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SITE-SPECIFIC HEALTH AND SAFETY PLAN FOR WELL INSTALLATIONS <br />Other Site Hazards <br />May 4, 2017 <br />ThUilder(orro, A thunderstorm, a lightning storm, thundershower or simply <br />a storm, is a form of turbulent weather characterized by the <br />presence of lightning and its acoustic effect on the Earth's <br />Sal& t Y <br />atmosphere known as thunder. Thunderstorms are usually <br />accompanied by strong winds, heavy rain and sometimes <br />snow, sleet, hail, or no precipitation at all. Thunderstorms <br />may line up in a series or rainband, known as a squall line. <br />Strong or severe thunderstorms may rotate, known as supercells. Thunderstorms result from the <br />rapid upward movement of warm, moist air. They can occur inside warm, moist air masses and <br />at fronts. <br />Thunderstorms can generally form and develop in any <br />particular geographic location, perhaps most frequently <br />within areas located at mid-latitude when warm moist air <br />collides with cooler air. Thunderstorms are responsible for <br />the development and formation of many severe weather <br />phenomena.. Damage that results from thunderstorms is <br />mainly inflicted by downburst winds, large hailstones, and <br />flash flooding caused by heavy precipitation. Stronger <br />thunderstorm cells are capable of producing tornadoes <br />and waterspouts. <br />Most thunderstorms come and go fairly uneventfully; however, any thunderstorm can become <br />severe, and all thunderstorms, by definition, present the danger of lightning. <br />Below is a list of safety precautions to employ when thunderstorms approach during field <br />activities. <br />Know the names of local counties, cities, and towns, as these are how warnings are <br />described. <br />Monitor forecasts and know whether thunderstorms are likely in the area. <br />Cancel or reschedule outdoor events (to avoid being caught outdoors when a storm <br />hits) <br />Avoid open areas like hilltops, fields, and beaches. <br />Recognize the signs of an oncoming thunder and lightning storm. Keep an eye at the sky. <br />Look for darkening skies, flashes of lightning, or increasing winds. Lightning often <br />proceeds rain, so don't wait for the rain to begin. If you hear the sound of thunder, go to <br />a safe place immediately. <br />Should a thunderstorm arise during field activities the following steps should be implemented: <br />STOP WORK - the moment you hear the sound of thunder. <br />SEEK SHELTER <br />Look for a large, enclosed building when a thunder or lightning storm threatens. That's the <br />best choice. <br />If you are in a car and it has a hard top, stay inside and keep the windows rolled up. <br />25