1. Observations of Early Ice Formation during the ICE in Clouds Experiment: ICE-T Andrew Heymsfield, NCAR, Boulder CO Paul Field, UK Met Office, Exeter, UK Sonia Lasher-Trapp, Purdue Univ., West Lafayette, IN Dave Rogers and Jeff Stith, NCAR, Boulder, CO Zhien Wang, Dave Leon, Jeff French, and Sam Haimov, University of Wyoming, Laramie, WY

2. RF05 12 July 2011

3. RF05 12 July 2011

4. 184942

5. 18:44:34 7.7C Fast 2DC 3VCPI

6. 185023 -3.4C

7. 19:22:30 -5.7C

8. 19:30:21 -7C

9. 185027:16, break, 185718 T=-2C T=-6C

15. Summary and Conclusions Observations in developing chimney clouds --- Updraft velocities ranging from 5-14 m/s ---Temperatures from +7 to -7C Active ice formation process at T>-5 to -7C~.1/L For ICE-T clouds, secondary ice particles are prevalent near -5C with low LWCs and vertical velocities, undetectable with higher LWCs and w’s. ICE-D (“dust) in 2015 from Cape Verde, AF, will target the effects of dust on cloud processes.