Monday, September27, 2021
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Marine Weather and Tides
Gurnee, 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 6:43AMSunset 6:41PM Monday September 27, 2021 2:26 AM CDT (07:26 UTC) Moonrise 10:20PMMoonset 1:21PM Illumination 67% Phase: Waning Gibbous; Moon at 21 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- 902 Pm Cdt Sun Sep 26 2021
.small craft advisory in effect until 4 am cdt Monday...
Rest of tonight..Southwest winds to 30 kt diminishing to 15 to 25 kt overnight. Partly cloudy in the evening then clearing. Waves 2 to 4 ft.
Monday..Southwest winds 10 to 20 kt shifting northeast 15 to 25 kt in the afternoon. Sunny. Waves 1 to 3 ft building to 2 to 4 ft in the afternoon.
Monday night..Northeast winds 15 to 25 kt. Mostly clear. Waves 4 to 6 ft occasionally to 8 ft.
Tuesday..Northeast winds 10 to 15 kt. Sunny. Waves 3 to 5 ft subsiding to 2 to 4 ft in the afternoon.
LMZ740 Expires:202109270930;;236949 FZUS53 KLOT 270202 NSHLOT NEARSHORE MARINE FORECAST National Weather Service Chicago/Romeoville IL 902 PM CDT Sun Sep 26 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>742-270930-


7 Day Forecast for Marine Location Near Gurnee, IL
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location: 42.38, -87.94     debug


Area Discussion for - Chicago, IL
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FXUS63 KLOT 270715 AFDLOT

Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 215 AM CDT Mon Sep 27 2021

SHORT TERM.

Through Monday night .

158 PM . Forecast concerns include gusty southwest winds this afternoon, cold front Monday afternoon/evening, possible high swim risk Monday night and a chance for fog late Monday night.

Southwest winds gusting into the 30-35 mph range will continue through sunset and then only slowly diminish this evening. These strong winds combined with relative humidity levels in the mid 20 percent range will create an elevated fire danger through early this evening. Temps have warmed into the lower 80s for many areas and a few mid 80s are possible before temps level off this afternoon. Increasing mid/high level cloud cover may also aid in capping temps. This cloud cover may become fairly thick for a period late this afternoon into early this evening, but is expected to clear the area fairly quickly later this evening. Could be some virga from these high based clouds but not expecting anything to reach the surface.

Monday will be very warm for late September with highs expected to reach the mid/upper 80s for most locations. The gradient will slowly weaken from north to south ahead of a cold front Monday but there may still be west/southwest winds gusting as high as 25-30 mph across the southern cwa in the morning. The cold front will shift winds to the northeast with temperatures quickly dropping through the 70s. Models have more or less come into decent agreement with the front moving inland from Lake Michigan in the early afternoon, across the metro area through mid afternoon and reaching the I-80 corridor toward sunset. Have followed this general timing in the hourly wind/temp grids, showing the front moving across the cwa. Northeast winds may gust into the 20-25 mph range with the front and remain gusty for a time behind the front, but winds will diminish into the early evening.

North/northeast winds will likely remain fairly strong over southern Lake Michigan into Monday evening and waves may build high enough that a beach hazard statement will be needed for dangerous swimming conditions. With this time period not starting for another 24 hours or so, will hold off issuing any headlines this afternoon.

The front will begin to slow as it reaches the southern cwa early Tuesday morning and may become stationary across central IL and central IN. Guidance is starting to show a trend towards fog near this frontal boundary, which would mainly affect the southern third or so of the area late Monday night into early Tuesday. Possible that if the front were to slow/stall sooner, the fog potential could be a little further north. But from this distance, still plenty of time to watch trends and did not include fog mention with this forecast. cms

LONG TERM. 215 AM CDT

Tuesday night through Sunday .

An anomalously strong upper ridge with a pronounced meridional extent will remain entrenched across the Mississippi River Valley northward to Hudson Bay through Friday. An associated surface high over Ontario will maintain E or SE flow across the area through Thursday and possibly into Friday. 925-850 hPa temps support inland highs in the 80s and shoreline temps in the 70s mid to late week, with the warmest day on Wednesday as the thermal ridge slowly moderates over time. A mid-level wave within a broader trough over the Rockies will be deflected/sheared northward across the Great Plains Wednesday into Thursday. While some guidance suggests light precip could reach the CWA Thursday and Friday, the existing ridge and deep dry layer supports a dry forecast with mainly intermittent mid to upper-level clouds.

Saturday and Sunday: The ridge will finally breakdown this weekend, though significant model variability exists with how quick the ridge erodes over Ontario as well as with the evolution of an upper-low ejecting from the Four Corner region. The complexity of this pattern warrants slight chance PoPs through the weekend, though conditions will likely remain dry for at least one of the days.

Kluber

AVIATION. For the 06Z TAFs .

Dry conditions are expected through the TAF period amid several wind changes. Slow decoupling since last evening has allowed for continued gusts up to 25 knots as of TAF issuance, with a 45-50 knot LLJ centered around 2kft. These gusts should become more sporadic through daybreak, but reappear during the mid-morning as daytime mixing taps into some of the residual stronger winds of the waning LLJ.

The background pressure gradient will weaken by early afternoon, with winds slowly veering west around or under 10 knots. A cold front tracking southward will surge inland from Lake Michigan during the mid-afternoon, producing initial NE gusts of around 20 knots. This wind shift is expected to occur around 21Z at ORD, with a larger window of uncertainty from 20-22Z.

NE winds under 10 knots will persist through tonight. A low-end MVFR or high-end IFR stratus deck may form upstream under the frontal inversion and advect into the Chicago metro terminals as early as 00Z. With low confidence in occurrence, introduced only a SCT010 with this TAF issuance.

Kluber

LOT WATCHES/WARNINGS/ADVISORIES. IL . None. IN . None. LM . Small Craft Advisory . nearshore waters until 4 AM Monday.



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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WHRI2 - Waukegan Harbor, IL 7 mi87 min WSW 18 G 26
45186 8 mi37 min 16 G 23 69°F 64°F2 ft
45187 11 mi37 min SW 14 G 18 69°F 63°F2 ft
KNSW3 - Kenosha, WI 16 mi27 min SW 11 G 20 72°F 1007.5 hPa
45174 23 mi37 min SSW 16 G 21 65°F3 ft1007 hPa
OKSI2 36 mi87 min WNW 1.9 G 6 71°F
CHII2 - Chicago, IL 38 mi177 min SSW 28 G 31 72°F 53°F
45198 39 mi37 min SSW 18 G 23 69°F 63°F2 ft58°F
CNII2 40 mi27 min SSW 8.9 G 14 69°F 52°F
MLWW3 - Milwaukee, WI 43 mi37 min WSW 8 G 9.9 70°F
JAKI2 46 mi87 min SW 7 G 13 71°F

Wind History for Calumet Harbor, IL
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SW6
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W4
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G6
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G5
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G8
W4
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G10
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G17
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G13
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G12
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SW3
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G8
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G11
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G14
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G13
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G20
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G22
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G15
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G18
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G20
S16
G22
W7
G18
W7
G11
W6
G14

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago/Waukegan Regional Airport, IL5 mi32 minSW 12 G 2010.00 miFair70°F54°F57%1006.3 hPa
Kenosha, Kenosha Regional Airport, WI15 mi34 minSW 11 G 1910.00 miFair72°F54°F53%1007.1 hPa
Chicago / Wheeling, Pal-Waukee Airport, IL19 mi35 minSSW 9 G 2110.00 miFair70°F54°F57%1008.5 hPa

Link to 5 minute data for KUGN

Wind History from UGN (wind in knots)
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Last 24hrSW7SW6SW6SW6SW6SW9SW11SW12
G19
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SW9SW7SW11SW15
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1 day ago4Calm4SW5W3W4454NW10
G18
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G21
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SW8W4SW5SW4SW5SW6SW6SW8SW8SW7
2 days ago43W4SW3Calm4SW7SW10
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G25
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SW16
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SW10SW7SW12NW85NW6NW66

Tide / Current Tables for
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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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