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Thunderstorm Hazards

Thunderstorm Hazards. Lightning Downbursts Flash Floods Hail. Lightning. Discovery Lightning Video (5 mins ) Ground to Cloud Lightning (2 mins ) NOVA Lightning (9 mins ). Cosmic Ray. Downbursts. Macroburst m ore than 4 km (2.5 mi) wide up to 210 km/h (130 mph) winds

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Thunderstorm Hazards

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  1. Thunderstorm Hazards Lightning Downbursts Flash Floods Hail

  2. Lightning • Discovery Lightning Video (5 mins) • Ground to Cloud Lightning (2 mins) • NOVA Lightning (9 mins) Cosmic Ray

  3. Downbursts • Macroburst • more than 4 km (2.5 mi) wide • up to 210 km/h (130 mph) winds • up to 30 mins duration • Microburst • less than 4 km (2.5 mi) wide • up to 270 km/h (170 mph) winds • less than 10 mins duration • Derecho • up to 100s of km (60 mi) long • sustained winds greater than 94 km/h (58 mph) • duration of 10-20 mins

  4. Flash Floods • Short term and localized • High RH and warm cloud base • Note precautions in Table 11.2 p. 346

  5. Hail Supercooled water and ice Recirculation up to 25 times

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