Monday, September25, 2017 L-36.com


Marine Weather and Tides
Lake Bluff, 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 6:41AMSunset 6:43PM Monday September 25, 2017 1:50 PM CDT (18:50 UTC) Moonrise 11:58AMMoonset 10:07PM Illumination 26% Phase: Waxing Crescent; Moon at 5 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- 919 Am Cdt Mon Sep 25 2017
Rest of today..Southeast winds 10 to 15 kt becoming east in the afternoon. Sunny. Waves 1 to 2 ft.
Tonight..Southeast winds 10 to 15 kt becoming south 5 to 10 kt after midnight. Mostly clear. Waves 1 ft or less.
Tuesday..South winds 5 to 10 kt. Slight chance of showers in the afternoon. Waves 1 ft or less.
Tuesday night..West winds 10 to 15 kt becoming northwest 15 to 20 kt after midnight. Slight chance of showers through the night. Waves 1 ft or less building to 1 to 3 ft after midnight.
LMZ740 Expires:201709252130;;911648 FZUS53 KLOT 251419 NSHLOT NEARSHORE MARINE FORECAST National Weather Service Chicago/Romeoville IL 919 AM CDT Mon Sep 25 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>742-252130-

7 Day Forecast for Marine Location Near Lake Bluff, IL
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location: 42.28, -87.83     debug


Area Discussion for - Chicago, IL
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Fxus63 klot 251742
afdlot
area forecast discussion
national weather service chicago romeoville, il
1242 pm cdt Mon sep 25 2017

Short term
325 am cdt
through tonight...

another hot one by not only late september criteria but also mid-
summer standards is in store today. If 90 is reached at chicago
it would be the first time with six 90 degree days in a row since
july 2012 and the first time in september since 1978.

The longstanding upper ridge continues across the eastern half of
the country today. There is a weak short wave circulation and
associated 700mb cool pocket (+5c) seen on water vapor imagery
over southern illinois this morning. This feature will drift
north today in the highly amplified pattern, and patches of
high mid cloud with it as well as some more cumulus will be seen.

Forcing from this wave provides an outside chance of a couple
showers this afternoon mainly in northwest to north central
illinois. This is where the cap is forecast to be neared or just
barely overcome -- and that is factoring boundary layer mixing of
lower dew points. None of the cam solutions are overly excited
but have simulated reflectivity "blips" in that area.

Temperatures early this morning are running about 1-3 degrees
cooler than previous mornings thanks to lower dew points and
850-925mb temperatures down about 1c in 24 hours. Taking this into
account, have high temperatures forecast around 90 which would be
near or right at record. The slightly lower dew points of lower
60s keep forecast heat index readings just a degree or two above
the temperature. A lake breeze again will develop by noon and
advance inland in lake adjacent counties in a similar way to
yesterday. Expecting downtown to peak in 80s.

Mtf

Long term
325 am cdt
Tuesday through Sunday...

a couple small chances for rain -- which has been a rarely used
word locally this month -- present themselves on Tuesday and then
again late in the week. All in all though, dryness should prevail
much of if not all of this week. While some locations especially
east could be up to the 90 mark Tuesday, a noticeable change in
temperatures will occur during this period. The first drop back
to around normal is by Wednesday and the one to 5-10 degrees
below normal on Friday.

The surface cold front over the plains this morning will make very
gradual progress into the area Tuesday evening. Overall forcing
along this boundary is not impressive, especially for much or any
thunder given marginal lapse rates. The speed of this boundary may
be even slower than what guidance is indicating given the
strength of the inherent ridge as well as the parent surface low
being fairly weak in pressure (1012mb at 00z wed). The slightly
better probability of some showers Tuesday afternoon and evening
is west of i-55.

Northwest winds behind the front on Tuesday night into Wednesday
will bring a seasonable air mass into the area, with highs in the
70s for Wednesday and Thursday. Both of those midweek days look to
be mainly sunny.

As the upper ridge collapses, a modestly strong upper trough drops
southeast into the great lakes on Friday. The associated cold
front looks to be strengthening as it moves through, meaning
breezy conditions on Friday, possibly with some showers along the
front. Lake effect clouds look likely though do not see a strong
enough signal for lake effect showers at this time. Highs look to
dip to the mid to upper 60s for a good part of the CWA Friday and
Saturday with a slight rebound into early next week.

Mtf

Aviation
For the 18z tafs...

light winds andVFR conditions are being reported across the area
on the backside of departing high pressure.VFR CU will continue
to form this afternoon. A lake breeze is pushing inland, and looks
like it will reach ord and mdw btwn 21z and 22z. I have medium-
high confidence in when the lake breeze will turn winds easterly
at ord and mdw. At least the initial push of wind should be around
10 kt.

Winds become southwest ahead of a front Tuesday morning.VFR
clouds increase, but I have low confidence in precip occurring.

The main wave of upper level energy will lift northwest over
minnesota and southern ontario. Meanwhile energy along the front
is forecast to weaken as it moves through the region. Throw in the
dry spell, and I think showers will struggle to form. However, if
any isolated showers or storms form, they will be near rfd after
18z. I doubt that any of the eastern sites will receive precip.

Jee

Marine
335 am cdt
a similar wind pattern will be seen over the lake today as in
recent days, with an onshore lake breeze developing in the
illinois nearshore and to a lesser extent the indiana nearshore. A
cold front will move across the lake on Tuesday night turning
winds northwest. Small craft criteria waves on Wednesday look
probable for part of and maybe the entire northwest indiana shore.

A second stronger cold front, more typical of early autumn, will
move southward across the lake late Thursday night into early
Friday. This has potential for some gales over the open water
depending on the low strength and exact track as it dives
southeast over ontario and great lakes region.

Mtf

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 6 mi70 min S 5.1 G 6 80°F
45174 14 mi30 min ESE 9.7 G 12 74°F 71°F1 ft69°F
KNSW3 - Kenosha, WI 21 mi50 min SSE 11 G 12 74°F 1014.9 hPa (-1.4)
FSTI2 23 mi110 min SE 15 76°F
OKSI2 28 mi110 min ESE 4.1 83°F
CHII2 - Chicago, IL 29 mi50 min ESE 13 G 14 78°F 66°F
CNII2 32 mi35 min 79°F
JAKI2 37 mi110 min SSE 1.9 78°F
CMTI2 - 9087044 - Calumet, IL 41 mi50 min ENE 6 G 8.9 82°F 1014.8 hPa (-1.3)67°F

Wind History for Calumet Harbor, IL
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago/Waukegan Regional Airport, IL10 mi55 minESE 610.00 miFair84°F64°F53%1014 hPa
Chicago / Wheeling, Pal-Waukee Airport, IL12 mi58 minSSE 510.00 miFair91°F57°F33%1014.8 hPa
Chicago, Chicago-O'Hare International Airport, IL21 mi59 minVar 410.00 miPartly Cloudy90°F55°F32%1014.3 hPa
Kenosha, Kenosha Regional Airport, WI22 mi57 minESE 1110.00 miFair89°F64°F45%1014.7 hPa

Wind History from UGN (wind in knots)
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Last 24hrSE8SE8SE9SE7SE4CalmCalmSE3SE4SE5SE5CalmCalmS4CalmCalmSW33SW3S4SE43E6E6
1 day agoSE9E7SE8SE8SE5SE3CalmCalmCalmSE4SE5S4CalmCalmCalmCalmCalmCalmCalmSW6S6SW76SE8
2 days agoSE10SE10SE9SE7SE5SE5S5S5S6S7S7CalmSW4SW5SW5CalmCalmCalmCalmS3S5SE5E6E7

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
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IR Satellite Image from GEOS
east_satellite

GOES Local Image of Midwest    EDIT
Geos

Wind Forecast for Chicago, IL (14,3,4,5)
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Ground Weather Radar Station Chicago, IL
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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.