Friday, December6, 2019
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Marine Weather and Tides
North 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 7:04AMSunset 4:20PM Friday December 6, 2019 2:05 PM CST (20:05 UTC) Moonrise 2:43PMMoonset 2:11AM Illumination 74% Phase: Waxing Gibbous; Moon at 10 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- 900 Am Cst Fri Dec 6 2019
.small craft advisory in effect until 6 pm cst this evening...
Rest of today..North winds to 30 kt diminishing to 10 to 20 kt by early afternoon. Becoming mostly Sunny. Waves 5 to 8 ft occasionally to 10 ft subsiding to 4 to 7 ft occasionally to 9 ft in the afternoon.
Tonight..North winds 5 to 10 kt becoming light and variable by midnight. Partly cloudy. Waves 3 to 5 ft subsiding to 1 to 3 ft after midnight.
Saturday..South winds 10 to 20 kt. Mostly Sunny. Waves 1 to 3 ft.
Saturday night..South winds to 30 kt. Partly cloudy in the evening then becoming mostly cloudy. Waves 2 to 4 ft.
LMZ740 Expires:201912062245;;941405 FZUS53 KLOT 061500 NSHLOT NEARSHORE MARINE FORECAST National Weather Service Chicago/Romeoville IL 900 AM CST Fri Dec 6 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>742-062245-


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 061910 AFDLOT

Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 110 PM CST Fri Dec 6 2019

SHORT TERM. 110 PM CST

Through Saturday night .

Dry and milder weather conditions are on tap through the start of the weekend, as high pressure builds across the area tonight then drifts off to the east Saturday.

Surface cold front which moved through the area overnight has pushed into the Ohio Valley early this afternoon per 18Z surface analysis. High pressure centered across the mid-Missouri Valley will spread east across the area tonight. Gusty northerly winds have eased since this morning, and will continue to diminish through the afternoon and evening hours as the surface ridge approaches. Advection of drier low level air has also allowed clouds to erode from north to south, except for parts of northwest Indiana and east central Illinois where low level parcel trajectories off of Lake Michigan continue to support stratocu. These areas will also clear later this afternoon/evening however, as winds diminish and become light and variable. Skies will be mainly clear tonight, save for some passing patchy cirrus associated with the main upper jet axis to our north. The combination or light variable or calm winds and mainly clear should allow for strong radiational cooling conditions overnight, and have thus undercut guidance mins a bit for tonight, particularly in our typical colder spots west of Chicago.

The surface ridge axis will shift east/southeast of the area by early Saturday, allowing winds to shift to the south. Low level warm advection, augmented by a considerable amount of sunshine with only patchy high clouds at times, will help temps recover back to or slightly above average on Saturday, with highs around 40/lower 40s in most areas. South-southwest winds persist Saturday night, keeping temps from falling off too much, with lows in the lower to middle 30s expected.

Ratzer

LONG TERM. 320 AM CST

Saturday night through Thursday .

The long term forecast period will start out relatively mild as the region will be under broad warm advection in swly flow between sfc high pressure over the Mid-Atlantic region and a sfc trough/cold front across the Central Plains. Lows Sunday morning should be in the lower 30s. Prevailing southwest flow will continue through the day on Sunday as the sfc trough/cold front progression slows, blocked by sfc ridging through the sern CONUS/ern GLFMX. Highs Sunday should be in the middle to upper 40s, with the chance for temps to reach 50 F, particularly for the far southern portions of the CWA. Pcpn associated with the approaching system may begin as early as late Sunday afternoon over the far nwrn portions of the CWA as the front approaches, but better chances for pcpn, mainly in the form of rain, will begin sunday night and continue into Monday night. As the cold front pushes across the region on Monday, winds will shift from swly to nwly through the afternoon, with strong cold advection setting up in the wake of the fropa. Temperatures should drop off quickly Monday night while nwly winds strengthen, with gusts of 25-30 mph likely. By Tuesday morning, temperatures will range from the middle teens northwest to the middle 20s southeast. Pcpn will transition from rain to snow as the colder air filters in behind the cold front, with some light accumulation possible. Following the passage of this system, the main forecast concern will be temperatures for the middle of next week. Latest long range guidance continues to suggest lows in the single digits across portions of the area north and west of a line from Chicago to Pontiac, with 10 to 12 F south and east of this line. There will likely be little moderation to temperatures as arctic high pressure slides across the area Wednesday and then settles into the Ohio Valley Thursday. With winds expected to remain arnd 10-15 mph, wind chill readings should be in the should may drop to -5 to -10 F for Tuesday and Wednesday morning. Conditions should begin to moderate by Thursday as the arctic high pushes into the sern CONUS and flow shifts to swly.

AVIATION. For the 18Z TAFs .

Aviation forecast concerns:

-North winds continuing to diminish this afternoon. -MVFR ceilings scatter to VFR early this afternoon.

Mid-day surface map depicts high pressure building eastward across the mid-Missouri Valley, in the wake of the cold front which pushed through the region overnight. Gusty northerly winds have steadily decreased since earlier this morning as the gradient slowly weakens, and this trend will continue this afternoon as the high approaches. Winds generally running 350-020 degrees, with speeds around/just above 10 kts currently which will continue to diminish over the next several hours. Surface ridge axis will move across the forecast area later this evening, allowing winds to become light and variable. MVFR stratocu deck at around 2500 feet is about to clear out of ORD/MDW/DPA per GOES visible satellite imagery. Clouds may linger into the afternoon at GYY, where the wind trajectory will remain off the lake, though bases will likely rise a bit. GYY will also see gusts linger a bit off the lake as well.

The surface high pressure ridge axis will shift southeast of the area by Saturday morning, with winds turning southerly (180-210 degrees) at 8-10 kts or so. VFR conditions will persist, with some occasional high clouds mainly north of the terminals associated with the upper level jet axis.

Ratzer

LOT WATCHES/WARNINGS/ADVISORIES. IL . None. IN . None. LM . Small Craft Advisory . IL nearshore waters until 6 PM Friday.

Small Craft Advisory . IN nearshore waters until midnight Saturday.



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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KNSW3 - Kenosha, WI 17 mi66 min NNE 15 G 18 33°F 1025.1 hPa (+0.4)
CHII2 - Chicago, IL 32 mi46 min N 12 G 13 35°F 25°F
CNII2 35 mi36 min N 7 G 15 38°F 23°F
CMTI2 - 9087044 - Calumet, IL 45 mi66 min NNW 12 G 16 35°F 1024.9 hPa (+1.2)26°F
MLWW3 - Milwaukee, WI 46 mi56 min N 9.9 G 9.9 35°F

Wind History for Calumet Harbor, IL
(wind in knots)    EDIT      (on/off)   Help
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S10
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G13
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G10
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G12
S5
G8
S6
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N10
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G18
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G27
NW16
G25
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G23
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G25
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G22
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G16
1 day
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W8
G16
W6
G17
W6
G13
W6
G11
W8
G15
W6
G10
W6
NW7
G12
W2
W3
SW3
SW3
SW5
SW5
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SW3
SW3
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S8
G11
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G12
2 days
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SW11
G18
SW12
G18
SW10
G18
SW6
G12
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G12
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G13
SW9
G15
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G12
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G11
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G11
SW8
G17
SW8
G14
SW7
G14
SW8
G13
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G12
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G16
SW10
G16
W8
G16
W5
G14
SW10
G18
W8
G15
W6
G17
W8
G18
W11
G18

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago/Waukegan Regional Airport, IL6 mi11 minNE 810.00 miFair36°F23°F59%1026.3 hPa
Kenosha, Kenosha Regional Airport, WI18 mi13 minNNW 810.00 miFair40°F21°F49%1026.1 hPa
Chicago / Wheeling, Pal-Waukee Airport, IL18 mi14 minNNW 710.00 miFair40°F21°F49%1026.5 hPa

Link to 5 minute data for KUGN

Wind History from UGN (wind in knots)
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Last 24hrS8SW5S4S6S4S7SW6SW7SW7SW55NW9
G17
NW6
G19
N11
G22
N9
G19
N11
G18
N9
G17
5N11
G17
N8
G19
N9
G17
N66NE8
1 day agoW9
G21
NW9
G23
NW7
G21
NW10
G17
NW6
G14
NW4CalmNW5W4W4W3CalmW3W33W3SW4W4CalmS3SW11S11S12S10
2 days agoSW11
G20
SW9
G20
SW7
G15
SW6W656W6W6W7W7W566--65W8W7
G19
W13
G25
NW11
G28
NW14
G26
NW10
G26
NW12
G25

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 (15,3,4,5)
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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.