Wednesday, October18, 2017 L-36.com


Marine Weather and Tides
Highland Park, 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 7:07AMSunset 6:04PM Wednesday October 18, 2017 11:54 AM CDT (16:54 UTC) Moonrise 5:45AMMoonset 5:56PM Illumination 3% Phase: Waning Crescent; Moon at 28 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- 920 Am Cdt Wed Oct 18 2017
.small craft advisory in effect through late tonight...
Rest of today..South winds 20 to 25 kt. Occasional gusts to 30 kt possible this afternoon. Sunny. Waves 2 to 4 ft building to 3 to 5 ft.
Tonight..Southwest winds 20 to 25 kt diminishing to 10 to 20 kt after midnight. Mostly clear. Waves 2 to 4 ft subsiding to 1 to 3 ft after midnight.
Thursday..Northwest winds 10 to 15 kt becoming northeast 5 to 10 kt in the afternoon. Sunny. Waves 2 ft or less.
Thursday night..South winds 10 to 15 kt. Clear. Waves 2 ft or less.
LMZ740 Expires:201710182100;;044143 FZUS53 KLOT 181420 NSHLOT NEARSHORE MARINE FORECAST National Weather Service Chicago/Romeoville IL 920 AM CDT Wed Oct 18 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>742-182100-

7 Day Forecast for Marine Location Near Highland Park, IL
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location: 42.18, -87.81     debug


Area Discussion for - Chicago, IL
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Fxus63 klot 181054
afdlot
area forecast discussion
national weather service chicago romeoville, il
554 am cdt Wed oct 18 2017

Short term
200 am cdt
through tonight...

high pressure is still stretched from central texas northeast
through the ohio valley and into the mid atlantic. A second and
stronger low pressure system will slide by north of the canadian
border. Therefore, we can expect a near repeat of Tuesday, with
mostly clear skies, breezy southwest winds (approaching 30-35
mph), and highs in low 70s. The stronger northern low will send a
weak cold front toward the area Wednesday night into Thursday.

Impacts will be minor, but we will see a small cooldown, slightly
more noticeable in far northeast illinois. Winds will slacken and
veer to wnw, before weak high pressure spreads east of lake
michigan on Thursday afternoon, bringing brief onshore flow.

Kmd

Long term
200 am cdt
Thursday through Tuesday...

the pattern Friday reverts to that of earlier in the week, with the
high over the ohio valley mid atlantic region expanding northward,
and the upstream low will now be ejecting from a deep broad western
upper level trough axis. With seasonally slightly mild overnight
lows, Friday highs should easily cruise into the mid 70s.

The first half of the weekend still looks to be alright for most
locations as we await the arrival of the upper trough, but expect
clouds to thicken. Friday night will be quite mild for the latter
portion of october, and thus in spite of the clouds highs should
still hit the lower to maybe mid 70s. There are a few guidance
sources that paint a few lighter pre-frontal showers during the
day, but these don't look to be a big deal as moisture return
behind the departing high will be focused west of the area
Saturday.

Better rain chances return Saturday night into Sunday as the
upper trough will move through. A feed of 60+ dewpoints will
advect in ahead of it on a strong low level jet. Upper forcing
will be augmented by a strengthening upper jet, and there is still
a strong signal in a favorable ramp up in precipitation chances
by Saturday night or more so Sunday morning. The system does show
signs of splitting between a more intact low to the south and a
broad northern stream trough, with lend to the idea that this will
not a be a huge rain maker, but still a decent chance of some
rain. With plentiful clouds, instability will be tempered, but
there could be a few t-storms.

With the post frontal air mass being of the pacific origin,
temperatures now look to initially fall back to more seasonal levels
Sunday Monday, but the upper jet will shift more meridional in the
tues Wed time frame which would bring a bit more significant cold
front in during this time.

Kmd

Aviation
For the 12z tafs...

winds will be the only aviation concern today as the surface
gradient continues to support gusty south-southwesterly winds.

Expect winds to become gusty again up into the lower 20 kt range
by mid morning, then up around 25 kt during the afternoon.

Otherwise, similar to Tuesday, expect these gusty winds to ease
with sunset.

Vfr conditions continue to be expected through the period.

Kjb

Marine
254 am cdt
the main weather concern over lake michigan through the rest of
the week continues to be with the strong gales expected today into
tonight, especially over northern sections of the lake. However,
another period of near gale force winds looks likely Friday night
into Saturday.

An expansive area of high will remain dominate from the lower
ohio valley to the mid-atlantic region through the rest of the
week. Meanwhile, a strong storm system over central manitoba
early this morning, will shift eastward across northern ontario by
this evening. The associated surface pressure gradient over the
lake will support a rapid uptake in the south-southwesterly winds
over the lake today. Gales of 40 to 45 kt are expected by mid to
late this afternoon into the early evening over the northern half
of the lake. The gales should gradually subside after midnight as
the winds veer westerly.

Yet another period of enhanced southerly winds look possible late
Friday into Saturday as another storm system shifts northeastward
across south central canada. Wind speeds with this event could
again approach gale force.

Kjb

Lot watches warnings advisories
Il... None.

In... None.

Lm... Small craft advisory... Lmz740-lmz741-lmz742-lmz743-lmz744-
lmz745... 9 am Wednesday to 3 am Thursday.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
45174 9 mi35 min S 12 G 14 61°F 57°F2 ft46°F
WHRI2 - Waukegan Harbor, IL 13 mi75 min S 12 G 14 59°F
FSTI2 17 mi115 min S 22 63°F
OKSI2 21 mi115 min N 1.9 65°F
CHII2 - Chicago, IL 22 mi55 min S 17 G 19 61°F 45°F
CNII2 25 mi40 min S 11 G 15 63°F 41°F
KNSW3 - Kenosha, WI 28 mi55 min SSW 9.9 G 18 63°F 1019 hPa (-1.0)
JAKI2 30 mi115 min SSW 8.9 63°F
CMTI2 - 9087044 - Calumet, IL 34 mi55 min S 8 G 9.9 61°F 1020.4 hPa (-0.8)44°F

Wind History for Calumet Harbor, IL
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago / Wheeling, Pal-Waukee Airport, IL7 mi63 minSSW 910.00 miFair63°F45°F52%1020.6 hPa
Chicago, Chicago-O'Hare International Airport, IL15 mi64 minSW 1310.00 miFair62°F42°F48%1020.3 hPa
Chicago/Waukegan Regional Airport, IL17 mi60 minSSW 1310.00 miFair63°F44°F50%1019.1 hPa

Wind History from PWK (wind in knots)
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S7S5S5S7S7S7SW6S5S5S4S5S6S6S7S10S10S9
1 day agoSW8W8W8W8W7W7SW6S3S3S3CalmSE3CalmS5S4S5S5SW5SW8SW9SW7SW9SW10--
2 days agoNW15
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NW10NW11NW8NW7NW9NW7W5W6W3CalmCalmW3W3W4W3W4W4W4SW7

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 Midwest    EDIT
Geos

Wind Forecast for Chicago, IL (12,3,4,5)
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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.