hazardous weather. tornadoes let’s learn about wichita-andover tornado april 26, 1991 - 55...
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Hazardous Weather
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TORNADOESLet’s learn about
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Wichita-Andover Tornado April 26, 1991
- 55 tornadoes were part of an outbreak- 30 were F2 or larger- this was the strongest of them – F5
City of Andover - one ambulance in city - its only tornado siren didn’t work - no emergency management office
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For how long a time period was the tornado on the ground?
1 hour 13 minutes or 73 minutes
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Towards what general direction (southeast, southwest, northwest, northeast) did the tornado move ?
northeast
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What was the length of the tornado path?
47 miles
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What was the average ground speed of the tornado?
47 mi/1.2 hrs = 39 mi/hr
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Based on the scale provided and the path drawnon the map, which of the following was most likelythe maximum width of the tornado: 30 feet,300 feet, 3,000 feet, 3 miles?
3,000 feet
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Of the 19 deaths resulting from the episode of serve weather described in this activity, 15 occurred in mobile homes. Thirteen died at the Golden Spur Mobile Home Park shown on the map. What are some of the special dangers of mobile home living?
The structures are not strong and not anchored to theground in the same manner as traditional homes. The homedensity is higher than for more traditional homes.
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What special precautions should mobile homeparks and residents take to reduce severeweather threats?
There should be a central underground shelter or other type of shelter. Transportationneeded for the elderly residents.
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Andover Today - county emergency management office - Golden Spur Mobile Park rebuilt and renamed Andover Estates - Schools and public buildings now have “safe rooms” - McConnell Air Force Base rebuilt
Lessons learned were helpful on May 3, 1999 when another powerful tornado swept through the area of Wichita.
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TORNADOESMore about
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Thunderstorms
• Thunderstorms develop when the air is very unstable
• Some thunderstorms will develop into supercells
• Tornadoes may form within supercells
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Tornadoes
• associated with severe thunderstorms
• “tornado season” is the Spring• extremely low air pressure
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Lwarm air
moist aircold air
cool air
Weather conditions that favor tornado development
severe thunderstorms
dry, cool air
warm, moist air
Side view
Moist air is lifted by approaching dry air which creates very unstable conditions.
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Wind shear: winds move in different directions as altitude increases. This causes the air toroll horizontally.
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A strong updraft will tilt the horizontally rolling air into a vertical position creating what iscalled a mesocyclone.The falling rain creates a downdraft and the wall cloud forms. The moist air condenses toform a funnel which is the tornado.
Tornado development
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Cool air from the downdraft eventually chokes off the energy supply for the tornadoand it dies out.
Tornado demise
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One interesting read about hazardous weather
“Warnings” by Mike Smith
Easy-to-follow explanationof why and how meteorologistsdeveloped our modern systemfor observing, predicting, andforecasting severe weather,written by one of the experts
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Hazardous WeatherHazardous Weather
NESTA workshop