Marine Weather and Tides
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 5:09AM||Sunset 8:26PM||Monday May 29, 2017 6:24 AM CDT (11:24 UTC)||Moonrise 9:21AM||Moonset 12:00AM||Illumination 16%|
EDIT (on/off)  Help
|LMZ542 Rock Island Passage To Sturgeon Bay Wi- Sturgeon Bay To Two Rivers Wi-two Rivers To Sheboygan Wi- 337 Am Cdt Mon May 29 2017 |
.small craft advisory in effect from 10 am cdt this morning through this evening...
Today..SW wind 10 to 20 kts veering W 15 to 25 kts in the late morning and afternoon. Waves 1 to 3 ft. Isolated showers in the morning. Isolated Thunderstorms. Scattered showers in the afternoon.
Tonight..W wind 10 to 20 kts. Waves 1 to 3 ft. A slight chance of showers.
Tuesday..W wind 10 to 15 kts. Waves 1 to 3 ft. Partly Sunny.
Tuesday night..W wind 10 to 15 kts. Waves 1 to 3 ft. Mostly cloudy.
|LMZ542 Expires:201705291615;;387770 FZUS53 KGRB 290837 NSHGRB NEARSHORE MARINE FORECAST NATIONAL WEATHER SERVICE GREEN BAY WI 337 AM CDT MON MAY 29 2017 FOR WATERS WITHIN FIVE NAUTICAL MILES OF SHORE ON LAKE MICHIGAN LMZ541>543-291615-|
7 Day Forecast for Marine Location Near Kewaunee, WIHourly EDIT Help
Area Discussion for - Green Bay, WI  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxus63 kgrb 290835|
area forecast discussion
national weather service green bay wi
335 am cdt Mon may 29 2017
forecast discussion for routine morning forecast issuance
Short term Today... Tonight... And Tuesday
issued at 335 am cdt Mon may 29 2017
a cold front will slowly make its way through the western great
lakes today. The front will bring a cooler air mass to the region,
as daytime highs are limited to the upper 50s across north-central
wisconsin, with lower to middle 60s across the rest of the cwa
where a later arrival of the front will allow some higher
temperatures. The front will also bring a return of showers and
isolated thunderstorms as a shortwave spins around the upper low
tracking through ontario, taking advantage of modest instability
from daytime heating.
Showers will diminish during the overnight hours with the loss of
daytime heating. However rain chances will return on Tuesday as a
secondary cold front tracks through the region coincident with
yet another shortwave spinning around the same persistent low
located to the north. The secondary push of cold air will keep
highs on Tuesday down into the middle 50s across north-central
wisconsin, with highs in the upper 50s to lower 60s across the
rest of the cwa.
Long term Tuesday night through Sunday
issued at 335 am cdt Mon may 29 2017
mean flow depicted by the models to consist of upper troughing
over southeast canada northeast conus, weak upper ridging over the
high plains and another upper trough over the pacific northwest.
This pattern would keep a northwest flow aloft into wi into next
weekend with timing issues of weak systems moving through the mean
flow. The main problem for next weekend will be a shortwave trough
that the models rotate southward into the great lakes with an area
of low pressure running along the southern periphery of this
trough. All in all, a dry period is expected for Wednesday early
Thursday and Friday with rain potential for Saturday Sunday.
Temperatures to warm close to normal into Friday, then cool for
the upcoming weekend.
The chance for showers will continue into Tuesday evening until
daytime heating wanes and what appears to be the last shortwave
trough that pivots southeast through the western great lakes.
Expect mostly cloudy skies for the remainder of the night with
min temperatures in the lower 40s north (perhaps a couple upper
30s if clouds break), to the upper 40s east-central wi. A ridge of
high pressure is forecast to stretch from the mid-ms valley
northwest into south-central canada on Wednesday and send drier
air eastward into wi. This should bring mostly sunny skies and
warmer air into northeast wi, although a gusty west wind may
negate some of this warming. Nevertheless, MAX temperatures should
be able to reach the middle 60s north-central lakeshore, upper 60s
to around 70 degrees elsewhere (still a touch below normal).
The surface ridge axis shifts east Wednesday night and extend from
the tn valley northwest into the western great lakes region.
Mostly clear to partly cloudy skies with diminishing winds will
bring another somewhat cool night with min temperatures in the
lower to middle 40s north, upper 40s to around 50 degrees south.
The surface ridge is progged to weaken over the western great
lakes on Thursday, mainly due to one of those weak systems
dropping southeast in the northwest flow aloft. Most of the models|
focus the better precipitation chances across ia and il, however
cannot rule out the northern periphery of any shower activity from
reaching central east-central wi by Thursday afternoon. Will have
more clouds south than north, which would bring fairly uniform
temperatures to the forecast area. Look for MAX temperatures to be
in the upper 60s near lake mi, lower 70s north-central and lower
to middle 70s south.
It now appears that central east-central wi will reside on this
northern periphery of precipitation through Friday as a quasi-
stationary front to be located across southern sections of the
great lakes. This is one of those situations where a slight shift
north or south of 50 miles can spell the difference between partly
sunny skies no precipitation or mostly cloudy skies chance of
showers and thunderstorms. The latest trend is for enough dry air
on northeast winds will keep this front south and the bulk of
Thursday night Friday would be dry (but stay tuned!). Max
temperatures for Friday will range from the middle 60s lakeside,
around 70 degrees north and lower to middle 70s south.
Plenty of questions exist headed into next weekend, primarily
focused on the timing location of a surface low that is progged to
swing southeast ahead of a south-southeast moving shortwave
trough. The cmc has been optimistic with high pressure building
south into wi and keeping all precipitation to our west and south.
The ECMWF has pulled a 180 and gone from sweeping the surface low
associated cold front through wi on Saturday, to keeping this
system now similar to the cmc. Meanwhile, the GFS does bring the
low pres cold front through wi, but not until Sunday. Such a vast
array of possibilities, plus model run-to-run inconsistencies,
all point to a low confidence high uncertainty forecast for next
weekend. Have followed the consensus solution which keeps chance
pops in the forecast both days, but can see a need to lower pops
as we get closer to the weekend, especially if the GFS joins the
other models. Temperatures will cool to below normal levels with
maxes both Saturday and Sunday in the lower 60s near lake mi,
middle 60s north-central and upper 60s elsewhere.
Aviation For 06z TAF issuance
issued at 1122 pm cdt Sun may 28 2017
isolated showers andVFR conditions are expected across most
of the region overnight. TheVFR conditions should prevail over
most of northeast and east central wi through the TAF period, but
MVFR ceilings are expected to arrive over north central and
central wi late tonight into Monday morning. Showers will increase
in coverage during the late morning and afternoon on Monday, and
become numerous over north central wi later in the day. The
steadier rain may cause ceilings to drop to ifr at rhi during the
late afternoon and early evening.
Gusty west winds will develop by mid to late morning, and continue
into Monday evening before subsiding.
Issued at 335 am cdt Mon may 29 2017
southwest winds early this morning will turn westerly and gust to
near 25 knots later this morning and this afternoon behind a cold
front. Winds will subside to 10 to 20 knots during the evening
hours and continue into the overnight hours.
Grb watches warnings advisories
Short term... ..Kurimski
long term... ... Kallas
aviation... ... .Kieckbusch
marine... ... ... Kurimski
Weather Reporting StationsEDIT (on/off)  Help NOTE: Click on distance to see the station location on a map
|Stations||Dist||Age||Wind||Air Temp||Water Temp||Waves||Pressure||DewPt|
|KWNW3 - 9087069- Kewaunee, WI||1 mi||55 min||W 2.9 G 5.1||55°F||1004.6 hPa|
|MN4 - 9087088 - Menominee, MI||45 mi||55 min||SSW 8 G 9.9||1003.4 hPa|
Wind History for Kewaunee MET, WI(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|Manitowoc, Manitowoc County Airport, WI||23 mi||29 min||SW 6||10.00 mi||Mostly Cloudy||54°F||48°F||83%||1007.8 hPa|
Wind History from MTW (wind in knots)
|1 day ago||Calm||SE||E||SE||S||S||SE||S||S||S||SE||SE||S||Calm||S||S||SW||SW||W||Calm||Calm||Calm||W||Calm|
|2 days ago||Calm||SW||E||E||E||SE||SE||SE||S||S||SE||E||SE||SE||Calm||Calm||E||E||Calm||Calm||Calm||Calm||Calm||Calm|
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help
EDIT (on/off)  Help
Weather Map and Satellite Images(on/off)  Help
|Weather Map ||IR Satellite Image from GEOS|
GOES Local Image of GreatLakes EDIT
Wind Forecast for Green Bay, WI (7,2,3,4)(on/off)  Help
Ad by Google
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.