Thursday, August13, 2020
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Marine Weather and Tides
North Chicago, 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 5:55AMSunset 7:56PM Thursday August 13, 2020 8:18 PM CDT (01:18 UTC) Moonrise 12:32AMMoonset 3:43PM Illumination 24% Phase: Waning Crescent; Moon at 25 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- 253 Pm Cdt Thu Aug 13 2020
Tonight..Northeast winds 5 to 10 kt. Mostly clear. Waves 1 to 2 ft.
Friday..Northeast winds 5 to 10 kt increasing to 10 to 15 kt in the afternoon. Sunny. Waves 1 to 2 ft.
Friday night..Northeast winds 5 to 10 kt becoming southeast after midnight. Partly cloudy. Waves 1 ft or less.
Saturday..South winds around 5 kt becoming east in the afternoon. Slight chance of showers and Thunderstorms in the afternoon. Waves 1 ft or less.
LMZ740 Expires:202008140315;;400687 FZUS53 KLOT 131953 NSHLOT NEARSHORE MARINE FORECAST National Weather Service Chicago/Romeoville IL 253 PM CDT Thu Aug 13 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>742-140315-


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 132327 AFDLOT

Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 627 PM CDT Thu Aug 13 2020

SHORT TERM. 131 PM CDT

Through Friday night .

Quiescent pattern continues through the end of the week here with the region hanging out in the more subsident regime immediately north of a slow-moving upper low across southern Illinois. Can't rule out some light/patchy fog tonight, but this would mainly be for locales west of Chicago where dewpoints remain the highest. No formal mention in the gridded products at this time, however, given the anticipated localized and ephemeral nature of any fog development.

Tomorrow looks much the same as today, with high temperatures around a degree or two warmer than today. Can't rule out a stray shower developing in our far southeastern locales as the upper low starts to jog a bit more northeastward, but any chances seem to be under 10% or so with no mention in the gridded forecast. A cold front will approach the region from the northwest late Friday night, but any associated shower and thunderstorm chances look to hold off until later on Saturday.

Carlaw

LONG TERM. 211 PM CDT

Saturday through Thursday .

Overall the period will feature fairly quiet weather. The only exception to this is the continued chance for a period of showers and thunderstorms late Saturday through Saturday evening. Additionally, as mentioned in previous discussions, we will have to monitor the potential for dangerous swimming conditions on Lake Michigan early next week due to some enhanced northerly winds down the lake.

Saturday will be another warm day across the area, with temperatures likely to top out well into the 80s. A surface cold front, associated with a potent area of low pressure over northern Ontario, is expected to shift eastward over the area sometime during the day. As it approaches, a warming prefrontal airmass along with some pooling of higher dew points near the frontal zone on Saturday afternoon could support a corridor featuring MLCAPE values in excess of 1,000 J/KG. Therefore, there is some concern for convective development with the front over the area Saturday afternoon. However, there are some signals that the better upper support from an approaching mid-level disturbance and the exit region of an upper jet may lag the frontal boundary and the better diurnal timing some, thus possibly limiting the areal coverage of storms over the area during the day. While questions still remain with the extend of storms late Saturday, the chances continue, with a favored timing centered around the Saturday afternoon through early evening. The threat of severe storms with this activity will not be zero, but limited deep layer shear and the possibilities for a lower areal coverage of storms should limit the extent of severe storms over the area.

Behind the cold front, northwest winds will take over and a secondary front looks to push over the area sometime late in the weekend. If that timing holds, Sunday is likely to be dry CWA- wide. Behind the secondary front, highs look to drop into the mid-upper 70s Monday and Tuesday. As for the northerly winds, the duration of them into especially northwest Indiana may be enough for a rip current threat and possibly into Cook County as well during Sunday into Monday.

We maintain a dry forecast for next week. The northwest flow may not be void of disturbances, and 00Z long range guidance did show hints of a low amplitude feature passing nearby or overhead in the Tuesday-Wednesday period, but confidence is much too low to deviate from a dry forecast at this juncture.

KJB/MTF

AVIATION. For the 00Z TAFs .

627 PM . No forecast concerns through the period. Easterly winds to 10kts will diminish this evening . possibly becoming light and variable. Winds may favor a light northerly direction for ord/mdw overnight. Winds will turn back easterly Friday morning and increase to 10kts Friday afternoon. cms

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 1 mi79 min NE 8 G 9.9 75°F
45187 10 mi39 min ENE 5.8 G 7.8 76°F 75°F1 ft
45174 16 mi19 min NNE 7.8 G 7.8 75°F 75°F1 ft1017.6 hPa (+0.0)68°F
KNSW3 - Kenosha, WI 17 mi79 min NNE 8.9 G 8.9 76°F 1017.6 hPa (-0.3)
CHII2 - Chicago, IL 32 mi29 min NNE 8.9 G 9.9 76°F 71°F
OKSI2 32 mi139 min ENE 5.1 G 7 76°F
CNII2 35 mi34 min NNE 6 G 12 73°F 66°F
CMTI2 - 9087044 - Calumet, IL 45 mi49 min N 4.1 G 8 75°F 1017.4 hPa69°F
45007 - S MICHIGAN 43NM East Southeast of Milwaukee, WI 46 mi29 min NNE 9.7 G 12 74°F 1 ft1017.9 hPa71°F
MLWW3 - Milwaukee, WI 46 mi39 min NE 2.9 G 4.1 74°F

Wind History for Calumet Harbor, IL
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago/Waukegan Regional Airport, IL6 mi24 minN 010.00 miFair72°F63°F73%1017.1 hPa
Kenosha, Kenosha Regional Airport, WI18 mi26 minENE 410.00 miFair71°F61°F71%1018.2 hPa
Chicago / Wheeling, Pal-Waukee Airport, IL18 mi27 minNE 310.00 miFair77°F64°F66%1018 hPa

Link to 5 minute data for KUGN

Wind History from UGN (wind in knots)
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Last 24hrCalmCalmCalmE3CalmCalmCalmCalmN3CalmCalmCalmNE5E6E65E6E7E7E6NE7NE6NE4Calm
1 day agoSW3CalmCalmCalmCalmCalmW3CalmW5NW5NW3NW3Calm4S5SE7SE7SE5SE7E8E6NE5E6NE4
2 days agoW4663W653W4NW4N4N5NW43NW3NE3CalmE5E8E5SE6E6SE6SE3Calm

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 (21,6,7,8)
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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.