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<br />002507 <br /> <br />(2) Case studies have been performed on selected days. Analyses <br />have developed relationships between mesoscale features and have <br />identified factors significantly influencing convection, such <br />as wet bulb potential temperature field and its associated verti- <br />cal velocity field. <br /> <br />(3) Decision-tree development concentrated on determining which <br />mesoscale and synoptic features correlate most significantly with <br />convective development. <br /> <br />(4) A climatology of severe weather warnings was completed, using <br />information from the National Weather Service local warning system <br />and the NSSL (National Severe Storms Laboratory). The study <br />indicates that warnings are issued on 20 to 60 percent of the days <br />during a summer field season and that six to seven local warnings <br />are issued for each one issued by NSSL. <br /> <br />(5) The contractor has developed algorithms for the automatic <br />detection and tracing of rain cells for processing digital weather <br />radar data. The radar cells are defined by contours 3 dB below <br />enclosed reflectivity peaks which do not enclose other cells. <br />Cell attributes such as reflectivity area and location are com- <br />puted and compiled. <br /> <br />CONTRACTOR: Meteorology Research, Inc., Altadena, California <br />CONTRACT NO. 14-06-D-7699 <br />PRINCIPAL INVESTIGATOR: Theodore B. Smith <br />PERIOD: May 15, 1975 ~ Continuing <br />FUNDING: FY75 - $ 16,726 <br />FY76 - $287,698 <br />T.Q. - $ 99,883 <br />FY77 - $316,625 <br />FY78 - $312,126 <br /> <br />'This contract provided research personnel, an instrumented atmos- <br />pheric research aircraft, and aircraft data reduction and analyses <br />for HIPLEX. In 1975, an instrumentation package designed around a <br />digital recording system was constructed for the MRI Piper Navajo. <br />This aircraft was used at HIPLEX sites for the summer seasons of <br />1975-78, and the aircraft data set provided useful information on <br />cloud characteristics at all three HIPLEX sites. <br /> <br />In 1976, the aircraft system was modified for major improvements in <br />real-time display capabilities by installing an onboard minicomputer. <br />A postflight tape copying ability was also implemented. Improved <br />software capability permitted better data quality control. During <br /> <br />111-20 <br />