Tuesday, September29, 2020
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Marine Weather and Tides
Marinette, 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 6:46AMSunset 6:37PM Tuesday September 29, 2020 8:50 PM CDT (01:50 UTC) Moonrise 6:12PMMoonset 4:13AM Illumination 95% Phase: Waxing Gibbous; Moon at 13 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- 252 Pm Cdt Tue Sep 29 2020
.small craft advisory in effect from Wednesday morning through Wednesday evening...
Tonight..W wind 10 to 15 kts. Waves 2 ft or less. A chance of showers in the evening.
Wednesday..NW wind 10 to 15 kts, increasing to 15 to 25 kts early in the afternoon. Waves building to 2 to 4 ft. A chance of showers. A slight chance of Thunderstorms in the afternoon. A slight chance of waterspouts in the afternoon.
Wednesday night..NW wind 15 to 20 kts with gusts to around 25 knots, easing to 10 to 15 knots late evening and overnight. Waves 2 to 4 ft, subsiding to 1 to 3 ft. Partly cloudy.
Thursday..N wind 10 to 15 kts. Waves 1 to 3 ft. Partly Sunny.
LMZ521 Expires:202009300400;;558595 FZUS53 KGRB 291952 NSHGRB Nearshore Marine Forecast National Weather Service Green Bay WI 252 PM CDT Tue Sep 29 2020 For waters within five nautical miles of shore on Lake Michigan LMZ521-522-300400-


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 292351 AFDGRB

Area Forecast Discussion National Weather Service Green Bay WI 651 PM CDT Tue Sep 29 2020

Updated aviation portion for 00Z TAF issuance

SHORT TERM. Tonight and Wednesday Issued at 240 PM CDT Tue Sep 29 2020

A short wave trough will move through the region for the rest of the afternoon and early evening, with showers tapering off from west to east in it's wake. Have gone a bit more aggressive in ending the pops, as the regional radar mosaic only shows isolated showers lingering back over MN and NW WI. Should see at least partial clearing during the evening and early overnight hours, leading to the possibility of catching a glimpse of the expected aurora borealis. The next short-wave and associated cold front is expected to arrive in our western counties late tonight, and impact the remainder Wednesday morning. Will see another uptick in shower activity as this occurs. Models suggest some weak CAPE and steep mid-level lapse rates over the area in the late morning and afternoon, so kept a small chance of storms in the forecast.

Lows tonight will be in the 40s. Highs on Wednesday should reach the 50s, and possibly near 60 far southeast.

LONG TERM. Wednesday Night Through Tuesday Issued at 240 PM CDT Tue Sep 29 2020

Minimal changes to the forecast since the last issuance. Models are consistent with keeping a large upper trough across the Upper Midwest and Great Lakes region through the weekend, the pattern then becomes more progressive early next week. With the trough in place expect to see several periods of scattered showers as shortwave energy ripples through the mean flow. Temperatures will also remain below normal with cooler air locked in place, especially on Friday and this weekend.

Wednesday night and Thursday . With a shortwave moving across the area expect scattered showers to continue. Instability seems to wane as the sun sets Wednesday evening, so kept the mention of thunder out of the forecast after 00Z/Thurs. Low temps across the north drop into the low to middle 30s Thursday morning, so it's possible a few snowflakes also materialize at the surface, but not expecting any accumulation. Specific timing of the showers remains a forecasting challenge, as it appears showers are possible through most of Thursday. Therefore, kept at least slight chance PoPs across the entire forecast area through 00Z/Friday.

Rest of the forecast . A surface high pressure builds into the area Friday, which attempts to keep the area dry. Models are not completely sold on this, as some instability showers may still be possible during the afternoon. Kept the forecast dry for now as moisture is limited. Then, a more potent shortwave impacts the area Saturday night through Sunday. Rain showers are a good bet, and once again some snow may be possible across the Northwoods where temperatures fall close to freezing Sunday morning. Dry weather and seasonable temperatures are expected early next week as the trough moves east.

AVIATION. for 00Z TAF Issuance Issued at 643 PM CDT Tue Sep 29 2020

VFR/MVFR conditions early in the TAF period will give way to VFR conditions through much of the night. Yet another shortwave and frontal boundary/trough will slide through the area late tonight into Wednesday, bringing another chance of VFR ceilings along with a few rain showers. Winds will become gusty out of the west to northwest Wednesday afternoon as the pressure gradient tightens across the area. Gusts will generally be between 20 and 25 kts.

MARINE. Issued at 240 PM CDT Tue Sep 29 2020

Cool 850 mb temperatures and fairly warm lake temperatures, around 15 to 16 degrees Celsius, will bring the chance for waterspouts at times to the nearshore waters Wednesday afternoon into Thursday. 850 mb temperatures today will cool to 2 to 3 celsius by Wednesday afternoon, with convective cloud depths of 20 to 25k ft. By Thursday 850 mb temperatures fall to -1 to -3 celsius, with slowly falling convective cloud depths through the afternoon hours. Due to the deeper cloud depths, will include waterspouts starting Wednesday afternoon, and continue through Thursday with better over-water instability. The threat for waterspouts should dissipate by Thursday evening as convective cloud depths become shallower.

Increasing west to northwest winds will gust over 25 knots at times Wednesday into early Wednesday evening, and again Thursday into Thursday evening. A Small Craft Advisory is in effect from 10 am to 10 pm Wednesday.

GRB WATCHES/WARNINGS/ADVISORIES. NONE.

SHORT TERM . Kieckbusch LONG TERM . KLJ AVIATION . Cooley MARINE . Kieckbusch


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MN4 - 9087088 - Menominee, MI 1 mi51 min SSW 8.9 G 12 53°F 63°F1005.1 hPa51°F
CBRW3 - Chambers Island, WI 14 mi71 min S 8 G 12 54°F
45014 22 mi51 min SW 18 G 19 55°F 1005.2 hPa (-0.3)
KWNW3 - 9087069- Kewaunee, WI 43 mi51 min SSW 2.9 G 6 53°F 1005.9 hPa
GBWW3 44 mi51 min Calm G 4.1 54°F 1005 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 mi55 minSW 610.00 miLight Rain52°F48°F89%1005.3 hPa
Door County Cherryland Airport, WI21 mi55 minSSW 710.00 miLight Rain52°F48°F89%1006 hPa

Link to 5 minute data for KMNM

Wind History from MNM (wind in knots)
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Last 24hr3NW3W43W4W4W4W6W5W4W4W8
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1 day agoSW4W3W3SW4SW4SW3W3SW3SW3CalmCalmCalmCalmCalmCalm4N6
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2 days agoS9S8SW10SW8SW8
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4Calm5SW6W5SW6SW7SW7SW8SW13
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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    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
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.