September 11. Wednesday.
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TOPAZ data were collected from about 0800 to 1915 CDT, bracketing the NASA P-3 and King Air flights and also overlapping with the NASA DC-8 near overpasses at the end of the flight. P3 missed approaches at approximately 1115, 1354, and 1618 CDT. Scattered clouds all day.  Low surface O3 (about 20 ppbv) early, increasing to more than 50 ppbv later neater the surface and more than 70 ppbv aloft. 
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Note: Biases due to clouds have not yet been fully corrected.