Monday, August21, 2017 L-36.com


Marine Weather and Tides
Shorewood, 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 6:02AMSunset 7:46PM Sunday August 20, 2017 11:20 PM CDT (04:20 UTC) Moonrise 4:38AMMoonset 7:12PM Illumination 1% Phase: Waning Crescent; Moon at 29 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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LMZ645 North Point Light To Wind Point Wi- 1106 Pm Cdt Sun Aug 20 2017
Rest of tonight..Southwest wind 5 to 10 knots. Chance of showers and Thunderstorms early in the morning. Waves around 1 foot.
Monday..South wind 5 to 10 knots rising to 10 to 15 knots late in the afternoon. Chance of showers and Thunderstorms in the morning, then slight chance of showers and Thunderstorms in the afternoon. Waves around 1 foot.
Monday night..South wind 10 to 15 knots veering west with gusts to around 20 knots after midnight. Showers likely and a chance of Thunderstorms. Waves 1 to 2 feet.
Tuesday..Northwest wind 10 to 15 knots. Gusts up to 20 knots. Chance of showers in the morning, then slight chance of showers in the afternoon. Waves 1 to 2 feet.
LMZ645 Expires:201708211000;;705237 FZUS53 KMKX 210406 NSHMKX Nearshore Marine Forecast National Weather Service MILWAUKEE/SULLIVAN WI 1106 PM CDT Sun Aug 20 2017 For waters within five nautical miles of shore on Lake Michigan LMZ645-211000-

7 Day Forecast for Marine Location Near Shorewood, WI
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location: 43.04, -87.9     debug


Area Discussion for - Milwaukee/Sullivan, WI
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Fxus63 kmkx 210226
afdmkx
area forecast discussion
national weather service milwaukee sullivan wi
926 pm cdt Sun aug 20 2017

Update Upstream convection that formed along weak boundary
already showing signs of weakening. Expect this trend to continue
as it progresses ese into central wi. Farther south, meso-scale
convective eddy continues to move east. Will need to keep an eye
on some new development in the wake of the eddy near krfd as it is
tracking ne. Otherwise, most of the night should remain dry with
the chance for a shower or storm increasing late tonight into
Monday morning as warm air advection and moisture advection
increases. Added fog to the forecast for the overnight as skies
will remain clear to partly cloudy for much of the period.

Dewpoints remain moist, from the mid 60s to low 70s. Especially
concerned about the sheboygan area where the dewpoint has remained
around 70 due to the moist marine layer which pushed inland
earlier due to the lake breeze.

Marine Onshore breezes will turn southwest overnight as land
areas cool. Weakening area of showers may affect near shore waters
Monday morning but most of the day should be dry. Winds will turn
back to the southeast during the day. More widespread showers and
storms still expected Monday night, with a few possibly reaching
severe levels.

Prev discussion (issued 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
Monday evening.

Prev discussion... (issued 208 pm cdt Sun aug 20 2017)
short term...

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
bit muggy.

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
afternoon.

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
tornado possibility.

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
limited.

Look for brisk northwest surface winds Tuesday.

Long term...

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 cap.

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.

Aviation(18z tafs)...

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.

Marine...

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
severe.

Mkx watches warnings advisories
Wi... None.

Lm... None.

Update... mbk


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MLWW3 - Milwaukee, WI 1 mi30 min WSW 4.1 G 5.1 75°F
45013 5 mi101 min S 1.9 G 3.9 71°F 70°F1017.3 hPa
PWAW3 - Port Washington, WI 24 mi40 min WSW 1.9 G 2.9 72°F 1017.6 hPa
KNSW3 - Kenosha, WI 32 mi80 min W 1.9 G 2.9 76°F 1016.6 hPa (+1.0)
WHRI2 - Waukegan Harbor, IL 47 mi40 min NE 5.1 G 7 75°F

Wind History for Holland, MI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Milwaukee, General Mitchell International Airport, WI6 mi28 minN 010.00 miA Few Clouds71°F66°F84%1016.6 hPa
Milwaukee-Timmerman, WI10 mi25 minN 010.00 miFair68°F60°F78%1017.6 hPa
Waukesha County Airport, WI16 mi45 minN 07.00 miFair66°F64°F94%1017.9 hPa
Racine, Batten International Airport, WI20 mi27 minNNW 38.00 miFair70°F66°F90%1017 hPa

Wind History from MKE (wind in knots)
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Last 24hrS5S4SW5CalmSW3S3SW4SW4S5S8SW9SW10SW10S8S6W6S6S8S6S4S4CalmSE4Calm
1 day agoW5NW7NW9NW5W4NW5W5NW5NW3NW5W4N3CalmNW76W6N6W6SW8SW6SW5SW4SW4SW4
2 days agoW13W11
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W10NW9NW12W11NW7W11NW12NW9
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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 Milwaukee/Sullivan, WI (0,6,7,8)
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Ground Weather Radar Station Milwaukee, WI
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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.