Saturday, December7, 2019
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Marine Weather and Tides
Athens, WI

Version 3.4
NOTICE
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.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 7:20AMSunset 4:18PM Saturday December 7, 2019 8:06 AM CST (14:06 UTC) Moonrise 2:14PMMoonset 2:21AM Illumination 81% 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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7 Day Forecast for Marine Location Near Athens, WI
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location: 45.09, -90.06     debug


Area Discussion for - Green Bay, WI
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FXUS63 KGRB 071044 AFDGRB

Area Forecast Discussion National Weather Service Green Bay WI 444 AM CST Sat Dec 7 2019

Updated aviation portion for 12Z TAF issuance

SHORT TERM. Today . Tonight . and Sunday Issued at 329 AM CST Sat Dec 7 2019

The main concern in the short-term portion of the forecast will be the potential for light snow or light freezing drizzle Sunday evening.

Today: The shortwave and theta-E gradient passing through the area early this morning, is expected to shift well east of the area by mid morning. Otherwise, the flow on the back side of a surface ridge over the eastern CONUS, will allow a ribbon of moisture at and below 850mb to advect across the area throughout the day. This will likely lead to mostly cloud conditions, with an outside chance of some flurries/sprinkles. The moisture is shallow enough that the increased cloud cover is expected to be the main impact for this time period. High temperatures are expected to range in the low to mid 30s.

Tonight and Sunday: As the high pressure system continues to shift eastward, a cold front is expected to sag southeastward out of western Ontario. The deeper moisture and better forcing are expected to remain northwest of the area through much of this time period. Moisture across most of northeast Wisconsin will likely remain in the lower levels of the atmosphere, generally around 800mb and below. This would limit any precipitation potential to some patchy light drizzle at times. The best chance of this occurring, would be across north-central and possibly central Wisconsin as the trough approaches during the day Sunday. It is not totally out of the question for a few flurries or light snow showers to mix in, but most of the moisture is expected to remain warmer than the dendritic growth zone, limiting any ice crystal formation. Perhaps the more impactful time period will be later in the evening. Temperatures are expected to drop to near or just below freezing across north-central Wisconsin, which may allow some of the drizzle to freeze on area roadways. Otherwise, lows tonight are expected to be in the upper 20s to around 30 with highs expected to be in the 30s to around 40 (warmest east- central).

LONG TERM. Sunday Night Through Friday Issued at 329 AM CST Sat Dec 7 2019

No significant changes to the overall pattern over the next week, as medium range model guidance continues to indicate brief amplification of the upper air pattern in the Monday-Wednesday time frame. As this occurs, a cyclone remains expected to move across the Great Lakes, which will give the region the next chance of widespread wintry weather. Track differences continue to be apparent in the latest model runs, with the Canadian the furthest north. This solution looks like an outlier, so will continue with a ecmwf/gfs blend.

Sunday night through Monday night . An arctic cold front will exit northeast WI early Sunday evening before settling over southern Lake Michigan by 12z Monday. Forecast soundings insist on the potential for drizzle to continue during the evening along and behind the front, as saturation struggles to reach above the -10C isotherm. With cooling surface temperatures behind the front, spotty freezing drizzle looks like a possibility over central and north-central WI into the early overnight hours. Some freezing drizzle also looks possible over northeast WI late Sunday night into Monday morning. Models are a little slower bringing the surface low into the Great Lakes late Sunday night into Monday, thereby delaying the arrival of deeper moisture. As shortwave energy moves out of the Plains and towards the Great Lakes, trends support precip changing from drizzle/freezing drizzle over to snow from northwest to southeast late Sunday night into Monday morning. Most of the snow should then continue through the afternoon before diminishing during the evening. Potential accumulations haven't changed much, and still looking at a 2 to 5 inch snowfall for most locations north and west of the Fox Valley , highest over north-central WI. As colder air arrives behind the low, temperatures will likely hold steady or gradually fall through the day. Highs ranging from the upper teens in the north to the low 30s along the Lake.

Rest of the forecast . A digging longwave trough will bring in the coldest temps of the season during the Tuesday through Thursday time period. Wind chills look to be the coldest on Tuesday night into Wednesday morning when readings of 15 to 30 below are possible. With the arctic high centered across the region on Wednesday night, and fresh snow cover on the ground, temps may need be lowered further. Then temperatures start to moderate towards the end of the next work week. There might be a chance of snow during this time as warmer air invades the region, but details are too elusive to include in the forecast.

AVIATION. for 12Z TAF Issuance Issued at 444 AM CST Sat Dec 7 2019

VFR conditions to possible MVFR conditions early in the day will give way to mainly VFR conditions. Some light snow showers or flurries are possible early in the TAF period across RHI. LLWS is possible tonight into early Sunday morning across all of the TAF sites as a low-level jet develops.

GRB WATCHES/WARNINGS/ADVISORIES. NONE.

SHORT TERM . Cooley LONG TERM . MPC AVIATION . Cooley


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Taylor County Airport, WI13 mi71 minSSE 710.00 miMostly Cloudy17°F14°F89%1021.3 hPa
Merrill, Merrill Municipal Airport, WI20 mi71 minSSE 310.00 miOvercast19°F15°F84%1022.3 hPa

Link to 5 minute data for KMDZ

Wind History from MDZ (wind in knots)
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Last 24hrNW7N9NW7NW6NW5CalmW7W6W5SW3CalmCalmCalmCalmS3CalmCalmSE3S5SE6SE4SE5S3S6
1 day agoCalmSE4S5SE5SE4S6SE6SE4CalmS5CalmCalmN5N7N10N13
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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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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 (9,2,3,4)
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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 numerious 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.