Thursday, April22, 2021
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Marine Weather and Tides
Sheboygan, 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 5:54AMSunset 7:44PM Thursday April 22, 2021 10:10 PM CDT (03:10 UTC) Moonrise 2:15PMMoonset 4:00AM Illumination 85% Phase: Waxing Gibbous; Moon at 11 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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LMZ669 Expires:202104230915;;971132 Fzus63 Kmkx 230139 Glflm Open Lake Forecast For Lake Michigan National Weather Service Milwaukee/sullivan Wi 839 Pm Cdt Thu Apr 22 2021 For Waters Beyond Five Nautical Miles Of Shore On Lake Michigan. Waves Are Provided As A Range Of Significant Wave Heights, Which Is The Average Of The Highest 1/3 Of The Wave, Along With The Average Height Of The Highest 10% Of The Waves Which Will Occasionally Be Encountered.
Synopsis.. Southerly winds over the lake this evening will shift to the southwest early Friday morning with speeds around 10 to 20 knots and gusts up to 25 knots over the northern third of the lake. High pressure around 30.3 inches over the ohio river valley will slowly shift eastward with a low pressure of 29.9 inches moving through the northern great lakes Friday night into Saturday. This will drag a cold front through the region with northerly winds building behind the front Saturday night into Sunday. && lmz080-669-671-673-675-777-779-870-872-874-876-878-230915- lake michigan from michigan city in to st. Joseph mi 5 nm offshore to mid lake- lake michigan from sheboygan to port washington wi 5 nm offshore to mid lake- lake michigan from port washington to north point light wi 5 nm offshore to mid lake- lake michigan from north point light to wind point wi 5 nm offshore to mid lake- lake michigan from wind point wi to winthrop harbor il 5 nm offshore to mid lake- lake michigan from winthrop harbor to wilmette harbor il 5 nm offshore to mid lake- lake michigan from wilmette harbor il to michigan city in 5 nm offshore to mid lake- lake michigan from whitehall to pentwater mi 5 nm offshore to mid lake- lake michigan from grand haven to whitehall mi 5 nm offshore to mid lake- lake michigan from holland to grand haven mi 5 nm offshore to mid lake- lake michigan from south haven to holland mi 5 nm offshore to mid lake- lake michigan from st. Joseph to south haven mi 5 nm offshore to mid lake- 839 pm cdt Thu apr 22 2021 sheboygan wi to pentwater mi south...
Rest of tonight..South winds 10 to 20 kt becoming southwest. Waves 3 to 5 ft.
Friday..Southwest winds 10 to 20 kt becoming south. Slight chance of rain showers in the afternoon. Waves 3 to 5 ft.
Friday night..South winds 10 to 20 kt becoming southeast 5 to 10 kt. Chance of rain showers overnight. Waves 2 to 4 ft subsiding to 1 to 3 ft.
Saturday..Southeast winds 5 to 10 kt backing to north. Chance of rain showers. Waves 1 to 2 ft.
Saturday night..North winds 15 to 25 kt increasing to 30 kt. Chance of rain showers in the evening. Waves 3 to 5 ft building to 4 to 7 ft occasionally to 9 ft.
Sunday..North winds 15 to 25 kt diminishing to 10 to 20 kt. Waves 4 to 7 ft occasionally to 9 ft subsiding to 4 to 6 ft occasionally to 8 ft.
Sunday night..Northeast winds 10 to 15 kt becoming southeast 10 to 20 kt. Waves 2 to 4 ft subsiding to 1 to 3 ft.
Monday..Southeast winds 10 to 20 kt increasing to 15 to 25 kt. Waves 4 to 6 ft occasionally to 8 ft building to 4 to 7 ft occasionally to 9 ft.
Tuesday..South winds 10 to 20 kt. Waves 4 to 6 ft occasionally to 8 ft.
LMZ669


7 Day Forecast for Marine Location Near Sheboygan, WI
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location: 43.71, -87.19     debug


Area Discussion for - Milwaukee/Sullivan, WI
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FXUS63 KMKX 230256 AFDMKX

Area Forecast Discussion National Weather Service Milwaukee/Sullivan WI 956 PM CDT Thu Apr 22 2021

UPDATE. (Issued 955 PM CDT Thu Apr 22 2021)

Drier air is holding across southern WI, E IA, and W IL this evening. We'll gradually see dewpoints increase through Friday morning but latest hires models and NAM have backed off on precip a bit for Friday. Lowered pops a bit but still kept slight chances in there as there will be good mid-level moisture and forcing that should support some shower development. It just might be a scenario where the low-level dry air gets entrained and limits coverage and evaporates some of the precip before it reaches the surface. Made some minor adjustments to the temps for tonight. Otherwise, the rest of the forecast is on track.

Stumpf

SHORT TERM. (Issued 242 PM CDT Thu Apr 22 2021)

Tonight through Friday night:

Chances for rain have increased going into Friday with the weakening shortwave moving through the area during the morning and afternoon. 700mb temperature advection and frontogenesis will help saturate the lower levels resulting in light showers. Not seeing much in the way of instability so no storms are expected. Drier conditions look to move in for Friday night as we lose our synoptic lift briefly.

RAH

LONG TERM. (Issued 242 PM CDT Thu Apr 22 2021)

Saturday through Thursday:

A deeper trough moves through Saturday with plenty of positive vorticity advection and support from the upper level jet with some speed divergence aloft. This will bring another round of showers to the area, but no storms are expected and looking at ensembles amounts would be a few hundreths to a couple tenths.

Southerly flow really kicks in for next week bringing warmer temperatures to the area with highs in the 60s and 70s. We'll have to watch the potential for some storms associated with the 850 mb jet and the warm front Sunday and Monday. A deep trough looks to push through the CONUS and bring a decent shot for rain and thunderstorms mid week next week. Uncertainty with the timing and exact amounts this far out but it should bring some well needed rain.

RAH

AVIATION. (Issued 955 PM CDT Thu Apr 22 2021)

A system will move into northern Wisconsin tonight through Friday afternoon. This will bring increasing mid-level clouds with bases remaining above 6,000 ft. As winds become more S/SW through Friday morning expect moisture to slowly build northward. This will result in a gradual lowering of cigs from Friday afternoon through Friday night. A few light showers are possible on Friday but with dry air still present near the surface cigs should stay VFR.

Stumpf

MARINE. (Issued 242 PM CDT Thu Apr 22 2021)

High pressure over the Ohio Valley will slowly shift eastward. Southerly winds will become more southwesterly overnight but then shift back to the south Friday ahead of our next low pressure system. Winds will shift to the north behind the front Saturday and build into Saturday night with gusts up to 30 knots over the open waters. Winds may approach Small Craft criteria in the nearshore waters Saturday night into Sunday.

RAH

MKX WATCHES/WARNINGS/ADVISORIES. WI . None. LM . None.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SGNW3 - Sheboygan, WI 27 mi70 min S 12 G 14 41°F
PWAW3 - Port Washington, WI 42 mi90 min S 8 G 12 42°F 1016.3 hPa
BSBM4 - Big Sable Point, MI 43 mi90 min S 8 G 12 40°F 1016.3 hPa
LDTM4 - 9087023 - Ludington, MI 43 mi52 min S 5.1 G 6 42°F 24°F

Wind History for Ludington, MI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Sheboygan County Memorial Airport, WI35 mi77 minS 310.00 miFair38°F31°F76%1015.4 hPa

Link to 5 minute data for KSBM

Wind History from SBM (wind in knots)
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Last 24hrSW6SW5SW4SW3W5W4W4W6W4W3W6SW8
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1 day agoW3CalmCalmCalmCalmCalmNE3NE4NE8NE8N7NE9N8Calm3SE3SE7SE6SE8SE6S7S7SW6Calm
2 days agoN9N9NW8N7NW4NW4NW5NW5NW4NW4NW5--W4N8N7N9NW7E7SE9SE8S3SE4CalmCalm

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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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