Comparison of the Naval Operational Global Atmospheric Prediction System cloud analyses and forecasts with the Air Force Real Time nephanalyses cloud model
Publisher: Naval Postgraduate School; Available from National Technical Information Service
Published: 1998
Place of publication: Monterey, Calif; Springfield, Va
Language: eng
Number of pages: 93
Description: This thesis compares RTNEPH and NOGAPS analyses for high, middle, and low clouds during January 1998      and October 1997. We believe that the RTNEPH analyses are reasonably accurate except for in the polar      regions and the low clouds. NOGAPS forecasts at 12, 24, 36, and 48h are compared with the appropriate      RTNEPH analyses. The difference fields averaged over a month show a rapid increase in the first 12 h over the      forecast, followed by a slow growth to 48 h. The rapid increase is caused by model adjustment. The RTNEPH      and NO GAPS (including forecasts) are separated into nine categories: clear, 0-20, 20-40, 40-60, 60-80, and      80-100. When the clear and 0-20% categories are combined the RTNEPH and NOGAPS analyses compare      well for high and middle clouds. However the RTNEPH and NOGAPS analyses are distributed differently for      the other categories, and the RTNEPH has many more occurrances for the cloudiest category (80-100%). For      low clouds the RTNEPH and the NOGAPS are quite different, since the RTNEPH has difficulty analyzing      clouds at night The NOGAPS and the RTNEPH (except for low clouds) generally agree on the clear areas.      However, it appears that NOGAPS underestimates the number of mostly cloudy cases and the distribution of      categories is different.
Notes: Thesis advisor(s): Roger T. Williams.

"June 1998."

Thesis (M.S. in Meteorology) Naval Postgraduate School, June 1998.

Includes bibliographical references (p. 91).

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US Air Force (USAF) author.

dk/dk cc:9116 09/30/98.