Sunday, July23, 2017 L-36.com


Marine Weather and Tides
Sheboygan, 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 5:29AMSunset 8:24PM Sunday July 23, 2017 3:51 AM CDT (08:51 UTC) Moonrise 5:45AMMoonset 8:35PM Illumination 0% Phase: New Moon; 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
    EDIT      (on/off)   Help
LMZ669 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 Am Cdt Sun Jul 23 2017 Sheboygan Wi To Pentwater Mi South...
Today..Variable winds around 10 kt becoming west 10 to 15 kt after Sunrise, then veering to north in the afternoon. Slight chance of showers and Thunderstorms. Waves 1 to 3 ft building to 2 to 4 ft late in the day.
Tonight..North winds 10 to 20 kt increasing to 15 to 25 kt after midnight. Waves 2 to 4 ft building to 3 to 5 ft.
Monday..North winds 15 to 25 kt diminishing to 10 to 20 kt in the afternoon. Waves 3 to 6 ft occasionally to 8 ft.
Monday night..Northeast winds 10 to 20 kt veering to southeast 10 to 15 kt. Waves subsiding to 2 to 4 ft.
Tuesday..Southeast winds 10 to 15 kt increasing to 10 to 20 kt. Waves 1 to 3 ft.
Tuesday night..Southeast winds 10 to 20 kt becoming south. Waves 1 to 3 ft.
Wednesday..South winds 10 to 20 kt. Waves 1 to 3 ft.
Thursday..North winds 10 to 20 kt increasing to 15 to 25 kt. Waves building to 3 to 5 ft.
LMZ669 Expires:201707231515;;688812 FZUS63 KLOT 230743 GLFLM OPEN LAKE FORECAST for Lake Michigan National Weather Service Chicago/Romeoville IL 243 AM CDT Sun Jul 23 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...Broad low pressure of 29.8 inches across Lake Michigan and lower Michigan will move southeast through today, with a trailing cold front moving south over the lake this afternoon and evening. This low pressure will move to the northeast by late Monday morning while high pressure of 30.1 inches builds over the Great Lakes. This high will persist through Tuesday before shifting east Tuesday night. Low pressure of 29.5 inches will then move east to James Bay by Wednesday. A trailing cold front will push south across the lake on Wednesday night before high pressure builds over the lake again for the end of the week. LMZ080-669-671-673-675-777-779-870-872-874-876-878-231515-

7 Day Forecast for Marine Location Near Sheboygan, WI
   Hourly   EDIT   Help
location: 43.71, -87.19     debug


Area Discussion for - Milwaukee/Sullivan, WI
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus63 kmkx 230837
afdmkx
area forecast discussion
national weather service milwaukee sullivan wi
337 am cdt Sun jul 23 2017

Short term
Today and tonight... Forecast confidence is medium.

Shortwave energy out ahead of a robust upper trough, upward motion
due to the right entrance region of an upper jet, the nose of an
850mb weak low level jet, and just enough moisture in the
700-800mb layer are allowing for scattered showers and
thunderstorms in areas of east central wi early this morning.

These will diminish as drier air moves in around 12z 7 am this
morning.

The next area to watch for potential showers and thunderstorms
later this morning is over south central wi. The hrrr and some
other mesoscale & synoptic models show some activity developing
along the surface cold front where there is just enough moisture
to allow for it. The forcing is also associated with the upper
trough.

These should remain confined to just south of the i-94 corridor
and there is only a brief window of opportunity that will
translate into southeast wi by early afternoon. If these storms
occur, CAPE and shear are on the weak to moderate side, so a few
stronger storms are possible, but probably sub-severe. They would
be fairly short-lived, so this is not a day to cancel plans. A
half inch would be possible under any strong storm, so we will
monitor this for a potential problem to flooded areas.

Long term
Monday and Tuesday Forecast confidence is high.

Light upper flow will prevail with mid-level ridging taking hold
across the western great lakes. Surface high pressure will
progress from near lake superior Monday morning towards lower
michigan Tuesday afternoon. North to northeasterly surface winds
on Monday will veer southerly on Tuesday with return flow behind
the departing surface high. This will advect a higher theta-e
airmass into southern wisconsin, with a subsequent increase in
both 850 925 mb temperatures and surface dewpoints. Any
precipitation during this time will remain confined well to our
northwest across the dakotas and minnesota in close proximity to
a surface cold front. Look for below normal temperatures on Monday
with onshore flow, followed by a warming trend towards normal on
Tuesday. It will feel more humid on Tuesday, as dewpoints climb
into the mid 60s west of madison.

Wednesday and Wednesday night Forecast confidence is medium.

The upper flow pattern becomes zonal and progressive, as an 80 to
90 knot speed MAX traverses the upper midwest and western great
lakes. A band of mid-level moisture and cyclonic vorticity
advection will progress through the region, reaching southern
wisconsin Wednesday afternoon and evening. The upper wave will
escort a surface cold front, which should arrive in our area
during the evening. Surface convergence along the front will serve
as a focus for showers and thunderstorms as it arrives. The pre-
frontal environment will be characterized by modest deep layer
shear around 25 knots, 1.5 to 2 kj kg of mlcape, and mid-level
lapse rates around 7 degrees per kilometer. This suggests some
potential for severe thunderstorms on Wednesday. We'll also need
to keep a close eye on rainfall, given multiple areas which are
particuarly vulnerable given recent flooding. While moisture
parameters are conducive to heavy rainfall, the steering flow
appears fairly progressive. This means that we should keep the
showers and storms moving along, which should hopefully minimize
the risk for additional flooding. Of course, this is still several
days out, so we'll need to watch for any changes. Keep up with
the forecast. It will feel pretty muggy on Wednesday with highs in
the 80s and dewpoints right around 70.

Thursday through Saturday Forecast confidence is medium.

High pressure will slowly migrate from the western great plains
into the lower great lakes, bringing quiet weather to the region.

The 23.00z GFS solution brings shower chances along a weak surface
trough on Saturday night, but this is not supported among the
other guidance at this time. Temperatures during this period will
be seasonal.

Aviation(06z tafs)
Patchy ground fog and associated low clouds will clear out quickly
by 8 or 9 am this morning. Storms in east central wi are expected
to move out by 12z 7 am. Otherwise, mid level clouds will clear
out this morning until a surface front reaches south central wi
by mid morning and southeast wi this afternoon. The front is weak
in terms of wind and temperature, but could kick up a few storms
south of madison and milwaukee today.

Marine
Light winds will prevail today. Then northeast winds will increase
from north to south this evening with a weak cold front. The wind
gusts are expected to remain below 22 knots and waves below 4
feet, so I did not issue a small craft advisory.

Mkx watches warnings advisories
Wi... None.

Lm... None.

Today tonight and aviation marine... Cronce
Monday through Saturday... Spm


Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SGNW3 - Sheboygan, WI 27 mi51 min E 11 G 11 67°F 1007.8 hPa (-0.7)67°F
45024 38 mi31 min SSW 12 G 16 69°F 69°F1 ft1009.6 hPa67°F
PWAW3 - Port Washington, WI 42 mi71 min NE 12 G 16 70°F 1009.5 hPa
LDTM4 - 9087023 - Ludington, MI 43 mi51 min S 6 G 8 66°F 65°F
BSBM4 - Big Sable Point, MI 43 mi71 min S 12 G 19 66°F 1008.8 hPa

Wind History for Ludington, MI
(wind in knots)    EDIT      (on/off)   Help
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
Last
24hr
E6
G9
E5
G8
E5
G8
E4
G7
E4
G7
E4
G7
E5
E4
G7
E4
E3
NW4
NW7
G10
NW7
W6
NW5
G10
NW5
NW2
NE1
SW1
S3
S5
NE3
SW1
G5
S6
1 day
ago
SW3
G6
SW7
G11
SW2
G6
SW2
S2
SW2
G5
W2
W2
SW1
G4
SW2
SW2
G8
SW3
SW2
G6
SW3
G6
S5
G8
S2
E3
E2
NE2
E4
SW5
G9
NE2
G5
SE4
G11
SW8
2 days
ago
SW5
G11
SW8
SW7
G17
SW5
G11
SW2
G5
SW2
G5
SW2
G5
SW2
W2
SW1
G4
SW1
G5
SW2
G6
SW2
G6
SW2
G5
W2
W2
SW1
SW1
SW3
G8
SW3
G6
S3
S3
SW4
G8
SW3
G7

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Sheboygan County Memorial Airport, WI35 mi58 minE 510.00 miOvercast67°F66°F100%1008.1 hPa

Wind History from SBM (wind in knots)
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
Last 24hrE4NE3NE4CalmNE3N4NE4NE5N54E4NE8E6NE6E5SE5SE3S4SW3S7CalmW6SE8E5
1 day agoCalmW3CalmCalmCalmCalmSE3CalmS7S8S10SW5SW4SE3S5SE3S5S6S5S5S9CalmCalmCalm
2 days agoSW8W4W5W4NW6NW9W6NW8W7NW6NW5NW7W8NW9W6NW3SW4CalmS3SW3CalmCalmCalmCalm

Tide / Current Tables for
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help
Tide / Current Tables for
   EDIT      (on/off)   Help
Weather Map and Satellite Images
       (on/off)   Help
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)
      (on/off)   Help

Ground Weather Radar Station Green Bay, WI
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

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.