Monday, January18, 2021
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Marine Weather and Tides
Oshkosh, 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 7:21AMSunset 4:47PM Monday January 18, 2021 8:44 PM CST (02:44 UTC) Moonrise 11:38AMMoonset 11:46PM Illumination 31% Phase: Waxing Crescent; Moon at 6 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:202101190530;;124952 Fzus53 Kgrb 182124 Nshgrb Nearshore Marine Forecast National Weather Service Green Bay Wi 324 Pm Cst Mon Jan 18 2021 For Waters Within Five Nautical Miles Of Shore On Lake Michigan Lmz542-543-190530- Sturgeon Bay To Two Rivers Wi-two Rivers To Sheboygan Wi- 324 Pm Cst Mon Jan 18 2021
Tonight..W wind 10 to 20 kts. Waves 2 ft or less. A chance of flurries.
Tuesday..W wind 10 to 15 kts. Waves 2 ft or less. A chance of flurries.
Tuesday night..W wind 10 to 15 kts. Waves 2 ft or less. Mostly cloudy in the evening then clearing.
Wednesday..W wind 10 to 15 kts backing sw 15 to 25 kts with a few gale force gusts up to 35 kts in the late morning and afternoon. Waves 2 ft or less building to 4 to 7 ft in the afternoon. Partly cloudy in the morning then becoming mostly cloudy. A small craft advisory may be needed.
LMZ543


7 Day Forecast for Marine Location Near Oshkosh, WI
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location: 44.02, -88.56     debug


Area Discussion for - Green Bay, WI
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FXUS63 KGRB 182351 AFDGRB

Area Forecast Discussion National Weather Service Green Bay WI 551 PM CST Mon Jan 18 2021

Updated aviation portion for 00Z TAF issuance

SHORT TERM. Tonight and Tuesday Issued at 250 PM CST Mon Jan 18 2021

Main forecast concerns remain on lake effect snow showers for far north-central WI, flurries elsewhere and weak clipper sliding by to our south and west on Tuesday.

The 19Z MSAS surface analysis showed a weak area of low pressure over south-central Lake Superior and a cold front that extended southwest from the low through central/southwest WI. Another weak low pressure was situated over north-central SD. Visible satellite imagery indicated plenty of low clouds over the region with a thinning of the clouds across northwest WI. Radar mosaic showed light lake effect snow showers/flurries over western Upper MI and north-central WI.

A broad mid-level shortwave trough will move over northern sections of Great Lakes region tonight. The combination of mid- level forcing and lake enhancement will keep a chance of snow showers/flurries across north-central WI through the night. Trajectories are not set-up the best, thus any snow accumulations would be minimal at best. The rest of the forecast area should remain dry, although a few flurries cannot be ruled out as weak individual shortwaves move through area within the northwest flow aloft. A cooler air mass to have settled over northeast WI behind the cold front. Look for min temperatures to range from 5 to 10 above zero central WI, middle to upper teens east-central WI.

The chance for lake effect snow showers will continue into Tuesday, but be in a diminishing mode as the shortwave trough exits the region. Otherwise, a pair of weak clipper systems are forecast to dive southeast from the northern Plains to the Midwest on Tuesday. The first clipper essentially dissipates over northern IL, while the second clipper to also be weakening as it reaches northeast IA by 00Z Wednesday. Modes do show measurable precipitation moving into the southern third of WI by the afternoon, however these systems appear to be just far enough to our southwest to bring snow into central or east-central WI. May add some flurries to these locations, but nothing more. Sky conditions to range from partly sunny to cloudy with max temperatures only in the middle teens north-central WI/parts of central WI, upper teens to lower 20s elsewhere.

LONG TERM. Tuesday Night Through Monday Issued at 250 PM CST Mon Jan 18 2021

Split flow pattern will continue through at least the end of the week, according to the latest medium range models. The northern stream will gradually sink to the south, which will bring colder air to Wisconsin by the end of the week. The colder air flowing over Lake Superior will produce lake effect snow showers in the snowbelt area. Amounts look to be small as wind directions are not very favorable and the air upstream is quite dry. Snow flurries are possible at times elsewhere.

A shortwave trough in the southern stream jet may bring us snow Saturday night and Sunday, but the resulting system looks less impressive than the last few days model runs with the lack of Gulf moisture and strong forcing. This is likely due to some of the jet energy remaining back in the southwest U.S. and a weaker shortwave lifting towards the northern Ohio Valley and Great Lakes. The models now have a stronger system Monday or Tuesday which stays mostly to our south.

AVIATION. for 00Z TAF Issuance Issued at 543 PM CST Mon Jan 18 2021

An upper level disturbance and associated cold front will shift east of the region this evening. Expect snow showers and flurries to diminish somewhat as this happens, with the eastern TAF sites improving from MVFR to VFR. Although brief improvement may also occur at the western TAF sites this evening, low clouds and MVFR ceilings will likely move back into the area later in the evening and persist into Tuesday morning. Another upper level disturbance will bring a chance of light snow showers or flurries during the mid to late afternoon on Tuesday.

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
GBWW3 46 mi57 min WNW 8.9 G 14
SGNW3 - Sheboygan, WI 50 mi45 min WNW 15 G 19 25°F
PWAW3 - Port Washington, WI 57 mi65 min WNW 8.9 G 13 27°F 1016.3 hPa

Wind History for Kewaunee MET, WI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Wittman Regional Airport, WI1 mi52 minWNW 710.00 miOvercast24°F15°F68%1016.2 hPa
Appleton-Outagamie, WI17 mi60 minWNW 910.00 miOvercast23°F10°F58%1013.5 hPa
Fond Du Lac County Airport, WI18 mi52 minW 610.00 miOvercast25°F15°F66%1015.8 hPa

Link to 5 minute data for KOSH

Wind History from OSH (wind in knots)
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Last 24hrNW4NW4CalmW6W4CalmW4NW6NW7NW4W3W3W5W6W5W5W4W5NW9W8
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1 day agoNW5NW7NW6NW5NW6NW5NW6NW3W3N6N6N9N8N4N6NE7NE3NW5NW4NW4N4W3CalmW3
2 days agoNW7N7N9N11N9N11N10N12N10N9N10N12N11
G18
NW11N10NW12NW10NW8NW8NW7NW5NW6NW6NW6

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

Other links: Northern Pacific     Contential US     Full GOES-East
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.