Analysis of the 26 January Squall line

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



An intense squall line with reflectivities exceeding 60 dB and echo tops to 19 km was sampled by a combination of ground-based radar (S-Pol and TOGA) precipitation profilers,rain gauges, disdrometers, as well as with aircraft (UND Citation). Satellite imagery showed that the line originated as an outflow boundary from previous convection several hundred kilometers northeast of S-pol. The squall line moved westward at approximately 5 m/s and entered the east dual Doppler lobe around 1930 UTC. The line held together in a roughly north-south orientation for several hours, eventually merging with a cell complex that had formed near the TOGA radar site around 2100 UTC. The Citation sampled new cell growth ahead of the line (2020-2130 UTC) as well as decaying convection and stratiform precipitation on the east side of the line. The Citation performed a spiral decent over the profiler pair around 2150 UTC. To date, approximately 2.5 hours of ground-based radar data (1950-2210 UTC) have been synthesized for dual-Doppler analysis.


Radar Analysis

Citation Aircraft Measurements (courtesy of Jeff Stith at NCAR ATD)

Profiler Plots (courtesy of the NOAA Aeronomy Laboratory)

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




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