Marine Weather and Tides
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 6:34AM||Sunset 8:21PM||Thursday April 22, 2021 9:52 PM EDT (01:52 UTC)||Moonrise 1:55PM||Moonset 3:39AM||Illumination 85%|
7 Day Forecast for Marine Location Near Port Sanilac, MIHourly EDIT Help
Area Discussion for - Detroit/Pontiac, MI  (on/off)  Help NOTE: mouseover dotted underlined text for definition
FXUS63 KDTX 222330 AFDDTX
Area Forecast Discussion National Weather Service Detroit/Pontiac MI 730 PM EDT Thu Apr 22 2021
Geopotential height rises will support surface ridging across Southeast Michigan during the next 24 hours. Midlevel warming within the 4.0 and 8.0 kft agl layer will lead to SKC overnight. Diurnal heating will lead to altocumulus development at some 7.0 to 8.0 kft agl Friday.
DTW THRESHOLD PROBABILITIES.
PREV DISCUSSION. Issued at 331 PM EDT Thu Apr 22 2021
Flurries have come to an end, with dissipating clouds as surface ridge axis slides over southeast Michigan this evening. This will allow winds to go calm/very light, and with current dew pts in the upper teens-lower 20s, temperatures falling off toward freezing just after midnight appears likely. The question becomes will winds be able to stay decoupled, as we get into good low level warm advection pattern overnight. 12z NAM/regional GEM suggests southwest winds will develop/kick up around/just before 9z (which appears reasonable with the rather tight pressure gradient), as 925 mb temps of +6 to +8 C move overhead. There is also some a hint of some clouds around or just above 5000 feet which track through with the westerly push. Thus, factoring in all the considerations, will call for mins of 30- 34 degrees on average, but will not be issuing a freezing warning due to the marginal/short lived nature of the freezing temperatures (especially compared to last night with the widespread mins in the 20s).
A good amount of insolation and solid low level southwest flow in place for tomorrow should allow temperatures to reach normal values (lower 60s/around 60) before clouds begin to thicken up late in the day.
Goes R precipitable water (850-700 mb) imagery this afternoon shows moisture surging north through the Plains, with the deeper western Gulf of Moisture moisture entering Texas. Split upper level flow looks to be the rule as we head into the weekend, with the northern stream trough/upper level wave sliding through the northern Great Lakes. The southern low/wave looks to be the main show, but should not make a whole lot more progress north than Tennessee or Kentucky, as convection fires up within the deep moisture over the Gulf Coast States. None-the-less, adequate moisture (PW values 0.75- 1.0) reaching into southern Lower Michigan to support showers on Saturday. Still, being caught into between the two systems, and looking at the 50 member ensembles of the EURO as well as 12z Canadian, far from a slam dunk we will see rain. Whatever rain falls should be fairly light, as we remain stable/positive LI's.
Another healthy shot of cold air will arrive on Sunday behind the northern stream wave, with 850 mb temps advertised to drop into the negative low-mid single numbers. Well mixed boundary layer Sunday, likely supporting northwest wind gusts around 30 MPH. Today we reached around 35 mph, but that was helped out by the flurry activity/inverted V soundings.
Monday morning min temperatures look to bottom near the freezing mark once again as ridge axis extending from Ontario/Quebec high slides through.
A significant warmup is then progged for early next week as upper level ridge builds east of the Mississippi River. The Great Lakes region will reside on the outer edge of the Ridge and within the instability/moisture axis, which will support a chance of showers and thunderstorms, with upper level energy over Four Corners region eventually kicking out a low, which will probably arrive in the mid week period (Wednesday-Thursday), supporting a high chance of showers and thunderstorms.
Expansive area of high pressure over the center of the nation will slide to east coast by Saturday morning. This will keep a predominately southwesterly flow through Friday night. A broad area of weak low pressure will move through the Great Lakes Saturday bringing showers and a more southerly wind. Winds veer back northwesterly Saturday night and increasing as the system moves to the east.
DTX WATCHES/WARNINGS/ADVISORIES. MI . NONE. Lake Huron . NONE. Lake St Clair . NONE. Michigan waters of Lake Erie . NONE.
AVIATION . CB DISCUSSION . SF MARINE . DRC
You can obtain your latest National Weather Service forecasts online at www.weather.gov/detroit.
Weather Reporting StationsEDIT (on/off)  Help NOTE: Click on distance to see the station location on a map
|Stations||Dist||Age||Wind||Air Temp||Water Temp||Waves||Pressure||DewPt|
|45149 - Southern Lake Huron||4 mi||52 min||S 7.8 G 7.8||38°F||37°F||2 ft||1016 hPa (-0.1)|
|PSCM4||22 mi||52 min||S 8.9 G 9.9||38°F||1033.9 hPa|
|HRBM4 - 9075014 - Harbor Beach, MI||33 mi||52 min||S 4.1 G 4.1||41°F||45°F||1014.2 hPa (+0.0)||30°F|
|MBRM4 - 9014090 - Mouth of the Black River, MI||41 mi||52 min||41°F||1014.9 hPa (-0.0)|
|KP58||47 mi||57 min||SW 2.9||40°F||1015.1 hPa||23°F|
Wind History for Harbor Beach, MI(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports. Follow links for more data.
|St Clair County International Airport, MI||47 mi||58 min||N 0||10.00 mi||Fair||34°F||25°F||70%||1016.3 hPa|
Link to 5 minute data for KPHN
Wind History from PHN (wind in knots)
|1 day ago||S||Calm||NW||N||N||Calm||Calm||NW||NW||NW||N||NW||NW|
|2 days ago||W||W|
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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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