Summer storms are the number one weather hazard for recreational boaters. They build fast, hit hard, and catch people off guard because the morning started sunny. Understanding how to monitor, prepare for, and respond to storm conditions is a fundamental boating skill that can save lives.
Check the marine forecast before every trip — NOAA Weather Radio broadcasts continuous forecasts on VHF channels WX1 through WX7. Many chartplotters and marine apps display real-time radar overlays. Set weather alerts on your phone for your boating area.
On the water, watch the sky. Darkening clouds to the west, a rapid drop in temperature, shifting wind direction, and a sudden calm after steady wind are all precursors to a thunderstorm. If you see lightning or hear thunder, the storm is within ten miles and closing fast.
If the time between a lightning flash and thunder is 30 seconds or less, the storm is within six miles — close enough to be dangerous. Begin heading for shelter immediately. Do not return to the water until 30 minutes after the last observed lightning or thunder.
Head for shore if you can reach it safely. If not, reduce speed and head into the waves at a 45-degree angle to prevent swamping or capsizing. Put on life jackets — everyone, no exceptions. Close all hatches and ports. Turn on navigation lights even during daytime to improve your visibility to other boats. Monitor VHF Channel 16 for Coast Guard advisories.
In lightning, keep passengers away from metal objects — towers, railings, and electronics. Disconnect electronics from power if possible to prevent surge damage. Lower outriggers and any tall antennas. If your boat has a cabin, everyone should go below and stay away from metal surfaces.
In building seas, slow down and trim the bow down slightly to keep it from lifting and slamming. Take waves at a 45-degree angle rather than head-on or beam-to (sideways). Head-on waves cause the bow to plunge and can take water over the bow. Beam-to waves cause rolling and risk capsizing in severe conditions. Redistribute weight toward the center and stern for stability.
If visibility drops due to heavy rain, slow to idle and turn on all available lights. Sound your horn at regular intervals to alert nearby vessels of your position.
File a float plan with someone on shore before every trip — include your launch point, destination, expected return time, and number of passengers. If you do not return on time, they know where to direct rescuers. Make sure your VHF radio is charged and that you know how to issue a Mayday call on Channel 16. See our Navigation Markers & Buoys guide for navigational reference.
Thunderstorms can develop from clear skies to dangerous conditions in 30 minutes or less. On large lakes and coastal waters, squall lines can move at 40+ mph. By the time you see the storm, you may have very little time to reach shelter.
Get everyone below deck if your boat has a cabin. If open, have passengers sit low in the center of the boat — avoid touching metal railings, towers, or electronics. Do not anchor in open water where your boat is the tallest object. If possible, move toward shore and seek a substantial building or vehicle.
No. Get everyone out of the water immediately at the first sign of lightning. Water conducts electricity, and a lightning strike on the water surface can be lethal at significant distances from the actual strike point.