010604 -- Case Summary Flight Times: 1840 - 2314 ANVIL CASE DAY No attenuation of 74C radar for this case. Case 1 Detached anvil in late decay stage. This shows precip going to the ground, but no cores. Case 2 This is very close to the radar data void and rather small so we can't really say much about it. Case 3 It is possible this anvil is from the cell studied in Case 1. It appears this anvil becomes detached and quickly decays. Case 4 At this time this is a separate cell with some lightning. It will soon be taken over by the one to the south. This anvil becomes detached at about 2003. Case 5 This cell started off a moderate size when the aircraft took off, but it grew. The >= 45 dBZ region in the 4 km level at 2009 is about 40kmx30km with maximum > 60 dBZ. There is quite a lot of lightning associated with the cell. At about 2104 - 2135 there appears to be lightning out in the anvil. There isn't a lot of motion in this system until about 2032 or 2045. The aircraft arrives early in the development of this storm. It starts off as a line of small convective cells. The northern most cells deminish while the southern most cell gets so large that it eventually becomes the only thing there. The Citation took off at 1848 and flew chaotic patterns thru the debris and poorly formed anvil until about 1900 when it moved to the 2nd case. The E field during this first case was very weak except near 1907 when the A/C flew near somewhat higher reflectivity of ~20 dBZ. Althought the A/C was in weaker reflectivity than 10 dBZ there was ~20dBZ within 5 to 10 km. This example shows the importance of looking at reflectivity not only at the A/C location, but also nearby. First case was a detached anvil between MLB and Vero Beach. Flight passes were made between 19:04 and 19:28 UTC. Weak fields. The measurements were not very continuous. CASE 2: Near 1900 a new stronger cell(s) appeared at X,Y=-1-,-75 with 54 dBZ at 7 km at 1900. The first small cell was probably present by 1845. From 1915 to 1930 it weakens but still has reflectivity of 40 to 45 dBZ at 7km. The Citation moved to this cell at 1930 making it's first pass N to S near reflectivities of 20 to 30 dBZ. E fields on this pass were 30 to 40 kV/m. The Citation made a 270 degr. loop and then proceeded East along the anvil which was moving E at 7 km, but the pass was on the southern edge so the E fields were not as large as near the cores. The measured E fields decreased with time, but the A/C did not pass through the higher reflectivities (~10-20 dBZ) so it's hard to know if strong E fields existed. During this case there is a good association between strong E field and larger reflectivity. Second case was a small single cell with anvil between Vero Beach and Fort Pierce. It decayed quickly, Efield seemed to decrease from first pass through it to last pass through it. Times where there were flights through it: 19:30 UTC to 20:05 UTC (passes at FL 270, maybe FL 230, there were strong fields between 19:32 - 19:38 UTC and became weak after that). Third case is complex of 2 3 cells along line initially west of Fort Pierce and to the South. The anvil moved to the ESE eventually reaching the range limit of the 74C radar. The Citation flew in it approximately between 20:10 UTC to approximately 22:50 UTC. Near 2000 the A/C started towards the big complex of very strong cells which had moved/propagated north from Lake Ochochobee. This complex produce the long, long-lived anvil which was presented for CASE 3.