Wednesday, October20, 2021
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Marine Weather and Tides
Niles, IL

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 7:08AMSunset 6:03PM Wednesday October 20, 2021 8:44 AM CDT (13:44 UTC) Moonrise 6:20PMMoonset 7:00AM Illumination 100% Phase: Full Moon; Moon at 14 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:202110201545;;971817 Fzus53 Klot 200855 Nshlot Nearshore Marine Forecast National Weather Service Chicago/romeoville Il 355 Am Cdt Wed Oct 20 2021 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>742-201545- Winthrop Harbor To Wilmette Harbor- Wilmette Harbor To Northerly Island- Northerly Island To Calumet Harbor- 355 Am Cdt Wed Oct 20 2021
.small craft advisory in effect from Thursday morning through late Thursday night...
Today..South winds 10 to 20 kt. Slight chance of showers and Thunderstorms in the afternoon. Waves 1 to 3 ft.
Tonight..South winds 10 to 20 kt becoming southwest 15 to 20 kt after midnight. Chance of showers and slight chance of Thunderstorms. Waves 1 to 3 ft.
Thursday..West winds 15 to 25 kt becoming northwest 20 to 25 kt in the afternoon. Chance of showers. Waves 2 to 4 ft building to 5 to 8 ft occasionally to 10 ft in the afternoon.
Thursday night..North winds 15 to 25 kt diminishing to 10 to 15 kt after midnight. Mostly cloudy. Waves 5 to 8 ft occasionally to 10 ft subsiding to 4 to 6 ft occasionally to 8 ft after midnight.
LMZ741


7 Day Forecast for Marine Location Near Niles, IL
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location: 42, -87.81     debug


Area Discussion for - Chicago, IL
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FXUS63 KLOT 201137 AFDLOT

Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 637 AM CDT Wed Oct 20 2021

SHORT TERM. 347 AM CDT

Through Thursday .

An upper-level wave and associated low pressure system will move in later this afternoon and bring chances for some isolated to scattered showers this afternoon into Thursday morning. However, lower level moisture return with this system will be rather poor, so this will not be a continuous rain, with lots of dry time likely. Precipitation totals will be less than a tenth of an inch in most areas. While precipitation should remain light and scattered in nature, the presence of rather steep mid-level lapse rates may support a few high based elevated thunderstorms this afternoon and evening ahead of an approaching cold front. For this reason we continue to mention some small chances for thunder in the forecast, though severe storms are not likely.

Scattered showers will continue to be possible into Thursday, especially in northeastern IL into northwestern IN as a secondary cold front drops southward down Lake Michigan along the western periphery of the surface low. Skies look to remain mostly cloudy on Thursday and the combination of cooler air behind the low and cloud cover will keep highs in the upper 50s to around 60 degrees.

Yack

LONG TERM.

Thursday night through Tuesday .

238 AM . Primary forecast concern and challenge is precip chances and timing for most of the period.

A secondary cold front will be south of the area Thursday evening as cooler air spreads across the region. There may still be some lingering showers/sprinkles across the eastern half of the cwa Thursday evening, but for now have maintained a dry forecast.

Winds will diminish quite a bit by Friday morning as a broad area of weak high pressure moves across the Great Lakes region. Low temps by Friday morning may reach into the mid 30s across some areas of northwest IL but low confidence for cloud cover trends. If clouds were to clear out, then frost would be possible for northwest areas Friday morning. It appears there will be a better chance for frost Friday night into Saturday morning across the northwest cwa as low temps drop into the lower 30s, along with light winds. Cloud cover trends are also a concern for this time period though there appears to be some potential for clearing skies behind a weak upper wave that will move across the area Friday afternoon/evening. Maintained patchy frost mention for this time period but if trends continue to support clearing skies, then a more widespread frost could be possible.

Saturday looks to be the better day of the weekend with easterly flow and dry weather expected. A storm system will develop in the central Plains Saturday night into Sunday. While there still remains large differences between the most recent ECMWF/GFS solutions, they do agree on increasing chances for rain and blended pops are now well into the likely range Sunday and made no changes. The differences are the GFS lifting the surface low into the western Great Lakes Monday, ending the precip for the area while the ECMWF takes the surface low generally east, developing an upper low that doesn't shift east of the area until Tuesday. The uncertainty is high for this time period, not just for precip chances but also temps. The blended temps, which are mid/upper 60s Monday and lower 70s Tuesday, could end up being several degrees too warm. cms

AVIATION. For the 12Z TAFs .

637 AM . Forecast concerns include .

Low chance for isolated thunderstorms this afternoon/evening. Mvfr cigs Thursday morning.

No significant changes from the previous forecast. Light southerly winds will increase into the 10-12kt range by late morning with directions turning more south/southwest. Gust to 20kts or so will be possible this afternoon and are expected to diminish with sunset, but low level winds will continue to increase this evening, possibly leading to low level wind shear but also the potential for some gusts to continue into the evening, especially for the Chicago terminals. A cold front will move across the area early Thursday morning, shifting winds to the west/southwest and some gusts will be possible overnight. Winds will turn more westerly after daybreak Thursday morning with a second cold front expected to move across the terminals late Thursday morning or early Thursday afternoon. This second front will shift winds more northerly.

There will be a chance for a few showers/sprinkles late this afternoon through late this evening. During this time period, there will also be a low chance for a few isolated thunderstorms. Confidence for thunder occurring is low and if any thunder does develop, the duration would be fairly short. So continued with no thunder mention with this forecast. Early Thursday morning appears to be mainly dry with another chance for showers after daybreak Thursday ahead of the second cold front noted above.

Much of the guidance develops mvfr cigs across northwest IL in the predawn hours Thursday morning and then spreads the mvfr cigs across the rest of the area mid/late Thursday morning. cms

LOT WATCHES/WARNINGS/ADVISORIES. IL . None. IN . None. LM . Small Craft Advisory . LMZ740-LMZ741-LMZ742-LMZ743-LMZ744- LMZ745 . 7 AM Thursday to 4 AM Friday.



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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
OKSI2 12 mi165 min W 5.1G11 60°F
45174 12 mi45 min SSW 9.7G14 63°F1 ft1017.5 hPa (-0.2)
CHII2 - Chicago, IL 14 mi55 min S 14G15 58°F 48°F
CNII2 15 mi45 min W 7G8.9 56°F 45°F
JAKI2 20 mi165 min WSW 7G9.9 56°F
CMTI2 - 9087044 - Calumet, IL 24 mi93 min SSW 6G9.9 1017.2 hPa
WHRI2 - Waukegan Harbor, IL 25 mi105 min SW 6G8
45187 34 mi45 min S 3.9G5.8 58°F 62°F1 ft
KNSW3 - Kenosha, WI 41 mi105 min SW 6G8 55°F 1017.6 hPa
BHRI3 - Burns Harbor, IN 43 mi65 min S 7G8.9 54°F 1019.3 hPa

Wind History for Calumet Harbor, IL
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago, Chicago-O'Hare International Airport, IL5 mi54 minS 510.00 miA Few Clouds54°F47°F77%1017.9 hPa
Chicago / Wheeling, Pal-Waukee Airport, IL9 mi53 minS 510.00 miFair55°F47°F74%1018.4 hPa
Chicago, Chicago Midway Airport, IL15 mi52 minSSW 610.00 miA Few Clouds55°F44°F67%1018.2 hPa
Chicago / West Chicago, Dupage Airport, IL24 mi53 minS 410.00 miFair50°F46°F86%1018.2 hPa

Link to 5 minute data for KORD

Wind History from ORD (wind in knots)
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Last 24hrSW8S5SW6SW5SW6SW10
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S7S9S7S5S5S6S5S6S6S5SW6SW7SW6SW6S4S5
1 day ago0SW6SW4SW6SW4SW9
G15
W6SW9SW7SW4S4S4S4S4S4S6S5SW7SW9SW8SW6SW7SW6SW4
2 days agoW5W54W8
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W10W8W5W4SW3W5W6W4W5W40W300000

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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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