Thursday, March23, 2017 L-36.com


Marine Weather and Tides
Westfield, 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 6:53AMSunset 7:17PM Thursday March 23, 2017 3:21 AM CDT (08:21 UTC) Moonrise 4:23AMMoonset 2:30PM Illumination 19% Phase: Waning Crescent; Moon at 25 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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LMZ643 Sheboygan To Port Washington Wi- 303 Am Cdt Thu Mar 23 2017
.small craft advisory in effect from 10 am cdt this morning through late tonight...
Today..South to southeast wind 10 to 20 knots becoming 15 to 25 knots in the afternoon. Mostly cloudy. Waves 3 to 5 feet building to 4 to 7 feet.
Tonight..South wind 15 to 20 knots with gusts to around 25 knots becoming 10 to 20 knots after midnight, then becoming 10 to 15 knots early in the morning. Chance of showers and slight chance of Thunderstorms through around midnight, then chance of rain after midnight. Waves 4 to 6 feet subsiding to 2 to 4 feet after midnight.
Friday..Southwest wind 5 to 10 knots veering west early in the afternoon, then becoming north 10 to 15 knots late in the afternoon. Chance of rain. Waves 1 to 3 feet.
Friday night..Northeast wind 10 to 15 knots rising to 15 to 20 knots in the late evening and overnight. Rain. Waves 3 to 4 feet.
LMZ643 Expires:201703231630;;939737 FZUS53 KMKX 230803 NSHMKX NEARSHORE MARINE FORECAST NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 303 AM CDT THU MAR 23 2017 FOR WATERS WITHIN FIVE NAUTICAL MILES OF SHORE ON LAKE MICHIGAN LMZ643-231630-

7 Day Forecast for Marine Location Near Westfield, WI
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location: 43.93, -89.43     debug


Area Discussion for - Milwaukee/Sullivan, WI
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Fxus63 kmkx 230450
afdmkx
area forecast discussion
national weather service milwaukee/sullivan wi
1150 pm cdt Wed mar 22 2017

Aviation(06z tafs)
Vfr conditions expected to persist through Thursday as a ridge of
high pressure drifts east through the great lakes. Winds will be
gusty out of the south through the day on into the evening before
a stationary front sets up across central wisconsin. Conditions
mainly look to be dry through Thursday evening as well.

Prev discussion... (issued 645 pm cdt Wed mar 22 2017)

Evening update
Mid-level ridge axis is to our west this evening, with warm
advection clouds bringing some light returns to area radars over
minnesota and iowa. Most of this precipitation isn't reaching the
ground, owing to the very dry airmass in the lower levels. Area
forecast soundings suggest this dry layer remaining in place
around 850 mb, so feel comfortable keeping pops out of the
forecast for the evening. It's not impossible we could see a few
flurries later tonight however.

Return flow sets up late tonight towards morning as surface high
pressure slides off to our east. Our coldest temperatures should
be realized early tonight, as warm advection and increased cloud
cover allow temperatures to hold steady or even rise a bit towards
morning.

Top down saturation is expected on Thursday, with rain chances
beginning during the afternoon to early evening hours. Models
still suggest around 200-300 joules of MUCAPE available, so
isolated thunderstorms remain possible during the afternoon and
evening.

Prev discussion... (issued 336 pm cdt Wed mar 22 2017)
tonight and Thursday... Forecast confidence is high.

High pressure will gradually lose its grip on the region a cyclone
slowly develops in the lee of the rockies. In the upper levels, a
large ridge will build in with a few embedded shortwaves passing
over the region on Thursday. Closer to the surface, the warm front
extending from the lee cyclone will reach well to the north of
southern wi, planting us firmly within an area of waa. Mid clouds
within the WAA currently over mn/ia will continue to push east,
reaching southern wi this evening, with the lower levels gradually
saturating through the night and into tomorrow.

Good agreement that the lowest levels will not saturate until after
at least 18z Thursday, so pulled back on the pops tomorrow. Precip
will become more likely on Thursday afternoon as the lower levels
saturate. Most guidance does show at least some instability building
in tomorrow afternoon, so included a mention of thunder.

In the near term, do have some concerns regarding the isolated
showers embedded in the upstream clouds extending from NW mn into
north central ia. The echoes from these showers are more expansive
than what the meso models are showing, and based off of CIGS within
the showers, it appears that moisture is extending lower than the
synoptic models would indicate. Fortunately, dewpoint depressions
over the area are currently around 20 degrees, and the southern end
of the showers does appear to be eroding as is pushes east.

Accordingly, will leave precip chances out of tonight's forecast,
but they may need to be added later.

Thursday night through Sunday... Confidence remains high.

For Thursday night and Friday, a surface warm front will push to
just north of our forecast area Thursday night then stall
briefly... The h8 boundary will be over far northern wisconsin on
Friday. So, the focus for the higher rainfall numbers will likely
be between these two features, or central wisconsin. This will
also allow 925mb temps to MAX out around 10-13c across far
southern wisconsin, potentially pushing surface temps into the
upper 60s. If we get any decent sunshine along the stateline, we
could even see a few 70s reported.

The front will then get suppressed south Friday night and Saturday
as building high pressure across southern canada increases the
northeast winds over the western great lakes, bringing a surge of
colder air south (with a lot of help from the cold waters of lake
michigan and superior).

As the surface front sags south into southern wisconsin, so will
the focus for on and off showers. A deep, closed and stacked low
pressure system will track from missouri Friday night, to northern
indiana by Sunday night. That slow track will keep it wet across
the area into Sunday. These closed and occluded lows are very
unpredictable with respect to resolving the smaller scaled rain
bands that will rotate around it. Especially as the system weakens
late in the weekend and becomes wrapped with dry air. At this
point it's best to only say it will be wet from time to time over
the Friday through Sunday time period. The higher chance for rain
is in the Friday night through Saturday period across southern
wisconsin.

Monday... Forecast confidence is medium.

A second low pressure system will be following quickly on the
heals of the first one, but passing much farther south. At this
point it looks like we could have some isolated showers around,
but nothing really organized as drier air will be working in.

Tuesday and Wednesday... Forecast confidence is medium.

High pressure should return this period providing dry conditions
with temps hovering close to normal for late march.

Marine...

brisk southerly winds and building waves are expected on Thursday
as the pressure gradient strengthens. A small craft advisory is
in effect from Thursday morning through the evening hours.

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

Lm... Small craft advisory from 10 am to 7 pm cdt Thursday for lmz645-
646.

Small craft advisory from 10 am Thursday to 1 am cdt Friday for
lmz643-644.

Update... Halbach
tonight/Thursday and aviation/marine... Bsh
Thursday night through Wednesday... Davis


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PWAW3 - Port Washington, WI 91 mi41 min SSE 9.9 G 14 33°F 1031.8 hPa
SGNW3 - Sheboygan, WI 93 mi81 min SE 13 G 14 30°F 1032.1 hPa (-1.3)21°F

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Wautoma, Wautoma Municipal Airport, WI10 mi25 minSE 510.00 miOvercast26°F19°F78%1032.8 hPa

Wind History from Y50 (wind in knots)
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Last 24hrCalmCalm--CalmNE5NE8E9--CalmE7CalmE6SE9SE10SE6SE7SE3CalmE4SE7E6E4SE4SE5
1 day agoNW7NW6NW5W6NW6NW9NW14
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2 days agoCalmCalmCalmCalmCalmCalm3N10N11N11N11
G17
N11NE10NE6NE4NW4CalmCalmCalmCalmCalmW3W5W6

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 (4,6,7,8)
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Ground Weather Radar Station Green Bay, 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.