Tuesday, August20, 2019 L-36.com

Marine Weather and Tides
Monona, WI

Version 3.4
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 6:07AMSunset 7:54PM Tuesday August 20, 2019 7:53 PM CDT (00:53 UTC) Moonrise 10:33PMMoonset 10:53AM Illumination 71% Phase: Waning Gibbous; Moon at 20 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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LMZ644 Port Washington To North Point Light Wi- 711 Pm Cdt Tue Aug 20 2019
Tonight..South wind 5 to 10 knots veering west early in the morning. Slight chance of showers and Thunderstorms after midnight. Waves around 1 foot.
Wednesday..Northwest wind 10 to 15 knots veering north with gusts to around 20 knots in the late morning and afternoon. Partly Sunny. Waves around 1 foot.
Wednesday night..North wind 5 to 10 knots backing northwest late in the evening, then becoming northwest 5 to 10 knots after midnight veering north early in the morning. Partly cloudy. Waves 1 to 2 feet.
Thursday..Northeast wind 5 to 10 knots rising to 10 to 15 knots late in the morning, then becoming northeast 10 to 15 knots in the afternoon. Mostly Sunny. Waves 1 to 2 feet.
LMZ644 Expires:201908210400;;956525 FZUS53 KMKX 210011 NSHMKX Nearshore Marine Forecast National Weather Service Milwaukee/Sullivan WI 711 PM CDT Tue Aug 20 2019 For waters within five nautical miles of shore on Lake Michigan LMZ644-210400-

7 Day Forecast for Marine Location Near Monona, WI
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location: 43.07, -89.32     debug

Area Discussion for - Milwaukee/Sullivan, WI
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Fxus63 kmkx 202257
area forecast discussion
national weather service milwaukee sullivan wi
557 pm cdt Tue aug 20 2019

No meaningful changes are needed to the forecast tonight. Our
focus is on the approaching cold front now located over central
wisconsin. It may help spark off some isolated showers or a
thunderstorms later this evening and overnight. It should be
pushing southeast of wisconsin right around 12z Wednesday. Light
winds, clear skies and the lingering high dewpoints could result
in some fog and or stratus again later tonight, but will clear out
quickly with the frontal passage Wednesday morning. The forecast
has all this handled well.

Aviation(00z tafs)
ExpectVFR conditions through the evening. A weak cold front is
approaching southern wisconsin from the north. It may help trigger
isolated showers and storms later this evening and overnight.

Also, light winds, mostly clear skies and humid conditions ahead
of the front may result in MVFR ifr CIGS vsbys developing between
about 09-13z Wednesday. These lower conditions will improve to
vfr levels quickly Wednesday morning as the front pushes off to
the southeast and drier air arrives on northwest winds. Winds will
turn northeast near lake michigan by late Wednesday morning. This
will impact mainly kmke kenw airports.

Prev discussion (issued 309 pm cdt Tue aug 20 2019)
short term...

tonight through Wednesday night... Forecast confidence is medium
to high...

the remnant MCV from the morning convective system that moved
through il has been slow to kick east and is now south of kenosha
co. Light rain on the northern side of this has been moving into
the southern portions of milwaukee co. But as we go through the
afternoon expect all of this precip to diminish as the circulation
weakens and pushes east. Outflow from an earlier line of storms is
moving into the madison area now and although there is an increase
in surface convergence, satellite imagery, especially low-level
water vapor imagery would suggest drier air is moving in behind
the outflow boundary. This is resulted in a clearing of clouds
over the western portions of the area. It's still possible that a
few parcels could get lifted along the boundary to tap into some
modest instability of 1,000-2,000 j kg. However, the dry air
entrainment will likely keep storms from developing. Can't rule
out an isolated storm but things are going to be hard pressed to

Overnight the cold front will be nearing the region and very
isolated showers storms are possible along the front. With mostly
clear skies the lingering low level moisture ahead of the boundary
should allow for fog formation again tonight for a period. The
winds picks up as the front moves through and this should help to
mix the fog out closer to sunrise.

Caa will be taking place for Wednesday and highs will stay in the
70s. The drier air and slight breezes behind the front will make
for a nice day. Lows Wednesday night into Thursday bottom out in
the lower 50s.

Long term...

Thursday through Sunday... Forecast confidence is high:
high pressure will keep it dry across southern wisconsin through
the remainder of the work week and into the weekend. There should
be plenty of sunshine during this period, with temps a few degrees
below normal Thu Fri warming back to around normal by Sunday.

Monday and Tuesday... Forecast confidence is medium to high:
southerly low level flow between departing high pressure and an
approaching low will bring warmer and more moist conditions to
southern wisconsin early next week. A chance for showers and
storms is likely to return as well, with some uncertainty as to
the timing of the better forcing and storm chances this far out.

Aviation(21z tafs)...

lingering light rain and isolated thunderstorms are possible until
00z for locations near the wi il border. Drier air in the low mid
levels will clear any low level cloud cover still hanging around.

Fog is expected to develop tonight after midnight but winds begin
to shift to the N NW closer to 12z. Gusty northerly winds are
expected for Wednesday behind the cold front.


an isolated shower or storm is possible as a front moves across
the area overnight. Ahead of the front though, lingering low level
moisture could result in some fog in the nearshore waters tonight.

Winds and waves increase behind the front on Wednesday with gusts
to 20 knots at times and waves between 1 to 3 feet in the
nearshore and 4 to 6 feet in the open waters. High pressure builds
in on Thursday resulting in lighter winds and lower waves for the
rest of the week.

Mkx watches warnings advisories
Wi... None.

Lm... None.

Update... Davis
tonight Wednesday and aviation marine... Davis
Wednesday night through Tuesday... Ddv

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PWAW3 - Port Washington, WI 80 mi74 min S 5.1 G 6 76°F 1013.9 hPa
KNSW3 - Kenosha, WI 87 mi54 min NNE 1 G 5.1 74°F 1012.9 hPa (-1.7)

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Madison, Dane County Regional-Truax Field, WI5 mi2 hrsS 910.00 miPartly Cloudy81°F68°F65%1012.2 hPa
Middleton Muni - Morey Field, WI12 mi99 minN 010.00 miPartly Cloudy81°F-7°F3%1013.5 hPa

Link to 5 minute data for KMSN

Wind History from MSN (wind in knots)
Last 24hrCalmCalmCalmCalmCalmCalmCalmCalmNE3CalmCalmSE3S4CalmNE3NE3SE11NE4N45SE9S7S9Calm
1 day agoCalmSW3SW4SW3CalmCalmCalmCalmCalmN4CalmCalmN4NE6NE444E6S44SE45CalmCalm
2 days agoS6S4S5SE5S5S6S8S7

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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GOES Local Image of    EDIT
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 Milwaukee/Sullivan, WI (20,4,5,8)
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Ground Weather Radar Station Milwaukee, WI
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weather_mapweather_map weather_map

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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.