Tuesday, October17, 2017 L-36.com


Marine Weather and Tides
North Chicago, 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 7:06AMSunset 6:06PM Tuesday October 17, 2017 6:08 AM CDT (11:08 UTC) Moonrise 4:40AMMoonset 5:26PM Illumination 9% Phase: Waning Crescent; Moon at 27 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- 251 Am Cdt Tue Oct 17 2017
.small craft advisory in effect from 7 am cdt this morning through this evening...
Today..Southwest winds 10 to 20 kt increasing to 20 to 25 kt during the day. Sunny. Waves 1 to 3 ft building to 2 to 4 ft.
Tonight..Southwest winds 10 to 20 kt. Clear. Waves 1 to 3 ft.
Wednesday..South winds 20 to 25 kt. Sunny. Waves 2 to 4 ft building to 3 to 5 ft in the afternoon. A small craft advisory will likely be needed.
Wednesday night..Southwest winds 15 to 25 kt. Mostly clear. Waves 2 to 4 ft.
LMZ740 Expires:201710171515;;983887 FZUS53 KLOT 170751 NSHLOT NEARSHORE MARINE FORECAST National Weather Service Chicago/Romeoville IL 251 AM CDT Tue Oct 17 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>742-171515-

7 Day Forecast for Marine Location Near North Chicago, IL
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location: 42.35, -87.79     debug


Area Discussion for - Chicago, IL
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Fxus63 klot 171053
afdlot
area forecast discussion
national weather service chicago romeoville, il
553 am cdt Tue oct 17 2017

Short term
220 am cdt
through Wednesday...

mostly sunny and mild fall weather will be
the story for the upcoming days. High pressure stretches from
central texas northeast through the ohio valley and into the mid
atlantic. The high will slowly become centered a bit farther east
each day. Meanwhile, a series low pressure systems will slide by
north of the canadian border. One today, and a slightly stronger
system on Wednesday. The sensible weather result will be breezy
southwest winds, though plentiful sunshine. Highs will be in the
ballpark of 70 degrees each day after the cooler nights.

Kmd

Long term
220 am cdt
Thursday through Monday...

the stronger northern low will send a weak cold front toward the
area Wednesday night into Thursday. Impacts will be fairly
negligible, but we will see a minor cooldown, and winds will
slacken and veer to wnw, before weak high pressure spreads east of
lake michigan on Thursday afternoon. This will bring some brief
onshore flow, and thus temps may dip a few degrees. We may also
get a few clouds with this too.

The pattern Friday reverts to that of earlier in the week, with the
high over the ohio valley mid atlantic region, but the low will now
be ejecting from a deep broad western upper level trough axis. With
seasonally mild overnight lows, Friday highs should springboard into
the 70s area wide. Most of Saturday will be dry as we await the
arrival of the upper trough, but expect clouds to thicken. Still, it
will be mild with 70s.

The party will come to an end Saturday night into Sunday as the
upper trough will move through. While the forcing is broad and
stretched out, 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. There are some timing differences in the
longer range guidance as to how quickly the moisture from the
gulf of mexico gets this far north which impact the specific 6
hour pop forecasts, but all indicate a favorable ramp up in
precipitation chances by Saturday night or more so Sunday morning.

With plentiful clouds, instability will be tempered, but there
could be a few t- storms. Colder air will return behind this
systems surface front as potent northwest flow will setup across
the northern tier of the country. Even colder air may be on the
horizon in far-out model land.

Kmd

Aviation
For the 12z tafs...

winds will be the only aviation concern today as the surface
gradient strengthens over the region. Expect winds to become
gusty out of the southwest this morning. Wind gusts into the low
to mid 20 kt range can be expected across the area by early this
afternoon. These gusty winds will abate by sunset. Otherwise,
expectVFR conditions through the period. Gusty south-
southwesterly winds will return on Wednesday.

Kjb

Marine
259 am cdt
the main weather concern over lake michigan this week is the
increasing potential for a period of high end southerly gales over
the northern half of the lake on Wednesday and Wednesday evening.

An expansive area of high is expected to become extended from the
lower ohio valley to the mid-atlantic today, and then remain
dominate here through much of the week. Meanwhile, a couple of
storm systems will shift eastward across canada through mid week.

The associated surface pressure gradient over the lake will
continue to be favorable to support a prolonged period of stout
southwest winds through mid to late week.

The first storm system, is currently shifting eastward across
northern ontario. This system is currently supporting
southwesterly winds to 30 kt. These wind speeds will gradually
ease through the day as this system shifts into northwestern
quebec later today.

The second storm system is expected to be the main story of the
week, however, as it is forecast to be a much more potent area of
low pressure. As such, this will set up a very strong gradient
over the lake on Wednesday and Wednesday night. During this period
high end south-southwesterly gales of 40 to 45 kt will be
probable, especially over the northern half to 2 3rds of the
lake. With this in mind, the current gale watch will likely need
to be converted to a gale warning later today.

Yet another period of enhanced southerly winds look possible late
Friday into Saturday as another storm system shifts northeastward
into 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... Nearshore waters
until 7 pm Tuesday.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WHRI2 - Waukegan Harbor, IL 1 mi89 min SW 14 G 16 52°F
45174 16 mi39 min SW 16 G 19 54°F 57°F2 ft42°F
KNSW3 - Kenosha, WI 17 mi69 min SW 12 G 18 53°F 1020.7 hPa (-0.6)
FSTI2 27 mi129 min W 5.1 51°F
OKSI2 32 mi129 min W 6 55°F
CHII2 - Chicago, IL 32 mi49 min SW 21 G 23 58°F 38°F
CNII2 35 mi39 min WSW 5.1 G 8 50°F
JAKI2 41 mi129 min WSW 7 51°F
CMTI2 - 9087044 - Calumet, IL 45 mi51 min SSW 9.9 G 13 51°F 1022.4 hPa40°F
45007 - S MICHIGAN 43NM East Southeast of Milwaukee, WI 46 mi79 min WSW 19 G 23 60°F 62°F4 ft1021 hPa (-0.7)
MLWW3 - Milwaukee, WI 48 mi49 min WSW 15 G 17 53°F

Wind History for Calumet Harbor, IL
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Last
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SW3
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SW6
G10
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G10
SW7
G13
SW7
G11
W6
G12
SW4
G11
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G11
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G12
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W7
G14
W5
G11
W6
G17
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G14
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G19
NW14
G21
W9
G15
W9
G15
NW9
G15
NW10
G16
NW8
G14
NW6
G9
W9
G15
NW6
G11
W7
G11
W5
G9
W3
G9
W5
G11
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G7
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G6
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G7
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G7
2 days
ago
SE2
SE2
E8
E5
G8
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G13
W3
G8
W1
SE4
E4
G7
E6
G9
E2
G8
SE8
SE9
G12
SE9
G12
NW4
G9
E9
G14
E8
G11
SE2
S7
S10
G15
S6
G9
S16
G21
SW12
G18
SW10
G18

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago/Waukegan Regional Airport, IL6 mi74 minSW 910.00 miFair49°F39°F69%1020.8 hPa
Chicago / Wheeling, Pal-Waukee Airport, IL18 mi77 minSSW 510.00 miFair50°F39°F66%1022.7 hPa
Kenosha, Kenosha Regional Airport, WI18 mi76 minSW 910.00 miFair50°F37°F63%1020.9 hPa

Wind History from UGN (wind in knots)
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Last 24hrW3CalmSW444SW8SW8SW84SW8--W3CalmCalmSW4SW5SW5SW7SW7SW6SW6SW8SW9SW11
1 day agoW11
G22
W8
G16
NW11
G19
NW15
G28
NW14
G24
NW13
G21
NW9
G20
NW10
G18
NW8NW75
G15
NW8W3NW6NW634W3CalmW3CalmCalmCalmSW3
2 days agoE5E5S5E4SE7SE5CalmE3SE3SE9SE10S12SE5S6SE8S13S11S15
G23
S13
G20
SW14SW20
G26
SW18
G26
SW9
G21
W8
G19

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 (7,2,3,4)
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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.