5 September 1996

MISTI over pass at 23:14 UT
NOAA 12 over pass at 00:36 UT
GOES 8 analysis at 00:46 UT (same image as NOAA)
(GOES 8 and NOAA 12 Effective Emissivities)

MPEG IR movie of 5 September 1996 (22:30-00:15 UTC).
MPEG Visible channel movie of 5 September 1996.

HSRL and VIL lidars
VIL optical depth image.

Cloud Summary

An optically thin cloud passed north of the lidars. This cloud moved from east to west. It can not be seen on the visible image loop but can be faintly seen on the IR loop. The visible loop shows primarily low clouds moving in the opposite direct (towards the east) where as the high cloud moved directly west. The sounding indicated westerly winds up to 8 km in which most of the clouds on the image loops were moving (towards the east). Wind directions where highly variable. The easterly winds in which the cirrus were embedded were prevalant above 14 km. The lidars sampled only the southern edge of this cloud. The main part of this cloud was 30-60 km north of the lidar's location.

GOES-8 Sounder cloud heights range from 0.8-14.9 km. The 0.8-1.5 km clouds being the boundary layer. Clouds above the boundary layer were reported from 4.2-14.9 km. This differs from the lidar quick look images (VIL and HSRL) which show a flat uniform layer from 15-16 km. NOAA-12 cloud heights ranged from 2.2-16.0 km. The 2.2-2.6 km clouds being the boundary layer.

The Ci were reported at two points by NOAA-12 at 14.4 and 16.0 km altitudes. The spacings between the NOAA-12 HIRS observations were large because this was near the outter edge of the HIRS scan (56 degree zenith angle). These reports were about 60 km west of Everglades City.

Cloud optical depths from the satellites ranged from 0.2-0.6 (visible). The GOES-8 Sounder Effective Emissivities ranged from 0.10-0.27 while the two NOAA-12 Effective Emissivities were 0.11 and 0.14. An Effective Emissivity of 0.1 equates to a visible optical depth of 0.2 and a EE=0.27 equates to a visible optical depth=0.6.

Lidar optical depths averaged about 0.17 (visible). They were highly variable as shown by the quantitative VIL optical depth image. Cloud base and top heights also have been shown in areal displays of the VIL. More displays can be found on the Lidar VIL Home Page