Joliet, IL Marine Weather and Tide Forecast

Marine Weather and Tide Forecast for Joliet, IL

April 21, 2024 9:13 PM CDT (02:13 UTC) Change Location
Sunrise 6:01 AM   Sunset 7:41 PM
Moonrise 5:40 PM   Moonset 5:05 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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LMZ742 Expires:202404220930;;159123 Fzus53 Klot 220201 Nshlot
nearshore marine forecast national weather service chicago/romeoville il 901 pm cdt Sun apr 21 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>742-220930- winthrop harbor to wilmette harbor il- wilmette harbor to northerly island il- northerly island to calumet harbor il- 901 pm cdt Sun apr 21 2024

Rest of tonight - Southeast winds 5 to 10 kt becoming west late in the evening. Clear. Waves around 1 ft.

Monday - Southwest winds 10 to 15 kt increasing to 15 to 25 kt. Sunny in the morning, then becoming partly cloudy. Waves around 1 ft building to 1 to 3 ft.

Monday night - Southwest winds 20 to 25 kt increasing to 30 kt. Slight chance of showers in the evening, then chance of showers overnight. Waves 2 to 4 ft. A small craft advisory will likely be needed.

Tuesday - Southwest winds 20 to 25 kt. Chance of showers in the morning, then showers likely and slight chance of Thunderstorms in the afternoon. Waves 2 to 4 ft.

No data

7 Day Forecast for Marine Location Near Joliet, IL
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Area Discussion for - Chicago, IL
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Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 648 PM CDT Sun Apr 21 2024


- Frost expected tonight for areas outside of the core of the Chicago metro.

- Frost may develop again late Wednesday night.

- Warmer by the end of the week with periodic showers and storms Friday into next weekend.

Issued at 230 PM CDT Sun Apr 21 2024

Through Monday Night:

Dry and seasonably cool conditions today will give way to increasing temps and gusty southwest winds for Monday. The combination of dry conditions, clear skies tonight, and nearby surface ridge will support another night with good radiational cooling. Moderation of the airmass over the past day will yield somewhat warmer conditions than last night, with lows generally in the mid 30s to locally low 30s away from the core of the Chicago metro. Max RH values of around 80-85% late tonight along with 15 knot flow as low as 0.5-1kft should mitigate widespread frost generation even with temps nearing freezing. While a Frost Advisory will include most of the forecast area, the set- up looks rather marginal for notable impacts to vegetation.

We continue to message elevated fire weather concerns for Monday as WAA and strengthening SW winds promote decent mixing by the afternoon. Upstream dewpoints in the source region across the Great Plains are in the upper teens to mid 20s this afternoon. While some evapotranspiration should slightly moisten this airmass, afternoon dew points in the mid to upper 20s appear quite plausible in our area. Following guidance that is typically more aggressive with mixing, these dew points with temps in the mid 60s results in minimum RH values around or just above 25%. However, RH values could be a little lower if thickening upper-level clouds are delayed later in the day and mixing overperforms. Overall, the combination of the low RH, SW gusts over 25 mph (especially northwest of I-57), and fine-fuel moisture values under 10% will support near critical fire weather conditions for much of the area Monday afternoon.

Strong upper-level diffluence ahead of a zonal jet streak over the northern Great Plains will promote decent mid-level ascent over an antecedent dry airmass Monday night. Modest mid-level lapse rates around over 7C/km should drag a band of elevated scattered showers from northwest to southeast during the night.
With continued strong low-level flow and an existing deep reservoir of sub-cloud dry air, any shower could produce locally strong gusts.


Tuesday through Sunday:

Surface low pressure is progged to be tracking across the northern Great Lakes Tuesday morning, in association with a mid- level short wave trough digging southeast across the region. The WFO LOT cwa is expected to start the day within the showery and breezy low-level warm sector, with the highest morning rain chances likely across the southeast half of the forecast area within the main warm/moist advection axis. Lapse rates initially appear rather unfavorable for thunderstorms during the morning hours, though the combination of mid-level cooling with the approaching short wave trough and diurnal warming of low levels makes profiles more suitable for lightning during the afternoon and early evening hours along with a re-expansion of shower coverage as a strong cold front pushes into the area from the north. Low-level moisture may be a limiting factor in thunderstorm coverage however, with highest forecast surface dew points only in the mid-upper 40s ahead of the front. Sharply cooler air then spreads into the area behind the front Tuesday night, with showers tapering to some spotty drizzle in low clouds behind the front.

Overnight lows Tuesday night are expected to dip into the low- mid 30s, though breezy north-northeast winds and lingering cloud cover in some spots should largely preclude any widespread frost issues. Wednesday will be cool, with breezy northeast winds and persistent cold advection limiting highs to the 40s near Lake Michigan and the low-mid 50s farther inland. Wednesday night appears to have a greater frost/freeze threat for the area as surface high pressure settles over the western Great Lakes region. Light winds and mainly clear skies would likely support freezing/sub-freezing low temperatures for locations outside of Chicago and the immediate Lake Michigan shores.

Broad upper level ridging is then progged to develop for the end of the week, leading to warming temperatures. Warming looks to initially be attenuated by low level east-southeasterly flow across the area Thursday, maintaining lake cooling for northeast Illinois. More solid warming is expected Friday (perhaps as early as Thursday night) into the weekend however, as low level flow veers more southerly with time in response to an area of low pressure which extended guidance and ensembles continue to track northwest of the forecast area. Not surprisingly, there is spread in the model timing and track solutions at this distance, but increasing storm chances and some severe weather threat will need to be monitored within the region in this pattern.


Issued at 645 PM CDT Sun Apr 21 2024

Breezy west-northwest winds ease with sunset this evening becoming light out of the west southwest around 5kt through the rest of the overnight hours. The lake breeze is expected to remain east of ORD/MDW though it may still get close enough to MDW for the direction to become somewhat variable after sunset (under 5kt) before returning to a westerly direction shortly thereafter. Winds pick back up during the day on Monday out of the west-northwest with gusts in the 20-25+kt range, highest toward RFD.

VFR conditions are forecast with clear skies overnight into Monday morning then increasing cirrus during the afternoon.
CIGS gradually lower heading into Monday evening and overnight as our next weather system approaches. An associated strong low- level jet will move overhead resulting in increasing gustiness at the surface Monday night, potentially near 30kt at the end of the 30-hr TAF period. Dry low levels should limit shower coverage during this time, though a few spotty showers can't be ruled out, currently accounted for with a VCSH mention.


IL...Frost Advisory from 2 AM to 8 AM CDT Monday for ILZ003-ILZ004- ILZ005-ILZ008-ILZ010-ILZ011-ILZ012-ILZ019-ILZ020-ILZ021- ILZ023-ILZ032-ILZ033-ILZ039-ILZ106-ILZ107-ILZ108.

IN...Frost Advisory from 2 AM CDT /3 AM EDT/ to 8 AM CDT /9 AM EDT/ Monday for INZ001-INZ002-INZ010-INZ011-INZ019.


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesinHgDewPt
CMTI2 - 9087044 - Calumet, IL 36 mi56 min ESE 5.1G7 30.09
CNII2 37 mi29 min SE 7G8.9 47°F 36°F
OKSI2 39 mi134 min ESE 2.9G5.1 52°F
CHII2 - Chicago, IL 41 mi44 min SSE 8.9G9.9 49°F 39°F

Wind History for Calumet Harbor, IL
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Airport Reports
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AirportDistAgeWind ktVisSkyWeatherTempDewPtRHinHg
KJOT JOLIET RGNL,IL 1 sm18 mincalm10 smClear50°F30°F46%30.14
KLOT LEWIS UNIVERSITY,IL 7 sm19 minWSW 0410 smClear52°F27°F37%30.14
KARR AURORA MUNI,IL 24 sm21 minWSW 0410 smClear48°F27°F43%30.12
Link to 5 minute data for KJOT

Wind History from JOT
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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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