Thursday, April2, 2020
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Marine Weather and Tides
Evanston, 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 6:28AMSunset 7:19PM Thursday April 2, 2020 5:27 AM CDT (10:27 UTC) Moonrise 12:47PMMoonset 3:22AM Illumination 69% Phase: Waxing Gibbous; Moon at 9 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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LMZ741 Wilmette Harbor To Northerly Island- Northerly Island To Calumet Harbor- 348 Am Cdt Thu Apr 2 2020
.dense fog advisory in effect until 10 am cdt this morning...
Today..Variable winds around 5 kt this morning becoming east around 10 kt. Areas of dense fog this morning. Waves 1 ft or less.
Tonight..East winds 5 to 10 kt. Slight chance of showers after midnight. Waves 1 ft or less.
Friday..Southeast winds 10 to 15 kt. Partly Sunny. Waves 1 ft or less.
Friday night..Southeast winds 5 to 10 kt becoming south after midnight. Rain showers likely. Waves 1 ft or less.
LMZ741 Expires:202004021500;;446274 FZUS53 KLOT 020848 NSHLOT NEARSHORE MARINE FORECAST National Weather Service Chicago/Romeoville IL 348 AM CDT Thu Apr 2 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. LMZ741-742-021500-


7 Day Forecast for Marine Location Near Evanston, IL
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location: 42.03, -87.69     debug


Area Discussion for - Chicago, IL
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FXUS63 KLOT 020915 AFDLOT

Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 415 AM CDT Thu Apr 2 2020

SHORT TERM. 355 AM CDT

Through Tonight .

Focus in the near term is on dense fog which has developed overnight near the lake and inland across parts of northwest Indiana and the southern Chicago metro area. Have expanded the dense fog advisory slightly to include areas south of the Kankakee River valley in northwest Indiana, and farther west across Will county in the south/southwest suburbs.

A combination of webcam imagery, surface obs and GOES IR satellite imagery indicates an area of low clouds and dense fog across far southern Lake Michigan and parts of adjacent northwest IN and southern Chicago metro early this morning. Fog appears to be pretty shallow in downtown cams with a view of the lake shore, with not much inland push into the heart of the city. High-res guidance has captured the fog threat fairly well, though it may be over-forecasting the inland push across the central portions of the metro area this morning. Low level east-southeast flow would support an expansion of fog across the city and west suburbs as depicted by RAP/HRRR and other guidance, though at this time fog appears to be shallow enough to be limited to the immediate surface wind field which is light/variable. Have updated to include more of Will county in the dense fog advisory, as well as Newton and Jasper counties in northwest Indiana were it fog has spread south of the Kankakee river, but with slower westward movement held off on central Cook/DuPage counties and will just have to monitor for any possible further expansion there. Shallow nature of the fog does suggest it will burn off fairly quickly this morning.

Otherwise, quiet weather is on deck for today with ridging aloft, and a gradual increase in southeast winds. After fog burns off this morning, expecting patchy mid/high clouds at times from a weak short wave west of the upper ridge axis. Partly sunny conditions should support temperatures warming to around 60/lower 60s west and south of the city, while southeast winds off the lake maintain cooler temps with upper 40s along the immediate shore.

Mid-level short wave west of the area today ripples overhead tonight, with a brief period of enhanced warm/moist advection and isentropic ascent which produces some mid-level saturation. Several models develop some light spotty QPF across parts of far northern IL, though dry low levels and relatively weak forcing suggests this should be limited to some scattered lighter showers and sprinkles overnight.

Ratzer

LONG TERM. 415 AM CDT

Friday through Wednesday .

Weak mid-level short wave which moves into the upper ridge across the area Thursday night will exit the area Friday morning, with the upper ridge strengthening downstream of deeper troughing advancing across the northern Plains. This will set the stage for a mainly dry day, with low level south-southeasterly flow providing a continued warm-up. Mid and high level cloud cover will remain in place in at least patchy fashion during the morning, and some sunshine will aid in warming temps into the low-mid 60s in most areas. A slight southeast component to surface winds will continue to keep the IL lake front cooler however. Scattered shower chances slowly increase from the west by late afternoon across northwest IL as a cold front drifts toward the Mississippi River from the west. A more substantial rain threat spreads east across the area Friday night, as the front pushes into the area. While better mid/upper level forcing passes north of the area, weak height falls do develop atop the low level frontal zone and narrow low-level moisture axis along and ahead of the front. In addition, a plume of steeper mid-level lapse rates (6.5-7.0 C/km) spreads across the area overnight, with some guidance depicting some modest 100-200 J/kg elevated CAPE for parcels originating above 800 mb. This may support a few embedded rumbles of thunder overnight especially across the western and southern parts of the cwa where the steep lapse rate plume is better established.

The cold front continues its slow east-southeastward trek across the forecast area Saturday, with rain gradually ending across north central IL by early afternoon and across all but areas generally east of I-55 by evening. Far southeastern parts of the cwa may see showers linger Saturday night as the front slows up. Surface high pressure builds across the area Sunday, and should provide a dry day to finish out the weekend.

Medium range guidance continues to develop a long wave trough along the west coast early next week, with a broad downstream upper ridge across the eastern CONUS. With quick southwesterly flow aloft, surface low pressure is progged to develop out of the Plains and progress northeast to the western Great Lakes region through mid-week. In the process, a warm front lifts across the region, bringing warmer (potentially 70+ degrees) and more humid air into the region. Shower and thunderstorm potential also increases, with a few periods of unsettled weather likely Monday into Wednesday.

Ratzer

AVIATION. For the 06Z TAFs .

1231 AM . Primary forecast concern is dense fog and low clouds through mid morning.

Dense fog across northwest IN and far northeast IL will slowly spread west/northwest through the overnight hours. Dense fog is likely at both ord and mdw and for now have only included in a tempo but as trends emerge its likely prevailing dense fog may be needed . especially at mdw. This fog appears to be fairly shallow and much of the guidance burns this fog off quickly after sunrise. Only medium confidence for this quick improvement so changes are possible with later updates Once the fog dissipates. just mid/ high clouds expected for the rest of the period. Fog may also persist over the lake into this afternoon.

Light easterly winds may become light and variable early this morning and then will become light southeasterly later this morning. A lake breeze may shift winds more easterly with speeds increasing to 10kts in the afternoon with light southeast winds tonight.

There may be a few light showers across northwest IL this evening and at rfd. Confidence is fairly low but may need to add some mention with later forecasts. cms

LOT WATCHES/WARNINGS/ADVISORIES. IL . Dense Fog Advisory . ILZ014-ILZ022-ILZ105-ILZ106-ILZ107-ILZ108 until 9 AM Thursday.

IN . Dense Fog Advisory . INZ001-INZ002-INZ010-INZ011 until 9 AM Thursday.

LM . Dense Fog Advisory . Wilmette Harbor to Michigan City IN until 10 AM Thursday.



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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
OKSI2 9 mi147 min Calm G 1 38°F
CHII2 - Chicago, IL 10 mi37 min SE 1 G 1 32°F 32°F
CNII2 13 mi42 min Calm G 2.9 32°F 31°F
CMTI2 - 9087044 - Calumet, IL 22 mi57 min NNE 1 G 1.9 32°F 1020.5 hPa32°F
KNSW3 - Kenosha, WI 39 mi87 min WNW 2.9 G 4.1 35°F 1021 hPa (+0.3)
MCYI3 - Michigan City, IN 46 mi37 min N 1 G 1 32°F 32°F

Wind History for Calumet Harbor, IL
(wind in knots)    EDIT      (on/off)   Help
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W5
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago / Wheeling, Pal-Waukee Airport, IL12 mi35 minN 010.00 miFair34°F30°F89%1022 hPa
Chicago, Chicago-O'Hare International Airport, IL12 mi36 minN 010.00 miFair36°F32°F86%1021.1 hPa
Chicago, Chicago Midway Airport, IL17 mi34 minS 310.00 miA Few Clouds34°F33°F97%1021.9 hPa

Link to 5 minute data for KPWK

Wind History from PWK (wind in knots)
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Last 24hrN6N5N533NE6NE6NE7NE6E8NE6NE8NE8E5NE5E4CalmCalmCalmCalmCalmCalmCalmCalm
1 day agoN7N8N5N9NE8NE6N8N10NE10
G19
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N9N10N8N5NE7N8N5N5N6NW5N6N6
2 days agoNW12
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W7NW9NW11NW13
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NW14NW9
G19
NW9N6E5NE5E7SE4E3E5NE4E7NE7N6N6N9
G17
N8N5

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 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.
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Wind Forecast for Chicago, IL (6,6,7,8)
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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.