Winthrop Harbor, IL Marine Weather and Tide Forecast
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Marine Weather and Tide Forecast for Winthrop Harbor, IL

June 15, 2024 8:50 PM CDT (01:50 UTC) Change Location
Sunrise 5:11 AM   Sunset 8:32 PM
Moonrise 2:17 PM   Moonset 1:31 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.

Marine Forecasts
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LMZ646 Wind Point Wi To Winthrop Harbor Il- 705 Pm Cdt Sat Jun 15 2024

.small craft advisory in effect from 1 am cdt Sunday through late Sunday night - .

Tonight - Southeast wind 10 to 15 knots rising to 15 to 20 knots after midnight, then veering south early in the morning. Gusts up to 25 knots. Mostly cloudy. Waves 3 to 4 feet.

Sunday - South wind 15 to 20 knots easing to 10 to 15 knots late in the afternoon. Gusts up to 25 knots. Slight chance of showers and Thunderstorms. Waves 3 to 4 feet.

Sunday night - South wind 10 to 15 knots with gusts to around 20 knots becoming south 10 to 15 knots after midnight. Partly cloudy. Waves 2 to 4 feet subsiding to 1 to 2 feet in the late evening and overnight.

Monday - South wind 10 to 15 knots becoming south 10 to 15 knots with gusts to around 20 knots in the afternoon. Slight chance of showers and Thunderstorms in the afternoon. Waves 1 to 2 feet.

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7 Day Forecast for Marine Location Near Winthrop Harbor, IL
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Area Discussion for - Chicago, IL
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Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 703 PM CDT Sat Jun 15 2024


- There is a low (20-30%) chance for a few thunderstorms tomorrow morning mainly across northern Illinois.

- A period of warm and humid conditions will start Sunday and last through at least Tuesday. Monday will be the warmest day with peak heat indices near or above 100 degrees.

- Chances for showers and storms Monday onward are relatively low (20% or less), with expected limited coverage.

Issued at 248 PM CDT Sat Jun 15 2024

Through Sunday night:

The Western Great Lakes are positioned between a 1020mb surface high pressure system in southern Ontario and a 1002mb surface low pressure system over the Northern Plains, both beneath inflection points of a developing upper-level ridge centered over the Upper Mississippi River. A series of upper-level shortwave are propagating northeastward from the Plains toward the Great Lakes on the southern periphery of the ridge, with the first now lifting into Minnesota and the second located in southern Kansas. Locally, filtered sunshine, modest humidity levels, and a southeasterly breeze are making for a pleasant mid-June day.

Tonight, the second upper-level shortwave will lift into Iowa and Missouri and induce the development of a broad low-level jet into the Great Lakes. As a result, we should not decouple in spite of relatively low humidity levels, and the night will be marked by breezy southerly winds with lows in the mid to upper 60s.

Tomorrow, the upper-level shortwave is expected to lift into Wisconsin carrying the majority of any remnant overnight convection (initially in Iowa) with it. However, ongoing isentropic ascent along the eastern fringe of the moisture plume shifting eastward into the Great Lakes and along the northern edge of a plume of steep mid-level lapse rates may nevertheless allow for isolated to scattered thunderstorms to develop as far south as northern Illinois. Model guidance typically struggles with the southward extent of thunderstorm LLJ/lapse rate-driven convection, and accordingly, felt introducing 20-30% chances for thunderstorms across northern Illinois tomorrow morning would be prudent. The far more likely scenario is that most areas stay dry tomorrow morning.

Tomorrow afternoon, rising heights in the wake of the shortwave should lead to low-level capping in spite of rising humidity levels and temperatures. As a result, we currently do not favor any (renewed) development of showers and thunderstorms beyond anything that occurs in the morning. Forecast 925mb temperatures around +25C should support afternoon highs in the low to mid 90s. A southwesterly breeze won't offer much respite from the humidity levels and partial sunshine, with max heat indices expected to peak from 95 to 100F during the afternoon. After sunset, winds will relax but high humidity levels will hold overnight lows to the balmy mid to upper 70s.


Monday through Saturday:

The upper ridge that is currently building across the southern CONUS is expected to be lifting into the Mid-Atlantic on Monday as a broad trough digs into the Pacific northwest. This pattern will place stout southwest flow across much of the Mississippi Valley and Great Lakes generating a period of above normal temperatures and high humidity. The warmest day during this period continues look like Monday where high temperatures will likely be in the mid-90s with overnight lows in the mid to upper 70s. Though, there continues to be the possibility for high temperatures to overperform into the upper 90s (20-30% chance)
if there is more sun than currently forecasted. Regardless, the combination of these temperatures and dew points in the upper 60s to around 70 should yield peak heat indices in the 95- 105 degree range Monday afternoon. Given that these values are below our local Heat Advisory criteria (widespread heat indices greater than 105), no heat headlines are anticipated. With that said, we still encourage those who are sensitive to heat to limit time outdoors and remain hydrated.

Furthermore, some guidance (namely the GFS) continues to hint at the potential for scattered showers and storms to develop Monday afternoon. However, all guidance continues to show modest high rises occurring overhead in combination with the mid- levels looking rather dry, which I suspect will prohibit any shower/storm activity despite the robust instability. While I do expect the area to remain dry on Monday, I have maintained a 20% chance for showers/storms Monday just in the off chance something is able to develop. It should be noted that if a stray shower or storm does develop, then high temperatures in those location may verify slightly cooler than forecasted.

Heading into Tuesday, the western extent of the ridge is progged to get shoved east as a trough ejects into the northern Plains. While this will allow more moisture to advect into the southern Great Lakes, the resultant increase in cloud cover should also keep high temperatures a few degrees cooler, in the lower 90s, for Tuesday. Though, peak heat indices in the upper 90s to near 100 are still expected. Additionally, the increase in moisture in conjunction with stout diurnal instability and modest upper height falls will support the potential for isolated to scattered showers and thunderstorms to develop Tuesday afternoon. Though, the lack of more defined forcing may mean most areas stay dry.

Beyond Tuesday, guidance continues to attempt to break down the ridge and develop a more zonal (east-west oriented) pattern. As a result, a frontal boundary is forecasted to be near the Mississippi River and may move through northern IL during the later half of the week, breaking the heat and humidity.
However, there continues to be a wide range of timing differences amongst guidance members on when the front would arrive and the coverage of any associated showers and storms.
Therefore, I have decided to maintain the advertised 90 degree temperatures and 30-40% rain chances offered by the NBM through the end of next week which seem reasonable at this range.


Issued at 704 PM CDT Sat Jun 15 2024

Generally VFR conditions are expected through the TAF cycle with the one possible exception being a low chance of SCTD SHRA and TSRA (20-30% chance) Sunday morning. Upper level disturbance responsible for TSRA over central Plains will move into the region Sunday morning and could lead to some ISOLD to SCTD TSRA, though air mass will be drier and less conducive for storms, so chances appear low. Have kept precip mention out of the Chicago TAF sites for now.

Otherwise, southeast winds tonight will become south-southwest and gusty Sunday morning and remain moderately strong and gusty until sunset Sunday evening.

- Izzi

IN...Air Quality Alert from 1 AM Sunday to 1 AM EDT Monday for INZ019.


Weather Reporting Stations
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Stations Dist Age Wind AirWater WavesinHgDewPt
45187 3 mi31 minS 5.8G9.7 66°F 62°F2 ft
45186 7 mi31 minE 3.9G5.8 66°F 62°F2 ft
KNSW3 - Kenosha, WI 8 mi51 minSSE 4.1G6 69°F 29.98
45199 18 mi81 minESE 16 63°F 61°F2 ft30.02
45174 25 mi41 minESE 14G18 69°F 63°F2 ft29.9261°F
MLWW3 - Milwaukee, WI 37 mi41 minSSE 8.9G11 71°F
CHII2 - Chicago, IL 40 mi31 minSSE 23G26 79°F 67°F
OKSI2 40 mi111 min0G2.9 79°F
45198 42 mi31 minESE 14G16 72°F 65°F2 ft29.98
45007 - S MICHIGAN 43NM East Southeast of Milwaukee, WI 44 mi31 minESE 7.8G9.7 65°F 60°F1 ft30.0159°F
45013 44 mi81 minWSW 5.8G7.8 65°F 61°F1 ft30.00
CNII2 44 mi21 minSE 8G8.9 70°F 59°F

Wind History for Calumet Harbor, IL
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Airport Reports
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AirportDistAgeWind ktVisSkyWeatherAirDewPtRHinHg
KUGN WAUKEGAN NATIONAL,IL 4 sm59 minSSE 11G2110 smClear75°F55°F50%29.97
KENW KENOSHA RGNL,WI 11 sm57 minSSE 1010 smClear75°F55°F50%29.99
KRAC BATTEN INTL,WI 20 sm57 minSSE 12G1710 smClear73°F55°F53%30.00
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Wind History graph: UGN
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GEOS Local Image of great lakes   

Milwaukee, WI,

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