Tuesday, September22, 2020
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L-36.com

Marine Weather and Tides
Libertyville, 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 7:28 AM CDT (12:28 UTC) Moonrise 12:56PMMoonset 10:23PM Illumination 27% 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- 322 Am Cdt Tue Sep 22 2020
Today..Southwest winds around 10 kt becoming south-southeast in the afternoon. Mostly Sunny. Waves 2 ft or less.
Tonight..West winds 5 to 10 kt. Partly cloudy. Waves 1 ft or less.
Wednesday..West winds 5 to 10 kt becoming southwest in the late morning and afternoon. Mostly Sunny. Waves 1 ft or less.
Wednesday night..Southwest winds 10 to 15 kt. Partly cloudy. Waves 1 ft or less.
LMZ740 Expires:202009221545;;185520 FZUS53 KLOT 220822 NSHLOT NEARSHORE MARINE FORECAST National Weather Service Chicago/Romeoville IL 322 AM CDT Tue Sep 22 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>742-221545-


7 Day Forecast for Marine Location Near Libertyville, IL
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location: 42.29, -87.95     debug


Area Discussion for - Chicago, IL
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FXUS63 KLOT 221102 AFDLOT

Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 602 AM CDT Tue Sep 22 2020

SHORT TERM. 230 AM CDT

Through Wednesday .

Dry and mild weather will persist through mid-week to begin autumn.

Early morning GOES water vapor imagery displays a mid-level short wave trough tracking east across the upper Midwest. The strongest forcing with this disturbance will remain well north of the forecast area, with only some patchy mid-level clouds across far northern IL this morning. We'll also see more patchy cirrus today, as upper level moisture along the northern periphery of tropical storm Beta interacts with a developing jet steak, which along with the persistent presence of smoke from western fires will make for generally partly cloudy skies. Thermodynamic profiles remain otherwise quite dry however, and combined with modest south- southwesterly low level winds and 925 mb temps in the +16 to +18C range should result in mild temps in the upper 70s to around 80 degrees this afternoon.

Similar conditions will remain in place across the region Wednesday, though with a little more high cloud cover especially across our southern cwa as a mid-level trough drifts slowly east across the lower Missouri and lower Ohio Valley regions.

Ratzer

LONG TERM. 230 AM CDT

Wednesday night through Monday .

Dry and mild weather pattern is expected to persist through the end of the week, before a cold front pushes across the area late Saturday. Much cooler and potentially unsettled weather is then expected into next week, as a deep long wave trough evolves across eastern North America.

A mid-level short wave is progged to top the western ridge Wednesday night, and dig southeast into the Midwest by Thursday night. The ECMWF remains the deepest with this feature, though pretty much all the available guidance amplifies this wave to some degree as it approaches the area. The low level cyclonic circulation associated with Beta's remnants along the Gulf coast would appear to continue to block moisture return however, and precipitation is generally expected to decay with the northern stream wave as it reaches our locale Thursday night. Wouldn't be impossible for a few showers to reach northwest or north central IL late Thursday, though forecast soundings indicate only very shallow moisture and a pronounced cap around 800 mb. NBM blended guidance remains dry for our cwa, and am not inclined to differ from that at this time.

The mid-level wave passes off to our east/southeast Friday, as short wave ridging develops into the area downstream of a broad upper trough translating across the northern Rockies and Northern Plains. Surface low pressure trough develops to our northwest, enhancing southerly low level flow into the forecast area Friday night into Saturday. Low level moisture advection off of the western Gulf increases as this occurs, though the cold front rapidly approaches giving limited time to transport significant moisture into the region. Precip chances do ramp up Saturday afternoon into far northwest IL, and across the remainder of the area Saturday evening as the front approaches and moves quickly through the cwa. Forecast soundings depict rather skinny CAPE profiles, thus slight chance thunder mention continues to appear reasonable.

Thursday through Saturday continue to look mild as low level south flow persists. Warmest temps are likely to be Saturday in the thermal ridge axis ahead of the front. Upper 70s to around 80 degrees are likely Thurs-Fri, with solid low 80s (and perhaps even some mid-80s) Saturday.

Large scale trough evolves across eastern North America Sunday into next week, with medium-range models depicting several reinforcing short waves. Unsettled weather expected as this occurs, with several periods of potential showers modulated by individual short waves. Very difficult to time these at this distance given variability from model to model (and run to run) with these waves, though there will likely be some dry periods. Each wave will bring a push of cooler air as well, with temps not expected to get out of the 60s by Monday.

Ratzer

AVIATION. For the 12Z TAFs .

VFR conditions with winds under 10 knots from the SW quadrant are expected through the period. SCT clouds around 15 and 25 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 mi89 min SW 2.9 G 4.1
45187 17 mi49 min WSW 5.8 G 5.8 58°F 63°F1 ft
45174 19 mi39 min SSW 9.7 G 12 60°F 65°F1 ft1023.6 hPa51°F
KNSW3 - Kenosha, WI 22 mi149 min WSW 4.1 G 5.1 59°F 1023 hPa (-0.4)
OKSI2 31 mi149 min NW 1.9 G 2.9 65°F
CHII2 - Chicago, IL 33 mi39 min SSW 13 G 14 62°F 52°F
CNII2 35 mi44 min SW 5.1 G 6 58°F 45°F
CMTI2 - 9087044 - Calumet, IL 44 mi59 min SSW 4.1 G 6 56°F 1023.3 hPa48°F

Wind History for Calumet Harbor, IL
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago/Waukegan Regional Airport, IL10 mi34 minWSW 510.00 miFair54°F46°F77%1022.7 hPa
Chicago / Wheeling, Pal-Waukee Airport, IL13 mi37 minN 010.00 miFair51°F46°F86%1024 hPa
Kenosha, Kenosha Regional Airport, WI21 mi36 minSW 410.00 miFair54°F48°F80%1023.1 hPa
Chicago, Chicago-O'Hare International Airport, IL22 mi38 minN 010.00 miPartly Cloudy54°F46°F75%1023.4 hPa

Link to 5 minute data for KUGN

Wind History from UGN (wind in knots)
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Last 24hrS7S13S11S9SW9SW8SE11SE9SE12SE10SE7S6SE6S5S4S3SW3SW3SW3CalmCalmSW3CalmSW5
1 day agoS5S9S7SE9SE8S11SE14
G19
SE11SE13SE9SE6SE4SE3CalmCalmS5S5S6S8
G16
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2 days agoW3S83S5CalmSW4SE9SE11S11
G17
SE10SE5SE4CalmCalmCalmCalmCalmCalmSW3CalmCalmCalmCalmSW3

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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