Thursday, January23, 2020
Privacy Policy
L-36.com


Marine Weather and Tides
Chicago, IL

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 7:09AMSunset 4:55PM Thursday January 23, 2020 2:37 PM CST (20:37 UTC) Moonrise 7:26AMMoonset 4:45PM Illumination 2% 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
    EDIT      (on/off)   Help
LMZ742 Expires:202001232215;;397074 Fzus53 Klot 231600 Nshlot Nearshore Marine Forecast National Weather Service Chicago/romeoville Il 1000 Am Cst Thu Jan 23 2020 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>742-232215- Winthrop Harbor To Wilmette Harbor- Wilmette Harbor To Northerly Island- Northerly Island To Calumet Harbor- 1000 Am Cst Thu Jan 23 2020
Rest of today..South winds 10 to 20 kt becoming southeast. Patchy fog. Snow and rain likely. Waves 1 to 3 ft.
Tonight..Southeast winds 10 to 15 kt becoming east 10 to 20 kt after midnight. Patchy fog in the evening. Snow likely in the evening. Rain through the night. Snow after midnight. Waves 1 to 3 ft building to 2 to 4 ft after midnight.
Friday..East winds 10 to 20 kt. Rain and snow. Waves 4 to 6 ft occasionally to 8 ft.
Friday night..Northeast winds 5 to 10 kt becoming north after midnight. Rain and snow. Waves 3 to 5 ft subsiding to 2 to 4 ft after midnight.
LMZ742


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


Area Discussion for - Chicago, IL
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
FXUS63 KLOT 232019 AFDLOT

Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 219 PM CST Thu Jan 23 2020

SHORT TERM. 216 PM CST

Through Saturday .

Tonight . Concern is on another batch of generally light to occasionally moderate precipitation this evening into the overnight hours, with focus on precipitation type and accumulation potential.

Upper level low pressure across Kansas will dig southeast toward the Ohio Valley tonight, but broad southwest flow ahead of the flow will continue to lead to occasional periods of precipitation through the night as a myriad of shortwaves pinwheel out ahead/north of the low. Therefore expect that while precipitation will never truly end, a more organized period of potential snow accumulation will return mid-late evening into the overnight hours ahead of a bit stronger lead shortwave near St. Louis. In spite of the continued generally light snow, surface/low level temperatures have warmed such that accumulations will be minimal in the near term.

A warm nose will push in from the south/southeast ahead of the low. This coupled with marginal surface temperatures, which should generally hold where they are or inch upward, should also mitigate the impacts from the snow tonight. But we do expect some increased chances for some light accumulations again or some slushy areas, beginning in our southern locations early evening, and mid to late evening farther north. Expect the higher accums on grass or untreated/elevated surfaces. Areas north and west of Chicago would stand the better chances for what is still to be somewhat lighter snow, though expect some uptick in the intensity of the falling snow during this period. 2" seem reasonable overnight far west in the colder air, with to inch or so toward Chicago.

KMD

Friday through Saturday afternoon .

This section will be forthcoming.

LONG TERM.

Sunday through Wednesday .

234 AM . Generally quiet weather and above normal temps are expected early next week with chances for precipitation returning midweek.

Depending on how fast this current system departs . there may still be some flurries possible Sunday morning Otherwise. models show rather moist low levels so it could be rather cloudy. A weak clipper system may move across the northern Great Lakes Monday night into Tuesday with precipitation with this system likely remaining north of the area. After this time period confidence is very low for how the next system will evolve given different placement and phasing. It could end up being a long duration event similar to this current system if a slow moving upper low develops. From this distance . low chance pops for rain/snow on track. cms

AVIATION. For the 18Z TAFs .

Concerns:

- Prolonged period of precipitation with occasional bursts of briefly moderate snow - Timing the changes in Ceiling categories from IFR to LIFR - IFR visibilities

A leading batch of snow will shift through the terminals early this afternoon, and visibilities have generally dropped to 1 to 1 1/2SM. 3/4SM vis has been very infrequent. There may be breaks at times this afternoon but continued upglide suggests at least snow/rain/drizzle dominating, and with this we would suspect ceilings should stay down into IFR. The exception would be in NW Indiana and occasionally into MDW., with some LIFR possible in between waves, and we expect the ceilings may even drop outside of the precipitation is it turns more into drizzle.

The next batch of precip will spread in this evening, with maybe slightly earlier start then previous TAFs for ORD/MDW. A warm nose will likely allow rain to mix in with snow (and will become dominant south of ORD). Surface temperatures will be more marginal for accumulation overnight also, with the better chances north and west of Chicago.

Precipitation will continue to transition to Rain/Snow or Rain from the southeast, though ceilings (and at times vis) will more than likely remain IFR.

KMD

LOT WATCHES/WARNINGS/ADVISORIES. IL . None. IN . None. LM . None.

Visit us at weather.gov/chicago

Follow us on Facebook, Twitter, and YouTube at: www.facebook.com/NWSChicago www.twitter.com/NWSChicago www.youtube.com/NWSChicago


Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CNII2 1 mi22 min SSE 8 G 8 34°F 31°F
CHII2 - Chicago, IL 5 mi37 min S 12 G 14 33°F 33°F
CMTI2 - 9087044 - Calumet, IL 9 mi49 min 34°F 1016.6 hPa33°F
MCYI3 - Michigan City, IN 37 mi37 min SSE 9.9 G 13 35°F 29°F

Wind History for Calumet Harbor, IL
(wind in knots)    EDIT      (on/off)   Help
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
Last
24hr
S12
G17
S10
G17
S9
G16
S7
G16
S7
G10
S9
G12
S9
G12
S10
G14
S9
G13
S8
G13
S8
G13
S10
G14
S8
G11
S8
G11
S6
G10
S7
G10
S6
G9
SE7
G11
S8
G12
S7
G10
S8
G11
S6
S7
G10
S6
G11
1 day
ago
SW7
G12
SW5
G10
S5
G9
S8
G12
S4
G7
S5
S5
G8
S6
G10
S9
G13
S9
G13
S11
G14
S11
G18
S6
G9
S10
G13
S11
G14
S9
G16
S12
G17
S12
G17
S10
G14
S10
G15
S11
G17
S9
G15
S8
G15
S11
G17
2 days
ago
S3
NW7
G12
N8
G11
N5
G9
N9
N6
NW5
G8
W4
W3
W3
W4
W3
W4
W2
W2
SW3
SW2
S5
SW4
G7
SW4
SW4
G8
SW5
G8
S9
G12
S7
G11

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports. Follow links for more data.
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago, Chicago Midway Airport, IL9 mi44 minS 72.00 miLight Snow Fog/Mist34°F30°F89%1018 hPa
Chicago, Chicago-O'Hare International Airport, IL18 mi46 minSSE 52.50 miLight Snow Fog/Mist33°F30°F92%1017.1 hPa
Gary Regional Airport, IN19 mi52 minS 610.00 miFog/Mist36°F32°F87%1017.6 hPa
Lansing Municipal Airport, IL22 mi42 minN 010.00 miLight Drizzle34°F32°F94%1017.3 hPa
Chicago / Wheeling, Pal-Waukee Airport, IL24 mi45 minSSE 61.00 miOvercast with Haze35°F30°F82%1017.7 hPa

Link to 5 minute data for KMDW

Wind History from MDW (wind in knots)
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
Last 24hrS9
G18
S15
G23
S11S10
G21
S9S9
G18
S12
G19
S8S11S8S9S9S9S9S8S6S8S8
G16
S8
G19
S10S9S9S8S7
1 day agoSW10SW10SW11S9S6SW9S10SW11S9SW11
G18
SW11
G19
SW9SW8S10S12
G21
SW10
G19
SW8
G19
SW8S12S11
G20
S12
G21
SW11S12
G24
S12
G23
2 days agoNW9NE5NE8N7N5N6NW8NW7NW4NW5W4NW3NW4W4W3W3SW4SW4W4W8W9SW9SW10W12

Tide / Current Tables for
   EDIT   Weekend mode (on/off)   (on/off)   Help
Tide / Current Tables for
   EDIT      (on/off)   Help
Weather Map
       (on/off)   Help Weather Map
wmap_A
GEOS Local Image of Midwest    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Chicago, IL (15,3,4,5)
      (on/off)   Help

Ground Weather Radar Station Chicago, IL
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

Cookie Policy:
This website uses cookies to save your settings. No personal information is saved. I do not collect statistics on your visit. You can disable cookies in your browser if you like but it is not recommended for this site. I do not sell cookies. Go to a bakery for that. In fact I do not sell anything. To disable cookies from L-36.com, please refer to the Help button in your browser.
Privacy Policy:
I do not sell or share any user data or anything else for that matter. The only personal information I save is in the site log which has a line for each page view which includes the IP address your browser sends in the header as well as which page you requested. I use this to block hackers and other bad actors. I do not use this raw data to create profiles on users. I periodically delete the log files. If you are subject to CCPA, Google ads on this site will not be based on your past behavior so you will likely not see an ad for a lawn mower just because you looked for one at a big box website. I do not believe this site is subject to CCPA but I am doing what I can to follow the guidelines anyway.
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 numerous 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.