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Marine Weather and Tides
Version 3.4 |
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. 6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen |
Sunrise 7:52AM | Sunset 4:57PM | Sunday December 15, 2019 6:51 PM EST (23:51 UTC) | Moonrise 8:36PM | Moonset 11:01AM | Illumination 82% | ![]() |
LHZ441 Port Austin To Harbor Beach Mi- 349 Pm Est Sun Dec 15 2019
Tonight..West winds 10 to 15 knots. Mostly cloudy in the evening becoming partly cloudy. Scattered flurries in the evening. Waves 1 to 3 feet.
Monday..West winds 10 to 15 knots. Partly cloudy. Waves 1 to 3 feet.
Monday night..Northwest winds 5 to 10 knots. Partly cloudy in the evening becoming mostly cloudy. Waves 2 feet or less.
Tuesday..Northwest winds 10 to 15 knots. Mostly cloudy in the morning becoming partly cloudy. Waves 1 to 3 feet. SEe lake huron open lake forecast for days 3 through 5.
Tonight..West winds 10 to 15 knots. Mostly cloudy in the evening becoming partly cloudy. Scattered flurries in the evening. Waves 1 to 3 feet.
Monday..West winds 10 to 15 knots. Partly cloudy. Waves 1 to 3 feet.
Monday night..Northwest winds 5 to 10 knots. Partly cloudy in the evening becoming mostly cloudy. Waves 2 feet or less.
Tuesday..Northwest winds 10 to 15 knots. Mostly cloudy in the morning becoming partly cloudy. Waves 1 to 3 feet. SEe lake huron open lake forecast for days 3 through 5.
LHZ441 Expires:201912160430;;838339
FZUS53 KDTX 152049
NSHDTX
Nearshore Marine Forecast for Michigan
National Weather Service Detroit/Pontiac MI
349 PM EST Sun Dec 15 2019
For waters within five nautical miles of shore
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.
LHZ441-160430-
7 Day Forecast for Marine Location Near Harbor Beach, MI
Hourly EDIT Helplocation: 43.84, -82.65 debug
Area Discussion for - Detroit/Pontiac, MI
  (on/off)  Help NOTE: mouseover dotted underlined text for definitionFXUS63 KDTX 152031 AFDDTX
Area Forecast Discussion National Weather Service Detroit/Pontiac MI 331 PM EST Sun Dec 15 2019
DISCUSSION.
Healthy diurnal cloud and flurry response ongoing within the lake- enhanced moisture and instability plume across the central Lakes region this afternoon. With sunset, the lake clouds will slowly thin and dissipate this evening, while high and mid-level clouds spill overhead.
The first of two confluent waves - currently over the mid- Mississippi Valley - will slide to the south of the region tonight. This wave is responsible for the incoming upper-level cloud cover. The tropopause-level jet axis remains positioned to the south of the state - preventing the ribbon of low-level ascent from making a northward push overnight. Expect the light snow shield to remain well south - but some flurry activity may make it through the rather impressive dry layer centered on 3kft to the surface toward daybreak across the very far south.
The second more substantial wave - currently over the southwest CONUS - will quickly eject out over the southern Plains on Monday and follow within the confluent flow over the Ohio Valley. An axis of deformation in the 600-500mb layer will sweep across the southern half of the forecast area. However, the jet core remains south of the area with this wave as well - precluding much in the way of a northward advancement of the snow shield. A couple hours of light snow are possible near the border - otherwise, just a shield of mid- clouds with plenty of virga within the restricted region of mid- level forcing.
Attention turns to the northern stream with a sharpening upper wave sweeping southeast across Ontario late Tuesday and Wednesday. Trends have been slightly more amplified. Given a more amplified look of the incipient wave on GOES WV imagery - expect the wave to come in a bit stronger and slower in the next cycle or two as better remote sampling occurs. The associated low-level airmass is respectably cold - 850mb temps below -20C across the region. There should be a rather nice lake-effect response on Superior and Huron starting Tuesday night and continuing Wednesday. Lake Michigan will also get into the act to a lesser extent. The timing of the influx of cold air being overnight complicates the inland impacts as the convective response will be somewhat muted. That said, there is some signal in the model soundings to keep an eye on a ribbon of snow showers on the arctic front Tuesday night, if the front is able to kick-up enough boundary layer moisture. Highs on Wednesday will be locked in the low-mid 20s with wind chills in the single digits . Thursday looks only slightly warmer.
Most of the guidance suite, save the GFS, indicates longwave ridging quickly follows for the end of the week into next week. Temperatures will moderate and chances for precipitation will be rather meager.
MARINE.
Small Craft Advisory conditions have come to an end as winds decrease and elevated wave action pushes away from the nearshore zones. There will be a slight backing of the winds to the southwest into this evening and tomorrow as a high pressure slides into the western Great Lakes with short wave ridging. Winds will remain light into tomorrow while a system organizes across the TN/OH River Valleys tonight into Tuesday. Little impact to the Great Lakes other than chances for light snow showers across the southern lakes. Greater surge of arctic air with a polar low will arrive Tuesday night/Wednesday morning bringing possible northwest gales across Lake Huron. The cold air in combination with elevated winds will also bring potential for heavy freezing spray across Lake Huron as well. Increasing waves will also bring an additional round of Small Craft Advisories to the nearshore zones. Arctic surge does not stick around for long as high pressure with decreasing winds follows on Wednesday night.
PREV DISCUSSION. Issued at 1227 PM EST Sun Dec 15 2019
AVIATION .
Westerly flow off of Lake Michigan will continue to produce a healthy BKN cloud deck across all terminal sites through the afternoon, with mainly VFR cigs, although periods of MVFR cannot be ruled out across the Metro terminals north into KPTK as the last of the moisture responsible for this mornings snow showers move out of the area. Expecting all terminals to achieve VFR by the late afternoon as dry air builds in the low-levels and cloud depths rise from daytime heating. Loss of daytime heating and intrusion of low- low to mid-level dry air will aid in the loss of cloud cover late this evening and overnight, before a mid-level cloud deck moves overhead, from a storm system located across the Tennessee Valley. Expecting precipitation from the system to stay south of the terminals, mainly around the MI/OH border south.
For DTW . Light snow showers remain likely over the next couple of hours, through 19Z, before incoming dry air in the low-levels cuts off snow chances. Otherwise, expecting BKN cloud deck between 4-6 kft to hold during daylight hours before eroding tonight. A secondary chance of ceilings returning aob 5kft during the mid- morning hours, but confidence remains low at this time as some guidance suggests ceilings will hold above 5kft, tied to incoming moisture from southern storm system. Model trends continue to hold overnight snow chances south of the terminal.
DTW THRESHOLD PROBABILITIES .
* High for cigs below 5000 ft this afternoon, low this evening. Low/moderate again for Monday morning.
DTX WATCHES/WARNINGS/ADVISORIES. MI . NONE. Lake Huron . NONE. Lake St Clair . NONE. Michigan waters of Lake Erie . NONE.
DISCUSSION . Mann MARINE . AA AVIATION . AM
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 |
HRBM4 - 9075014 - Harbor Beach, MI | 1 mi | 52 min | SSW 1.9 G 2.9 | 25°F | 33°F | 1019.4 hPa (+1.3) | 19°F | |
KP58 | 15 mi | 61 min | SW 2.9 | 27°F | 1019.8 hPa | 17°F | ||
PSCM4 | 30 mi | 52 min | SW 1.9 G 2.9 | 27°F | 1037.6 hPa (+1.7) | |||
GSLM4 - Gravelly Shoals Light MI | 49 mi | 72 min | WSW 8.9 G 13 | 27°F | ||||
TAWM4 - Tawas City, MI | 51 mi | 72 min | NW 4.1 G 6 | 26°F | 1018.6 hPa |
Wind History for Harbor Beach, MI
(wind in knots) EDIT (on/off)  Help7 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 | 2 PM | 3 PM | 4 PM | 5 PM | 6 PM | |
Last 24hr | W G10 | W G12 | W G13 | W G10 | W | W G14 | W G12 | W G17 | W G18 | W G15 | NW G19 | NW G14 | NW G11 | NW G18 | NW G14 | NW G15 | NW G18 | NW G16 | W G15 | NW G13 | W | NW G10 | N | S |
1 day ago | S | S | S G11 | S | S | SE | SW | -- | SE | -- | NW | NW | NW | NW G8 | NW G8 | NW | N | N | NW G14 | NW G15 | NW G15 | NW | NW G13 | W G12 |
2 days ago | S G28 | S G24 | S G19 | S G17 | S G19 | S G18 | S G19 | S G17 | SW G14 | S G13 | SW G12 | S G12 | S | S | S | S G11 | S G12 | S | S | SE | S G9 | S | S 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 |
Port Hope, MI | 15 mi | 61 min | SW 3 | mi | 27°F | 17°F | 66% | 1019.8 hPa | |
Huron County Memorial Airport, MI | 18 mi | 56 min | N 0 | 10.00 mi | Fair | 24°F | 17°F | 75% | 1019 hPa |
Link to 5 minute data for KP58
Wind History from P58 (wind in knots)
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 | 2 PM | 3 PM | 4 PM | 5 PM | 6 PM | |
Last 24hr | NW | NW | W | NW | W | W | W G18 | W G19 | W G21 | W G18 | W G23 | NW G26 | NW G27 | NW G26 | NW G24 | NW G22 | NW G19 | NW G18 | NW | W | W | SW | ||
1 day ago | SE | S | Calm | S | Calm | SW | Calm | SE | Calm | Calm | Calm | W | W | NW | N | N | N | NW | NW | NW | W | |||
2 days ago | S G23 | S G22 | G21 | S G17 | G14 | S | S G16 | SW | SW | SW | S | S | S | S | SE | S | SE | S |
Tide / Current Tables for
EDIT Weekend mode (on/off) (on/off)  HelpTide / Current Tables for
EDIT (on/off)  HelpWeather Map
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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.
Link to Loop

Other links: Northern Pacific Contential US Full GOES-East
Wind Forecast for Detroit/Pontiac, MI (18,4,5,8)
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Ground Weather Radar Station Detroit, MI
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