Thunderstorms Bring Dangerous Conditions to Nearshore and Open Waters off Southeastern Wisconsin
A Special Marine Warning has been issued for portions of Lake Michigan, including:
- Lake Michigan from North Point Light to Wind Point, Wisconsin, 5 nautical miles offshore to Mid Lake
- Lake Michigan from Port Washington to North Point Light, Wisconsin, 5 nautical miles offshore to Mid Lake
Strong thunderstorms moving across southeastern Wisconsin are creating hazardous conditions for boaters with the potential for wind gusts of 34 knots or greater, dangerous lightning, torrential rainfall, and rough waves. Mariners should immediately seek safe harbor if possible, as rapidly changing weather conditions can make navigation extremely dangerous.
Dangerous Marine Conditions
Thunderstorms over Lake Michigan are capable of producing:
- Wind gusts exceeding 34 knots
- Frequent cloud-to-water lightning
- Reduced visibility in heavy rainfall
- Rapidly building waves
- Dangerous conditions for small boats and recreational watercraft
Conditions can deteriorate within minutes, leaving little time for boaters to react.
Additional Marine Hazards Expected
Even after thunderstorms move away, hazardous boating conditions are expected to continue as strong northerly winds develop over Lake Michigan. Marine forecasts call for:
- North winds up to 30 knots
- Waves building to 7 to 10 feet, occasionally higher
- Hazardous conditions for small craft across much of the Wisconsin nearshore waters
Boater Safety Tips
If you are on Lake Michigan:
- Head to the nearest safe harbor immediately when thunderstorms approach.
- Stay off open water until storms have completely passed.
- Wear a properly fitted U.S. Coast Guard-approved life jacket.
- Monitor NOAA Weather Radio or trusted marine weather sources for updated warnings.
- Never attempt to outrun a severe thunderstorm across open water.
Stay Weather Aware
Boaters and anyone planning activities along the southeastern Wisconsin shoreline should closely monitor the latest forecasts and marine warnings as thunderstorms continue to move across the region. Conditions on Lake Michigan can become life-threatening with very little warning.
Radar Watch HQ will continue providing updates on severe weather, marine warnings, and hazardous conditions affecting the Great Lakes region.
Follow Radar Watch HQ for the latest marine warnings, severe weather alerts, and real-time updates to help keep you and your family safe on the water.
Radar Watch HQ Top 5 Marine Essentials
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🌊 1. U.S. Coast Guard-Approved Life Jacket
A properly fitted life jacket is the most important piece of safety equipment for every passenger onboard.
Best for: Recreational boaters, anglers, kayakers, and paddleboarders.
⚓ 2. Marine Emergency Radio (NOAA Weather Radio)
Receive real-time NOAA Weather Radio alerts, marine forecasts, and emergency warnings—even when cell service is unavailable.
Best for: Offshore and coastal boating.
🔦 3. Rechargeable Waterproof LED Flashlight
A bright waterproof flashlight is essential for emergencies, low visibility, nighttime navigation, and signaling for help.
Best for: Every boat emergency kit.
🧰 4. Marine First Aid Kit
A waterproof first aid kit stocked with bandages, antiseptic, medications, and emergency supplies for injuries on the water.
Best for: Every vessel, regardless of size.
🧭 5. Waterproof Dry Bag
Protect phones, wallets, charts, keys, electronics, and emergency supplies from water damage during storms or rough seas.
Best for: Boaters, kayakers, paddleboarders, and beachgoers.
🛒 Radar Watch HQ Marine Safety Picks
Prepare before you head out on the water. Our recommended marine safety essentials can help keep you and your crew safe during changing weather conditions.
