Wilmette, IL Marine Weather and Tide Forecast

Marine Weather and Tide Forecast for Wilmette, IL

April 14, 2024 3:54 AM CDT (08:54 UTC) Change Location
Sunrise 6:09 AM   Sunset 7:32 PM
Moonrise 10:15 AM   Moonset 1:48 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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LMZ741 Expires:202404141530;;717459 Fzus53 Klot 140848 Nshlot
nearshore marine forecast national weather service chicago/romeoville il 348 am cdt Sun apr 14 2024
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>742-141530- winthrop harbor to wilmette harbor il- wilmette harbor to northerly island il- northerly island to calumet harbor il- 348 am cdt Sun apr 14 2024

.small craft advisory in effect until 10 am cdt this morning - .

Today - Southwest winds to 30 kt becoming northwest 10 to 20 kt in the late morning and then quickly northeast 10 to 15 kt in the early afternoon. Mostly Sunny. Waves 2 to 4 ft subsiding to 1 to 2 ft in the afternoon.

Tonight - Northeast winds 5 to 10 kt becoming north overnight. Mostly clear. Waves around 1 ft.

Monday - North winds 5 to 10 kt becoming northeast 10 to 15 kt in the afternoon. Mostly Sunny. Waves 1 to 2 ft.

Monday night - East winds 10 to 15 kt. Slight chance of showers overnight. Waves 1 to 3 ft.

No data

7 Day Forecast for Marine Location Near Wilmette, IL
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Area Discussion for - Chicago, IL
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Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 330 AM CDT Sun Apr 14 2024


- Summer-like warmth in store today, with the exception of areas near Lake Michigan this afternoon. Not as warm but still well above normal Monday, except again notably cooler near the lake.

- Waves of showers and scattered thunderstorms late Monday night through Tuesday night-early Wednesday. Some thunderstorms may be severe, particularly Tuesday afternoon through early Wednesday.

- Windy late Tuesday through Wednesday. Gusts peaking 40+ mph on Wednesday.

- Unseasonable warmth continues through Tuesday, except near the lake on Monday and along/near the Illinois shore on Tuesday, followed by a noteworthy cool-down late in the week.

Issued at 330 AM CDT Sun Apr 14 2024

Through Monday:

An early summer preview is on the way for most of the area today.
Lakeshore areas will be warm until mid-day when an enhanced lake breeze front spreads inland with much cooler conditions in its wake. A weak cold front will shift across the area this morning through mid day, shifting winds to west and then northwest. As we tap into the departing stout low-level jet, expect gusts up to 20-30 mph through the mid to late morning. Behind the frontal passage as winds turn synoptically more northerly, the sharp land- lake thermal gradient will help quickly turn winds onshore by mid day/early afternoon. The synoptically enhanced lake breeze will then make steady progress inland through the afternoon.

Our expectation is for dew points to similarly to Saturday run lower than most guidance and more in line with the HRRR, RAP, and ECMWF MOS. The drier boundary layer plus plenty of sun, the mild start to the day, and very warm temps aloft (850 mb temps of 13-15C and 925 mb temps of 18-21C) will set the stage for very warm temperatures inland, peaking in the lower to mid 80s. Near the lake, as alluded to earlier, temps will likely reach the mid to upper 70s by mid day prior to the lake breeze passage, but then steadily fall through the 60s and down into the upper 50s by early evening. Lake cooling behind the lake breeze will be noticeable about 10-15 miles away from the lake, but progressively less so the farther inland you go.

High pressure will build over the area tonight, resulting in a relatively cool night, especially considering the warmth away from the lake this afternoon. Lows will be in the mid 40s to around 50F, coolest north of I-80 outside of Chicago, and particularly across far northeast Illinois where localized lower 40s are probable. Monday will be cooler aloft (low teens C at 850 mb and low-mid teens C at 925 mb, so highs won't be quite as warm.
However, paired with plenty of sun and low dew points (mid 30s to lower 40s) temps will still reach well into the 70s far inland, warmest and in the upper 70s in the far western and southern CWA
Onshore flow through the day with lake breeze reinforcement will keep highs along the lakeshore 15-20F cooler, only in the mid 50s to around 60F. A more pronounced lake cooling footprint will extend farther inland than today.


Monday Night through Tuesday night:

The main focus during the period will revolve around the potent spring storm system expected to evolve from the upper low currently centered just offshore of San Francisco, CA. Forecast and ensemble solutions continue in good generally agreement that this mid-level wave will induce Lee cyclogenesis across the Colorado Rockies on Monday before tracking east-northeastward across the Corn Belt Tuesday into early Wednesday. However, there has been a notable slowing trend with the system as it begins to occlude while tracking across southern WI late Tuesday night into Wednesday. While such a trend in guidance is not atypical of such systems, it does add some concern that a local severe weather threat could persist across at least eastern sections of our area through Wednesday morning.

In spite of the slowing trend noted in the latest guidance, big picture-wise there has not been any major changes with the forecast thinking for the Monday night through Wednesday time period. The systems warm front is expected to make northward progress across central IL on Tuesday, but several waves of elevated convection across the area late Monday night into Tuesday is likely hinder its northward progress into far northern IL (north of I-80) through at least the daylight hours of Tuesday. For this reason, breezy onshore east-southeasterly winds north of the warm front will result in chilly conditions along and near the lake, as temperatures hold in the 50s through the day. High temperatures on Tuesday for the IL lakeshore areas may actually occur Tuesday evening as the warm front finally begins to make northward progress across far northeastern IL. Conversely, areas south of the warm front will warm into the 70s on Tuesday, amidst gusty southerly winds.

The initial waves of showers and storms north of the warm front late Monday night into Tuesday morning will be elevated and largely non-severe. However, later in the day, warm sector convection is likely to fire west and southwest of the area across parts of IA and MO in closer proximately to the stronger dynamics associated with the approaching storm system. The presence of strong deep layer shear will support organized severe convection, initially across IA and MO Tuesday afternoon. However, the severe storm risk may then shift eastward into most of northern IL and northwestern IN Tuesday evening/night as all of this activity tracks east-northeastward. Confidence in the extent of the severe threat into our area Tuesday evening/night remains medium at this time. It certainly does not look to be timed well diurnally for our area. However, the presence of strong shear and dynamics with the incoming system could certainly (at least to some degree)
support the maintenance of severe storms as they shift into our area after dark on Tuesday. We still have to see what kind of take some of the shorter range, higher resolution forecast guidance has on all this before we can start to nail down the more salient, finer scale details of the severe weather threat with higher confidence.


Wednesday through Saturday:

The system's cold front will eventually sweep across the area on Wednesday as the occluded, weakening surface low pressure tracks toward central Lake Michigan. Some showers should persist through mid-day Wednesday and possibly into the afternoon in spots, with a chance for additional thunderstorms. Given the latest trends in the guidance with slowing the forecast timing of the cold frontal passage, the threat for renewed severe weather could develop as far west as parts of my eastern areas (east of I-57)
on Wednesday. We will have to continue to monitor this potential. Otherwise, westerly winds could gust up to 40-45 mph behind the cold front Wednesday afternoon during the period of strongest pressure rises and steepening low-level lapse rates.
A noteworthy cool-down to solidly below normal temperatures is then in store for the latter half of the week into the weekend.
In fact, we may be dealing with frost/freeze concerns Friday night and/or Saturday night in parts of the area, as the growing season will be off to a fast start with all the warmth (and additional rain) this week.


Issued at 1230 AM CDT Sat Apr 13 2024

Aviation Forecast Concerns:

- LLWS and sporadic south-southwesterly surface gusts associated with 50-60 kt low- level jet overnight.

- Surface wind trends through the day.
- A northwesterly wind shift expected area-wide by mid- morning.
- Lake breeze induced east-northeasterly wind shift expected to follow this afternoon at the Chicago metro sites.

An area of low pressure will race eastward across the Upper Great Lakes this morning. While no precipitation is expected locally with this system, it will continue to drive a potent 50 to 60 kt southwesterly low-level jet (only a couple thousand feet off the surface) across the area overnight. Accordingly, low-level wind shear will be of concern overnight until the low-level jet abates with daybreak this morning. Sporadic gusts up around 25 kt can also be expected overnight, especially at the main metro area sites (KORD/KMDW).

A cold front, trailing from the Upper Great Lakes low, will shift southward across the area by mid-morning, resulting in a northwesterly wind shift. As mixing develops after sunrise, we may see brief bump in wind gusts (around 25 kts) as we start to tap into the bottom of the weakening low-level jet, though wind gusts should gradually ease by midday. Thereafter, an east-northeasterly wind shift is expected across the Chicago area terminals as a lake breeze shifts inland through the afternoon. This lake breeze wind shift should reach KGYY by early afternoon (18-19z), and KMDW and KORD will see it arrive sometime in the 19 to 21z timeframe.


LM...Small Craft Advisory until 7 AM CDT this morning for the IL and IN nearshore waters.

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesinHgDewPt
OKSI2 13 mi114 min W 6G15 65°F
CHII2 - Chicago, IL 14 mi34 min SW 33G36 66°F 51°F
CNII2 17 mi39 min SW 8.9G18 62°F 45°F
WHRI2 - Waukegan Harbor, IL 20 mi114 min SSW 13G18
CMTI2 - 9087044 - Calumet, IL 26 mi54 min SSW 12G21 62°F 29.6948°F
KNSW3 - Kenosha, WI 35 mi54 min SSW 9.9G14 65°F 29.65
BHRI3 - Burns Harbor, IN 43 mi74 min SSW 12G17 62°F 29.75

Wind History for Calumet Harbor, IL
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Airport Reports
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AirportDistAgeWind ktVisSkyWeatherTempDewPtRHinHg
KPWK CHICAGO EXECUTIVE,IL 9 sm62 minSW 12G1910 smClear63°F46°F55%29.70
KORD CHICAGO O'HARE INTL,IL 12 sm63 minSW 14G2310 smPartly Cloudy63°F46°F55%29.69
KMDW CHICAGO MIDWAY INTL,IL 20 sm61 minSSW 09G1910 smMostly Cloudy63°F46°F55%29.71
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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