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Marine Weather and Tides
Version 3.4 |
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it. 8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue. 12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed. 10/9/2019 Updated the Marine Zones. 9/4/2019 Fixed the weather maps due to NOAA moving them. 7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports. |
Sunrise 7:50AM | Sunset 5:32PM | Saturday January 23, 2021 1:15 PM EST (18:15 UTC) | Moonrise 1:13PM | Moonset 3:25AM | Illumination 79% | ![]() |
LCZ422 /o.exp.kdtx.ma.w.0053.000000t0000z-201023t2100z/ 453 Pm Edt Fri Oct 23 2020
.the special marine warning will expire at 500 pm edt... The affected areas were... NEarshore and open waters from port sanilac to port huron mi... St. Clair river... The Thunderstorms over the southern lake huron have moved into the canadian waters and no longer pose a significant threat to boaters. Strong Thunderstorms crossing the st. Clair river will exit east a little after 5 pm, Thus the special marine waters will be allowed to expire. Lat...lon 4300 8242 4296 8242 4292 8246 4282 8248 4276 8247 4262 8252 4263 8257 4276 8251 4284 8251 4301 8246 4311 8250 4313 8248 4323 8251 4343 8253 4343 8220 time...mot...loc 2051z 225deg 47kt 4385 8192 4360 8219 4340 8237
.the special marine warning will expire at 500 pm edt... The affected areas were... NEarshore and open waters from port sanilac to port huron mi... St. Clair river... The Thunderstorms over the southern lake huron have moved into the canadian waters and no longer pose a significant threat to boaters. Strong Thunderstorms crossing the st. Clair river will exit east a little after 5 pm, Thus the special marine waters will be allowed to expire. Lat...lon 4300 8242 4296 8242 4292 8246 4282 8248 4276 8247 4262 8252 4263 8257 4276 8251 4284 8251 4301 8246 4311 8250 4313 8248 4323 8251 4343 8253 4343 8220 time...mot...loc 2051z 225deg 47kt 4385 8192 4360 8219 4340 8237
LCZ422 Expires:202010232101;;729012
FZUS73 KDTX 232053
MWSDTX
Marine Weather Statement
National Weather Service Detroit/Pontiac MI
453 PM EDT Fri Oct 23 2020
LCZ422-LHZ443-464-232101-
7 Day Forecast for Marine Location Near St. Clair, MI
Hourly EDIT Help
location: 42.82, -82.47 debug
Area Discussion for - Detroit/Pontiac, MI
  (on/off)  Help NOTE: mouseover dotted underlined text for definitionFXUS63 KDTX 231744 AFDDTX
Area Forecast Discussion National Weather Service Detroit/Pontiac MI 1244 PM EST Sat Jan 23 2021
AVIATION.
High pressure continues to move across the northern Ohio Valley early this afternoon, with northern extent reaching into the airspace and allowing for mainly clear skies with the exception of lingering stratocu at KMBS and KFNT, which has occasionally dipped MVFR at times. Sky attempts to stay mainly clear into the early evening hours before mid/high clouds fill in from the southwest ahead of approaching upper wave that will bring a round of periodic light snow late in the TAF period Sunday after 12z. West/northwest winds 5-10 knots will trend variable overnight for a time before reorienting out of the southeast Sunday.
For DTW . Light snow looks to hold off until after 12z Sunday as southern wing of moisture ascent will take some time to overcome near-surface dry air. Potential will exist for some intervals of MVFR snow towards the end of the period, but confidence not there to include mention at this time.
DTW THRESHOLD PROBABILITIES .
* Low in ceilings below 5000 feet after 12z Sunday.
* High in ptype as snow after 12z Sunday
PREV DISCUSSION. Issued at 358 AM EST Sat Jan 23 2021
DISCUSSION .
Overnight stratus has held on nicely through the early parts of the morning, with rapid erosion of cloud cover now noted via infrared across the Grand Rapids region as mid-level subsidence ahead of surface high pressure currently located over the Midwest. Expecting the continued erosion of stratus to take place (south of the thumb) as high pressure continues to work east into the Ohio Valley by this afternoon. After a very cold start to the morning marked by overnight lows in the teens and wind chills in the single digits, a modest warm up into the mid to upper 20s is expected later today along with some sunshine. As the high pressure tracks east through the evening, low-level flow will back from northwest to southwest. This will usher in low and mid level clouds across the state and will keep overnight lows slightly warmer, holding in the upper teens to lower 20s.
The next chance for light accumulating snowfall will then expand across Michigan throughout Sunday morning (after 6 AM EST) as weak system relative isentropic ascent takes place behind the departing high pressure system. Saturation will initially occur in the mid- levels on the 296-203K surfaces and will have to overcome some initial low level dry air. As the column saturates, expecting light snow to fill on across the state, with slightly better forcing noted across Flint up into the Tri Cities, where likely PoPs hold. Expecting around an inch of accumulation through the early afternoon in and around the Tri Cities, with totals holding under an inch elsewhere (half inch or under for northern Metro region south). Area of best isentropic ascent will then slide into the Thumb during the later part of the afternoon, with snow chances diminishing by the late evening.
Water vapor imagery shows one of the main features of interest for this forecast package, a pv feature just off the coast of California, set to pivot south across Baja California late in the day before ejecting east into TX/OK by early Monday morning. This will result in the development of a low pressure system interacting with a baroclinic zone, set to track north into the Ohio Valley between 00Z Tue - 12Z Tue. Plentiful moisture will eject north across the Ohio Valley and into the Great Lakes ahead of the low pressure system and will bring the likely chance to see accumulating snowfall for portions of SE MI starting late Monday evening into Tuesday morning. Predictability of where the heaviest axis of snowfall (potential for 4+ inches) will fall remains low given it will remain sensitive to both the track of the low and trowal/deformation dynamics. WPC cluster phase space analysis shows the most likely location the axis will fall will be somewhere across southern lower Michigan or south into the northern Ohio Valley. As a result, preliminary forecasted snowfall totals of 3-5 inches will hold over the Metro region down to the Ohio border, with gradually decreasing totals north of this heavier forecasted area. Additional adjustments will be needed as the PV feature comes onshore and is better sampled by the NWS upper-air stations in the coming days.
Last, snow chances are expected to taper off later in the day on Tuesday with high pressure filling in from north to south through the midweek period. This will minimize precipitation chances to end the week while temperature trends remain seasonable.
MARINE .
Northwest winds still gusting up around 25 knots over Lake Huron will gradually diminish today, along with the snow showers. Still, the larger waves over the southern Lake Huron will lag with the unstable near surface profiles. Small craft advisories continue through 11 am for the northern/eastern tip of the Thumb region.
Light and variable winds set up this evening as a ridge of high pressure slides through tonight.
Light southerly flow expected on Sunday as weak low pressure tracks through the northern Great Lakes through Sunday night. A period of light warm advection snow likely in this time frame, but visibility's probably remaining at or above 2 miles.
A much stronger low will lift into the Ohio Valley late Monday, and will lead to increasing east-northeast/onshore flow (up around 25 knots), and small craft advisories may be needed by Monday evening and continued into Tuesday. Snow will likely overspread Lake Erie and Lake St. Clair, and possibly as far north as southern third of lake Huron.
DTX WATCHES/WARNINGS/ADVISORIES. MI . NONE. Lake Huron . NONE. Lake St Clair . NONE. Michigan waters of Lake Erie . NONE.
AVIATION . IRL DISCUSSION . AM MARINE . SC
You can obtain your latest National Weather Service forecasts online at www.weather.gov/detroit.
Weather Reporting Stations
EDIT (on/off)  Help NOTE: Click on distance to see the station location on a mapStations | Dist | Age | Wind | Air Temp | Water Temp | Waves | Pressure | DewPt |
MBRM4 - 9014090 - Mouth of the Black River, MI | 11 mi | 46 min | 25°F | 1026.4 hPa | ||||
AGCM4 | 14 mi | 46 min | 24°F | 36°F | 1027.5 hPa | |||
CLSM4 - St. Clair Shores, MI | 32 mi | 76 min | WNW 5.1 G 11 | 22°F | 1029.1 hPa (+1.0) | |||
PSCM4 | 42 mi | 76 min | WNW 8 G 13 | 21°F | 1045.7 hPa (+1.3) |
Wind History for Fort Gratiot, MI
(wind in knots) EDIT (on/off)  Help1 PM | 2 PM | 3 PM | 4 PM | 5 PM | 6 PM | 7 PM | 8 PM | 9 PM | 10 PM | 11 PM | 12 AM | 1 AM | 2 AM | 3 AM | 4 AM | 5 AM | 6 AM | 7 AM | 8 AM | 9 AM | 10 AM | 11 AM | 12 PM | |
Last 24hr | NW G28 | NW G18 | NW G18 | NW G16 | NW G14 | NW G16 | NW G13 | NW G17 | NW G15 | NW G16 | NW G14 | NW G20 | NW G16 | NW G17 | NW G14 | NW G16 | NW G13 | NW G18 | NW G17 | NW G13 | NW G13 | NW G13 | NW G11 | NW G12 |
1 day ago | W G18 | W G14 | W G13 | W G10 | W G8 | W G29 | W G19 | W G20 | NW G26 | W G14 | W G14 | W G14 | W G11 | W G12 | W G12 | NW G19 | NW G17 | NW G17 | NW G16 | NW G17 | NW G13 | NW G21 | NW G21 | NW G19 |
2 days ago | W G12 | SW G14 | SW G15 | SW G15 | SW G18 | SW G18 | SW G18 | SW G21 | SW G25 | SW G22 | SW G22 | SW G19 | SW G23 | SW G22 | SW G18 | SW G18 | SW G22 | SW G15 | SW G14 | SW | SW G14 | SW G14 | SW G13 | W G15 |
Airport Reports
EDIT (on/off)  Help Click EDIT to display multiple airports. Follow links for more data.Airport | Dist | Age | Wind kt | Visibility | Sky/Weather | Temp | DewPt | Humidity | Pressure |
St Clair County International Airport, MI | 8 mi | 21 min | WSW 5 | 10.00 mi | Overcast | 23°F | 10°F | 58% | 1027.8 hPa |
Link to 5 minute data for KPHN
Wind History from PHN (wind in knots)
2 PM | 3 PM | 4 PM | 5 PM | 6 PM | 7 PM | 8 PM | 9 PM | 10 PM | 11 PM | 12 AM | 1 AM | 2 AM | 3 AM | 4 AM | 5 AM | 6 AM | 7 AM | 8 AM | 9 AM | 10 AM | 11 AM | 12 PM | 1 PM | |
Last 24hr | NW G17 | W G16 | W | W G17 | W | W G15 | W | NW G14 | W G17 | W | NW G15 | W | W G16 | NW G16 | W | W | NW | W | NW | W | W | NW | W | NW |
1 day ago | SW | SW | SW | SW | SW | W G20 | W G20 | W G15 | W | W G16 | W | W | W | W | W | W | NW | NW | NW | NW G15 | NW G17 | NW G15 | W G15 | NW |
2 days ago | SW G14 | SW | S G15 | S | S G16 | S G17 | S | S G20 | S G18 | S G17 | S G27 | S G19 | S G16 | S G19 | S G14 | SW | SW | SW | SW | S | S | S | SW | S |
Tide / Current Tables for
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GEOS Local Image of EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
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