Thursday, September21, 2017 L-36.com


Marine Weather and Tides
Waukegan, IL

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 6:37AMSunset 6:50PM Thursday September 21, 2017 8:53 AM CDT (13:53 UTC) Moonrise 7:57AMMoonset 7:55PM Illumination 1% Phase: New Moon; Moon at 1 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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LMZ740 Winthrop Harbor To Wilmette Harbor- Wilmette Harbor To Northerly Island- Northerly Island To Calumet Harbor- 325 Am Cdt Thu Sep 21 2017
Today..South winds 5 to 10 kt becoming southeast around 10 kt in the afternoon. Patchy fog in the morning. Waves 1 ft or less.
Tonight..South winds 10 to 15 kt. Mostly clear. Waves 1 ft or less.
Friday..South winds 10 to 15 kt becoming southeast in the afternoon. Sunny. Waves 1 ft or less.
Friday night..South winds 10 to 15 kt. Mostly clear. Waves 1 ft or less.
LMZ740 Expires:201709211600;;703990 FZUS53 KLOT 210825 NSHLOT NEARSHORE MARINE FORECAST National Weather Service Chicago/Romeoville IL 325 AM CDT Thu Sep 21 2017 For waters within 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 waves, along with the average height of the highest 10 percent of the waves which will occasionally be encountered. LMZ740>742-211600-

7 Day Forecast for Marine Location Near Waukegan, IL
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location: 42.37, -87.8     debug


Area Discussion for - Chicago, IL
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Fxus63 klot 211130
afdlot
area forecast discussion
national weather service chicago romeoville, il
630 am cdt Thu sep 21 2017

Short term
244 am cdt
through tonight...

a few festering showers will continue early this morning near the
i-39 corridor ahead of a weakening cold front as it encroaches on
an expansive ridge centered along the appalachians. Overnight
satellite imagery shows convection back-building across iowa with
diminishing chances for thunders across the local cwa. Hi-res
models are in good agreement on precipitation ending around or
shortly after daybreak today.

Meanwhile, an upper low is digging across the pacific northwest
this morning and will approach the intermountain west this
evening. In response, southwest flow will increase across the
great plains and mississippi valley today lifting a warm front
into the far upper midwest which should be the focus for
convection today. This leaves the local area well entrenched in
the warm sector and capped by around +20c 850mb temps. Assuming
the broad cirrus shield this morning is able to clear out, this
should leave the area under partly cloudy to mostly sunny skies
this afternoon which will contribute to another day of
temperatures well into the 80s and low 90s. Record high
temperatures today are 92f for chicago and 94f for rockford, the
former having the best chance of being tied or broken today.

Dewpoints in the mid to upper 60s today will result in heat
indices in the upper 90s to around 100f this afternoon.

Deubelbeiss

Long term
244 am cdt
Friday through Wednesday...

large blocking high will be in place over the eastern half of the
u.S. Friday through the middle of next week resulting in a stretch
of above normal temperatures and primarily dry conditions. Friday
and Saturday in particular look very warm with record or near
record highs possible. Record highs for september 22nd are 92f for
chicago and 93f for rockford. Record highs for september 23rd are
91f for chicago and 92f for rockford. In addition, dewpoints in
the mid to upper 60s these days will make for continued muggy
conditions.

Upper ridge axis shifts slightly farther east Monday and Tuesday.

Temperatures remain well above normal this time frame, but should
be tempered some as the air mass modifies and cloud cover
increases from upstream convection. GFS indicates the potential
for showers and thunderstorms Monday afternoon due in part to
steep low level lapse rates. Not ready to bite off on this though
as forcing is minimal and forecast soundings show overall weak
instability due to poor mid and upper level lapse rates and some
capping from the 700-800mb warm nose. Meanwhile, ECMWF maintains
a dry forecast on Monday.

Gfs and ECMWF remain in reasonable agreement that the strong upper
ridge will begin to breakdown late Tuesday or Wednesday allowing
a cold front to sweep across the local area. This looks to be the
next decent shot for showers and thunderstorms and temperatures
will moderate behind the front closer to seasonal norms.

Deubelbeiss

Aviation
For the 12z tafs...

convection continues to dissipate as it encounters more stable
air over il. No additional rain is expected at any of the taf
sites. Looking at southerly winds andVFR conditions through
Friday morning. Cloud cover may linger longer than currently
forecast, but it will beVFR.

Jee

Marine
244 am cdt
a cold front will move over central lake michigan today and then
lift north as a warm front tonight. Wind direction will vary on
either side of the cold front, but southerly winds follow the warm
front. A blocky pattern then sets up and remains in place through
early next week. A high pressure ridge will sit over the eastern
u.S. While a low pressure trough extending from the northern
mississippi valley to the southern plains remains stationary as it
weakens. This pattern will produce southerly winds through
Tuesday. While guidance differs on how the pattern breaks, the
models agree that winds will shift to northwest Wednesday.

Jee

Lot watches warnings advisories
Il... None.

In... None.

Lm... None.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WHRI2 - Waukegan Harbor, IL 1 mi74 min ESE 2.9 G 2.9 74°F
KNSW3 - Kenosha, WI 15 mi54 min SSE 1.9 G 2.9 72°F 1015.6 hPa (+1.4)
45174 18 mi54 min S 5.8 G 7.8 71°F 70°F1 ft70°F
FSTI2 28 mi114 min SSW 7 76°F
OKSI2 33 mi114 min W 2.9 79°F
CHII2 - Chicago, IL 34 mi64 min S 11 G 11 75°F 69°F
JAKI2 42 mi114 min WSW 6 77°F
CMTI2 - 9087044 - Calumet, IL 46 mi66 min SW 4.1 G 8 74°F 1015.6 hPa70°F
45007 - S MICHIGAN 43NM East Southeast of Milwaukee, WI 46 mi64 min S 9.7 G 9.7 71°F 69°F1 ft1015.4 hPa (+1.3)
MLWW3 - Milwaukee, WI 47 mi64 min NNE 8 G 8.9 69°F

Wind History for Calumet Harbor, IL
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago/Waukegan Regional Airport, IL5 mi59 minSSE 36.00 miFair74°F70°F88%1014 hPa
Kenosha, Kenosha Regional Airport, WI17 mi61 minW 310.00 miFair73°F66°F81%1015.5 hPa
Chicago / Wheeling, Pal-Waukee Airport, IL19 mi62 minSSE 410.00 miFair76°F71°F85%1015.4 hPa

Wind History from UGN (wind in knots)
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Last 24hrSE10SE11SE9SE11SE12SE11SE9SE10
G18
SE9SE5S10S9S5S7S6SW4CalmCalmCalmSW4CalmW3CalmS3
1 day agoCalmSE3CalmNE6NE8E8E6E7NE7NE7E6NE5CalmNE3CalmE3CalmCalmCalmNE3SE3SE4SE5SE6
2 days agoCalm--NE4NE6E8E6NE6NE8NE7NE6NE3NE3NE4NE4NE5E5NE4NE4CalmN3N5N4CalmCalm

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 Chicago, IL (9,2,3,4)
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Ground Weather Radar Station Chicago, IL
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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.