Lake Forest, IL Marine Weather and Tide Forecast
Top   Marine   7-Day   NWS   Buoy   Airport   Tide   Map   GEOS   Radar   TAF  

Marine Weather and Tide Forecast for Lake Forest, IL

June 17, 2024 9:40 AM CDT (14:40 UTC) Change Location
Sunrise 5:12 AM   Sunset 8:32 PM
Moonrise 4:24 PM   Moonset 2:08 AM 
  Print   HELP   Reset   Save   Recall  New
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
    EDIT      HIDE   Help
LMZ740 Winthrop Harbor To Wilmette Harbor Il- Wilmette Harbor To Northerly Island Il- Northerly Island To Calumet Harbor Il- 923 Am Cdt Mon Jun 17 2024

Rest of today - Southwest winds 15 to 25 kt becoming south. Slight chance of showers and Thunderstorms in the afternoon. Waves 1 to 3 ft.

Tonight - South winds 15 to 25 kt. Slight chance of showers and Thunderstorms. Waves 1 to 3 ft.

Tuesday - South winds 15 to 25 kt. Slight chance of showers and Thunderstorms. Waves 1 to 3 ft building to 2 to 4 ft.

Tuesday night - South winds 15 to 20 kt diminishing to 10 to 15 kt. Partly cloudy. Waves 2 to 4 ft.

No data

7 Day Forecast for Marine Location Near Lake Forest, IL
   Hourly   EDIT   Help   Map   HIDE
NEW! Add second zone forecast

Area Discussion for - Chicago, IL
      HIDE   Help   
NOTE: mouseover dotted underlined text for definition

Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 615 AM CDT Mon Jun 17 2024


- Hot and muggy conditions will prevail through the end of the week. Periodic chances for thunderstorms will continue, though many hours will remain dry.

Issued at 238 AM CDT Mon Jun 17 2024

Through Tuesday Night:

Today will be another warm day as a sprawling ridge begins to build across the Mid Atlantic. 850-500 mb thicknesses will increase a bit over where they were on Sunday, so temperatures may end up warmer by a few degrees. A glance at forecast soundings shows a little in the way of drying in the mid-levels, so it seems like dewpoints may mix out a bit more. Favored the warmest guidance for high temperatures today given the expected strong and deep PBL mixing with highs in the urban Chicago core near 96-98 degrees. With dewpoints largely expected to mix out into the mid 60s, heat indices look to be in the 95-105 degree range, with values at the higher end of that range more limited in coverage.

We'll be uncapped by midday in most locations given the forecasted temperatures and dewpoints. However, there don't seem to be any well-defined impulses to drive notable large scale forcing for ascent in the region this afternoon. There is perhaps a low- amplitude disturbance visible in moisture channel loops across central Missouri which will lift northeastward today but that looks to be about it with the remnant convective vortex from Sunday expected to push east across Lake Erie. Slight chance (15-20%) PoPs look reasonable for this afternoon with any activity expected to remain few and far between. An isolated strong/gusty downburst wind threat can't be ruled out given how hot and deeply mixed it'll be.

Tonight, a plume of deeper moisture emanating from the central and western Gulf of Mexico will surge northward. Mid-level lapse rates will trend towards moist adiabatic which will lessen the amount of instability available, but several embedded disturbances/vort lobes within the plume may be enough to crank out some showers or a few storms and have added some low precip chances to account for this.

While the core of the moist plume will pivot east of us through Tuesday, overall increased tropospheric moisture looks like it might limit mixing a bit compared to Monday. With thickness values at or even a bit under Monday's levels, air temperatures are expected to come down a few degrees although dewpoints may not drop as significantly. All of this nets peak heat indices Tuesday afternoon in the 95-100 degree range. Additional very isolated showers or storms once again can't be ruled out with peak heating.


Wednesday through Sunday:

Hot and humid conditions will continue to be the primary focus through the end of the week and into the weekend as a broad ridge and high pressure system over the eastern CONUS continues to build and remain stagnant. Southwesterly flow will allow temperatures to routinely be in the low-to-mid 90s Wednesday through Saturday. Dew points in the upper 60s will bring heat indices into the upper 90s with some areas occasionally pushing 100 degrees. This will keep us below Heat Advisory criteria (>105 degrees for a single day or >100 degrees for 4+ days), however, caution should still be exercised during long periods of time outdoors by taking breaks and hydrating. Overnight lows won't bring much relief as temperatures are only expected to drop into the low- to-mid 70s due to the high moisture content.

Although the heat is the main story through the extended, there are several chances for showers/storms. A synoptic cold/stationary front will be situated across Wisconsin on Wednesday. Convection will initiate ahead of this front and may sneak into the northwest portion of the CWA Wednesday afternoon, so have left some chance PoPs in the forecast.

On Thursday, this front will move further southeast, potentially reaching the northern periphery of the CWA bringing another chance for showers and storms to the northwestern CWA There is also a signal in the long range models for the front to push down Lake Michigan and enhance a lake breeze Thursday afternoon, setting the stage for a possible backdoor cold front scenario.
Depending on the timing of this front, areas near the lakeshore may see an early high temperature with cooling temperatures through the afternoon, however, confidence in occurrence and timing is low at this time.

Towards the end of the work week, the ridge will begin to flatten out and be pushed south by a trough moving across Canada bringing zonal flow to the area. Ensemble guidance shows a consistent signal for a shortwave to move across the area sometime this weekend, with a surface cold front bringing an end to this extended period of heat and humidity. This will also bring a chance for showers and storms with the passing of this front, however, confidence is very low on the timing.


Issued at 615 AM CDT Mon Jun 17 2024

All TAF sites are currently experiencing VFR conditions with light winds and a few high clouds. A fairly tight gradient between high pressure to the east and low pressure to the west will cause southwesterly winds to become gusty this afternoon. Mid-level moisture will allow diurnal clouds to form this afternoon. Although ceilings will likely form, VFR conditions should be maintained.
There is a slight chance for some isolated showers and storms this afternoon, however, confidence in occurrence is not high enough to put in the TAF at this time.

Overnight, winds will back down a bit, but remain on the breezier side, potentially even seeing some gusts throughout the night. If winds calm down further than anticipated or don't gust, LLWS could become an issue overnight tonight with a 35-45 kt low- level jet moving overhead. Although VFR conditions are currently maintained through the end of the TAF period, saturation at low-levels will allow some lower clouds to form, potentially resulting in MVFR ceilings tomorrow morning.


Issued at 441 AM CDT Mon Jun 17 2024

Several temperature records will be threatened over the next few days. The records that appear to be in greatest jeopardy are today's (June 17) record high for Chicago and several record warmest low temperatures for both Chicago and Rockford through Saturday, June 22nd.

Here are the daily high and warmest low temperature records for Chicago and Rockford for each day through June 22nd:

Chicago -------------------------------------------- Day: 6/17 6/18 6/19 6/20 6/21 6/22 -------------------------------------------- Record High: 96 98 102 104 101 97 Record Warm Low: 78 77 78 78 74 76

Rockford -------------------------------------------- Day: 6/17 6/18 6/19 6/20 6/21 6/22 -------------------------------------------- Record High: 99 99 99 101 100 97 Record Warm Low: 75 74 76 73 71 73


IL...Air Quality Alert until midnight CDT tonight for ILZ005-ILZ006- ILZ012-ILZ013-ILZ020-ILZ021-ILZ103-ILZ104-ILZ105-ILZ106- ILZ107-ILZ108.


Weather Reporting Stations
   EDIT       HIDE   Help
Stations Dist Age Wind AirWater WavesinHgDewPt
45186 9 mi30 minSE 7.8G9.7 74°F 63°F1 ft
45174 13 mi40 minS 7.8G9.7 77°F 65°F1 ft29.9068°F
45187 18 mi30 minS 9.7G14 74°F 60°F0 ft
KNSW3 - Kenosha, WI 24 mi40 minSSW 5.1G9.9 84°F 29.92
OKSI2 26 mi100 minE 1.9G5.1 87°F
CHII2 - Chicago, IL 27 mi40 minSSW 19G21 88°F 77°F
45198 29 mi30 minSSW 9.7G14 77°F 66°F1 ft29.97
CNII2 30 mi40 minS 8G13 84°F 67°F
45199 34 mi70 minSSE 9.7 63°F 61°F1 ft29.98
CMTI2 - 9087044 - Calumet, IL 39 mi52 minSSW 6G14 29.95

Wind History for Calumet Harbor, IL
(wind in knots)    EDIT      HIDE   Help
toggle option: (graph/table)

Airport Reports
    EDIT      HIDE   Help   Click EDIT to display multiple airports. Follow links for more data.
AirportDistAgeWind ktVisSkyWeatherAirDewPtRHinHg
KPWK CHICAGO EXECUTIVE,IL 9 sm48 minSW 11G1610 smClear84°F72°F66%29.96
KUGN WAUKEGAN NATIONAL,IL 12 sm49 minSW 1310 smClear84°F72°F66%29.93
KORD CHICAGO O'HARE INTL,IL 19 sm49 minSW 11G1710 smA Few Clouds86°F72°F62%29.95
Link to 1 hour of 5 minute data for KPWK
NEW Forecast page for KPWK

Wind History graph: PWK
(wind in knots)
toggle option: (graph/table)

Tide / Current for
EDIT   Weekend mode (on/off)   HIDE   Help

Tide / Current for
   EDIT      HIDE   Help

Weather Map
      HIDE   Help

GEOS Local Image of great lakes   

Chicago, IL,

NOTICE: Some pages have affiliate links to Amazon. As an Amazon Associate, I earn from qualifying purchases. Please read website Cookie, Privacy, and Disclamers by clicking HERE. To contact me click HERE. For my YouTube page click HERE