Tuesday, April13, 2021
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Marine Weather and Tides
Oconto, 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 6:10AMSunset 7:35PM Monday April 12, 2021 11:37 PM CDT (04:37 UTC) Moonrise 6:46AMMoonset 8:15PM Illumination 1% Phase: Waxing Crescent; Moon at 1 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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LMZ522 Expires:202104131015;;465936 Fzus53 Kgrb 130241 Nshgrb Nearshore Marine Forecast National Weather Service Green Bay Wi 941 Pm Cdt Mon Apr 12 2021 For Waters Within Five Nautical Miles Of Shore On Lake Michigan Lmz521-522-541>543-131015- 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- 941 Pm Cdt Mon Apr 12 2021
Rest of tonight..SW wind 10 to 15 kts. Waves 2 ft or less. Isolated showers.
Tuesday..SW wind 10 to 15 kts. Waves 2 ft or less. Isolated showers.
Tuesday night..W wind 5 to 10 kts. Waves 2 ft or less. A chance of rain and snow showers.
Wednesday..NW wind 5 to 10 kts. Waves 2 ft or less. A chance of showers.
LMZ522


7 Day Forecast for Marine Location Near Oconto, WI
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location: 44.89, -87.87     debug


Area Discussion for - Green Bay, WI
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FXUS63 KGRB 130347 AFDGRB

Area Forecast Discussion National Weather Service Green Bay WI 1047 PM CDT Mon Apr 12 2021

Updated aviation portion for 06Z TAF issuance

SYNOPSIS. Issued at 216 PM CDT Mon Apr 12 2021

Cool with scattered showers at times the next few days, then quiet weather with temperatures near seasonal normals for the end of the week and upcoming weekend.

The blocky flow across North America will gradually transition to a more consolidated regime during the forecast period. The developing pattern will have ridging near the West Coast and a trough over central or eastern North America. The resulting northwest upper flow will keep temperatures in check and result in limited opportunities for precipitation once the upper low currently across the region exits to the east.

High Temperatures will dip below normal for the next couple days, then edge back close to seasonal normals for the rest of the period. Precipitation is likely to end up AOB normal.

SHORT TERM. Tonight and Tuesday Issued at 216 PM CDT Mon Apr 12 2021

A stubborn upper-level system will continue to bring unsettled weather to the region through Tuesday (and beyond). The main forecast issue to be extent of precipitation chances on Tuesday.

The 19Z MSAS surface analysis showed an elongated area of weak low pressure that extended from northeast MN to western Lake Superior. Clouds and scattered showers continued to rotate around this low pressure (and the upper low aloft) through WI. Enough breaks in the clouds occurred such that some locations made a run at 60 degrees over central and east-central WI.

The elongated upper low stretched from the northern Plains to the western Great Lakes and is not expected to move over the next 24 hours. Thus, more clouds and scattered light showers will remain in the forecast tonight. The loss of daytime heating would counter the passage of various shortwave rotating around the upper low, therefore precipitation chances will mostly be isolated and focused over northwest WI. There is a possibility of some snow to mix with the rain over north-central WI as temperatures cool. Look for min temperatures to range from the lower 30s north-central, to the upper 30s eastern WI.

Daytime heating, combined with the cool air aloft from the upper low should allow for isolated to scattered rain showers to develop once again over northeast WI on Tuesday. Higher pops would be in the afternoon as lapse rates steepen and additional shortwave energy moves through the region. Max temperatures will be below normal with readings in the upper 30s to around 40 degrees north- central, lower to middle 40s central WI and upper 40s to around 50 degrees eastern WI.

LONG TERM. Tuesday Night Through Monday Issued at 216 PM CDT Mon Apr 12 2021

Not much has changed since yesterday regarding the overall forecast scenario. A slow moving upper cyclone will linger across the area into Wednesday, then gradually shift off to the east. Showers will accompany the cyclone, and probably be more numerous during the afternoon/evening after daytime heating results in some low-level destabilization. Temperatures at night will be cold enough for a mix of precipitation at times in the southeast part of the forecast, and just snow showers in the northwest part of the area. A minor slushy accumulation is possible near the Upper Michigan border on Tuesday night.

The main adjustments to the standard forecast initialization grids were to tweak daytime temperatures down a little Wednesday/ Thursday, and to raise PoPs back to chance/scattered Wednesday into Wednesday evening since the upper cyclone will still be close to the area at that time.

AVIATION. for 06Z TAF Issuance Issued at 1047 PM CDT Mon Apr 12 2021

A broad upper-level system will continue to linger over the region through the middle of the week. The result will be intermittent light rain showers, especially during the daylight hours. For the most part, cigs will be in the MVFR category with brief improvements to VFR between the showers and brief downturns to IFR under any heavier showers. There could even be some snow to mix with any rain late tonight/early Tuesday morning over the RHI TAF site and again Tuesday evening.

GRB WATCHES/WARNINGS/ADVISORIES. NONE.

SYNOPSIS . Skowronski SHORT TERM . Kallas LONG TERM . Skowronski AVIATION . Kurimski


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MN4 - 9087088 - Menominee, MI 21 mi49 min SW 8.9 G 11 48°F 49°F1009.9 hPa42°F
GBWW3 25 mi55 min W 5.1 G 9.9 47°F 1010.3 hPa
CBRW3 - Chambers Island, WI 34 mi57 min S 6 G 12 46°F
KWNW3 - 9087069- Kewaunee, WI 35 mi49 min WSW 7 G 9.9 47°F 1010.8 hPa

Wind History for Menominee, MI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Menominee - Marinette Twin County Airport, MI20 mi41 minWSW 410.00 miOvercast47°F41°F80%1010.4 hPa

Link to 5 minute data for KMNM

Wind History from MNM (wind in knots)
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Last 24hrCalmCalmNE3E5NE3CalmNE3E4E7E7E4E6S46W7W84W6CalmW8SW4SW6W6SW4
1 day agoNE13
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NE144NE5N4NE5NE10E10NE10E6SE4CalmSW3SW4SW4W3S3SE4Calm
2 days agoSW6SW3CalmCalmCalmCalmCalmCalmCalmCalmCalmE4E6E7E7E8E7NE4N5N7NE5NE7NE10N12
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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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