Thursday, April2, 2020
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Marine Weather and Tides
Marinette, WI

Version 3.4
NOTICE
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 6:28AMSunset 7:22PM Thursday April 2, 2020 12:58 PM CDT (17:58 UTC) Moonrise 12:35PMMoonset 3:33AM Illumination 72% Phase: Waxing Gibbous; Moon at 10 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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LMZ521 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- 1008 Am Cdt Thu Apr 2 2020
Rest of today..Variable wind under 10 kts becoming se 5 to 10 kts in the afternoon. Waves 2 ft or less. Mostly Sunny through early afternoon then increasing clouds.
Tonight..E wind 5 to 10 kts. Waves 2 ft or less. Becoming mostly cloudy.
Friday..SE wind 5 to 10 kts. Waves 2 ft or less. Partly Sunny.
Friday night..SE wind 5 to 10 kts backing nw after midnight. Waves 2 ft or less. A chance of light rain in the evening, then light rain likely after midnight.
LMZ521 Expires:202004022230;;460168 FZUS53 KGRB 021508 NSHGRB Nearshore Marine Forecast National Weather Service Green Bay WI 1008 AM CDT Thu Apr 2 2020 For waters within five nautical miles of shore on Lake Michigan LMZ521-522-022230-


7 Day Forecast for Marine Location Near Marinette, WI
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location: 45.09, -87.58     debug


Area Discussion for - Green Bay, WI
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FXUS63 KGRB 021743 AFDGRB

Area Forecast Discussion National Weather Service Green Bay WI 1243 PM CDT Thu Apr 2 2020

Updated aviation portion for 18Z TAF issuance

SHORT TERM. Today . Tonight . and Friday Issued at 315 AM CDT Thu Apr 2 2020

Warm advection on the west side of an upper ridge was producing middle clouds and a few sprinkles over northcentral Wisconsin at 300am. These sprinkles should end by daybreak as the best warm advection shifts off to the north. A sharp upper ridge will move slowly across the area today and keep the weather mild and dry. Highs today will be 5 to 10 degrees above normal, though quite a bit cooler near the lake and bay.

Clouds will increase across the area tonight as the upper ridge moves off to the east. There could be some light rain in the far western counties of the forecast area towards morning as the upper flow becomes diffluent and warm advection increases once again. The clouds will keep temperatures a few degrees above normal.

Rain will become likely across central and northcentral Wisconsin by Friday afternoon as a cold front slowly approaches from the west. The rain may not reach the Door Peninsula until friday evening. Highs will remain above normal despite cloud cover and increasing chance of rain. Light rainfall amounts are expected.

LONG TERM. Friday Night Through Wednesday Issued at 315 AM CDT Thu Apr 2 2020

Forecast concerns continue to revolve around timing precip chances through the middle of next week. There are two primary periods when precip is likely or possible, Friday night and also Monday through Wednesday. The latest medium range models continue to struggle with precip timing and amounts early next week as they try to resolve an upper low digging south along the west coast. Prefer the ensemble means/ecmwf for later periods.

Friday night through Saturday night . A cold front will bring a band of widespread rain to the region on Friday night. Mid-level fgen will weaken as the front outruns its upper support, so precip amounts will likely be higher over north-central WI than northeast WI. Amounts look to be all over the map ranging from 3/4" in the gfs to around a 1/4" in the ecmwf/canadian. Prefer the latter amounts as they match up better with the ensemble means. The front also looks to exit eastern WI quicker than previously advertised 24 hours ago, and will only keep a small chance of rain right along the Lake Michigan shoreline on Saturday morning. A super dry airmass will then move into the region once precip ends. Precipitable water values are forecast to fall into the 0.1" to 0.25" range by midday Saturday. This airmass should then result in clear to mostly clear skies from Saturday afternoon through Saturday night.

Rest of the forecast . The dry conditions will then continue through Sunday and most of Sunday night. Once again, the gfs tries to quickly return precip into the area on Sunday night within a developing warm advection regime. But because of the dry airmass, think a slower timing is preferred, which would increase light rain chances late Sunday night into Monday. Models continue to suggest a more moderate rain is possible on Tuesday when low pressure traverses the region. The strength of the low appears weaker than 24 hours ago, so confidence remains rather low. Light rain chances could persist into Wednesday, particularly over far northern WI, as a upper trough moves across the northern Great Lakes.

AVIATION. for 18Z TAF Issuance Issued at 1243 PM CDT Thu Apr 2 2020

VFR conditions are expected to continue through the day today across all sites. Upper to middle level clouds will move in from the west through the afternoon and evening, but will only approach MVFR conditions towards the end of the TAF period tomorrow morning; mainly for central Wisconsin at CWA, AUW, and RHI. Light rain may arrive as early as tomorrow afternoon, but there is a decent chance that most of it will hold off until well after the current TAF period, starting Friday evening.

GRB WATCHES/WARNINGS/ADVISORIES. NONE.

SHORT TERM . RDM LONG TERM . MPC AVIATION . Uhlmann


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MN4 - 9087088 - Menominee, MI 1 mi190 min ENE 4.1 G 4.1 37°F 38°F1022.4 hPa33°F
NPDW3 - Northport Pier at Death's Door WI 35 mi198 min WNW 7 G 7 34°F 1022.7 hPa
KWNW3 - 9087069- Kewaunee, WI 43 mi190 min Calm G 2.9 41°F 1022.4 hPa

Wind History for Menominee, MI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Menominee - Marinette Twin County Airport, MI3 mi62 minESE 610.00 miFair47°F35°F63%1023 hPa
Door County Cherryland Airport, WI21 mi62 minNNE 410.00 miFair50°F36°F59%1022.8 hPa

Link to 5 minute data for KGRB

Wind History from GRB (wind in knots)
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Last 24hrNE8N9NE6--N4CalmNE4NE5N3CalmCalmW3CalmCalmCalmCalmN3CalmCalmCalmCalm3SE73
1 day agoNE13NE12NE7NE7NE7NE8NE6NW4NE5NE5NE7NE10NE10NE8NE7N5N6N7N6NE6NE9NE7N5NE5
2 days agoN15
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NE7NE6NE5NE5NE8NE9NE11NE12NE12NE14NE14N11NE15
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Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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wmap_A
GEOS Local Image of GreatLakes    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 Green Bay, WI (13,3,4,5)
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Ground Weather Radar Station Green Bay, WI
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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.