SEVERE THUNDERSTORMS. ORDINARY (“AIR MASS”) THUNDERSTORM LIFE CYCLE.

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Presentation transcript:

SEVERE THUNDERSTORMS

ORDINARY (“AIR MASS”) THUNDERSTORM LIFE CYCLE

SEVERE THUNDERSTORM

SHELF CLOUD

ROLL CLOUD

SQUALL LINE THUNDERSTORM

SQUALL LINE

MESOSCALE CONVECTIVE COMPLEX

Derecho 1) Concentrated area of convectively induced wind damage/gusts greater than 50 knots (60 miles per hour) 2) The area must have a major axis length of 400 kilometers. 3) Wind reports should show a continuous and nonrandom pattern of occurrence. For instance, a swath of storms should consistently produce wind reports as the system moves to the east or southeast. 4) In the storm reported areas, at least three reports, separated by 64 km or more, should include wind gusts greater than 64 knots, or 74 mph. 5) Derechos are typically continuous and can sustain itself for hours. With that said, no more than three hours can elapse between successive wind damage eve

DRYLINE

(Eagleman, 206) cP cT mT

(Eagleman, 209)

THUNDERSTORM DAYS PER YEAR

HAIL DAYS PER YEAR

TORNADO!

VERTICAL WIND SHEAR AND VORTEX TUBE

TORNADIC THUNDERSTORM CHARACTERISTICS

Conservation of Angular Momentum angular momentum=mass x velocity x radius

April 3-4, 1974 Super Outbreak

# TORNADOES BY STATE PER YEAR (# TORNADOES PER 10,000 SQ. MILES PER YEAR) “Tornado Alley”

U.S. TORNADOES BY MONTH

JET STREAM AND TORNADO ACTIVITY Winter Jet Spring/Fall Jet Summer Jet

FUJITA TORNADO SCALE

ENHANCED FUJITA TORNADO SCALE

Sharknado