Marine Weather and Tide Forecast for Dune Acres, IN
April 25, 2025 11:18 PM CDT (04:18 UTC)
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LMZ779 Expires:202504260930;;459217 Fzus63 Kmkx 260206 Glflm
open lake forecast for lake michigan national weather service milwaukee/sullivan wi 906 pm cdt Fri apr 25 2025
for waters beyond 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 wave, along with the average height of the highest 10% of the waves which will occasionally be encountered.
Synopsis -
strong high pressure around 30.3 inches will move slowly into the region overnight into Saturday. Brisk north winds will continue over the lake into Saturday morning, with a few gale force gusts possible. Winds will subside north to south Saturday afternoon, as the high builds in. Light and variable winds under the high are expected Saturday night into Sunday morning.
low pressure around 29.3 inches will then track from south dakota to lake superior on Monday, with breezy southerly winds over lake michigan Monday morning into Monday night. The associated cold front will cross the region on Tuesday, with winds veering from southwest to northwest as it passes. North winds will weaken into Tuesday night, with high pressure around 30.3 inches moving into the region. Light and variable winds should occur on Wednesday.
lmz080-669-671-673-675-777-779-870-872-874-876-878-260930- lake michigan from michigan city in to st. Joseph mi 5 nm offshore to mid lake- lake michigan from sheboygan to port washington wi 5 nm offshore to mid lake- lake michigan from port washington to north point light wi 5 nm offshore to mid lake- lake michigan from north point light to wind point wi 5 nm offshore to mid lake- lake michigan from wind point wi to winthrop harbor il 5 nm offshore to mid lake- lake michigan from winthrop harbor to wilmette harbor il 5 nm offshore to mid lake- lake michigan from wilmette harbor il to michigan city in 5 nm offshore to mid lake- lake michigan from whitehall to pentwater mi 5 nm offshore to mid lake- lake michigan from grand haven to whitehall mi 5 nm offshore to mid lake- lake michigan from holland to grand haven mi 5 nm offshore to mid lake- lake michigan from south haven to holland mi 5 nm offshore to mid lake- lake michigan from st. Joseph to south haven mi 5 nm offshore to mid lake- 906 pm cdt Fri apr 25 2025
sheboygan wi to pentwater mi south - .
Rest of tonight - North winds to 30 kt. Slight chance of rain showers through early evening. Waves 6 to 9 ft occasionally to 12 ft building to 8 to 11 ft occasionally to 14 ft.
Saturday - North winds to 30 kt diminishing to 15 to 25 kt. Waves 7 to 10 ft occasionally to 13 ft subsiding to 4 to 7 ft occasionally to 9 ft.
Saturday night - North winds 10 to 20 kt diminishing to 10 to 15 kt late in the evening, then becoming northeast 5 to 10 kt overnight. Waves 4 to 6 ft occasionally to 8 ft subsiding to 2 to 4 ft.
Sunday - East winds 5 to 10 kt becoming southeast 10 to 15 kt. Waves 1 to 2 ft.
Sunday night - Southeast winds 10 to 15 kt becoming south 10 to 20 kt. Waves 1 to 2 ft building to 2 to 4 ft.
Monday - South winds 15 to 25 kt increasing to 30 kt. Waves 4 to 7 ft occasionally to 9 ft building to 6 to 9 ft occasionally to 12 ft.
Monday night - South winds to 30 kt. Showers likely. Waves 6 to 9 ft occasionally to 12 ft.
Tuesday - Southwest winds to 30 kt becoming west 15 to 25 kt. Chance of showers. Waves 6 to 9 ft occasionally to 12 ft.
Wednesday - North winds 10 to 15 kt increasing to 10 to 20 kt. Waves 2 to 4 ft.
open lake forecast for lake michigan national weather service milwaukee/sullivan wi 906 pm cdt Fri apr 25 2025
for waters beyond 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 wave, along with the average height of the highest 10% of the waves which will occasionally be encountered.
strong high pressure around 30.3 inches will move slowly into the region overnight into Saturday. Brisk north winds will continue over the lake into Saturday morning, with a few gale force gusts possible. Winds will subside north to south Saturday afternoon, as the high builds in. Light and variable winds under the high are expected Saturday night into Sunday morning.
low pressure around 29.3 inches will then track from south dakota to lake superior on Monday, with breezy southerly winds over lake michigan Monday morning into Monday night. The associated cold front will cross the region on Tuesday, with winds veering from southwest to northwest as it passes. North winds will weaken into Tuesday night, with high pressure around 30.3 inches moving into the region. Light and variable winds should occur on Wednesday.
lmz080-669-671-673-675-777-779-870-872-874-876-878-260930- lake michigan from michigan city in to st. Joseph mi 5 nm offshore to mid lake- lake michigan from sheboygan to port washington wi 5 nm offshore to mid lake- lake michigan from port washington to north point light wi 5 nm offshore to mid lake- lake michigan from north point light to wind point wi 5 nm offshore to mid lake- lake michigan from wind point wi to winthrop harbor il 5 nm offshore to mid lake- lake michigan from winthrop harbor to wilmette harbor il 5 nm offshore to mid lake- lake michigan from wilmette harbor il to michigan city in 5 nm offshore to mid lake- lake michigan from whitehall to pentwater mi 5 nm offshore to mid lake- lake michigan from grand haven to whitehall mi 5 nm offshore to mid lake- lake michigan from holland to grand haven mi 5 nm offshore to mid lake- lake michigan from south haven to holland mi 5 nm offshore to mid lake- lake michigan from st. Joseph to south haven mi 5 nm offshore to mid lake- 906 pm cdt Fri apr 25 2025
sheboygan wi to pentwater mi south - .
LMZ700
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7 Day Forecast for Marine Location Near Dune Acres, IN

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Area Discussion for Chicago, IL
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FXUS63 KLOT 252319 AFDLOT
Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 619 PM CDT Fri Apr 25 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 /00Z TAFS THROUGH 06Z SATURDAY/
Issued at 620 PM CDT Fri Apr 25 2025
Aviation forecast concerns for the 00Z TAFs:
- Blustery N to NE winds into Saturday, with gusts 25 kts or slightly higher tonight gradually easing tomorrow.
- Period of MVFR ceilings likely from mid-evening into late morning/midday Saturday.
Surface low pressure was over south-central lower Michigan early this evening, with a cold front trailing southwest across IN/southern IL. Blustery north winds gusting 25-30 kt were occurring on the back side of this departing low, and will persist tonight before gradually easing through the day Saturday. Wind direction is currently NNE for ORD/MDW, but may back to 350-ish for a time later tonight before shifting more NNE and NE Saturday. Northeast winds should diminish quickly Saturday evening as surface high pressure approaches.
Cloud wise, an extensive area was upstream across WI, and should spread back into the terminals through early-mid evening. Bases may initially be below 1500 ft, but will likely gradually rise late tonight into Saturday morning before eventually scattering to VFR by midday/early afternoon. Can't rule out some brief IFR bases along/over Lake Michigan which could affect KGYY later this evening. Also may be a few isolated sprinkles along/north of about the I-90 corridor from KRFD to KORD this evening, though nothing which should be of any significance.
Ratzer
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 619 PM CDT Fri Apr 25 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 /00Z TAFS THROUGH 06Z SATURDAY/
Issued at 620 PM CDT Fri Apr 25 2025
Aviation forecast concerns for the 00Z TAFs:
- Blustery N to NE winds into Saturday, with gusts 25 kts or slightly higher tonight gradually easing tomorrow.
- Period of MVFR ceilings likely from mid-evening into late morning/midday Saturday.
Surface low pressure was over south-central lower Michigan early this evening, with a cold front trailing southwest across IN/southern IL. Blustery north winds gusting 25-30 kt were occurring on the back side of this departing low, and will persist tonight before gradually easing through the day Saturday. Wind direction is currently NNE for ORD/MDW, but may back to 350-ish for a time later tonight before shifting more NNE and NE Saturday. Northeast winds should diminish quickly Saturday evening as surface high pressure approaches.
Cloud wise, an extensive area was upstream across WI, and should spread back into the terminals through early-mid evening. Bases may initially be below 1500 ft, but will likely gradually rise late tonight into Saturday morning before eventually scattering to VFR by midday/early afternoon. Can't rule out some brief IFR bases along/over Lake Michigan which could affect KGYY later this evening. Also may be a few isolated sprinkles along/north of about the I-90 corridor from KRFD to KORD this evening, though nothing which should be of any significance.
Ratzer
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 |
BHRI3 - Burns Harbor, IN | 16 mi | 39 min | N 12G | 44°F | 30.09 | |||
MCYI3 - Michigan City, IN | 18 mi | 49 min | NNW 27G | 43°F | 30.06 | 43°F | ||
CHII2 - Chicago, IL | 20 mi | 29 min | N 36G | 51°F | 51°F | |||
CMTI2 - 9087044 - Calumet, IL | 20 mi | 49 min | NNW 15G | 45°F | 30.09 | 44°F | ||
CNII2 | 22 mi | 64 min | N 19G | 45°F | 42°F | |||
OKSI2 | 23 mi | 139 min | N 12G | 47°F | ||||
45026 - St. Joseph, MI | 32 mi | 39 min | N 29G | 43°F | 46°F | 9 ft | 30.05 | 38°F |
WHRI2 - Waukegan Harbor, IL | 47 mi | 79 min | NNW 9.9G | 46°F |
Wind History for Calumet Harbor, IL
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Airport Reports
Link to 1 hour of 5 minute data for KGYY
Terminal Aerodrome Forecast (TAF) for KGYY
Wind History Graph: GYY
(wind in knots)GEOS Local Image of great lakes
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Chicago, IL,

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