Highwood, IL Marine Weather and Tide Forecast

Marine Weather and Tide Forecast for Highwood, IL

April 12, 2024 4:21 PM CDT (21:21 UTC) Change Location
Sunrise 6:12 AM   Sunset 7:31 PM
Moonrise 8:26 AM   Moonset 12:00 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- Calumet Harbor Il To Gary In- 308 Pm Cdt Fri Apr 12 2024

.gale warning in effect until 6 pm cdt this evening - .

Late this afternoon - Northwest gales to 35 kt. Scattered showers and isolated Thunderstorms. Waves 3 to 6 ft.

Tonight - Northwest winds 15 to 25 kt becoming west and diminishing to 15 to 20 kt. Mostly clear. Waves 3 to 5 ft subsiding to 1 to 3 ft.

Saturday - West winds 10 to 20 kt becoming southeast in the afternoon. Sunny. Waves 1 to 2 ft.

Saturday night - South winds 15 to 25 kt becoming southwest. Partly cloudy. Waves 1 to 3 ft.

Sunday - West winds 15 to 25 kt becoming north 15 to 20 kt in the afternoon. Slight chance of showers. Waves 1 to 3 ft building to 2 to 4 ft.

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7 Day Forecast for Marine Location Near Highwood, IL
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Area Discussion for - Chicago, IL
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Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 336 PM CDT Fri Apr 12 2024


- Widely scattered showers will continue through 6 pm across portions of northeast IL and northwest IN. Isolated instances of lightning strikes, gusty winds to 45 mph, and pea sized hail are possible (15% chance).

- Following summer-like warmth, a lake enhanced front will bring an abrupt temperature drop to northeast Illinois and northwest Indiana Sunday afternoon-evening.

- Waves of showers and a good chance (30-40%+) for thunderstorms Monday night through Tuesday night, some of which may be severe, particularly Tuesday afternoon and evening.

- Warm and windy on Tuesday with southerly winds potentially gusting to around 40-45 mph.

Issued at 335 PM CDT Fri Apr 12 2024

Through Saturday Night:

Widely scattered showers have developed across portions of the area this afternoon, namely north of a Rockford to Joliet to Fowler, IN line. These have managed to grow a bit taller than anticipated which has resulted in greater coverage than previously anticipated. In fact, some have managed to grow tall enough to support electrification, with lightning strikes observed in portions of Jasper County, as well as north of the state line in southeast Wisconsin. As was the case yesterday, there is a narrow convergence axis generally along/near the I-65 corridor that could support funnel cloud development yet again though the better potential exists just to the southeast of the forecast area where the RAP non-supercell tornado parameter (NST) is up to 2. With any of the showers gusty winds up to 45 mph and pea sized hail/graupel will be possible along with a few lightning strikes. Winds and shower coverage diminish with sunset with clear skies overnight.

Saturday looks pleasant weather-wise with light west winds to start the day and temperatures warming into the upper 60s to lower 70s, warmest southwest. Winds will turn southwesterly during the afternoon and gradually increase as warm air advects into the region between the developing Northern Plains surface low and high pressure across the Gulf Coast states. A low- amplitude wave will traverse within the upper ridge which could bring the potential for a few showers toward daybreak Sunday but for now have kept the overnight hours dry.


Sunday through Friday:

A relatively mild start to the day on Sunday will ensure that most of the area will be in the 70s come the late morning. Going into the afternoon, some locations, particularly in the southwestern half of our forecast area, should see temperatures climb to 80F for the first time this year. At around the same, however, our northeastern locales will likely start to see temperatures tumble as a lake- enhanced front start to press inland, and eventually, between nocturnal cooling and cold air advection behind the front, temperatures should bottom out in the 40s overnight. There also continues to be a fairly low (~15-20%) chance that a few showers sprout along the frontal boundary in the afternoon (mainly in northwest Indiana), but capping, dry air, and limited forcing support aloft will likely be too much for any convergence-driven attempts at convection along the boundary to overcome. However, if these limiting factors are able to be overcome, the presence of instability aloft associated with an EML over the region will allow for any established convection to be capable of producing lightning.

Mostly clear skies and modest warm air advection off of southeasterly winds should allow for temperatures to recover back into the 70s during the daytime on Monday across most of the area.
Locales near the Lake Michigan shore, particularly those in Illinois, will be the main exception to this as an onshore flow component to the winds will keep temperatures here several degrees cooler than farther inland.

Monday night into Tuesday, a deep upper-level trough will eject out of the southwestern CONUS towards the Upper Midwest, spurring a fairly robust episode of lee cyclogenesis to our west in the process, and bringing a much better chance for showers and storms to our area. Showers and storms could be seen as early as Monday night as warm air advection/isentropic ascent start to ramp up well in advance of the developing low pressure system, but the main time frame of interest to watch for potential severe weather in our area will be Tuesday afternoon into Tuesday night as that is when we will find ourselves in the system's warm sector, which should be characterized by surface temperatures in the 70s, dew points in the upper 50s to mid 60s, and breezy southerly winds (with gusts potentially approaching and exceeding 40 mph at times if rain and cloud cover don't end up being too much of a hindrance).

It's still a little too early to dive into the specifics of this potential severe weather threat as, still being four days out, shifts and changes in forecast guidance are bound to happen and alter the overall forecast expectations for any given event. In fact, over the past several ensemble and deterministic model runs, there has been a clear trend towards a slower and not-as- deep low pressure system, which generally would be less favorable for the overall chances and potential magnitude of the severe weather threat in our area. That being said, even with a slower and weaker surface low, the track of the surface low remaining to our northwest should still draw at least a modest amount of instability into northern Illinois and northwest Indiana which, amidst seasonably strong deep-layer shear, would still present the opportunity for storms to be severe as they track through the area. The latest CIPS Analog guidance and CSU's Machine Learning probabilities corroborate this thinking, so the Storm Prediction Center's Day 5 15% contour that encompasses the entirety of our forecast area continues to look appropriate at this time, but we will continue to monitor forecast trends.

Showers and perhaps a few storms may linger around into Wednesday before another system moves through the region during the latter half of the week. This late week system could bring another round of showers and storms to the area, though overall confidence in this is low at this time. Much higher confidence exists in cooler temperatures returning to the area going into the upcoming weekend.


Issued at 1218 PM CDT Fri Apr 12 2024

Key Aviation Messages: - NW gusts of 30-35 knots this afternoon

VFR conditions are expected through the period. NW winds will continue to gust over 30 knots through early evening before settling WNW around 10 knots by late evening. Winds will then gradually veer WNW through SSW on Saturday. While a lake breeze will develop Saturday afternoon, it is expected to remain east of MDW and especially ORD.


LM...Gale Warning until 6 PM CDT this evening for Winthrop Harbor IL to Gary IN.

Small Craft Advisory until 10 PM CDT this evening for Gary to Burns Harbor IN-Burns Harbor to Michigan City IN.

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesinHgDewPt
WHRI2 - Waukegan Harbor, IL 10 mi82 min WNW 8.9G12
OKSI2 23 mi82 min N 13G21 59°F
CHII2 - Chicago, IL 24 mi32 min NNW 20G22 60°F 39°F
KNSW3 - Kenosha, WI 26 mi22 min WNW 8G11 56°F 29.82
CNII2 27 mi22 min NW 13G22 58°F 35°F
CMTI2 - 9087044 - Calumet, IL 36 mi52 min W 14G21 61°F 29.7836°F

Wind History for Calumet Harbor, IL
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Airport Reports
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AirportDistAgeWind ktVisSkyWeatherTempDewPtRHinHg
KPWK CHICAGO EXECUTIVE,IL 8 sm30 minNNW 16G2510 smMostly Cloudy61°F36°F39%29.82
KUGN WAUKEGAN NATIONAL,IL 15 sm16 minNW 10G268 smOvercast Lt Rain 54°F39°F58%29.84
KORD CHICAGO O'HARE INTL,IL 17 sm22 minW 19G3010 smMostly Cloudy Lt Rain 61°F39°F45%29.81
Link to 5 minute data for KPWK

Wind History from PWK
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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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