Saturday, March25, 2017 L-36.com


Marine Weather and Tides
Twin Lakes, WI

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:44AMSunset 7:13PM Saturday March 25, 2017 10:44 AM CDT (15:44 UTC) Moonrise 5:32AMMoonset 4:36PM Illumination 4% Phase: Waning Crescent; Moon at 28 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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LMZ646 Port Washington To North Point Light Wi- North Point Light To Wind Point Wi- Wind Point Wi To Winthrop Harbor Il- 935 Am Cdt Sat Mar 25 2017
.small craft advisory in effect through Sunday morning...
Rest of today..Northeast wind 15 to 25 knots with gusts to around 30 knots. Patchy fog. Periods of rain. A slight chance of Thunderstorms in the afternoon. Waves 4 to 6 feet building to 5 to 7 feet in the afternoon.
Tonight..East wind 15 to 20 knots easing to 10 to 15 knots early in the morning. Gusts up to 25 knots in the evening. Areas of fog. Periods of rain. Waves 5 to 7 feet subsiding to 4 to 6 feet.
Sunday..East wind 10 to 15 knots diminishing to 5 to 10 knots in the afternoon. Areas of fog. Rain likely. Waves 3 to 4 feet.
Sunday night..North wind 5 to 10 knots backing northwest overnight. Patchy fog. Chance of rain. Waves 1 to 2 feet.
LMZ646 Expires:201703252215;;059611 FZUS53 KMKX 251435 NSHMKX NEARSHORE MARINE FORECAST NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 935 AM CDT SAT MAR 25 2017 FOR WATERS WITHIN FIVE NAUTICAL MILES OF SHORE ON LAKE MICHIGAN LMZ644>646-252215-

7 Day Forecast for Marine Location Near Twin Lakes, WI
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location: 42.52, -88.26     debug


Area Discussion for - Milwaukee/Sullivan, WI
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Fxus63 kmkx 251453 aaa
afdmkx
area forecast discussion... Updated
national weather service milwaukee/sullivan wi
953 am cdt Sat mar 25 2017

Update
Periods of rain will continue today on brisk east winds. This is
in response to low pressure tracking through missouri and central
illinois today. There is very weak instability in northern il that
will clip southeast wi this afternoon, so kept the mention of
thunder for that area.

There should be a lull in the showers this evening, then another
round of showers is expected late tonight into Sunday morning.

Marine
Brisk northeast to east winds today, then diminishing as the
surface low approaches Sunday morning. Small craft advisory
in effect through tonight as waves will be slow to subside below
4 feet.

Prev discussion (issued 734 am cdt Sat mar 25 2017)
update...

aviation(12z tafs)...

ifr/lifr ceilings expected through tonight. Will probably see
some lower visibilities form as the surface boundary creeps back
north into northern illinois later tonight into Saturday as low
pressure moves toward southeast wisconsin from missouri. Rain
will increase in coverage from the south into this afternoon.

Prev discussion... (issued 302 am cdt Sat mar 25 2017)
short term...

today and tonight... Forecast confidence... Medium
we will be on the cold side of the surface boundary with a strong
low level inversion. There is very weak elevated instability at
times, mainly 20 joules/kg or less. As the mid/upper low moves into
the mid mississippi river valley. The low/mid level jet points into
northern il, and expect most of the precipitation to fall this
afternoon. Far southeast wisconsin will have a very small chance of
elevated thunderstorms, with CAPE reaching a minimal 20 joules/kg.

Southeast wi will see higher amounts of rain than areas toward
central wi tonight into Saturday, ranging from around a third of an
inch northwest areas to up to an inch southeast. Rivers are forecast
to rise, with a few reaching bankfull stage, but so far we are not
forecasting rivers to reach flood stage this weekend.

Sunday and Monday... Forecast confidence is medium.

This period will be characterized by weak cyclonic flow throughout
the depth of the atmosphere, with abundant moisture in the low
levels. The deep, cut off low that has been spinning over the
southern plains will finally push through the upper midwest on
Sunday. The GFS brings this low the closest to southern wi, passing
just to our se. A second, weaker trough is progged to follow the
cutoff low on Monday, through there is some disagreement on the
intensity and placement of this trof. It looks like the GFS solution
again would be the most impactful for us, with the strongest and
closest cva, though even then, it looks pretty weak. Not a ton of
jet level divergence due to the weak flow, but generally diffluent
flow with the trough passages should provide some support for
lift.

In the lower levels, good agreement that a weak low will pass
through southeastern wisconsin on Sunday. Plenty of moisture from
700mb on down, weak WAA at 850 and 925, and even some weak
frontogenesis to the NW of the flow and again along the trailing
trof at 925 should provide enough of lift to support likely pops
though Sunday. After the first low passes, another even weaker low
passes to the southeast of the area on Monday. As with the upper
levels, the GFS brings this second low is the closest to our area.

The lowest levels remain saturated though Monday, so given the weak
support for ascent, will carry slight chance pops through the
day. However the GFS is the only model bringing any precip to our
cwa, so this may be dropped at some point.

Given the very marginal nature of the lift on both days, am not
expecting any widespread or intense precip. It will more likely be a
spotty, light precip on both days. Additionally, with the very weak
flow and abundant low level moisture prevailing through the period,
am expecting fog for the end of the weekend and beginning of next
week.

Long term...

Tuesday and Wednesday... Confidence is low
zonal flow aloft and high pressure in the lower levels will prevail,
so not much impactful weather expected. Looks like the lowest levels
will finally begin to dry out on Tuesday, so we'll have our first
good chance of seeing the Sun perhaps as early as Tuesday afternoon,
and likely on Wednesday.

Gfs is showing much stronger CAA behind Monday's potential low
pressure system, which is unsurprising since the GFS brings that low
so much closer to wi than the other models. Accordingly, temps
are dramatically cooler in the GFS than the euro/canadian.

Additionally, northerly flow on Tuesday will swing around to
easterly as the high slides over southern wi, so will have to
adjust temperatures downward along lake michigan, especially
Wednesday.

Wednesday night through Saturday... Confidence is low
the consensus train falls off the tracks for the end of the week.

All guidance does show another deep closed low develop in the desert
southwest in the middle of the week, moving toward the upper
midwest by the end of the week. However, the GFS also brings a
sharp trof down from canada as the cut off low moves toward
wisconsin. This northern stream trof will shunt much of the
moisture associated with the cutoff low south of the area.

Meanwhile, the euro and canadian show a much weaker northern
stream trof pushing well north of the area. This would allow the
cut off low and much of the associated moisture to move into the
area. Unfortunately, discrepancies in the temperature forecasts
persist into the late week. The ecmwf/canadian solution shows
temps getting quite cool as the low moves into the area and pulls
cool air into the region. The GFS keeps the temperatures warmer
because the low never actually makes it near the state. What that
means is the blended guidance is somewhere between the two most
likely scenarios, and is therefore likely wrong. However, with no
clear signal as to which solution is correct, will continue to
split the difference and reevaluate in the coming days.

Fortunately, if precip were to happen in this period, it looks
like it will be warm enough that it would nearly all be liquid.

Aviation(06z tafs)...

showers are beginning to fill in more from the south and will
continue to do so overnight into Saturday morning. Showers will
then hang on through the day most places. Low clouds are expected
through tomorrow. Will probably see some lower visibilities form
as the front creeps back north into northern illinois later
tonight into Saturday.

Marine...

rather brisk northeast to east winds through today, then
diminishing as the surface low approaches Sunday morning. With
persistent east winds, will extend small craft advisory through
tonight as waves will be slow to subside below 4 feet.

Mkx watches/warnings/advisories
Wi... None.

Lm... Small craft advisory until 7 am cdt Sunday for lmz643>646.

Update... Cronce
today/tonight and aviation/marine... Hentz
Sunday through Friday... Bsh


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KNSW3 - Kenosha, WI 24 mi45 min NNE 18 G 20 38°F 1019.3 hPa (+0.3)
WHRI2 - Waukegan Harbor, IL 26 mi65 min NNE 17 G 20
MLWW3 - Milwaukee, WI 41 mi35 min NNE 17 G 18 37°F

Wind History for Calumet Harbor, IL
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Burlington Municipal Airport, WI12 mi70 minNE 12 G 197.00 miUnknown Precip41°F41°F100%1019 hPa
Kenosha, Kenosha Regional Airport, WI18 mi52 minNE 19 G 2410.00 miOvercast and Breezy39°F37°F93%1020 hPa
Chicago/Waukegan Regional Airport, IL22 mi50 minNE 13 G 206.00 miFog/Mist38°F37°F100%1019.6 hPa

Wind History from BUU (wind in knots)
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1 day agoSE11
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2 days agoE8NE7E5E11
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E4E7E8E7E9SE6SE6CalmCalmCalmCalmCalmCalmCalmS3SE5SE6SE6SE6SE9
G17

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 Midwest    EDIT
Geos

Wind Forecast for Milwaukee/Sullivan, WI (11,2,3,4)
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Ground Weather Radar Station Milwaukee, 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.