Sunday, January17, 2021
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Marine Weather and Tides
Manitowoc, WI

Version 3.4
NOTICE
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 7:19AMSunset 4:42PM Sunday January 17, 2021 12:55 AM CST (06:55 UTC) Moonrise 11:13AMMoonset 10:39PM Illumination 15% Phase: Waxing Crescent; Moon at 4 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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LMZ543 Expires:202101171115;;036398 Fzus53 Kgrb 170339 Nshgrb Nearshore Marine Forecast National Weather Service Green Bay Wi 939 Pm Cst Sat Jan 16 2021 For Waters Within Five Nautical Miles Of Shore On Lake Michigan Lmz521-522-541>543-171115- Green Bay South Of Line From Cedar River To Rock Island Passage And North Of A Line From Oconto Wi To Little Sturgeon Bay Wi- Green Bay South Of Line From Oconto Wi To Little Sturgeon Bay Wi- Rock Island Passage To Sturgeon Bay Wi- Sturgeon Bay To Two Rivers Wi-two Rivers To Sheboygan Wi- 939 Pm Cst Sat Jan 16 2021
Rest of tonight..NW wind 10 to 20 kts. Waves 1 to 3 ft. Isolated snow showers mainly near door county.
Sunday..N wind 10 to 15 kts. Waves 1 to 3 ft. A chance of flurries.
Sunday night..NW wind 10 to 15 kts. Waves 1 to 3 ft. Mostly cloudy.
Monday..W wind 5 to 10 kts. Waves 2 ft or less. Mostly cloudy.
LMZ543


7 Day Forecast for Marine Location Near Manitowoc, WI
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location: 44.09, -87.65     debug


Area Discussion for - Green Bay, WI
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FXUS63 KGRB 170420 AFDGRB

Area Forecast Discussion National Weather Service Green Bay WI 1020 PM CST Sat Jan 16 2021

Updated aviation portion for 06Z TAF issuance

SHORT TERM. Tonight and Sunday Issued at 239 PM CST Sat Jan 16 2021

Main forecast concern to be on light lake effect snow showers across north-central WI.

The 19Z MSAS surface analysis indicated an area of low pressure well to our east over extreme southeast Ontario. A weak trough extended westward from the low pressure through Upper MI to the northeast corner of MN. The radar mosaic showed one band of mainly lake effect running along the western shores of Lake MI with a mix of light rain and snow. Surface obs showed scattered lake effect snow showers moving into north-central WI from Lake Superior. Temperatures remained well above normal by mid-January standards.

Cyclonic flow and the west to east orientated surface trough to remain across the region tonight, thus at least some flurries will be possible from time to time. Lake effect snow showers/flurries from Superior to continue over north-central WI, although any accumulations would be very minor (one-half inch or less) due to the air mass aloft just not very cold (8H temperatures around -10C over western Lake Superior). Models continue to show a shortwave trough will dive from the northern Plains toward the mid-MS Valley by daybreak. This track would keep any light snow accumulations to our west, thus do not anticipate any snow from this feature. Otherwise, look for cloudy skies with min temperatures in the upper teens to around 20 degrees north-central WI, middle to upper 20s east-central WI.

Persistent northwest winds will keep the chance for lake effect snow showers over north-central WI through Sunday. The air mass aloft remains only modestly cold with 8H temperatures holding at around -10C, thus little additional accumulation is anticipated. The rest of northeast WI to remain stuck in the clouds as time sections show plenty of low-level moisture remaining in place over the area. Cannot rule out some stray flurries at times, but for the most part Sunday should be mainly dry. Max temperatures to be in the middle to upper 20s north-central, lower 30s east-central WI.

LONG TERM. Sunday Night Through Saturday Issued at 239 PM CST Sat Jan 16 2021

A split flow pattern is forecast to continue through most of next week, with the most energy and moisture to stay to our south, and a few short wave troughs with little moisture passing to our north. Northwest upper flow and falling heights should result in temperatures close to normal through midweek, and then a bit colder than normal by the end of the week.

Lake effect snow showers are likely at times in far northcentral Wisconsin but moisture and instability look insufficient for any significant accumulation. The ECMWF and GFS do have a significant upper trough in the southern stream lifting north towards the Northern Ohio Valley. It could bring several inches of snow if it occurs.

AVIATION. for 06Z TAF Issuance Issued at 1019 PM CST Sat Jan 16 2021

Cyclonic northwest flow and lingering low-level moisture will lead to widespread MVFR ceilings and scattered snow showers and flurries through the TAF period. Lake-effect snow showers will be found in far north central WI, but should generally remain north of the RHI TAF site.

GRB WATCHES/WARNINGS/ADVISORIES. NONE.

SHORT TERM . Kallas LONG TERM . RDM AVIATION . Kieckbusch


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SGNW3 - Sheboygan, WI 24 mi56 min NW 6 G 7 32°F
KWNW3 - 9087069- Kewaunee, WI 27 mi56 min NW 4.1 G 6 31°F 1003.9 hPa (+0.0)
GBWW3 36 mi56 min NW 5.1 G 6 1003.6 hPa (-0.4)

Wind History for Kewaunee MET, WI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Manitowoc, Manitowoc County Airport, WI4 mi60 minNNW 710.00 miOvercast31°F27°F85%1005.1 hPa
Sheboygan County Memorial Airport, WI24 mi63 minNW 310.00 miOvercast32°F27°F82%1004.8 hPa

Link to 5 minute data for KMTW

Wind History from MTW (wind in knots)
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Last 24hrN9N7N9N9N12N11N10N12
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1 day ago--SE15
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SE9SE8S7CalmSE4N3N4NE54N3N3CalmNW3CalmNW3W3NW4NW4NW5NW7N6N7
2 days agoNW3CalmCalmN5CalmCalmCalmCalmE3SE10SE10SE11SE12SE10SE10SE6SE4E4SE8E14SE14E15SE19
G26
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G23

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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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

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Ground Weather Radar Station




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The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerous of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.