Sunday, October22, 2017 L-36.com


Marine Weather and Tides
Green Bay, WI

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 7:16AMSunset 5:56PM Sunday October 22, 2017 1:20 AM CDT (06:20 UTC) Moonrise 9:53AMMoonset 7:59PM Illumination 4% Phase: Waxing Crescent; Moon at 2 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 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- 925 Pm Cdt Sat Oct 21 2017
.small craft advisory in effect through Sunday morning...
Rest of tonight..S wind 15 to 25 kts. Waves 3 to 5 ft. A chance of showers and perhaps an isolated Thunderstorm after midnight.
Sunday..S wind 15 to 25 kts veering W 10 to 20 kts in the late morning. Waves 2 to 4 ft subsiding to 1 to 3 ft in the afternoon. Showers likely. A slight chance of a Thunderstorm in the morning.
Sunday night..W wind 10 to 15 kts. Waves 2 ft or less. A chance of a shower in the evening then clearing.
Monday..SW wind 5 to 10 kts. Waves 2 ft or less. Partly cloudy in the morning then becoming mostly cloudy.
LMZ522 Expires:201710221015;;214116 FZUS53 KGRB 220225 NSHGRB Nearshore Marine Forecast National Weather Service Green Bay WI 925 PM CDT Sat Oct 21 2017 For waters within five nautical miles of shore on Lake Michigan LMZ521-522-221015-

7 Day Forecast for Marine Location Near Green Bay, WI
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location: 44.52, -87.98     debug


Area Discussion for - Green Bay, WI
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Fxus63 kgrb 220336
afdgrb
area forecast discussion
national weather service green bay wi
1036 pm cdt Sat oct 21 2017
updated aviation portion for 06z TAF issuance

Short term Tonight and Sunday
issued at 209 pm cdt Sat oct 21 2017
the main forecast concerns center around timing of precipitation
later tonight, convective potential and temperatures for Sunday as
colder air arrives.

The 19z msas surface analysis a cold front which extended from
near lake winnipeg south through extreme western mn, far eastern
ne and points south. A tight pressure gradient existed across wi
in advance of the front with gusts of 20 to 30 mph at times.

Visible satellite imagery showed clouds over the western half of
wi, while eastern wi enjoyed mostly sunny and warm conditions.

Finally, the last of the morning showers from a mid-level
shortwave are exiting northern wi.

Models are still in good agreement with sending the cold front
into wi later tonight (but remaining west of the forecast area).

The models also bring mucapes to around 400 j kg into central wi
this evening, thus cannot rule out a few storms approaching
central wi. Despite in instability weakening through the night,
this would be countered by increasing shear and lift as the front
gets closer. Due to the shear, the chance of seeing thunderstorms
will continue through the night with gusty winds possible, but
remaining sub-severe. Highest pops placed over central wi, while
lakeshore counties may not see any precipitation until the pre-
dawn hours. Min temperatures to remain mild for one more night
with readings in the lower to middle 50s central wi, upper 50s to
lower 60s eastern wi.

The cold front is expected to slowly push east across central and
eastern wi on Sunday, partially impeded by an upper ridge situated
over the east coast. It may take until mid-afternoon before the
front reaches lake mi, thus showers to persist over the entire
forecast area Sunday morning, then gradually diminish over central
wi during the afternoon. Have kept the slight chance of thunder
over eastern wi into Sunday morning, but not overly confident in
this. Have also slowed the rate of clearing over central wi Sunday
afternoon due to the slow movement of the front. MAX temperatures
may easily occur in the morning as colder air starts to sweep into
wi. This would place readings in the middle to upper 50s central,
lower 60s eastern wi before slowly holding steady or slowly
falling in the afternoon.

Long term Sunday night through Saturday
issued at 209 pm cdt Sat oct 21 2017
the stretch of dry and mild weather provided by an upper level
ridge will be replaced by an active, cooler weather pattern as a
long wave trough establishes itself across the great lakes region
during the upcoming week. While the models seem to be in better
agreement regarding a large low pressure system moving through the
central great lakes Monday and Tuesday, there are discrepancies
on how quickly the low pulls out of the great lakes region. The
speed of the low makes the difference between drier and warmer
weather or rainy and cooler conditions. Given the model
discrepancies did not differ much from the superblend.

Another low pressure system will track through the western great
lakes area during the late part of the week. Again the models are
in the general vicinity but the exact placement of the low is off
amongst the models, making for a low confidence forecast that far
out. Models such as the canadian and ECMWF keep the main low to
the north with little to no QPF over our area while the further
south GFS has a swath of QPF across the northern cwa. This slow
moving low will linger into next Saturday, continuing the
precipitation chances across the region.

The aforementioned cooler air will mean snow could mix in at times
during the mid to late week storm systems. However given the
fairly warm ground and mixing with rain not much if any snowfall
accumulation is expected.

Aviation For 06z TAF issuance
issued at 1036 pm cdt Sat oct 21 2017
a cold front will move slowly across the region late tonight and
Sunday. It will be accompanied by several hours of showers and
scattered thunderstorms along with MVFR and brief ifr conditions.

The front should exit eastern wisconsin by midday, with quickly
improving conditions following behind it. &&

Grb watches warnings advisories
None.

Short term... ..Kallas
long term... ... Kurimski
aviation... ... .Rdm


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
45014 23 mi50 min S 14 G 19 63°F 58°F1012.3 hPa
KWNW3 - 9087069- Kewaunee, WI 26 mi50 min S 12 G 15 55°F 1012.8 hPa
MN4 - 9087088 - Menominee, MI 45 mi50 min S 8 G 11 62°F 1012.4 hPa57°F

Wind History for Kewaunee MET, WI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Green Bay, Austin Straubel International Airport, WI8 mi27 minS 1210.00 miFair66°F59°F78%1012.2 hPa

Wind History from GRB (wind in knots)
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Last 24hrS9S10S8S8S8S8S8S8S10S14S16
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1 day agoS5S4S6S7S6S6S6S9S10S7SW12S12S11
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2 days agoW11W10W5SW5SW5SW5W6W7W10W7W9W8SW10SW7SW8SW5S5S5S6S6S5S6S5S4

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map and Satellite Images
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Weather Map
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of GreatLakes    EDIT
Geos

Wind Forecast for Green Bay, WI (2,6,7,8)
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Ground Weather Radar Station Green Bay, WI
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weather_mapweather_map weather_map

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Disclaimer:
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.