An Experiment in Additional Stratification of Conditional Climatology Summaries for Short-Term Forecast Aids.
Aerospace sciences technical note,
WEATHER WING (3RD) OFFUTT AFB NEBR
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The paper describes the results of an experiment to utilize two additional parameters in stratifying observational data for conditional climatology CC summaries. Conventional CC aids used throughout Air Weather Service stratify hourly observations by month, hour, initial ceilingvisibility category, and final ceilingvisibility category at some later time. Later versions add surface wind direction sectors as a fifth parameter. This note introduces the use of present weather and ceilingvisibility trend over the previous hour as the sixth and seventh variables in determining the conditional probabilities of five ceilingvisibility categories four hours from initial observation. A sample of the output is presented. Author