Tuesday, December1, 2020
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L-36.com

Marine Weather and Tides
Lake Bluff, IL

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
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 6:58AMSunset 4:21PM Monday November 30, 2020 11:05 PM CST (05:05 UTC) Moonrise 5:40PMMoonset 8:09AM Illumination 99% Phase: Waning Gibbous; Moon at 16 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- 949 Pm Cst Mon Nov 30 2020
.gale warning in effect until midnight cst tonight...
Rest of tonight..Northwest gales to 35 kt easing to northwest winds 20 to 25 kt. A chance of flurries. Waves 8 to 11 ft occasionally to 14 ft subsiding to 6 to 9 ft occasionally to 12 ft after midnight.
Tuesday..Northwest winds 20 to 25 kt. Sunny. Waves 4 to 7 ft occasionally to 9 ft subsiding to 4 to 6 ft occasionally to 8 ft in the afternoon.
Tuesday night..Northwest winds 10 to 20 kt. Mostly clear. Waves 3 to 5 ft.
Wednesday..West winds 10 to 15 kt. Sunny. Waves 2 to 4 ft subsiding to 1 to 3 ft in the afternoon.
LMZ740 Expires:202012011015;;655500 FZUS53 KLOT 010349 CCA NSHLOT NEARSHORE MARINE FORECAST...CORRECTED National Weather Service Chicago/Romeoville IL 949 PM CST Mon Nov 30 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>742-011015-


7 Day Forecast for Marine Location Near Lake Bluff, IL
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location: 42.28, -87.83     debug


Area Discussion for - Chicago, IL
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FXUS63 KLOT 010456 AFDLOT

Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 1056 PM CST Mon Nov 30 2020

UPDATE. 934 PM CST

We have had reports of a glaze of ice in portions of Porter county Indiana. Investigation of forecast and AMDAR soundings suggests that we are losing some of the deeper moisture that is allowing supercooled water to dominate in the clouds across Lake Michigan, and this is resulting in freezing drizzle or freezing rain to mix in with the snow.

Fortunately forcing is easing some and precipitation should lighten up with time, though freezing drizzle may continue through the night and even into the morning commute. Therefore, we have updated the winter weather advisory to reflect that the higher impacts will be from ice than snow. Travelers in northwest Indiana should use caution this evening and overnight.

KMD

SHORT TERM. 237 PM CST

Through Tuesday night .

Main update for this afternoon is that we decided to drop the winter weather advisory for Lake and Jasper counties but keep it going for Porter. Even most of Porter has been seeing very little activity so far today as the dominant lake effect snow band remains parked to the east over La Porte and Starke counties. Confidence is not high that Porter even sees much this evening or overnight, but if the band shifts west or if it breaks down and allows for development of less organized multi-band snow showers across the area, a quick couple of inches would not be out of the question. Areas of Lake and Jasper also could still see some light accumulations, but based on trends so far today, this is looking less likely to cause problems widespread enough to justify keeping the advisory tonight.

Tuesday morning, as winds continue backing toward the northwest, only the far northeast corner of Porter County would be favored for any additional snowfall, and this would be very light. Most locations on the Illinois side and close to the Indiana stateline actually should be clear by morning ahead of a ridge building in from the west. The tradeoff is overnight lows in the upper teens to lower 20s, compared to upper 20s in areas with continued cloud cover and snow chances early tomorrow.

By Tuesday afternoon sunny skies should spread across the area, and despite continued northwest flow we should manage to climb into the mid to upper 30s in most locations, though winds gusting to around 20 mph will make it feel about 10 degrees cooler. Tuesday night with lighter winds and clear skies, overnight lows again drop into the low to mid 20s, close to normal for early December.

Lenning

LONG TERM. 237 PM CST

Wednesday through Monday .

The local area will be between the departing low to the east and another upper low digging into the southern high plains. The western part of this trough will cutoff over the Four Corners while the eastern portion continues eastward and is absorbed by the northern stream trough centered over eastern Canada. The southeast part of the forecast area will be on the fringe of the trough as it weakens as it passes Thursday and Thursday night. The signal continues to be dry as this occurs so will stay with that idea for now. Once the trough clears, the area will be influenced by a brief period of upper ridging into Friday night before another northern stream trough digs southward into the upper Great Lakes Saturday and into the upper Ohio Valley into Sunday. Not too much in the way of deeper moisture is forecast locally, with the core of the system staying to the east at this point but will need to keep an eye precip potential as the weekend gets closer. Highs will be fairly steady from midweek onward with readings in the low to mid 40s. Overnight lows will be in the 20s. Another brief round of colder air will spread in for Monday bringing the potential for highs in the 30s should it come to pass.

MDB

AVIATION. For the 06Z TAFs .

A lake-enhanced stratus deck from ~3000 to 5000 feet will gradually slosh eastward as cloud-layer winds turn northwesterly overnight. With aircraft soundings confirming the presence of supercooled liquid through much of the cloud layer, icing will remain a hazard through the overnight hours especially over Lake Michigan. The cloud deck should break at ORD/MDW/DPA between 9-11Z, and GYY closer to 18Z. Northwest winds will prevail through the TAF period with magnitudes decreasing with time. Flurries remain possible overnight, though no impacts are expected. Toward the end of the TAF period, high clouds will move in from the west.

Borchardt

LOT WATCHES/WARNINGS/ADVISORIES. IL . Lakeshore Flood Advisory . ILZ103-ILZ104 until 6 AM Tuesday.

IN . Lakeshore Flood Warning . INZ001-INZ002 until noon Tuesday.

Winter Weather Advisory . INZ002 until 6 AM Tuesday.

LM . Gale Warning . nearshore waters until midnight Tuesday.



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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WHRI2 - Waukegan Harbor, IL 6 mi126 min NW 16 G 22 28°F
KNSW3 - Kenosha, WI 21 mi66 min NW 12 G 18 29°F 1015.9 hPa
FSTI2 23 mi126 min 29°F
OKSI2 28 mi126 min NNW 2.9 G 8 31°F
CHII2 - Chicago, IL 29 mi46 min NW 22 G 25 30°F 21°F
CNII2 32 mi36 min WNW 11 G 18 30°F 19°F
CMTI2 - 9087044 - Calumet, IL 41 mi48 min WNW 7 G 14 29°F 1014.6 hPa18°F

Wind History for Calumet Harbor, IL
(wind in knots)    EDIT      (on/off)   Help
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NW13
G19
NW16
G24
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G28
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G28
N19
G26
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G27
NW17
G26
NW15
G22
NW11
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G18
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S8
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G12
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G12
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G15
SW8
G13
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G13
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G14
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G13
SW7
G11
SW4
G9
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G11
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G8
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G11
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G26
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G21
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G9
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G12
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G15
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G14
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G20
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G18
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G15
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G17
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G18
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G17
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G19
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G16
S9
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G12

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago/Waukegan Regional Airport, IL10 mi71 minNW 10 G 1810.00 miOvercast29°F16°F58%1016.9 hPa
Chicago / Wheeling, Pal-Waukee Airport, IL12 mi74 minNNW 1210.00 miOvercast30°F16°F56%1017.1 hPa
Chicago, Chicago-O'Hare International Airport, IL21 mi75 minNW 13 G 2110.00 miOvercast29°F17°F61%1016.5 hPa
Kenosha, Kenosha Regional Airport, WI22 mi73 minNNW 9 G 2010.00 miOvercast30°F16°F56%1016.9 hPa

Link to 5 minute data for KUGN

Wind History from UGN (wind in knots)
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Last 24hrNW8
G19
N10
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--N8
G18
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G19
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G22
N14
G25
N8
G18
N12
G24
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G26
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G27
N13
G24
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NW9
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G22
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--NW10
G19
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G21
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1 day agoSW11SW11SW11SW10SW10SW10SW9SW10SW11SW9
G18
SW13SW9
G19
W6
G16
W6W535NW10
G21
NW8
G16
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--NW7
G15
2 days agoW5W53CalmSW4SW6SW6SW7SW8SW12SW12
G20
SW16SW13SW16SW15SW17SW12
G21
SW15SW15
G23
SW13SW15
G21
SW12SW14
G22
SW11
G20

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
Ground Weather Radar Station Chicago, IL
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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 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.