Wednesday, November22, 2017 L-36.com


Marine Weather and Tides
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 6:48AMSunset 4:25PM Wednesday November 22, 2017 5:08 AM CST (11:08 UTC) Moonrise 11:08AMMoonset 8:56PM Illumination 14% Phase: Waxing Crescent; Moon at 4 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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LMZ742 Winthrop Harbor To Wilmette Harbor- Wilmette Harbor To Northerly Island- Northerly Island To Calumet Harbor- 303 Am Cst Wed Nov 22 2017
Today..Northwest winds 10 to 20 kt becoming west 10 to 15 kt in the afternoon. Mostly Sunny. Waves 3 to 5 ft subsiding to 1 to 3 ft.
Tonight..Southwest winds 10 to 20 kt. Mostly cloudy. Waves 1 to 3 ft.
Thursday..Southwest winds 10 to 20 kt. Partly Sunny in the morning then clearing. Waves 1 to 3 ft.
Thursday night..Southwest winds 10 to 20 kt. Mostly clear. Waves 1 to 3 ft.
LMZ742 Expires:201711221600;;784943 FZUS53 KLOT 220903 NSHLOT NEARSHORE MARINE FORECAST National Weather Service Chicago/Romeoville IL 303 AM CST Wed Nov 22 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>742-221600-

7 Day Forecast for Marine Location Near Chicago, IL
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location: 41.85, -87.6     debug


Area Discussion for - Chicago, IL
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Fxus63 klot 220755
afdlot
area forecast discussion
national weather service chicago romeoville, il
155 am cst Wed nov 22 2017

Short term
123 am cst
through thanksgiving day...

quiet conditions will be in place for the busy travel day and for
thanksgiving day.

It will indeed be a cold start to the day in wake of yesterday's
front, though lake effect cloudiness across northwest indiana is
doing its work as a natural blanket to keep things warmer in lee
of the lake. High pressure across the plains will shift into the
region today which allow for winds to slacken over what has been
several windy breezy days. The high center will pass to our south,
so we will still maintain a lighter wind that will shift to
southwest through the day. In spite of warm advection kicking in
through the day, highs will struggle to get out of the 30s. Some
passing high clouds will give way to some thicker mid and high
clouds ahead of the next disturbance, this one currently across
canadian prairies northern plains. The wave will pass through
wisconsin tonight, providing us just increased cloud cover and a
warmer night. Weak high pressure will fill in behind this weaker
system for thanksgiving day, which will result in mostly sunny
conditions and temperatures in the lower to mid 40s, just a tad
below normal.

Kmd

Long term
123 am cst
Friday through Tuesday...

the only real chance for precipitation will be Friday night. The
up and down pattern continues as low pressure will again deepen
north of lake superior Friday in a similar fashion to what
occurred on Monday. With a sub 980 mb low, expect south southwest
winds to increase quickly, and highs will be on par with or maybe
a tad higher than Monday's highs which were in the low to mid 50s.

The pendulum will shift back down on Friday night with the cold
front providing a chance for some light rain. This cold air is
only a glancing blow, thus temps Saturday will be near normal in
the low to mid 40s. Expansive high pressure across the west will
shift in Saturday night into Sunday, resulting in a cold night and
cool day Sunday, though cloud cover will be minimal.

Longer range guidance, which has been all over the place for some
time here, is indicating a system will eject out of the west
early in the week. All indications are that this system will
impact areas to our north a bit more, with our region remaining on
its warmer and generally drier side, though it could bring some
light rain.

Kmd

Aviation
For the 06z tafs...

no significant aviation forecast concerns through Wednesday night.

Strong surface high pressure continues to build southeast across
the plains overnight in the wake of Tuesday's cold frontal
passage. Cold, dry low level air spreading in on northwest winds
has allowed skies to clear across the region, except for someVFR
3500-4500 foot stratocu along the lake and downwind into northwest
indiana and michigan. This too will shift off to the east
Wednesday morning as low level winds back more westerly. Winds,
still above 10 kts at times late Tuesday evening, will continue to
diminish and back to the southwest by Wednesday afternoon. Speeds
will come up a bit again Wednesday night. Warm air advection will
spread loweringVFR cloud cover back across the terminals late in
the day and Wednesday night.

Ratzer

Marine
155 am... A large area of high pressure over the plains will move
east to the ohio valley tonight and then drift east across the mid
atlantic on Friday. Strong low pressure will move across ontario
Friday and Friday night with a tight pressure gradient developing
over the lakes region. Southwesterly gales are likely over lake
michigan Friday. Speeds may diminish a bit Friday night as a cold
front moves across the lake by Saturday morning. A shorter period
of gales is possible Saturday as colder air spreads across the
lake but confidence is lower for gales behind the front. A ridge
of high pressure is expected to cross the lake Sunday. Cms

Lot watches warnings advisories
Il... None.

In... None.

Lm... Small craft advisory... In nearshore waters until 9 am Wednesday.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CNII2 1 mi38 min WNW 8 G 15 28°F 16°F
OKSI2 4 mi128 min WNW 1.9 28°F
CHII2 - Chicago, IL 5 mi48 min NW 17 G 18 28°F 17°F
JAKI2 5 mi128 min NW 6 27°F
FSTI2 9 mi128 min NW 19 25°F
CMTI2 - 9087044 - Calumet, IL 9 mi50 min W 6 G 9.9 25°F 1024.9 hPa14°F
BHRI3 - Burns Harbor, IN 28 mi83 min NNW 13 G 20 33°F 1024.7 hPa
WHRI2 - Waukegan Harbor, IL 37 mi88 min WNW 6 G 8.9 23°F
MCYI3 - Michigan City, IN 37 mi48 min NNW 18 G 21 33°F 21°F

Wind History for Calumet Harbor, IL
(wind in knots)    EDIT      (on/off)   Help
5
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Last
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SW13
G19
SW10
G17
SW11
G15
SW10
G16
SW10
G16
SW9
G15
W8
G15
W8
G12
W7
G11
W6
G11
W7
G14
NW13
G20
NW12
G17
NW7
G11
W9
G13
NW10
G17
NW11
G17
NW9
G16
NW10
G15
W7
G13
NW6
G10
W6
G11
W7
G10
W8
1 day
ago
S10
G15
S12
G18
S11
G17
S13
G19
S12
G18
S17
G23
S13
G19
S17
G22
S19
G25
S17
G23
S15
G23
S14
G22
S14
G23
S17
G27
S18
G26
S16
G22
S16
G29
S18
G25
S21
G27
S17
G23
S15
G21
S13
G23
S14
G20
S15
G21
2 days
ago
NW11
G16
W7
G11
NW12
G17
W10
G19
W12
G18
W9
G14
SW9
G14
SW13
G18
SW10
G15
SW7
G15
W9
G13
W8
G15
SW8
G13
SW7
G10
SW6
G11
SW8
G11
SW4
G7
SW8
G13
SW9
G13
SW7
G12
SW7
G10
SW10
G13
SW9
G12
S9
G12

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago, Chicago Midway Airport, IL9 mi75 minNNW 810.00 miFair26°F14°F60%1026.9 hPa
Chicago, Chicago-O'Hare International Airport, IL18 mi77 minNNW 710.00 miA Few Clouds25°F15°F66%1026.3 hPa
Gary Regional Airport, IN19 mi1.9 hrsWNW 910.00 miOvercast29°F14°F55%1025.1 hPa
Lansing Municipal Airport, IL22 mi73 minNW 610.00 miPartly Cloudy25°F16°F71%1025.4 hPa
Chicago / Wheeling, Pal-Waukee Airport, IL24 mi76 minNNW 410.00 miFair21°F15°F78%1027.2 hPa

Wind History from MDW (wind in knots)
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Last 24hrSW10SW13SW12W12
G21
W12W10W13
G21
W12NW12NW17
G22
NW13NW12NW6NW8N13NW13NW9NW11
G18
NW11N12NW10NW8N8NW9
1 day agoSW10SW10SW12SW13
G22
SW14
G19
SW19
G24
SW15
G23
SW16
G23
SW16
G23
SW18
G26
S17
G27
S17
G25
S16
G27
S16
G26
SW18
G31
S15
G26
S20
G28
S16
G28
SW16
G25
SW15SW15S11SW12SW11
2 days agoNW12W12
G20
NW12NW13
G19
NW10W14
G18
W14W13W12
G18
W11
G16
W9W9SW8SW8W8SW9SW7SW7SW9SW10SW8SW8SW10SW8

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 (6,6,7,8)
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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.