Marine Weather and Tides
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 6:02AM||Sunset 7:45PM||Sunday August 20, 2017 8:00 PM CDT (01:00 UTC)||Moonrise 4:35AM||Moonset 7:08PM||Illumination 2%|
EDIT (on/off)  Help
|LMZ673 Lake Michigan From Michigan City In To St. Joseph Mi 5 Nm Offshore To Mid Lake- Lake Michigan From Sheboygan To Port Washington Wi 5 Nm Offshore To Mid Lake- Lake Michigan From Port Washington To North Point Light Wi 5 Nm Offshore To Mid Lake- Lake Michigan From North Point Light To Wind Point Wi 5 Nm Offshore To Mid Lake- Lake Michigan From Wind Point Wi To Winthrop Harbor Il 5 Nm Offshore To Mid Lake- Lake Michigan From Winthrop Harbor To Wilmette Harbor Il 5 Nm Offshore To Mid Lake- Lake Michigan From Wilmette Harbor Il To Michigan City In 5 Nm Offshore To Mid Lake- Lake Michigan From Whitehall To Pentwater Mi 5 Nm Offshore To Mid Lake- Lake Michigan From Grand Haven To Whitehall Mi 5 Nm Offshore To Mid Lake- Lake Michigan From Holland To Grand Haven Mi 5 Nm Offshore To Mid Lake- Lake Michigan From South Haven To Holland Mi 5 Nm Offshore To Mid Lake- Lake Michigan From St. Joseph To South Haven Mi 5 Nm Offshore To Mid Lake- 243 Pm Cdt Sun Aug 20 2017 Sheboygan Wi To Pentwater Mi South... |
Tonight..South winds 10 to 20 kt. Slight chance of showers and Thunderstorms. Waves 2 to 4 ft subsiding to 1 to 3 ft.
Monday..South winds 10 to 15 kt. Chance of showers and Thunderstorms in the morning...then slight chance of showers and Thunderstorms in the afternoon. Waves 1 to 3 ft.
Monday night..South winds 10 to 20 kt becoming southwest 15 to 25 kt. Showers and Thunderstorms likely. Waves 2 to 4 ft.
Tuesday..West winds 10 to 20 kt becoming northwest 15 to 25 kt. Chance of showers and Thunderstorms in the morning. Waves 3 to 5 ft.
Tuesday night..Northwest winds 15 to 25 kt diminishing to 10 to 20 kt. Waves 3 to 5 ft.
Wednesday..Northwest winds 10 to 20 kt becoming north. Waves 3 to 5 ft.
Wednesday night..North winds 10 to 20 kt becoming northeast. Waves 2 to 4 ft.
Thursday..Northeast winds 10 to 15 kt. Waves 1 to 3 ft.
Friday..Southeast winds 10 to 15 kt. Waves 1 to 2 ft.
|LMZ673 Expires:201708210315;;687174 FZUS63 KLOT 201943 GLFLM OPEN LAKE FORECAST for Lake Michigan National Weather Service Chicago/Romeoville IL 243 PM CDT Sun Aug 20 2017 FOR WATERS BEYOND FIVE NAUTICAL MILES OF SHORE ON Lake Michigan. Waves are provided as a range of significant wave heights, which is the average of the highest 1/3 of the wave, along with the average height of the highest 10% of the waves which will occasionally be encountered. .SYNOPSIS...A cold frontal trough, averaging 30.0 inches, will settle across the northern Lakes tonight before becoming nearly stationary. An area of low pressure of 29.6 inches will develop along the front over the northern Lakes Monday night, and will move east into far southwestern Ontario early Tuesday while the cold front pushes southeast across Lake Michigan. The low will then deepen to 29.4 inches over southern Quebec Tuesday evening while the front continues through the Ohio Valley. Expansive high pressure of 30.1 inches will spread from the Canadian prairies to the western Lakes Wednesday night, and will linger through the end of the week. LMZ080-669-671-673-675-777-779-870-872-874-876-878-210315-|
7 Day Forecast for Marine Location Near Wind Point, WIHourly EDIT Help
Area Discussion for - Milwaukee/Sullivan, WI  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxus63 kmkx 202336|
area forecast discussion
national weather service milwaukee sullivan wi
636 pm cdt Sun aug 20 2017
Update Meso-scale convective eddy continues to move east across
northern il. Few light showers may skim far southeast in next hour
or so. Otherwise, the rest of the evening should be dry.
Convergence very weak along boundary located across northwest
wisconsin and little resultant development despite MUCAPE around
3k joules. Will keep small chances after midnight due to
increasing upstream warm air advection, but latest mesoscale
models delaying showers and storms until very late tonight into
Monday morning. May be able to decrease more pops with late
evening update more clearing will likely result in a greater
threat of fog development overnight. Will see how the upstream
cloud cover develops this evening before adding patchy fog.
Aviation(00z tafs) Scattered showers and storms may hold off
until very late tonight into Monday morning. Hence less cloud
cover will result in a better chance for fog development
overnight. May add fog to late evening update. Forecast soundings
not showing much low level moisture so not thinking any late night
stratus at this point. Best chance for showers and storms still
Prev discussion (issued 208 pm cdt Sun aug 20 2017)
tonight and Monday... Forecast confidence is medium.
The mesoscale convective vortex responsible for showers across far
southern wisconsin today will continue drifting east across
northern illinois this evening, taking any remaining showers away
with it. The persistent high clouds over southern wisconsin should
thin towards evening as this feature departs. Scattered showers
and thunderstorms along a surface trough in northwest wisconsin
should sink into central wisconsin this evening. Most guidance
keeps these storms north of our area, but it's not impossible that
one of these could brush our northern counties.
The convective allowing models are in agreement in developing
thunderstorms after midnight across northwest iowa in association
with a push of warm moist advection arriving via the nocturnal
low-level jet. This guidance then steers the resulting
thunderstorm complex east-southeast into far southern wisconsin
and or northern illinois by early Monday morning. A few of these
storms could be strong as the reach western portions of the area,
but the low-level jet will be veering by this time, with the
complex likely weakening by mid morning as it pushes into
southeast wisconsin and northeast illinois. This will likely set
up a boundary which will be traversed by additional convection
Monday evening into Monday night.
We should be quiet for a time for early to mid afternoon thanks to
subsidence following the morning storms. The eclipse viewing
forecast remains rather murky, with odds favoring mostly cloudy
skies during the event. Temperatures during viewing time should be
in the mid to upper 70s, with dewpoints around 70 making it feel a
Monday night and Tuesday... Forecast confidence is high.
The zonal flow becomes southwest Monday night ahead of a strong
shortwave across south central canada that will push into the
upper great lakes Tuesday. Southern wisconsin will be in the
right entrance region of the 125 knot 250 mb jet just ahead of the
trough axis. Moderate upper divergence and 700 mb upward motion
until just after sunrise Tuesday, when they weaken.
A 850 mb thermal ridge will extend across southern wisconsin
Monday night giving way to strong cold air advection by Tuesday
A surface trough warm front will be near southern wisconsin
Monday night before a strong cold front exits Tuesday morning. Dew
points will be near 70 ahead of the front, with precipitable water
values around 1.75 inches. Main issue is the location of the
boundary. The hrrr experimental has a morning MCS moving across
northern illinois southern wisconsin. This would keep the most
unstable air farther south.
Gfs soundings support the SPC slight risk of severe, with zero to
1 km mixed later CAPE of 1700 joules kg early Monday evening, with
zero to 1 km shear around 24 knots and zero to 1 km SRH values of
160 m2 s2. While large hail and damaging winds are the primary
threat, there is enough low level veering winds shear for a small
Thunderstorms are expected Monday evening and into much of the
night, with showers ending Tuesday morning. The location of the
initial surface boundary will play the main role in severe
potential. If the hrrr plays out the severe potential would be
Look for brisk northwest surface winds Tuesday.
Wednesday through Sunday... Forecast confidence is high.
A large mid upper level trough is expected over southeast canada
and the eastern great lakes Wednesday. There is some weak CAPE Wednesday
afternoon, but there is a rather strong cap and very dry air above
The upper trough slowly reaches the northeast u.S. Thursday
night. Strong upper level northwest flow is expected into
Thursday, before the eastern u.S. Canadian trough weaken. The
upper flow over wisconsin then becomes more zonal later Thursday.
A weak shortwave moves into wisconsin Saturday and Sunday.
The cool north wind should diminish Wednesday, with high pressure
and cooler air Thursday and Friday. The high is expected to be
over the eastern great lakes Saturday, with weak warm advection on
the back side of the high.
prevailingVFR expected through early tonight. Rain showers will
affect areas mainly south of milwaukee and madison through the
afternoon. Shower and thunderstorm chances increase late tonight
into early tomorrow morning, followed by additional thunderstorm
chances Monday evening and night. Some of the storms Monday night
may be severe. Some brief ceiling and visibility reductions are
possible later tonight in and near showers and thunderstorms.
southerly winds of 10 to 20 knots will continue this evening,
with the highest winds and waves generally north of port
washington. Winds and waves should remain below small craft
advisory levels for much of next week. Showers and thunderstorms
are possible tonight into Monday morning, and again from Monday
evening into Tuesday morning. Some of the thunderstorms could be
Mkx watches warnings advisories
tonight Monday and aviation marine... 99
Monday night through Sunday... 99
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|
|45007 - S MICHIGAN 43NM East Southeast of Milwaukee, WI||13 mi||71 min||ESE 7.8 G 7.8||74°F||72°F||1 ft||1016.1 hPa (-0.5)|
|KNSW3 - Kenosha, WI||42 mi||61 min||SSE 4.1 G 6||75°F||1015.6 hPa (-0.3)|
|45029||43 mi||21 min||S 3.9 G 3.9||74°F||73°F||1 ft||1016.4 hPa||67°F|
|MLWW3 - Milwaukee, WI||44 mi||41 min||S 5.1 G 6||77°F|
|45013||44 mi||82 min||S 7.8 G 9.7||72°F||69°F||1016.2 hPa|
|45161||45 mi||41 min||S 5.8 G 5.8||73°F||72°F||1016.6 hPa|
|HLNM4 - 9087031 - Holland, MI||47 mi||43 min||SE 1.9 G 2.9||77°F||1016.2 hPa|
|MKGM4 - Muskegon, MI||47 mi||31 min||S 8.9 G 8.9||75°F||1016.2 hPa||66°F|
Wind History for Holland, MI(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|Racine, Batten International Airport, WI||39 mi||68 min||S 5||10.00 mi||Fair||77°F||66°F||71%||1016.3 hPa|
Wind History from RAC (wind in knots)
|1 day ago||W||W||W||W||W||W||W||W||NW||NW||NW||NW||Calm||Calm||E||NW||W||Calm||W||NW||S||S||S||S|
|2 days ago||W||W||W|
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 Milwaukee/Sullivan, WI (21,6,7,8)(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.