Monday, December16, 2019
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Marine Weather and Tides
Chicago, IL

Version 3.4
NOTICE
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.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 7:10AMSunset 4:22PM Monday December 16, 2019 8:20 AM CST (14:20 UTC) Moonrise 10:15PMMoonset 11:57AM Illumination 77% Phase: Waning Gibbous; Moon at 20 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 Expires:201912161600;;865811 Fzus53 Klot 160943 Nshlot Nearshore Marine Forecast National Weather Service Chicago/romeoville Il 343 Am Cst Mon Dec 16 2019 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>743-161600- Winthrop Harbor To Wilmette Harbor- Wilmette Harbor To Northerly Island- Northerly Island To Calumet Harbor-calumet Harbor To Gary- 343 Am Cst Mon Dec 16 2019
Today..North winds 10 to 15 kt. Cloudy. Waves 1 ft or less building to 1 to 3 ft.
Tonight..North winds 10 to 20 kt. Mostly cloudy in the evening then becoming partly cloudy. Waves 2 to 4 ft building to 3 to 5 ft after midnight.
Tuesday..West winds 15 to 25 kt. Sunny. Waves 3 to 5 ft subsiding to 2 to 4 ft in the afternoon.
Tuesday night..Northwest winds 15 to 25 kt. Mostly cloudy in the evening then becoming partly cloudy. Waves building to 3 to 5 ft.
LMZ742


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 161144 AFDLOT

Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 544 AM CST Mon Dec 16 2019

SHORT TERM. 245 AM CST

Through Tonight .

Light snow continues to wind down across the area early this morning. Expect all of this to be done prior to daybreak. For this reason, we plan to end the winter weather advisory for our southern counties.

Forecast attention then turns to the second wave of snow, which is already blossoming over central and southern KS. This activity is expected to continue developing eastward across MO and downstate IL later today into this evening in response to the mid/upper level impulse over the CO Rockies shifting eastward over KS and into MO. The heaviest precipitation with this disturbance today into this evening will likely focus well to our south along another strengthening west to east- northeast band of frontogenesis. However, it does appear that parts of my southeastern CWA (namely my east central IL and northwestern IN counties south of I-80) could get clipped by some of this snow very late today into this evening. For this reason, I have continued the mention of snow into this evening in this area. Expect any light snow over this area to gradually end overnight with any snow accumulations to remain under an inch.

Elsewhere, expect mainly dry, but cloudy conditions today. Highs will be in the low 30s. Temperatures tonight will drop back into the mid to upper teens over north central IL and into the low to mid 20s farther east.

KJB

LONG TERM. 306 AM CST

Tuesday night through Sunday .

An impressive PV anomaly will dig southeastward over the eastern Great Lakes and over the northeastern CONUS into Wednesday. This particular track will result in heart of a fairly impressive arctic airmass missing us to the east. We will, however, get a glancing hit at some of this arctic air on Wednesday as an area of surface high pressure settles over the area. This will result in our coldest day of the week, with temperatures likely remaining in the low to mid 20s and overnight lows in the single digits to the middle teens.

Since this will be a glancing hit of the cold air, it will also be short lived. In fact, once the surface high shifts to our southeast Wednesday night the lower level flow will become southerly, and warm air advection will kick up over our area into Thursday. This should push temperatures back into the middle 30s for Thursday, and likely around 40 by Friday.

Warmer weather is looking likely for the weekend and into early next week as a large upper level ridge builds over the central part of the country. This type of pattern will favor dry and mild conditions for the area. The current forecast has temperatures getting well into the 40s for Sunday and Monday, but we cant rule out readings breaking the 50 degree mark during this period.

KJB

AVIATION. For the 12Z TAFs .

544 AM . Forecast concerns include .

Wind directions today . trending north/northeast. Mvfr cigs today.

A few flurries will still be possible this morning. Additional light snow this afternoon into tonight will remain south of the terminals . and likely along/south of a pnt/ikk/vpz line.

Mvfr cigs are expected this morning and should begin to scatter out and slowly move southeast this afternoon. But confidence is low for far northern IL with higher confidence for mvfr cigs along and south of arr/mdw/gyy line. Some light fog will also be possible for a few hours this morning.

Light northerly winds this morning will eventually favor a more north/northeast direction by late morning and into this afternoon. Speeds will be less than 10kts. Wind directions will turn back northerly this evening and northwest by Tuesday morning. cms

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

VISIT US AT HTTP://WEATHER.GOV/CHICAGO (ALL LOWERCASE)

FOLLOW US ON FACEBOOK . TWITTER . AND YOUTUBE AT: WWW.FACEBOOK.COM/NWSCHICAGO WWW.TWITTER.COM/NWSCHICAGO WWW.YOUTUBE.COM/NWSCHICAGO


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CNII2 1 mi21 min NNW 2.9 G 8 29°F 25°F
CHII2 - Chicago, IL 5 mi31 min NW 11 G 12 28°F 27°F
CMTI2 - 9087044 - Calumet, IL 9 mi51 min Calm G 1.9 29°F 1022 hPa27°F
MCYI3 - Michigan City, IN 37 mi31 min E 1.9 G 2.9 28°F 22°F

Wind History for Calumet Harbor, IL
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago, Chicago Midway Airport, IL9 mi28 minNNW 67.00 miOvercast27°F21°F81%1024.5 hPa
Chicago, Chicago-O'Hare International Airport, IL18 mi30 minNW 37.00 miOvercast26°F21°F84%1023.8 hPa
Gary Regional Airport, IN19 mi36 minN 05.00 miFog/Mist28°F24°F86%1023 hPa
Lansing Municipal Airport, IL22 mi26 minN 05.00 miFog/Mist27°F25°F94%1023 hPa
Chicago / Wheeling, Pal-Waukee Airport, IL24 mi29 minNW 410.00 miOvercast26°F19°F78%1024.2 hPa

Link to 5 minute data for KMDW

Wind History from MDW (wind in knots)
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Last 24hrW8SW5W4SW3SW5S6S5S4S4S4S4SW4SW3SW4CalmCalmN4N3N4N5N4NW5N8NW6
1 day agoNW8NW8NW9W9W11W12W11NW11NW15
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2 days agoS6S5SW6S7S7SW4SW9SW5S5SW6S4CalmS3CalmCalmCalmCalmCalmCalmW3CalmN5W3W6

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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wmap_A
GEOS Local Image of    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 (9,2,3,4)
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Ground Weather Radar Station Chicago, IL
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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.