Science for beginners . Fig. 144.—Same tornado, closer view. LOCAL STORMS 187 tornado is very much larger and stronger. The tornado isusually not more than 50 to 500 yards wide. Some have beenonly a few yards, others a mile or more in diameter (, 144 and 145). The rising air currents in a cumulus cloud sometimes meetat the proper angle to throw themselves into a whirl as theygo up through the cloud (much as the water in a wash bowl. Fig. 145.—Shows the base of the funnel of the same tornado whenabout one mile west-northwest of the camera. This view is from theside and somewhat in front
Science for beginners . Fig. 144.—Same tornado, closer view. LOCAL STORMS 187 tornado is very much larger and stronger. The tornado isusually not more than 50 to 500 yards wide. Some have beenonly a few yards, others a mile or more in diameter (, 144 and 145). The rising air currents in a cumulus cloud sometimes meetat the proper angle to throw themselves into a whirl as theygo up through the cloud (much as the water in a wash bowl. Fig. 145.—Shows the base of the funnel of the same tornado whenabout one mile west-northwest of the camera. This view is from theside and somewhat in front, as the storm passed by. throws itself into a whirl as it runs down through the open-ing in the bottom). Occasionally this whirl in the cloudbecomes strong enough to extend itself clear down to theground, and then it is usually marked by a funnel-shapedor tail-like cloud. When the air whirl becomes strong enoughthis funnel cloud reaches to the ground. The stronger thetornado is, the wider the funnel cloud becomes. 199. Damage Done by Tornadoes.—The damage done bya tornado is caused: (1) By the violent winds in the whirl, 188 THE WEATHER which blow perhaps 200 miles or more per hour; and (2)By the low pressure in the core of the tornado. The air ina tornado whirls so fast that it pulls itself away from thecenter, just as a stone pulls on the string when you whirlit around your head. That makes the air pressure less inthe funnel
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectscience, bookyear1921
