The University of Wisconsin Convective Initiation (UWCI) detected vertically growing and hence cooling clouds along a dryline along the Texas/Oklahoma border at 1903 UTC 19 May 2010. This first indication of convective initiation is shown in the figure. The CI nowcast category '1' is indicative of cooling warm water cloud. An inspection of the Norman, OK NWS 0.5 degree base reflectivity shows the UWCI algorithm provided 13 minute lead-time over the first 35+ dBZ radar echo. Given the distance of the storm from the Norman radar, the first 35+ dBZ radar echo was indicated at 1916 UTC occurred at approximately 17,000 feet above ground level. The UWCI algorithm continued to show significant cooling rates and more mature CI nowcast categories in subsequent satellite scans. Further updates will be provided as time warrants.
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