Author of report: Mike Douglas

Mission Number: 0300208I

Type of Mission: low-level jet/MCS

Start time of Mission(UTC): 2003/02/08 10:49

End time of Mission(UTC): 2003/02/08 17:40

This flight, the last of SALLJEX, was called to examine a possible MCS development forecast for over northern Argentina or Paraguay. Prior to takeoff satellite imagery showed that a rapidly northward propagating convective system had almost reached Santa Cruz during the night. The flight track was modified during flight to sample this system, which was in a state of decay with mostly stratiform precip. (However the system was responsible for flooding in Santa Cruz.) The modified flight track involved "sawtoothing" southward to the Argentina border to sample the weak southerly flow south of the MCS, and then flying eastward to describe the synoptic-scale structure of the LLJ. The jet was weak, with maximum winds of about 30-35 kts. The flight ended by flying north to near San Ignacio, Bolivia (through widespread, but isolated convection) and then south to Viru-Viru. Maximum winds in this region were near 30 kts at low-levels. The data from this flight will be useful for comparison with the previous day's data - as there are 3 consecutive days describing variability of the LLJ.