Another large flock is seen flying from Water Conservation Area 3 (WCA-3) west of Fort Lauderdale. There is suggestion of an expanding ring here as well, but the bulk of this flock is progressing to the southwest, ahead of the advancing line of thunderstorms. (A very large ring of echoes around WCA-3 appeared on March 31, and may be viewed here).
It would be interesting to hear from people on the ground near either area as to whether these massive dawn flights represent wading birds, blackbirds, or a combination. (”My Son The Meterologist,” with due scientific caution, would include the possibility of clouds of insects.)
Note that as the ring begins to form, as shown in the clip of the earliest frame, that the biomass in both areas is high enough to produce a green echo. I sent this clip to David LaPuma (BADBIRDZ), for his information .
Detailed clip of Miami Radar loop on April 13, 2008 (6:49 AM EDT frame):
Miami Radar loop on April 13, 23008, 6:49 to 7:30 AM, EDT: