Wednesday, April21, 2021
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Marine Weather and Tides
Sister Bay, WI

Version 3.4
NOTICE
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 5:55AMSunset 7:45PM Wednesday April 21, 2021 5:48 AM CDT (10:48 UTC) Moonrise 12:58PMMoonset 3:32AM Illumination 70% Phase: Waxing Gibbous; Moon at 9 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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LMZ541 Expires:202104211615;;884925 Fzus53 Kgrb 210835 Nshgrb Nearshore Marine Forecast National Weather Service Green Bay Wi 335 Am Cdt Wed Apr 21 2021 For Waters Within Five Nautical Miles Of Shore On Lake Michigan Lmz521-522-541>543-211615- 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- 335 Am Cdt Wed Apr 21 2021
Today..N wind 5 to 10 kts veering se mid-day, then veering S early in the afternoon. Waves 2 ft or less. A chance of snow and rain showers.
Tonight..SW wind 5 to 10 kts becoming w. Waves 2 ft or less. A slight chance of rain and snow showers in the evening.
Thursday..W wind 10 to 15 kts. Waves 2 ft or less. Sunny.
Thursday night..SW wind 10 to 15 kts. Waves 1 to 3 ft. Mostly clear.
LMZ541


7 Day Forecast for Marine Location Near Sister Bay, WI
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location: 45.19, -87.12     debug


Area Discussion for - Green Bay, WI
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FXUS63 KGRB 210830 AFDGRB

Area Forecast Discussion National Weather Service Green Bay WI 330 AM CDT Wed Apr 21 2021

Forecast discussion for routine morning forecast issuance

SHORT TERM. Today . Tonight . and Thursday Issued at 329 AM CDT Wed Apr 21 2021

Weak shortwave troughs rotating around an upper low to our east will produce scattered snow showers through early this evening. There could be some rain if boundary layer temperatures are warm enough during the afternoon. The high resolution NMM model was doing a great job with the snow across east central Wisconsin this morning and decided to utilize it for the rest of the day. A small snow accumulation on the grass is likely where it snows for any length of time, but warmer pavement temperatures will probably keep roads and sidewalks from getting too slick. Highs today will be around 15 degrees below normal.

As the upper low moves away and surface high pressure arrives from the west skies should clear later tonight, with low temperatures 10 to 15 degrees below normal.

Milder air will arrive Thursday with downsloping west winds. Highs will be close to normal for this time of the year.

LONG TERM. Thursday Night Through Tuesday Issued at 329 AM CDT Wed Apr 21 2021

Weak weather systems will bring chances for light precip to the area at times Friday into the weekend then a larger and stronger system will track toward the area for the middle of next week. Temps will be on somewhat of a rollercoaster ride through the period, starting off near normal on Friday, dropping below normal by Sunday, then climbing above normal Tuesday, but some uncertainty remains on just how far the warm front will be able to make it and how warm parts of the area will get.

Thursday night . surface high pressure will slide through the Ohio Valley, as brief mid-upper level ridging crosses the western Great Lakes. This will bring dry conditions to the area. Mostly clear skies are expected in the evening, then clouds will begin to increase in the late evening and overnight hours. It won't be as cold as previous nights with weak WAA continuing along with southwest winds. Lows look to be in the 30s.

Friday into the weekend . the ridging will quickly be replaced by a fast moving shortwave trough that will move across the area on Friday, arriving as early as mid-morning. Then a mid-upper level trough will swing across the Great Lakes on Saturday, along with a cold front. Only light precip will be possible with these features, as a system heading toward the Ohio Valley will intercept the deeper Gulf moisture. Hard to pin down exact timing and location of best rain chances, so low end PoPs will be included for several period even though much of the time it will be dry. Will keep highest PoPs over northern WI on Saturday as the front pushes through. Thermal profiles showing mainly rain showers during the day, and a rain/snow mix at night, especially over northern WI. Mid and upper level ridging and surface high pressure builds into the western Great Lakes on Sunday. The surface front will push back toward the area as a warm front during the day on Sunday, which in combination with a strong push of WAA, could trigger some shower activity, but models not in very good agreement on if/where this would occur. As for temps, Friday will see another day with highs in the middle 50s to lower 60s. Temps will cool off closer to the front across north central and central WI on Saturday, but another day with highs near normal is expected farther east. A brief shot of CAA will send temps below normal on Sunday.

Rest of the long term . attention turns to a slowly developing low pressure system over the Plains early next week along with where the warm front will be situated. On Monday, WAA and moisture advection aided by a low level jet could kick off some shower activity once again, especially over northern WI, but confidence is low on this occurring. Better chances for widespread showers, along with the chance of some storms, arrives as the low pressure and cold front track toward the area later on Tuesday (and more likely on Wednesday). Temps will be dependent on how far north the warm front can move. A good representation of this is the 20 degree spread in the NBM for the 25/75 percentiles. The cool waters of the Great Lakes will likely at least slow the northward progression of the front, especially over eastern WI. Enough WAA should push the warm front through the area on Tuesday, with temps climbing to the 60s and 70s for most spots, except cooler near Lake Michigan.

AVIATION. for 06Z TAF Issuance Issued at 1029 PM CDT Tue Apr 20 2021

Isolated snow showers and flurries will linger overnight, especially in the SE 1/2 of the area. Breaks will continue to develop in the cloud cover. The convective temperature will be reached by mid-late morning tomorrow, resulting in the quick development of Sc at the CCL. The air will be dry enough to result in mainly VFR conditions, though some local/brief MVFR and IFR conditions will exist, especially with the SHSN.

GRB WATCHES/WARNINGS/ADVISORIES. NONE.

SHORT TERM . RDM LONG TERM . Bersch AVIATION . Skowronski


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NPDW3 - Northport Pier at Death's Door WI 10 mi68 min NW 12 G 16 29°F 1020 hPa
CBRW3 - Chambers Island, WI 13 mi68 min WNW 9.9 G 14 29°F
MN4 - 9087088 - Menominee, MI 26 mi48 min WNW 4.1 G 7 26°F 50°F1018.5 hPa (+0.0)17°F
FPTM4 - Fairport, MI 38 mi68 min NNW 5.1 G 8.9 28°F

Wind History for Menominee, MI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Menominee - Marinette Twin County Airport, MI27 mi53 minN 010.00 miFair21°F18°F88%1020.9 hPa

Link to 5 minute data for KMNM

Wind History from MNM (wind in knots)
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Last 24hrW33N5N7N10N14
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45N10SE10SE9SE6SE6SE8SE8NE8NE6NE5NE5NE5CalmCalmCalm
1 day agoNW8
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2 days agoCalmCalmSW4S6SW6SW8S11S10S12
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S8S10S8S11S6S6S5W63N11
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Tide / Current Tables for
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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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