010525 -- Case Summary Flight Times: 1829 - 2213 ANVIL CASE DAY No attenuation of 74C radar for this case. 010525 1 attached anvil with mid-level 20dBZ 2 active convection 3 anvil debris 4 small attached anvil to debris A/C position is unavailable until ~1857, due to problems with the APPLANIX position system. Air traffic was very heavy due to Memorial Day weekend, so operating was difficult. There were storms with anvils over KSC. We were able to make passes over KSC, but were not allowed to loiter there. So we were able to take some "snapshots" but not follow development and decay. On the way home, the plane made some passes through an anvil near PAFB. The Plane landed at 1810. Case 1: The was a small anvil on the northern edge of the line. Case 2: If you go back to 1834 you will see that there was convection in the area, thus it was a debris cloud. Case 3: This part of the study was at the opposite end to the development of the convection. Case 4: This might be the same debris as case 2. Case 5: Ths is debris from the convective part of case 1. The aircraft might have been flying through some anvil after 2014. Case 6: Aircraft was flying close to convection. The various "cases" for this flight were all associated with the same line of convectin. It is susspected that each had a separate core. Or, as in the case of 1 and 5 or 2 and 4 the aircraft sampled the same "cell system" at different times. The velocity was the velocity of the system which didn't really go anywhere. The cells moved very slowly, while the anvils developed and blew off to the NE. There was some motion within the line, but the line didn't really move. It was difficult to distinguish between storm motion and the growth and development of the anvils that formed. Two separate cases were observed during this flight. The first (18:50 - 20:20 UTC) sampled an attached anvil with a quickly decaying core that subsequently became a debris cloud. Most of this portion of the flight is over the water. During the interval 19:29:04 - 19:37:35 the aircraft left the anvil/debris cloud and sampled the west side of a convective cell over land. The region sampled was more like a trailing stratiform region, but was very localized. The A/C was in close proximity to active light and elevated fields were not observed. The 2DC was not working during this time. The A/C then returned to the region it was sampling prior to the detour. Elevated fields were observed in both cases, and there were several intervals in which the E-fields were significant and a cloud was not detected by the Patrick radar. During these events, the microphysical instruments show the presence of cloud along the flight track; therefore, we presume these events are within radar voids. case 1: ~1850 to ~ 2020; anvil with initially strong fields decaying to weak fields; study has gaps and hampered by ATC problems, first one was active cell decaying at Vero Beach moving north-east, First case is an attached anvil (first to an active core - then decaying and getting detached later then maybe connected to new developing cells again) out over the ocean just North of Vero Beach. The Citation made a few East-West passes and North-South passes through the anvil between approximately 18:50 UTC and 20:30 UTC. There were strong electric fields between 18:50 UTC and 19:01 UTC - the Citation was doing a South-North pass close to the core. After that new cells were developing just North of the previous cell. The Citation was sometimes also flying through their anvil. All cells seemed to be in a stage of decay when the Citation was leaving them at around 20:30 UTC. case 2. ~2035 to ~2200 complex anvil from 2 or 3 cells over and E of KSC and later over PAFB; possibility of comparing E at sfc with aloft for brief periods; second case was over KSC - detached anvil The second case was an attached anvil from several active (and weakening) cores. This segment of the flight was over and near the KSC area. Second case was above KSC from 20:39 UTC to end of flight. Detached or attached anvil(s). Active cores around it. First passes showed moderate fields growing weaker on later passes. The second case (20:20 - 22:00 UTC) was an attached anvil from several active (and weakening) cores. This segment of the flight was over and near the KSC area. During the interval of 20:49 - 20:59 there is no electric field data. There was lightning activity in the vicinity of the A/C during this case. There may be several examples of lightning field changes aloft over or near the KSC network, and one interval in particular is from 21:08:30 - 21:10:30. The A/C fields are elevated and a lightning field change occurs at 20:09:20; at this time the A/C was over water east of KSC. Two surface field mills (site 13 and 28) from the KSC network showed field changes of approximately 20 - 40 V/m. In a later portion of this flight, the A/C was in a region of radar void. Elevated fields were observed between 21:46:27 - 21:47:10 and 21:49:40 - 21:50:10 without clouds as detected by radar. Efield data of Citation missing between 20:54 and 21:00 UTC.