Friday, April3, 2020
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L-36.com


Marine Weather and Tides
Lincolnwood, 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 6:27AMSunset 7:20PM Friday April 3, 2020 12:45 PM CDT (17:45 UTC) Moonrise 1:57PMMoonset 4:08AM Illumination 81% Phase: Waxing Gibbous; Moon at 11 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 Expires:202004032115;;510051 Fzus53 Klot 031413 Nshlot Nearshore Marine Forecast National Weather Service Chicago/romeoville Il 913 Am Cdt Fri Apr 3 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>742-032115- Winthrop Harbor To Wilmette Harbor- Wilmette Harbor To Northerly Island- Northerly Island To Calumet Harbor- 913 Am Cdt Fri Apr 3 2020
Rest of today..Southeast winds 5 to 10 kt becoming east winds 10 to 15 kt. Mostly cloudy. Waves 1 ft or less.
Tonight..Southeast winds 10 to 15 kt becoming northwest after midnight. A chance of showers after midnight. Waves 1 ft or less.
Saturday..Northwest winds 10 to 15 kt becoming north in the afternoon. Rain showers likely in the morning. Waves 1 to 3 ft.
Saturday night..North winds 10 to 15 kt. Partly cloudy in the evening then becoming mostly cloudy. Waves 1 to 3 ft.
LMZ741


7 Day Forecast for Marine Location Near Lincolnwood, IL
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location: 41.95, -87.63     debug


Area Discussion for - Chicago, IL
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FXUS63 KLOT 031108 AFDLOT

Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 608 AM CDT Fri Apr 3 2020

SHORT TERM. 329 AM CDT

Through Saturday .

Biggest forecast uncertainty today is with extent of cloud cover and the effect on temps. Guidance suggests that there will be some decrease in cloudiness today, particularly eastern CWA. Assuming some mixed sunshine, progged 925mb temps would support highs well into the 60s today. Exception will be downwind of the lake as southeasterly synoptic gradient should support a robust lake breeze this afternoon with much cooler temps near the lake and lake cooling spreading inland late in the afternoon.

Upper trough and associated surface front will move into the region tonight with pre-frontal band of rain showers spreading east across the CWA through the night. Upper trough is progged to lift north as it moves east, with progressively weaker large scale ascent with eastward extent, so should see some decrease in precip intensity and perhaps coverage as rain moves east overnight into Saturday morning.

In wake of rain on Saturday look for skies to clear out from the west, with cooler air mass in place in the wake of the cold front. Surface high will move into the western Great Lakes region and set the stage for another healthy lake breeze Saturday afternoon and evening, with much cooler temps (40s) expected near the lake.

- Izzi

LONG TERM. 329 AM CDT

Saturday night through Thursday .

Mid-upper level height rises expected Sunday into Monday as ridge develops of the mid section of the nation. Strengthening low level warm air advection regime ahead of northward advancing surface warm front should result in increasing chances of showers and probably some thunderstorms Monday into Monday night. GFS and ECMWF differ on the strength and track of surface low Tuesday, with the GFS stronger and farther north. The GFS solution would be a much warmer solution Tuesday with stout southerly winds holding any lake breeze at bay, likely allowing temps area-wide to potentially make a run at 70F. The ECMWF is weaker with the surface low and farther south with warm front getting hung up across central IL keeping an easterly component to the sfc flow and resulting in a substantial temps gradient from low 50s near the lake to near 70 southern/western CWA Tuesday. The ECMWF seems more probable this time of year, but didn't make any changes to the model blended guidance.

Shortwave progged to move across the region Tuesday night with another threat of showers and thunderstorms. Operational GFS and ECMWF both have a secondary (likely dry) cold frontal passage mid week with the threat of a healthier shot of cold air late in the week.

- Izzi

AVIATION. For the 12Z TAFs . 608 AM CDT

Light winds this morning will become decidedly southerly after sunrise as a meridional surface pressure gradient becomes established. Overcast skies are likely to become broken to scattered by mid-afternoon, allowing for a sufficient land/marine temperature differential to drive a lake breeze inland during the late afternoon hours. As such, winds at ORD/MDW/GYY will shift east/southeasterly at around 21/22/22Z, respectively, with the southerly wind ahead of the boundary possibly preventing further penetration to DPA. After sunset, winds will relax and become variable as the surface pressure field slackens in advance of an approaching cold front. The front will sweep across the terminals during the first half of the overnight period and shift winds northwesterly. A low- end MVFR/high end-IFR cloud deck will overspread the area in the wake of the front and last through much of the remainder of the TAF period. A few showers are also possible, but coverage and duration at this point look too spotty to warrant more than a TEMPO group with the outgoing TAF package (though confidence is highest at RFD right now given better forcing).

Borchardt

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

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
OKSI2 3 mi106 min ESE 5.1 G 7 47°F
CHII2 - Chicago, IL 4 mi26 min ENE 4.1 G 5.1 44°F 39°F
CNII2 7 mi16 min ENE 2.9 G 5.1 48°F 36°F
CMTI2 - 9087044 - Calumet, IL 16 mi46 min NE 5.1 G 7 46°F 1017.8 hPa (-0.4)39°F
MCYI3 - Michigan City, IN 41 mi26 min NNE 6 G 6 46°F 39°F
KNSW3 - Kenosha, WI 45 mi46 min S 4.1 G 5.1 44°F 1019 hPa (-0.3)

Wind History for Calumet Harbor, IL
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago, Chicago Midway Airport, IL13 mi53 minS 510.00 miMostly Cloudy66°F39°F39%1018 hPa
Chicago, Chicago-O'Hare International Airport, IL14 mi55 minVar 410.00 miMostly Cloudy64°F42°F45%1017.8 hPa
Chicago / Wheeling, Pal-Waukee Airport, IL18 mi54 minENE 310.00 miOvercast61°F41°F48%1018.6 hPa

Link to 5 minute data for KMDW

Wind History from MDW (wind in knots)
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Last 24hr--NE8
G16
E9E9--E8----E7E4E4E4CalmN3N3E6SW7E3E5SE3SE4S5S6S5
1 day agoN5N7NE11E10NE9E10E9NE4E5E5E4SE3E3CalmCalmCalmS3CalmCalmCalmCalmSE6E6SE4
2 days agoN10NE11NE11N13N11N11N10N12N10N9N12N7N9N8NW7N6N7N7N5N6N7N7N4NE3

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Chicago, IL (13,3,4,5)
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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.