IFEX daily log
Thursday, August 18, 2005
Yesterday was the coordination test flight with N43RF and the NRL P-3. Both
aircraft conducted flight-level intercomparisons at 8000 and 12,000 ft. and then they each
dropped a GPS sonde over a buoy just offshore (buoy 42013). Drops from both aircraft
worked well. No organized convection was occurring over water, so the aircraft targeted
convection occurring north of Tampa over land. A north-south line of convection was
flown with the NRL P-3 trailing N43RF. Lower-fuselage imagery was transmitted from
N43RF nearly continuously (with a few breaks in transmission) and received on the
ground. Two images, with NRL flight track overlain, were processed on the ground and
relayed back to the NRL P-3, demonstrating the capability of performing this
transmission in near real-time. This was a critical test for RAINEX. There were a few
glitches that will need to be tested on a possible test flight tomorrow between N42RF and
the NRL P-3. There was also a test transmission of tail Doppler-radar analyses off the
aircraft to the AOML ftp site that was successfully completed, and a test was performed
of the ability to download satellite imagery from HRDÕs RAMSDIS satellite server to the
workstation on the aircraft. That RAMSDIS test will require some further work, but it is
anticipated that it will be functioning soon.
Today is a down day. N43RF is ready to fly again, and N42RF is continuing to
undergo IWRAP installation and testing. It is anticipated that N42RF will be available
for a test flight tomorrow, possibly at 18 UTC. The NRL P-3 may or may not accompany
N42RF. The primary purpose for the test flight for N42RF is to test the IWRAP
instrument for Ocean Winds, but N42RF can transmit the LF data during the flight
regardless.
In the tropics the environments of the western Atlantic and northern Caribbean
continues to be dominated by a strong anticyclone in the lower levels (Fig. 6). This has
suppressed convection over the Florida peninsula and prevented development along its
eastern periphery due to vertical shear around the eastern edge of the anticyclone. The
remnants of T.D.#10 remain disorganized. There is evidence that convection is
continuing to develop within the circulation (Fig. 7), but the low-level circulation appears
elongated from the northwest to the southeast and the convection is not organized. The
vertical shear is fairly weak at the moment (about 10 kt; Fig. 8), but if the system
continues to move toward the west-northwest it may encounter higher shear southeast of
the Bahamas as it approaches the eastern edge of the anticyclone. Elsewhere there is
convection in the southern and southwestern Caribbean (Fig. 9). This convection appears
largely disorganized, though there may be some suggestion of a cyclonic turning in the
southwestern system. Any development of this system would likely lead to a motion
toward the north and then the northwest over the Yucatan peninsula.
There are no imminent targets at this time, though there is consideration of flying
another test flight into T.D.#10, especially if it develops into a tropical storm near the
Bahamas. Such a flight would not likely be until Sunday, however.
Rob Rogers
HRD Field Program director
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