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Tornadoes may occur in any month, but they strike most frequently in April, May, and June. Certain conditions appear indispensable: moist, warm air at low levels and cool, dry air at higher levels; a southerly wind at the surface and a strong overriding wind from a different direction Suddenly, from the midst of a thundercloud, a dark funnel lashes out with a twisting elephant’s trunk of whirling air that speeds across the ground, sucking up almost anything in its path. The average tornado meanders only about four miles, but spreads incredible destruction in its wake.
Uproots Trees, Expodes
Houses
Winds estimated at more than 300 miles an hour roar around a core of low air pres sure, turning splinters into deadly missiles, uprooting trees, and hurling people and animals hundreds of yards. A Minnesota twister tossed an 83-ton railroad car and its 117 passengers 80 feet through the air and left them in a ditch. Solid buildings, unable to cope with the sudden drop in pressure, may literally explode as the storm passes over over them. Allen D. Pearson, who heads the Weather Bureau’s National Severe Storms Forecast Center at Kansas City, Missouri, advocates vigorous, community preparednesS-pro
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