| JNWP operational models, August 1958 to advent of IBM 7090 (1960) - :10653 | NOAA Historical Materials
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JNWP operational models, August 1958 to advent of IBM 7090 (1960)
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    United States, Weather Bureau,
  • Description:
    "Routine forecasts were initiated at JNWP on 6 May 1955 using a 3-level model (see Charney (1.1) ) covering an area somewhat larger than the United States. Due to the importance of boundary effects, efforts were made to extend the forecast area as much as possible within the limitations of the IBM 701 computer. The first step in this direction was the introduction of an experimental once daily barotropic forecast (see Charney and Phillips (1.2)) on September 29, 1955, covering approximately the area north of latitude 20 in the western hemisphere and north of latitude 50 in the eastern hemisphere. This was followed by introduction of the 2-level thermo- tropic model (see Thompson and Gates (1. 3)) on 3 April 1956 covering an area intermediate between those of the 3-level and barotropic models. The S results were so encouraging that on 2 July 1956 barotropic forecasts were increased to twice daily and the 3-level model was dropped completely in favor of the 2-level thermotropic model"--Page 1, paragraph 1.

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