Analysis of the 7 February Event

Note: results on this page represent work in progress and caution should be excercised in their interpretation

 

Summary

Dual-Doppler analyses were conducted during the 1530-1810 UTC period. This time period captured the evolution from a relatively unorganized cumulus field (1530 UTC) to a linear band feature (1630 UTC) with a northwest-southeast orientation. The line was > 100 km long at this point with a significant portion extending outside the dual-Doppler lobes. As the line moved toward the southwest, new cells formed out ahead of the line (20-30 km) in an orientation roughly parallel to the main linear band. Between 1700 and 1730 UTC, the newer cells out ahead of the line intensified and solidified into another linear feature while the main portion of the band weakened in its wake. The system continued progression toward the southwest between 5-7 m/s. The "new" line contained a trailing region of decaying convection (the previous linear band), which broadened the overall feature considerably in many places along the line. The line eventually lengthened to over 200 km, mostly as a consequence of convection along the southern margin (south of S-Pol). Despite its length, the band remained rather loosely organized, eventually breaking up into discrete aggregates of cells.

 

Radar Analysis

Profiler Plots (courtesy of the NOAA Aeronomy Laboratory)

Abracos Hill Surface Measurements (courtesy of Galdino Mota at University of Utah)

Tethersonde Measurements (courtesy of Galdino Mota at University of Utah)

 

 

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