The choices for a SEPTEMBER WINNER were very limited with only one storm
recommended for the month. It occurred on the 21st over southeastern Washington
county at about 745pm. This rather isolated storm peaked with VILs only of 31
kg/m*m due to the elevated 50-60 dBz core reaching just 32,000 feet. A weak
shear environment also prevented this storm from being sustained more than
about 10 to 20 minutes(what we term a pulse-severe storm). These type of storms
result from High CAPE/Low Shear environments which are most common during the
warm season. In this case the CAPE was 3000-3500 J/kg. A weak circulation was
noted in the Storm Relative Velocity images and by the Cell Table Analysis.
Since the storm remained over rural areas, no severe weather reports were
relayed to our office.
Reflectivity Vertical Cross Section
A 4-Panel View of...Storm Relative Velocity in the
lowest 4 elevation sweeps(radar southeast of Storm -green is motion toward
radar and red is motion away)
weather.gov 
