Computations with the RAND Cloud Model for the HIPLEX Workshop, June 1975.

Francis W. Murray

Expert InsightsPublished 1975

Results of two computer runs of the RAND cloud model--a follow-up to the modeling workshop of the High Plains Cooperative Experiment sponsored by the Bureau of Reclamation's Division of Atmospheric Water Management to investigate the feasibility of augmenting rainfall. The current version of the RAND model includes nine microphysical processes: (1) condensation and evaporation of suspended droplets, (2) autoconversion, (3) accretion, (4) evaporation of precipitating drops, (5) heterogeneous nucleation, (6) homogeneous nucleation, (7) ice particle growth, (8) sublimation, and (9) melting. The mass of water substance is carefully conserved. Simulations were compared with observations for August 10 and 17, 1974. Computed values of cloud-top height, hail formation, and other properties agreed reasonably well with observations, but total computed rainfall was probably somewhat large. A general problem in atmospheric modeling on the cumulus scale is lack of adequate observational data. 37 pp.

Document Details

  • Copyright: RAND Corporation
  • Availability: Web Only
  • Year: 1975
  • Pages: 37
  • Document Number: P-5473

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Murray, Francis W., Computations with the RAND Cloud Model for the HIPLEX Workshop, June 1975. Santa Monica, CA: RAND Corporation, 1975. https://www.rand.org/pubs/papers/P5473.html.
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