BALLISTIC WINDS STUDY
Quarterly rept. no. 2, 1 Jun-31 Aug 1967
TRAVELERS RESEARCH CENTER INC HARTFORD CT
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Space and time variability studies were conducted for the 12-rawin station mesonetwork of southeastern Arizona. The space variability studies showed that for low levels below 1000 meters there was only a slight increase in variability as a function of station separation. The root-mean square space difference of the vector wind RMSSD is 8.0 knots for stations within 20 km of each other, while the RMSSD is 9.6 knots for stations 120-140 km apart. At high levels e.g., 8000 m the variability difference with distance is sizeable. Investigations of time variability indicated the increase in variability with increasing time lag is less at low levels than at high levels. At low levels around 1000 m there is not much difference between a 2-hr old observation and one that is 8 hours old. At about 8,000 meters, the variability increased markedly with increasing time lag. From time variability profiles this is seen to be the level of maximum time variability for all lags with the variability diminishing rapidly with height thereafter.