9 September 1996

MISTI over passes at 12:06 and 23:30 UT.
NOAA 12 at 11:55 UT.
GOES 8 analysis at 11:46 UT.
GOES 8 analysis at 23:46 UT.
GOES MPEG loops, 11:15-13:15 UT and 22:32-01:05 UT.

Summary

Cb's were south of EVG moving northwest on the GOES 8 image loop. A light band started crossing EVG around 12:30 UT. The HSRL indicated this band was between 10.0 and 12.0 km. A second light layer at 13.7-14.0 km appeared at 12:55 UT.

12:06 MISTI over pass

GOES 8 cloud heights at 11:46 UT were from 9.6-12.4 km with the dense cloud mass to the south reaching 14.2 km. NOAA 12 at 11:55 UT (same image as GOES) indicated heights of 14.3-16.7 km. The 16.7 km heights were at 49 degree zenith scan angles. The algorithm often produces tropopause heights at high scan angles. The first VIL scan at 12:40 UT indicate a thick precipitating layer from 9.5-12.5 km with a light thin layer around 14.5 km. Cirrus is unlikely at 16.7 km according to the lidar data.

Effective Emissivities ranged from 0.38-1.0 on GOES 8 and 0.29-0.88 on NOAA 12. An Effective Emissivity of 0.3 corresponds to a visible optical depth of 0.7 while NE=0.88 is and visible optical depth=4.2

23:30 MISTI over pass

The NOAA 12 over pass at 23:08 UT did not cover EVG because it was directly inbetween the orbits and the HIRS does not over lap coverage at this latitude. However, GOES-8 cloud heights were made at 23:46 UT. These heights are shown in km rather than the meters/100 used in the other plots.

The GOES 8 IR loop showed a variety of cloud forms crossing EVG moving southwest to northeast. The lidars were block for most of the day with dense clouds. However at 23:40 UT the VIL was able to make a near along wind scan. It indicated three levels of clouds, a low thin but dense level around 4.6-5.0 km, a middle broken layer from 7.0-9.0 km, and cirrus in several layers from 11.0-14.0 km.

GOES-8 indicated heights from 7-11 km with a 14 km height to the south.

Effective Emissivities on GOES-8 were mostly high from 0.9-1.0 indicating visible optical depths of >4.6 (NE=1.0 implies visible optical depth > 6). Some thinner Effective Emissivites were found down to 0.6 which indicate visible optical depths of 1.8.