32°F 1016.3 hPa (+0.4)
MBRM4 - 9014090 - Mouth of the Black River, MI 30 mi43 min 31°F 1014.2 hPa

Wind History for Fort Gratiot, MI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Selfridge Air National Guard Base, MI7 mi65 minNW 410.00 miOvercast31°F31°F100%1016 hPa
Coleman A Young Municipal Airport, MI20 mi68 minN 610.00 miOvercast33°F27°F78%1016.4 hPa
St Clair County International Airport, MI24 mi66 minN 010.00 miOvercast28°F23°F80%1015.6 hPa

Link to 5 minute data for KMTC

Wind History from MTC (wind in knots)
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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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