posted
| Date of Mission: | 26 August, 1998 |
| Daily Mission Scientist: | Ed Zipser |
| Deputy Daily Mission Scientist: | Gerry Heymsfield |
| DC-8 Scientist: | Ed Zipser |
| S-POL Scientist: | Gerry Heymsfield |
| Project Scientist: | Robbie Hood |
| UND Citation II Scientist: | Jeff Stith |
| Water Vapor Scientist: | Harvey Melfi |
| Nowcasters: | Richard Wohlman |
| ER2 Tail Number: | NASA 806 |
| Sortie: | 98-111 |
| Pilot: | Jan Nystrom |
| Take Off: | 1100 UTC (98/08/26) |
| Landing: | 1816 UTC (98/08/26) |
| Duration: | 7.27 hrs |
| DC8 Tail Number: | NASA 817 |
| Sortie: | 980411 |
| Pilot: | Ed Lewis Dick Ewens |
| Mission Manager: | Chris Miller |
| Navigator: | Russ Padula/Trout |
| Take Off: | 1103 UTC (98/08/26) |
| Landing: | 1826 UTC (98/08/26) |
| Duration: | 7.38 hrs |
- Obtain data from the ER-2 and DC-8 on clouds and precipitation over and within Bonnie as possible at/near the times of TRMM overpasses at 1135, 1313, and 1449 UTC.
- As Bonnie approached landfall near Cape Fear NC, execute coordinated passes through the storm with the ER-2, DC-8, and NOAA 42, all within a radius of 100 nm.
- Obtain LASE and MACAWS data in the clear-air inflow region southeast of Bonnie.
All objectives were met. The storm continued to exhibit a huge eye, with the eyewall almost closed, circular, and about 100 nm in diameter. The north wall had heavier rainfall rates, but at no time was any turbulence more than light encountered at DC-8 level. Indeed, after the first figure-four was completed at 35K' we descended to 30K' for the second figure-four. The wind pattern was more symmetric than on the two previous flights, with mainly cyclonic flow at all radii out to >100 nm, and wind maxima quite far away from the center, in the 50-60 knnot range. The clear air inflow leg on the SE side was indeed mostly clear above the low broken clouds in the lowest 1000-1500 m. On exit, we modified the return leg to come through clear air southwest of the storm before returning to Patrick AFB.
| UND Tail Number: | UND N77ND |
| Pilot: | Kent Streibel |
| Take Off: | 2200 UTC (98/08/26) |
| Landing: | 2318 UTC (98/08/26) |
| Duration: | 1.30 hrs |
We sampled a samll convective rain shower SW of S-Pol, too far for ideal radar coverage. The purpose of the flight was to flight test the new High Volume Particle Sampler (HVPS) and to obtain data for comparison wiht S-Pol, if possible.
The probe did not respond properly during flight, and the signals from it degenerated during the flight, so we cut the flight short and returned to b base to troubleshoot the probe. The problem was traced to a loose connector which was affected by vibrations during the flight. It has been repared with a better connector and we will try and repeat this mission.
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