Sleepy Hollow, IL Marine Weather and Tide Forecast

Marine Weather and Tide Forecast for Sleepy Hollow, IL

February 20, 2024 3:40 PM CST (21:40 UTC) Change Location
Sunrise 6:40 AM   Sunset 5:32 PM
Moonrise 2:37 PM   Moonset 5:59 AM 
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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.

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Marine Forecasts
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LMZ740 Winthrop Harbor To Wilmette Harbor Il- Wilmette Harbor To Northerly Island Il- Northerly Island To Calumet Harbor Il- 242 Pm Cst Tue Feb 20 2024

Tonight - South winds 15 to 20 kt becoming southwest 10 to 15 kt. Mostly clear in the evening, then becoming mostly cloudy. Waves 1 to 3 ft.

Wednesday - South winds 10 to 20 kt becoming southwest 10 to 15 kt. Partly cloudy. Waves 1 to 2 ft.

Wednesday night - South winds 5 to 10 kt becoming east overnight. Slight chance of showers overnight. Waves around 1 ft.

Thursday - North winds 10 to 15 kt. Chance of showers. Waves 1 to 3 ft.

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7 Day Forecast for Marine Location Near Sleepy Hollow, IL
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Area Discussion for - Chicago, IL
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Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 246 PM CST Tue Feb 20 2024


- Unseasonably warm conditions Wednesday, and again Sunday into early next week.

- Developing showers and a few thunderstorms Wednesday night into Thursday morning.

Issued at 246 PM CST Tue Feb 20 2024

Through Wednesday:

Unseasonably warm conditions continue today amid rather dry conditions and sunny skies. Temps have again over-performed much of the guidance with observed highs generally in the mid to upper 50s as of 2pm CST. With dew points mixing into the mid 20s across most of the north half of the CWA, corresponding RH values have dropped into the upper 20s. Winds gusting over 20 mph and fine fuel moisture marginally low will keep us on the verge of elevated fire concerns this afternoon.

Temps will quickly lower this evening with the dry airmass under mostly clear skies. A low to mid-level wave over northwest Iowa this afternoon has managed to produce some mid-level clouds to its north and east, indicating there is at least some marginal moisture available with this system. While dry conditions are expected tonight, have included some silent <10% PoPs for the potential of a few high-based (10kt or higher)
showers/sprinkles over primarily northeast Illinois in the pre- dawn hours.

Wednesday is setting up to be a very warm day by late February standards with 925hPa temps nearing 10C into the CWA under initially mostly sunny skies. The amount of increasing mid to upper-level cloud cover will dictate temps in the afternoon, but at least some filtered sunshine through sunset will support temps into the mid 60s for much of the area. Current forecast high temps for Chicago and Rockford are 62 and 61F, respectively, short of the record of 67F at both locations.

Wednesday Night through Tuesday:

A sub-tropical stream of Pacific moisture aimed into the Great Basin today will interact with marginal low-level Gulf of Mexico moisture to support increasing rain chances across the area Wednesday night into Thursday. A strengthening surface low passing just south of the CWA Thursday morning will anchor a slow-moving warm front into the extreme southeast CWA. North of the front, low-level isentropic ascent and moisture transport under steep mid-level lapse rates will yield increasing shower and embedded thunder chances across at least the southern half of the CWA and possibly as far north as near the WI line late Wednesday night and Thursday morning.

Cooler, but still seasonably warm, conditions will follow Friday and Saturday, with a mostly dry clipper system perhaps producing a few spotty sprinkles/showers Friday afternoon and/or some flurries Friday evening. Unseasonably warm conditions will then quickly return Sunday into early next week under a broad ridge, with increasing chances for showers and some storms ahead of a digging western trough Monday into mid-week.


Issued at 1109 AM CST Tue Feb 20 2024

SSW winds will gust around 20-25 kts briefly this afternoon before easing around sunset. Another period of breezy SW winds is expected on Wednesday afternoon, although the strongest winds will occur south and east of ORD/MDW. VFR conditions are expected to prevail through the entire TAF period.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesinHgDewPt
WHRI2 - Waukegan Harbor, IL 31 mi101 min SSE 4.1G7 41°F
OKSI2 38 mi101 min ESE 2.9G5.1 55°F
CHII2 - Chicago, IL 40 mi41 min S 21G22 52°F 27°F
CNII2 40 mi26 min S 15G17 56°F 22°F
KNSW3 - Kenosha, WI 42 mi41 min SSE 7G7 40°F 30.07
CMTI2 - 9087044 - Calumet, IL 47 mi59 min S 15G21 54°F 30.0728°F

Wind History for Calumet Harbor, IL
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Airport Reports
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AirportDistAgeWind ktVisSkyWeatherTempDewPtRHinHg
KDPA DUPAGE,IL 13 sm48 minS 14G2610 smClear57°F27°F31%30.07
KPWK CHICAGO EXECUTIVE,IL 21 sm48 minSSW 13G2110 smClear57°F25°F29%30.08
KORD CHICAGO O'HARE INTL,IL 22 sm49 minS 15G2410 smA Few Clouds57°F27°F31%30.07
Link to 5 minute data for KDPA

Wind History from DPA
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Tide / Current for
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Weather Map
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GEOS Local Image of great lakes   

Chicago, IL,

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