Tuesday, September22, 2020
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L-36.com

Marine Weather and Tides
Lake Forest, 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 6:38AMSunset 6:49PM Tuesday September 22, 2020 12:16 AM CDT (05:16 UTC) Moonrise 12:55PMMoonset 10:23PM Illumination 24% Phase: Waxing Crescent; Moon at 5 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- 919 Pm Cdt Mon Sep 21 2020
Rest of tonight..Southeast winds around 10 kt becoming southwest overnight. Partly cloudy. Waves around 1 ft.
Tuesday..Southwest winds 5 to 10 kt becoming south in the afternoon. Partly cloudy. Waves 1 ft or less.
Tuesday night..Southwest winds 5 to 10 kt. Partly cloudy. Waves 1 ft or less.
Wednesday..Southwest winds 5 to 10 kt increasing to 10 to 15 kt in the afternoon. Mostly Sunny. Waves 1 ft or less.
LMZ740 Expires:202009221130;;174180 FZUS53 KLOT 220219 NSHLOT NEARSHORE MARINE FORECAST National Weather Service Chicago/Romeoville IL 919 PM CDT Mon Sep 21 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>742-221130-


7 Day Forecast for Marine Location Near Lake Forest, IL
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location: 42.24, -87.86     debug


Area Discussion for - Chicago, IL
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FXUS63 KLOT 220457 AFDLOT

Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 1157 PM CDT Mon Sep 21 2020

SHORT TERM. 133 PM CDT

Through Tuesday night .

With a surface high pressure system position to our east, low pressure system toward the north, and weak low to upper-level tropospheric flow, persistence is the way to go for the forecast through at least Wednesday. Lows tonight and highs tomorrow will be a few degrees more than last night/today, and surface winds will remain relatively light out of the south to southwest. Experimental HRRR vertical integrated smoke indicates upper-level smoke will continue to stream overhead through the foreseeable future, so will also maintain wording for partial sky cover through at least Wednesday morning.

Borchardt

LONG TERM. 253 PM CDT

Wednesday through Monday .

The generally tranquil and mild pattern will finally come to an end this weekend with a frontal passage Saturday evening and night. A cool and unsettled pattern could then unfold next work week.

Wednesday will have a combination of increased high clouds and likely lingering smoke aloft from western wildfires, but as 925 mb temps rise into the upper teens Celsius, dry air mass should still be conducive to warming into the upper 70s to around 80 for highs. Thursday afternoon should also be primarily dry with similar to maybe a hair cooler temperatures. There will be a fairly complex pattern aloft with a short-wave trough rounding western and central CONUS ridging. The ECMWF shears out the wave less and even closes off 500 mb low for a time. If this general idea verifies, some isolated to scattered showers may be possible in the northwest CWA later in the afternoon into the evening. For now, maintained dry NBM forecast.

The Thursday PM-night short-wave could then serve to effectively block off moisture trajectories from tropical remnants to get involved with Saturday evening and night's frontal passage. At this vantage point, Friday through Saturday afternoon appears dry and mild/warm with highs around 80F on Friday and low to possibly mid 80s on Saturday in breezy southwest flow immediately ahead of the front. As mentioned, the moisture return on Saturday will be lacking, so we might eek out a ribbon of dew points a couple degrees either side of 60F. In addition, while there is time for change in this, the current timing of large scale forcing from stout digging trough and surface cold front is diurnally unfavorable, happening primarily after sunset Saturday evening. There will be enough forcing for at least scattered showers with the front, but lacking instability and unfavorable timing should limit thunder coverage to isolated/slight chance.

There's pretty decent agreement for this far out that Sunday will be between waves behind the cold front, so should be mostly dry, and therefore collaborated PoPs downward to mainly slight chance. Temperatures will step down to the lower to mid 70s, so still could turn out a decent day. Medium-long range operational and ensemble guidance is in good agreement in an impressive long-wave trough setting up shop over the eastern CONUS (including Midwest) next work week. Details of how we get there are a bit muddled to start the work week. Impressive short-wave that will carve out this trough could spur deep cyclogenesis over the Great Lakes region on Monday and exact position of mass fields would determine if we have a breezy/windy, wet and cool Monday, or just breezy and lower rain/shower coverage if main forcing for precip passes just north and east. For now, the lower-end NBM PoPs appear reasonable. At least a few days of below to well below normal temperatures appear likely behind Monday's (day 7) secondary cold front passage.

Castro

AVIATION. For the 06Z TAFs .

VFR conditions with winds under 10 knots from the SW quadrant are expected through the period. SCT clouds around 15 kft will filter across the area at times. Meanwhile, smoke from wildfires across the western U.S. will continue to drift over the region. Per HRRR forecast guidance and PIREPs over the past 24 hours, visibility restrictions begin as low as 4-5 kft, with greater concentrations from 6-10 kft. This is noted as SCT080 in the TAF.

Kluber

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
WHRI2 - Waukegan Harbor, IL 9 mi76 min SSW 5.1 G 6
45174 13 mi16 min S 7.8 G 12 67°F 65°F1 ft1023.7 hPa54°F
45187 18 mi16 min SW 3.9 G 5.8 62°F 63°F1 ft
KNSW3 - Kenosha, WI 24 mi136 min S 4.1 G 7 63°F 1024 hPa (+0.0)
OKSI2 26 mi76 min Calm G 1 69°F
CHII2 - Chicago, IL 27 mi26 min S 17 G 19 67°F 49°F
CNII2 30 mi16 min SSW 6 G 9.9 64°F
CMTI2 - 9087044 - Calumet, IL 39 mi46 min SSW 4.1 G 6 64°F 1024.1 hPa46°F

Wind History for Calumet Harbor, IL
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago / Wheeling, Pal-Waukee Airport, IL9 mi24 minN 010.00 miFair57°F52°F83%1024.4 hPa
Chicago/Waukegan Regional Airport, IL12 mi21 minSW 37.00 miFair54°F52°F93%1023.4 hPa
Chicago, Chicago-O'Hare International Airport, IL18 mi25 minS 510.00 miPartly Cloudy62°F48°F60%1023.8 hPa

Link to 5 minute data for KPWK

Wind History from PWK (wind in knots)
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Last 24hrCalmCalmCalmS4SE3CalmSE4S3S7S7
G16
S10S10S9S9S6SE8S7S6SE4CalmCalmCalmCalmCalm
1 day agoCalmCalmCalmCalmCalmCalmCalmCalmS5SE9SE8SE9
G18
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SE7SE9E8E5E4E3CalmCalmCalmCalm
2 days agoCalmCalmN3N3S8CalmCalmCalmS5S3S6Calm3W4E7E10
G15
E8E6E4CalmCalmCalmCalmCalm

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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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.