812-Lancast*r Farming, Saturday, November 30,1985 V (Continued from Page BIO) says. “We know that nature is somehow creating an impulsive downflow. One ingredient is the right-size raindrops.” Sometimes the clouds are high, above 10,000 feet, and the raindrops evaporate before reaching the ground, making the downdraft invisible, he explains. This evaporation con dition is known as virga. More urgent is setting up a system to alert pilots to the in visible danger. In his book “The Downburst,” published this year, Fujita wrote that radar in operation at airports rarely detects microburst winds because the microbursts are small, short KATOLIGHT! THE PIONEER IN BRUSHLESS P.T.O. ALTERNATORS!! YEARS OF * If EXPERIENCE HAVE GONE INTO THE .p-s. •|J ADVANCED DESIGN OF THESE \ \ ''Jfi POWERFUL BRUSHLESS ** . . \joPr ALTERNATORS. THE RESULT IS THE JT UNIQUE COMBINATION 0F... * 300% Surge Capacity: For iSy Superior motor starting capabilities 24 HR. 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Wind shear lived, and strongest very close to the ground, where radar echoes can be contaminated by ground “clutter.” A more sophisticated Doppler radar system either at airports or on planes would be effective, Fujita and McCarthy agree. Doppler (which police use to clock the speed of cars) was used for the experiment at Denver. Fujita will be testing detection methods at Huntsville, Ala., next summer. But Doppler is not likely to be installed, even at high-risk air ports, before 1990. In the meantime, McCarthy says, pilots can be trained to watch for certain telltale signs of dry microbursts: high cumulus clouds, U.V. Light Safety Shut Off Feed Pumps Chlorine Pellet Feeders lodine Feeders Iron Filters Taste and Odor Filters Dirt and Sediment Filters Hot Water Heaters Salt and Supplies virga on the radar, and dust kicking up on the ground. Other microbursts may be hidden in thunderstorms. “But a pilot can’t avoid every shower,” Fujita points out. Techniques for Survival With enough accurate warning, a pilot may be able to go around a microburst, abort a landing, or stay on the runway in a takeoff situation. The airlines also are teaching techniques for suc cessfully flying through one. Although microbursts didn’t have a name until recently, they have been around for eons everywhere in the world except the coldest regions, Fujita says. Their existence was not considered alarming until the jet age. But microbursts have claimed victims on the ground too. Like a steamroller, they have flattened stands of pines in Maine and fields of corn in Indiana. Call Us For This Month's Factory Special Prices !WAM«PSUBi«'riI)T»!!S...THE AMERICAN FARMER TBE REALTHING! WE ARE PROUD TO SERVE YOU. 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