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<br />, <br /> <br />commence the operation of the hail cannon some 10 minutes before <br />the expected arrival of the potential cloud over the protected area <br />and to continue its operation until the suspect cloud has left the <br />protected area. The implementation of the device is a judgmental <br />decision, arrived at by watching the progress of the cloud thereby, <br />determining its approximate speed to have a minimum of 10 minutes <br />prior to its arrival for activation. The time interval is largely <br />determined by the upper level wind. velocity. rt is to be noted <br />.thaf..th.e :oper.ator..impleniElhting -the.hail maGhine probab'ly wHi have <br />some'l-5 lllinutes to -I hour to view the suspect clouds; their <br />formation and to view its movement and speed toward the protected <br />area, the longer the time of observation the more exact the <br />operator will become in implementing the hail cannon, to achieve <br />--------n~s operat~on oftJle macfi~ne 10 iiili1utes prior to its arrivalat the---u----- <br />protected area. The termination of the operation of the hail <br />cannon would be immediately upon the departure of the cloud from <br />the protected area. The time of operation throughout the year we <br />estimate to be an average of 20 occurrences each and having a <br />duration of 60 minutes for each activation. As noted this <br />is our estimation of the average in a particularly humid summer we <br />might see more instances of activation than the average and in a <br />less than humid summer considerable less' number of activations. <br />