Marine Weather and Tide Forecast for Evanston, IL
April 26, 2025 12:43 AM CDT (05:43 UTC)
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![]() | Sunrise 5:51 AM Sunset 7:45 PM Moonrise 5:02 AM Moonset 6:43 PM |
LMZ741 Expires:202504261000;;460032 Fzus53 Klot 260219 Nshlot
nearshore marine forecast national weather service chicago/romeoville il 919 pm cdt Fri apr 25 2025
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>742-261000- winthrop harbor to wilmette harbor il- wilmette harbor to northerly island il- northerly island to calumet harbor il- 919 pm cdt Fri apr 25 2025
.small craft advisory in effect through Saturday evening - .
Rest of tonight - North winds to 30 kt with a few gales to 35 kt possible. Mostly cloudy. Waves 4 to 7 ft occasionally to 9 ft building to 5 to 8 ft occasionally to 10 ft.
Saturday - North winds 25 to 30 kt diminishing to 10 to 20 kt. Mostly cloudy in the morning then clearing. Waves 5 to 8 ft occasionally to 10 ft subsiding to 4 to 6 ft occasionally to 8 ft.
Saturday night - North winds 10 to 20 kt becoming northeast overnight. Mostly clear. Waves 3 to 5 ft subsiding to 2 to 4 ft.
Sunday - East winds 5 to 10 kt becoming southeast. Partly cloudy. Waves 1 to 3 ft.
nearshore marine forecast national weather service chicago/romeoville il 919 pm cdt Fri apr 25 2025
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>742-261000- winthrop harbor to wilmette harbor il- wilmette harbor to northerly island il- northerly island to calumet harbor il- 919 pm cdt Fri apr 25 2025
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7 Day Forecast for Marine Location Near Evanston, IL

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Area Discussion for Chicago, IL
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FXUS63 KLOT 260539 AFDLOT
Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 1239 AM CDT Sat Apr 26 2025
KEY MESSAGES
- Brisk north winds tonight followed by seasonably cool and dry conditions for Saturday.
- A strong warming trend into Monday with highs in the lower 80s for Monday.
- A chance for strong to potentially severe thunderstorms as a cold front moves across the region Monday night into Tuesday next week.
DISCUSSION
Issued at 307 PM CDT Fri Apr 25 2025
Through Sunday:
Showers and isolated storms ending late this afternoon over northwest IN and east central IL as the shortwave trough and wave of low pressure move east of the area. Increasing nly winds are then expected as low pressure deepens across the lower Great Lakes while a 1030 mb high builds into ern MN and nw WI. Nly wind gusts of 30-35 mph will be possible near the lake.
Temps will fall into the 40s by Saturday morning.
High pressure will then move across nrn IL and nrn IN Saturday afternoon and night. Sly winds and warm advection will then begin on Sunday. High temps Saturday will range from near 60F toward central IL to around 50F at the lake followed by mid to upper 60s away from the lake for Sunday.
MG
Sunday Night through Friday:
High pressure will hang on for one more day as temperatures begin to moderate Sunday. This moderation will be courtesy of southerly winds and rising heights aloft as a ridge starts to build into the upper Midwest. Humidity and warmth then increase Monday as a low pressure system approaches the western end of Lake Superior. Thunderstorms are expected over the northwestern half of the CWA Monday morning as a waning LLJ leans over east into the region. MUCAPE and effective shear appears weak on the GFS, so any storms look to be sub-severe at this time. The morning storm potential will be followed by a late morning and afternoon lull with some potential scattering of the clouds. A line of storms then looks to form over Iowa and translate east with time Monday night. GFS soundings support some severe threat with 1500 to 2000 J/kg of MLCAPE, effective shear of 40 knots and modest low to mid lapse rates ranging from 6 to 7 C/km.
0-6km shear boundary parallel shear seems to suggest a linear storm threat with some QLCS potential given cyclonic hodograph curvature and 0-3km shear around 40 knots. Trends will be monitored through the weekend to pin down more accurate timing and threats for Monday. A second threat window also looks possible Tuesday pending how quickly a boundary clears us Tuesday morning and afternoon.
Beyond, high pressure moves in mid week, keeping conditions quiet, before a warm front approaches bringing rain chances toward the end of the extended period.
CM
AVIATION /06Z TAFS THROUGH 12Z SUNDAY/
Issued at 1239 AM CDT Sat Apr 26 2025
Key Aviation Messages for the current TAF period:
- MVFR cigs expected through Saturday morning
- Gusty winds to 25 knots overnight will gradually diminish into Saturday afternoon
No precipitation is expected through the current TAF period as high pressure gradually increases through the weekend. Stratus clouds have blanketed the area resulting in widespread lower MVFR cigs. there are isolated pockets of terminals observing IFR cigs, but they are mostly on the southern end of Lake Michigan and widespread IFR is not forecast. Clearer skies are gradually sinking southward out of Wisconsin and Minnesota. VFR cigs will eventually return to the terminals on Saturday. There is moderate confidence on the timing in the TAF, but it would not being surprising if around daybreak it flopped a little going VFR then back to MVFR as breaks in the clouds happen.
The last impact to terminals in the current TAF window is from the gustier wind conditions in the short term. While most of the winds are out of a "northerly" direction, it varies at specific locations (020 at KORD and points west, but 350 at GYY and areas south and east). Gusts are expected to be between 25 to 30 knots through daybreak and then gradually diminish to around 20 knots in the early afternoon. Winds should slacken by 00Z and become more widespread northeasterly.
DK
LOT WATCHES/WARNINGS/ADVISORIES
IL...None.
IN...None.
LM...Small Craft Advisory until 7 PM CDT Saturday for the IL and IN nearshore waters.
Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 1239 AM CDT Sat Apr 26 2025
KEY MESSAGES
- Brisk north winds tonight followed by seasonably cool and dry conditions for Saturday.
- A strong warming trend into Monday with highs in the lower 80s for Monday.
- A chance for strong to potentially severe thunderstorms as a cold front moves across the region Monday night into Tuesday next week.
DISCUSSION
Issued at 307 PM CDT Fri Apr 25 2025
Through Sunday:
Showers and isolated storms ending late this afternoon over northwest IN and east central IL as the shortwave trough and wave of low pressure move east of the area. Increasing nly winds are then expected as low pressure deepens across the lower Great Lakes while a 1030 mb high builds into ern MN and nw WI. Nly wind gusts of 30-35 mph will be possible near the lake.
Temps will fall into the 40s by Saturday morning.
High pressure will then move across nrn IL and nrn IN Saturday afternoon and night. Sly winds and warm advection will then begin on Sunday. High temps Saturday will range from near 60F toward central IL to around 50F at the lake followed by mid to upper 60s away from the lake for Sunday.
MG
Sunday Night through Friday:
High pressure will hang on for one more day as temperatures begin to moderate Sunday. This moderation will be courtesy of southerly winds and rising heights aloft as a ridge starts to build into the upper Midwest. Humidity and warmth then increase Monday as a low pressure system approaches the western end of Lake Superior. Thunderstorms are expected over the northwestern half of the CWA Monday morning as a waning LLJ leans over east into the region. MUCAPE and effective shear appears weak on the GFS, so any storms look to be sub-severe at this time. The morning storm potential will be followed by a late morning and afternoon lull with some potential scattering of the clouds. A line of storms then looks to form over Iowa and translate east with time Monday night. GFS soundings support some severe threat with 1500 to 2000 J/kg of MLCAPE, effective shear of 40 knots and modest low to mid lapse rates ranging from 6 to 7 C/km.
0-6km shear boundary parallel shear seems to suggest a linear storm threat with some QLCS potential given cyclonic hodograph curvature and 0-3km shear around 40 knots. Trends will be monitored through the weekend to pin down more accurate timing and threats for Monday. A second threat window also looks possible Tuesday pending how quickly a boundary clears us Tuesday morning and afternoon.
Beyond, high pressure moves in mid week, keeping conditions quiet, before a warm front approaches bringing rain chances toward the end of the extended period.
CM
AVIATION /06Z TAFS THROUGH 12Z SUNDAY/
Issued at 1239 AM CDT Sat Apr 26 2025
Key Aviation Messages for the current TAF period:
- MVFR cigs expected through Saturday morning
- Gusty winds to 25 knots overnight will gradually diminish into Saturday afternoon
No precipitation is expected through the current TAF period as high pressure gradually increases through the weekend. Stratus clouds have blanketed the area resulting in widespread lower MVFR cigs. there are isolated pockets of terminals observing IFR cigs, but they are mostly on the southern end of Lake Michigan and widespread IFR is not forecast. Clearer skies are gradually sinking southward out of Wisconsin and Minnesota. VFR cigs will eventually return to the terminals on Saturday. There is moderate confidence on the timing in the TAF, but it would not being surprising if around daybreak it flopped a little going VFR then back to MVFR as breaks in the clouds happen.
The last impact to terminals in the current TAF window is from the gustier wind conditions in the short term. While most of the winds are out of a "northerly" direction, it varies at specific locations (020 at KORD and points west, but 350 at GYY and areas south and east). Gusts are expected to be between 25 to 30 knots through daybreak and then gradually diminish to around 20 knots in the early afternoon. Winds should slacken by 00Z and become more widespread northeasterly.
DK
LOT WATCHES/WARNINGS/ADVISORIES
IL...None.
IN...None.
LM...Small Craft Advisory until 7 PM CDT Saturday for the IL and IN nearshore waters.
Stations | Dist | Age | Wind | Air | Water | Waves | inHg | DewPt |
OKSI2 | 9 mi | 103 min | N 16G | 46°F | ||||
CHII2 - Chicago, IL | 10 mi | 33 min | N 37G | 51°F | 51°F | |||
CNII2 | 13 mi | 88 min | NNW 15G | 44°F | 42°F | |||
CMTI2 - 9087044 - Calumet, IL | 22 mi | 55 min | NNW 17G | 30.10 | ||||
WHRI2 - Waukegan Harbor, IL | 24 mi | 103 min | NNW 12G | 44°F | ||||
BHRI3 - Burns Harbor, IN | 39 mi | 63 min | NNW 12G | 44°F | 30.12 | |||
45199 | 46 mi | 73 min | N 23 | 39°F | 40°F | 6 ft | 30.15 | |
MCYI3 - Michigan City, IN | 46 mi | 43 min | NNW 25G | 43°F | 30.08 | 43°F |
Wind History for Calumet Harbor, IL
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Airport Reports
Link to 1 hour of 5 minute data for KPWK
Terminal Aerodrome Forecast (TAF) for KPWK
Wind History Graph: PWK
(wind in knots)GEOS Local Image of great lakes
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