Kinematic and Microphysical Statistics for 990223

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


This page contains volume average statistics of selected fields (vertical air motion, vertical mass flux, reflectivity, liquid water content, precipitation ice content, and near surface precipitation) for the 990223 event between 2002-2130 UTC. The 2002-2130 UTC period was chosen since the system was captured in the east dual Doppler lobe at this time. Prior to 2000 UTC, the vast majority of the system was positioned outside the area of dual-Doppler sampling. After 2130 UTC, the system was largely decaying. The dual Doppler sampling period was probably most representative of the mature to disspitating stage of this event.

Dual-Doppler analyses were performed at 10 minute intervals over a 14,400 km^2 grid domain centered on the location of the SPOL radar (X_min=-45, X_max=75, Y_min=0, Y_max=120) using 1 km horizontal and 0.5 km vertical grid resolution. Microphysical retrievals were calculated using SPOL data over the same 2002-2130 UTC time period with a grid (centered on SPOL) extending over a 40,000 km^2 domain (X_min=Y_min=-100, X_max=Y_max=100) with 2 km horizontal and 0.5 km vertical resolution. Although the grid domain specified for the microphysical retrievals is significantly larger than the dual-Doppler domain, they are actually much closer in size since SPOL was conducting sector scans covering the dual-Doppler lobe only during this time period. Thus, much of the domain in the microphysical retrievals (i.e., outside the dual-Doppler lobe) contains no data.

The methodology used to calculate kinematic and microphysical fields is similar to the procedures outlined in Cifelli et al. 2001.

CFAD's of vertical air motion, reflectivity, and vertical mass flux (mean profiles overlaid where at least 1% of grid points at a given grid level are "good")

CFAD's of liquid, precipitation ice water content, and mass weighted mean diameter (CFAD's and mean profiles overlaid where at least 1% of grid points at a given grid level are "good")

Mixed phase statistics

Rainfall statistics

Mean profiles of horizontal wind and divergence (mean profiles shown where at least 1% of grid points at a given grid level are "good")

Convective fraction




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