21 September 1996, 96265

Lidar coverage from 19:00-00:10 UT
GOES 8 19:30
NOAA 14 at 19:54 UT Cloud Heights and Effective Emissivities.
NOAA 12 at 23:46 UT Cloud Heights and Effective Emissivities.

Other GOES 8 analysis times.
  • 18:46 UTC
  • 19:46 UTC Also includes the NOAA 14 cloud heights.
  • 20:46 UTC
  • 21:46 UTC
  • 22:46 UTC
  • 23:46 UTC Also includes the NOAA 12 cloud heights.

    MPEG IR movie of 21 September 1996.

    MPEG Visible channel movie of 21 September 1996.

    NOAA 14 19:54 pass.

    HSRL shows no Ci, however a diffuse layer from 13.0-14.0 km appeared later around 20:45 UT. A thin lower layer from 5.0-5.3 km was present at 19:54. VIL shows very thin layers between 13-14 km at 19:20 and 19:30 UT but nothing at 19:50 UT. A very thin cloud was found at 20:00 UT at 13 km altitude, 2-3 km to the southeast.

    NOAA 14 viewed EVG at a high angle of 59.6 degrees. The closest pixel to EVG reported only 1.8 km while the next pixel to the south reported a 14.9 km cloud.

    GOES 8 had two Ci reports near EVG, 11.0 and 9.7 km. There was some definite cloud to the south where GOES 8 had reports from 9.7-14.2 km with a few 4.2 km reports. The 14.2 km was probably the thin 5.0-5.3 km cloud seen on both lidars.

    The Effective Emissivities for GOES 8 on these mid level clouds was 19 and 27% indicating visible optical depths of 0.4 to 0.6.

    NOAA 12 23:46 UT pass.

    Both the VIL and HSRL reported a 15.0-15.3 km thin cloud. Unfortunately a fairly dense cloud past to the south of EVG in an eastward direction and the VIL missed it. This cloud is evident on the GOES 8 image. The VIL was scanning directly west at this time, around 300 degrees azmuith so we have no information on the cloud to the south.

    NOAA 12 didn't find any Ci. It had pixels on either side of EVG about 12-16 km away and reported only the 1.5 km heights below. The 12.5 km height was the large cloud 40 km to the south. Scan angles were near nadir on this pass.

    GOES 8 reported heights of 9.7-12.4 km for the same cloud. It also had a 11.0 km report 5 km southwest of EVG with nothing on the other sides of EVG. The optical depth of the 15 km cloud seen on the lidar must have been two small for detection by either satellite.