Saturday, July22, 2017 L-36.com


Marine Weather and Tides
Oshkosh, 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 5:31AMSunset 8:29PM Saturday July 22, 2017 3:38 PM CDT (20:38 UTC) Moonrise 4:42AMMoonset 7:52PM 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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LMZ543 Rock Island Passage To Sturgeon Bay Wi- Sturgeon Bay To Two Rivers Wi-two Rivers To Sheboygan Wi- 256 Pm Cdt Sat Jul 22 2017
Tonight..E wind 5 to 10 kts veering sw after midnight. Waves 2 ft or less. A chance of showers and Thunderstorms.
Sunday..NW wind 5 to 10 kts veering N 10 to 15 kts early in the afternoon. Waves 2 ft or less. A slight chance of showers and Thunderstorms.
Sunday night..N wind 15 to 25 kts. Waves 2 to 4 ft. Mostly cloudy. A small craft advisory may be needed.
Monday..NE wind 10 to 15 kts. Waves 1 to 3 ft. Partly cloudy in the morning then clearing.
LMZ543 Expires:201707230415;;662891 FZUS53 KGRB 221956 NSHGRB Nearshore Marine Forecast National Weather Service Green Bay WI 256 PM CDT Sat Jul 22 2017 For waters within five nautical miles of shore on Lake Michigan LMZ541>543-230415-

7 Day Forecast for Marine Location Near Oshkosh, WI
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location: 44.02, -88.56     debug


Area Discussion for - Green Bay, WI
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Fxus63 kgrb 221959
afdgrb
area forecast discussion
national weather service green bay wi
259 pm cdt Sat jul 22 2017
forecast discussion for routine afternoon forecast issuance

Short term Tonight and Sunday
issued at 259 pm cdt Sat jul 22 2017
chance for, and strength of, thunderstorms late this afternoon and
tonight are the main concerns in the short term.

Fog from early this morning dissipated and low clouds were
gradually breaking up throughout the day. This allowed instability
to increase across the area during the late morning and afternoon.

Mesoanalysis as of 19z had MUCAPE values generally in excess of
1000 j kg range across the western part of the forecast area and
cin values across north central wisconsin were 25 j kg or less.

Nothing had developed in the area or nearby as of 19z, but there
was no shortage of boundaries, with a stationary front along the
wisconsin illinois border, another across lake superior and upper
michigan, and a trough in eastern minnesota. Wind directions
varied considerably across the area but speeds were light,
resulting in weak convergence at several locations. Dew points
were generally in the mid 60s to around 70.

Models were showing the surface low near the minnesota manitoba
border passing north of the area and dragging a trough cold front
through the state as a 500mb trough moves across wisconsin with a
500mb low passing to the north of the state. These features
should be sufficient to get thunderstorms into the area later
today tonight. Latest versions of the hrrr and rap showed
development in northern wisconsin around 23z, just to the west of
the forecast area. Convection then moves into north central
wisconsin with a line developing to the southwest as it makes its
way across the rest of the area during the late evening nighttime
hours.

Spc day 1 convective outlook had most of the area in a slight
risk of severe with a marginal risk for door county and the rest
of the lakeshore due to "robust speed shear."
convection is forecast to exit the area overnight but there are
still some slight chance low end chance pops in the far east and
north in cyclonic flow around the departing system.

Long term Sunday night through Saturday
issued at 259 pm cdt Sat jul 22 2017
high pressure regimes will dominate much of the weather next week
with the exception of a frontal system with upper support from
Tuesday evening into Wednesday evening. Temperatures expected to
mostly be near seasonable levels.

Moist cyclonic flow with the departing deep upper trough or
nearly closed low may keep a few showers around Sunday evening
until daytime heating wanes. Clearing skies later Sunday night
with cooler overnight low temperatures in the 40s north to lower
and mid 50s central, may lead to fog formation by early Monday
morning. Otherwise a cool comfortable and drier air mass will
filter into the area for the start of new work week as a high
pressure system drifts into the western great lakes region.

Next chance for precipitation and possible strong to severe storms
during the Tuesday evening into Wednesday evening time frame. A
strong short wave trough, near the canadian pacific coast line
this Saturday afternoon as per water vapor loop, is progged to
drop over the great lakes region late Tuesday into Wednesday. The
850 warm air return and possibly the start of the convection
begins to reach north central wisconsin Tuesday afternoon and
evening. The short wave trough then drags a cold front across the
state on Wednesday, dropping the front south of the forecast area
later Wednesday evening.

Another high pressure system will then build into the area for
the remainder of the work week and perhaps remain settled over
the region into the start of next weekend.

Aviation For 18z TAF issuance
issued at 1238 pm cdt Sat jul 22 2017
areas of fog dissipated this morning and low clouds were slowly
breaking up too. Think that the low clouds will become scattered
this afternoon. Loss of the MVFR and lower endVFR ceilings will
allow the atmosphere to more easily destabilize during the
afternoon into early evening. Convective development is a concern
for later in the afternoon with increasing instability, an
abundance of boundaries, an approaching surface system, and a mid
level trough passing through wisconsin. The best chances for
storms look to be in the late afternoon early evening across north
central and central wisconsin, and late evening overnight farther
to the east. Expect MVFR or ifr conditions with thunderstorms and
some MVFR fog is likely later in the night. Should beVFR after
fog dissipates in the morning.

Grb watches warnings advisories
None.

Short term... ..Mg
long term... ... Tdh
aviation... ... .Mg


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SGNW3 - Sheboygan, WI 50 mi39 min ENE 2.9 G 2.9 69°F 1009.2 hPa (-0.5)67°F
PWAW3 - Port Washington, WI 57 mi59 min ESE 4.1 G 5.1 71°F 1010.5 hPa

Wind History for Kewaunee MET, WI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Wittman Regional Airport, WI1 mi46 minSE 510.00 miMostly Cloudy79°F69°F72%1008.2 hPa
Appleton-Outagamie, WI17 mi54 minVar 410.00 miMostly Cloudy81°F62°F54%1009.1 hPa
Fond Du Lac County Airport, WI18 mi46 minN 010.00 miMostly Cloudy81°F68°F65%1009.3 hPa

Wind History from OSH (wind in knots)
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Last 24hrS6S5S4S7S5S4CalmS7S8SE6SE4SE4SE4CalmE4SE4CalmNW4N6N4N5CalmNE6SE5
1 day agoN10NW8W4W4NW3CalmSW4W3CalmCalmCalmW4W4W6CalmS3SE3CalmS3S4SW5CalmSW3SW5
2 days agoE5E5E6SE4S9S13S23
G28
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W76W65NW3W6W44W7NW7W7NW11NW10

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 Green Bay, WI (16,3,4,5)
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Ground Weather Radar Station Green Bay, 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.