Marine Weather and Tide Forecast for Beloit, WI
April 25, 2025 11:20 PM CDT (04:20 UTC)
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 | Sunrise 5:57 AM Sunset 7:50 PM Moonrise 4:43 AM Moonset 5:29 PM |
LMZ646 Wind Point Wi To Winthrop Harbor Il- 1105 Pm Cdt Fri Apr 25 2025
.small craft advisory in effect through Saturday afternoon - .
Rest of tonight - North wind 15 to 25 knots becoming 15 to 20 knots early in the morning. Gusts up to 30 knots. Mostly cloudy. Waves 4 to 6 feet.
Saturday - North wind 15 to 20 knots easing to 10 to 15 knots late in the afternoon. Gusts up to 25 knots. Partly Sunny in the morning then clearing. Waves 3 to 5 feet subsiding to 3 to 4 feet in the late morning and afternoon.
Saturday night - North wind 10 to 15 knots easing to 5 to 10 knots in the late evening and early morning, then veering northeast early in the morning. Mostly clear. Waves 2 to 4 feet subsiding to 1 to 2 feet after midnight.
Sunday - East wind 5 to 10 knots veering southeast late in the morning, then rising to 10 to 15 knots early in the afternoon becoming southeast 10 to 15 knots late in the afternoon. Partly Sunny. Waves around 1 foot.
LMZ600
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7 Day Forecast for Marine Location Near Beloit, WI
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Area Discussion for Milwaukee/Sullivan, WI
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FXUS63 KMKX 260228 AAA AFDMKX
Area Forecast Discussion...UPDATED National Weather Service Milwaukee/Sullivan WI 928 PM CDT Fri Apr 25 2025
KEY MESSAGES
- Potential for strong to severe thunderstorms Monday into Tuesday (risk level 3 out of 5 in the west, risk level 2 in the east). Initial indications are that this activity will peak late Monday/Monday night, and all hazard types are on the table.
- High temperatures may warm to near 80 degrees Fahrenheit for Monday, cooling back off towards the middle of next week.
UPDATE
Issued 928 PM CDT Fri Apr 25 2025
Low clouds will continue to linger into the overnight hours, gradually clearing out northwest to southeast into Saturday morning with cold air advection bringing dry air into the region. Gusty north winds overnight will shift northeast Saturday morning, weakening by the afternoon. Sunny skies are expected Saturday, with high pressure moving into the region.
Lows in the middle 30s northwest to around 40 far southeast are expected tonight, with highs Saturday in the lower 60s west with 50s closer to Lake Michigan.
Wood
SHORT TERM
Issued 350 PM CDT Fri Apr 25 2025
Tonight through Saturday night:
Low pressure will continue east from southern Michigan this evening, with strong high pressure chasing it out. Any lingering showers will gradually clear out west to east over the next several hours, leaving us dry with low clouds overnight. Brisk north winds carry in cooler air, with a low temp in the mid to upper 30s expected.
Low clouds clear out from west to east Saturday morning as high pressure continues to build in, leaving us with sunny skies and slower north to northeast winds by the afternoon. High temps around 60 far inland (Madison / Janesville / WI Dells), closer to 50 degrees further east towards the lakeshore given that Lake MI water temps are still in the low 40s (based on GLERL analysis). Temperatures plunge to a low in the 30s again Saturday night under mostly clear skies.
Sheppard
LONG TERM
Issued 350 PM CDT Fri Apr 25 2025
Sunday through Friday:
Sunday: As high pressure exits the region eastward and low pressure deepens over the central / northern Plains on Sunday, a south breeze develops. Coupled with partly cloudy skies, this allows temps to climb to the low to mid 60s inland, with 50s along the Lake MI shoreline. Models resolve some light showers nearby Sunday ahead of the approaching low (associated with intensifying WAA), though the majority of the precip chances do hold off until late Sunday night.
Monday: South winds become gusty soon after sunrise Monday, plunging us deeper into the warm sector of the approaching low pressure.
Global models (12z GFS and 06z ECMWF) are producing impressive CAPE and helicity values (in some cases over 1500 joules and over 300 m2/s2) by 00z Monday, particularly for areas west of Madison. Southwesterly winds in the jet produce 45 kts or more of 0-6km bulk shear, increasing into the evening and overnight.
Obviously, higher resolution models will be needed to properly analyze the parameter space, but early indications are that the warm sector of this low pressure system carries an all-hazards severe weather threat, with the highest threat west of a Janesville to Berlin WI line (level 3 out of 5 risk), with only a level 2 out of 5 risk further east. Widespread 20 to 50% precip chances are in the forecast through the daytime hours of Monday as strong moisture transport and WAA from the low level jet unfolds, followed by 60 to 85% Monday evening and night (featuring stronger jet winds aloft and thus higher shear, but weaker low- level thermodynamics) as the low pressure system tracks across Lake Superior.
Tuesday: The cold front extending southwest of the low passes Tuesday morning, allowing for continued chances for showers / thunderstorms. Thermodynamics along the front are weaker than the Monday and Monday night, and the timing of the frontal passage (as seen in models) leaves little time for diurnal destabilization, perhaps a bit in southeastern WI only. Hence, Tuesday's storm threat is looking mostly sub-severe for now, though conditionally dependent on the arrival time of the front and the amount of instability expended by overnight convection (both of which could be subject to change). Winds remain gusty behind the front, but taper down later Tuesday along with rain chances as high pressure builds into the Great Lakes region.
Wednesday and onwards: Dry weather looking likely for Wednesday under the high pressure system. A light east breeze off the lake keeping lakeshore areas cooler. Low pressure system from the Texas panhandle passes south of us late next week, with potential for a clipper system overhead as well. Hence, broad-brushed 20-40% rain chances for late next week. Inland high temps in the 60s looking likely, cooler by the shoreline.
Sheppard
AVIATION
Issued 928 PM CDT Fri Apr 25 2025
Low ceilings in the 1200 to 1500 foot AGL range will continue to linger into the overnight hours, gradually clearing out northwest to southeast into Saturday morning. Gusty north winds overnight will shift northeast Saturday morning, weakening by the afternoon with high pressure moving into the region. Light winds linger into Saturday evening.
Wood
MARINE
Issued 928 PM CDT Fri Apr 25 2025
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.
A Small Craft Advisory remains in effect until 7 AM CDT Saturday north of North Point Lighthouse, and until 4 PM CDT Saturday south of there, for gusty north winds and elevated waves.
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.
Wood
MKX WATCHES/WARNINGS/ADVISORIES
WI...None.
LM
Small Craft Advisory
LMZ643-LMZ644 until 7 AM Saturday.
Small Craft Advisory...LMZ645-LMZ646 until 4 PM Saturday.
Area Forecast Discussion...UPDATED National Weather Service Milwaukee/Sullivan WI 928 PM CDT Fri Apr 25 2025
KEY MESSAGES
- Potential for strong to severe thunderstorms Monday into Tuesday (risk level 3 out of 5 in the west, risk level 2 in the east). Initial indications are that this activity will peak late Monday/Monday night, and all hazard types are on the table.
- High temperatures may warm to near 80 degrees Fahrenheit for Monday, cooling back off towards the middle of next week.
UPDATE
Issued 928 PM CDT Fri Apr 25 2025
Low clouds will continue to linger into the overnight hours, gradually clearing out northwest to southeast into Saturday morning with cold air advection bringing dry air into the region. Gusty north winds overnight will shift northeast Saturday morning, weakening by the afternoon. Sunny skies are expected Saturday, with high pressure moving into the region.
Lows in the middle 30s northwest to around 40 far southeast are expected tonight, with highs Saturday in the lower 60s west with 50s closer to Lake Michigan.
Wood
SHORT TERM
Issued 350 PM CDT Fri Apr 25 2025
Tonight through Saturday night:
Low pressure will continue east from southern Michigan this evening, with strong high pressure chasing it out. Any lingering showers will gradually clear out west to east over the next several hours, leaving us dry with low clouds overnight. Brisk north winds carry in cooler air, with a low temp in the mid to upper 30s expected.
Low clouds clear out from west to east Saturday morning as high pressure continues to build in, leaving us with sunny skies and slower north to northeast winds by the afternoon. High temps around 60 far inland (Madison / Janesville / WI Dells), closer to 50 degrees further east towards the lakeshore given that Lake MI water temps are still in the low 40s (based on GLERL analysis). Temperatures plunge to a low in the 30s again Saturday night under mostly clear skies.
Sheppard
LONG TERM
Issued 350 PM CDT Fri Apr 25 2025
Sunday through Friday:
Sunday: As high pressure exits the region eastward and low pressure deepens over the central / northern Plains on Sunday, a south breeze develops. Coupled with partly cloudy skies, this allows temps to climb to the low to mid 60s inland, with 50s along the Lake MI shoreline. Models resolve some light showers nearby Sunday ahead of the approaching low (associated with intensifying WAA), though the majority of the precip chances do hold off until late Sunday night.
Monday: South winds become gusty soon after sunrise Monday, plunging us deeper into the warm sector of the approaching low pressure.
Global models (12z GFS and 06z ECMWF) are producing impressive CAPE and helicity values (in some cases over 1500 joules and over 300 m2/s2) by 00z Monday, particularly for areas west of Madison. Southwesterly winds in the jet produce 45 kts or more of 0-6km bulk shear, increasing into the evening and overnight.
Obviously, higher resolution models will be needed to properly analyze the parameter space, but early indications are that the warm sector of this low pressure system carries an all-hazards severe weather threat, with the highest threat west of a Janesville to Berlin WI line (level 3 out of 5 risk), with only a level 2 out of 5 risk further east. Widespread 20 to 50% precip chances are in the forecast through the daytime hours of Monday as strong moisture transport and WAA from the low level jet unfolds, followed by 60 to 85% Monday evening and night (featuring stronger jet winds aloft and thus higher shear, but weaker low- level thermodynamics) as the low pressure system tracks across Lake Superior.
Tuesday: The cold front extending southwest of the low passes Tuesday morning, allowing for continued chances for showers / thunderstorms. Thermodynamics along the front are weaker than the Monday and Monday night, and the timing of the frontal passage (as seen in models) leaves little time for diurnal destabilization, perhaps a bit in southeastern WI only. Hence, Tuesday's storm threat is looking mostly sub-severe for now, though conditionally dependent on the arrival time of the front and the amount of instability expended by overnight convection (both of which could be subject to change). Winds remain gusty behind the front, but taper down later Tuesday along with rain chances as high pressure builds into the Great Lakes region.
Wednesday and onwards: Dry weather looking likely for Wednesday under the high pressure system. A light east breeze off the lake keeping lakeshore areas cooler. Low pressure system from the Texas panhandle passes south of us late next week, with potential for a clipper system overhead as well. Hence, broad-brushed 20-40% rain chances for late next week. Inland high temps in the 60s looking likely, cooler by the shoreline.
Sheppard
AVIATION
Issued 928 PM CDT Fri Apr 25 2025
Low ceilings in the 1200 to 1500 foot AGL range will continue to linger into the overnight hours, gradually clearing out northwest to southeast into Saturday morning. Gusty north winds overnight will shift northeast Saturday morning, weakening by the afternoon with high pressure moving into the region. Light winds linger into Saturday evening.
Wood
MARINE
Issued 928 PM CDT Fri Apr 25 2025
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.
A Small Craft Advisory remains in effect until 7 AM CDT Saturday north of North Point Lighthouse, and until 4 PM CDT Saturday south of there, for gusty north winds and elevated waves.
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.
Wood
MKX WATCHES/WARNINGS/ADVISORIES
WI...None.
LM
Small Craft Advisory
LMZ643-LMZ644 until 7 AM Saturday.
Small Craft Advisory...LMZ645-LMZ646 until 4 PM Saturday.
Wind History for Calumet Harbor, IL
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Link to 1 hour of 5 minute data for KJVL
Terminal Aerodrome Forecast (TAF) for KJVL
Wind History Graph: JVL
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GEOS Local Image of great lakes
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Milwaukee, WI,
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