10 September 1996

MISTI over pass at 11:26 UT
NOAA 14 at 07:14 and 18:32 UT.
NOAA 12 at 13:14 and 00:27 UT.

GOES 8 analysis times are:
  • 7:46 UTC
  • 8:46 UTC
  • 9:46 UTC
  • 10:46 UTC
  • 11:46 UTC
  • 12:46 UTC
  • 13:46 UTC
  • 14:46 UTC
  • NOAA 12 cloud heights and Effective Emissivity.

    MPEG IR movie of 10 September 1996 (7:45-13:32 UTC).

    MPEG Visible channel movie of 10 September 1996 (11:32-13:32 UTC).

    Weather and Clouds.

    There were several large Cb's to the south and southeast of Everglades City. Anvils were moving northeast over the lidars. The lidars experienced rain at 11:10 UT. Later, the cloud base rose to about 4 km with a few boundary layer Cu below.

    Cloud heights of the anvils were 10-14 km according to GOES-8 at 11:46 UT. Right over Everglades City they were 11-12 km. NOAA 12 at 13:14 UT indicated higher cloud heights of 14.3-16.7 km because these were the end of the HIRS scan and at the maximum scan angle of 59 degress zenith. The tendency of the HIRS is to over estimate the cloud highs at the end of the scan so my best guess of cloud height is 12 km from GOES 8.

    Everglades City was inbetween the two NOAA 12 orbits so the HIRS did not scan directly over the lidars. The closest HIRS data point to EVG was 47 km to the northwest.

    Effective Emissivities indicated very dense clouds on the 11:46 UT GOES 8 analysis. Effective Emissivities were 0.9-1.0 indicating visible optical depths > 6.0.

    NOAA 12 had lower Effective Emissivities of 0.6-0.8 implying optical depths of 1.6-3.4. However, these data points were taken 1.75 hours after the MISTI over pass and farther down wind from the Cb's than the lidar's location. The GOES 8 analysis at 13:46 UT indicates optically thinner clouds with Effective Emissivities of 0.4-1.0 in the area where the HIRS data were taken. For the MISTI over pass, use the GOES 8 11:46 UT data.