000604 -- Case Summary 
Flight Times:  2006 - 2340

ANVIL CASE DAY

No attenuation of 74C radar for this case.

Add 2 hours UND-system-time! The SEA data was recorded 2 hours off
and needed to be corrected.


Citation flight from 2013 to 2339 with the main area of investigation
west of Vero Beach.

The first CG lightning from the storm complex was at ~1950 and the last
was at ~2153 with the main period of CG activity occuring from 2100 to
2140 centered near (-30,-70). There were no LDAR data from this day.

It would be interesting to examine the E field structure at the 
time of the spiral ascent and after, but this case does not give 
opportunity to look at E field decay.

The aircraft flew descending vertical spiral and racetrack patterns
through anvils blowing off to the east from a complex of thunderstorms
between 50 and 100 Km south of Patrick AFB from 21 to 23Z. These storms
formed in a well-defined tongue of cold air aloft that included a local
200 mb cyclonic circulation in the vicinity of Lake Okeechobee. The
anvils generally exhibited high fields throughout the period, but the
aircraft penetrated some regions of highly variable or minimal fields
possibly associated with the presence of charge pockets or screening
layers. Several penetrations of cloud boundaries were observed that
might be useful in the study of the decay of fields with distance from
cloud edge.

The aircraft frequently flew either at the edge of the anvil or close to
convection.

This case was not presented at a teleconference.