TODAY’S VOCABULARY
• HURRICANE: Tropical storm with wind speeds in excess of 74 mph.
METEOROLOGY UNIT
Violent Weather - Hurricanes
VIOLENT WEATHER…..
• http://video.nationalgeographic.com/video/101-videos/hurricanes-101
• http://video.nationalgeographic.com/video/101-videos/tornadoes-101
• http://video.nationalgeographic.com/video/101-videos/lightning
PARTS OF A HURRICANE
• Start off as a tropical storm off coast of Africa
• Named when winds >39 mph
• Hurricane when winds >74 mph
PARTS OF A TORNADO
• Funnel Cloud• Center part
sometimes called the ‘vortex’
• Drops out of supercell thunderstorms
CLASSIFTYING HURRICANESSaffir Simpson Scale
•Category 1: Winds of 64-82 knots (74-95 mph)Very dangerous winds will produce some damage•Category 2: Winds of 83-95 knots (96-110 mph)Extremely dangerous winds will cause extensive damage•Category 3: Winds of 96-113 knots (111-129 mph)Devastating damage will occur•Category 4: Winds of 114 to 135 knots (130-156 mph)Catastrophic damage will occur•Category 5: Winds above 135 knots (157 mph)Catastrophic damage will occur
CLASSIFYING TORNADOESFUJITA SCALE•F-0 40-72 mph, Light damage, chimney damage, tree branches broken•F-1 73-112 mph, Moderate damage, mobile homes pushed off foundation or flipped over•F-2 113-157 mph, Considerable damage, mobile homes demolished, trees uprooted•F-3 158-205 mph, Severe damage, roofs and walls torn down, trains overturned, cars thrown around•F-4 207-260 mph, Devastating damage, well-constructed walls leveled•F-5 261-318 mph, Violent damage, homes lifted off foundation and carried considerable distances, autos thrown as far as 100 meters.
TORNADOES
• Small• Forms over land• Spring• Lasts a few minutes• Highest wind speeds – 300 mph• ? Dies out• F0 – F5Damage from wind, hail
HURRICANES• Large• Forms over tropical waters• Late summer/fall• Can last days• Highest wind speeds --- 160 mph • Dies out over land / cold water• Category 1-5Damage from wind, water (storm
surge) , can spawn tornadoes
More facts…..
TORNADO• Forms from supercell
thunderstorms• The greater the difference
in air pressure between high and low and pressure air masses, the more likely a tornado will result
• Center is low pressure• Circulate counter clockwise
HURRICANE• Ocean warmer than 26 oC• Low pressure in center
great enough, storm starts to spin into the center
• Circulate counter clockwise• Dissipate over land and/or
cold water
TODAY’S ACTIVITY
• TRACKING HURRICANES
TICKET OUT THE DOOR
• Hurricanes that hit the Southeast United States start …………………