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Special Marine Warning - A warning to mariners of http://nlccga.org/tornado-safety-alerts-tornado-alert-disaster-alert/ risky thunderstorms free weather alerts or squalls with gusts of wind of 34 knots free weather alerts (39 mph or 63 km/h) or more, hail 1-inch (2.7 centimeters) diameter or bigger, or waterspouts lightning alerts .