policy statement

policy statement Planned and Inadvertent Weather Modification (Adopted by the AMS Council 2 October 1998) This statement is concerned with the scientific understood at this time and have not been documented status of planned and inadvertent weather modifica- with observations nor simulated in numerical model- tion on local and regional scales. The Society's policy ing experiments. on global climate change is separate and has previ- In recent years, the seeding of warm and cold con- ously been presented {Bull. Amer. Meteor. Soc., 72, vective clouds with hygroscopic chemical particles to 57). augment rainfall has received renewed attention through model simulations and field experiments. A recent randomized experiment has reported statistical 1 . Status of planned weather evidence of a rainfall increase that is supported by numerical modeling experiments. Nevertheless, mea- modification surements of key steps in the chain of physical events associated with hygroscopic particle seeding are a. Fog and stratus removal needed to confirm the seeding hypothesis and the Operations that dissipate supercooled fog and low range of effectiveness of these techniques in increas- stratus (clouds containing water droplets at subfreez- ing precipitation. Evidence that such seeding can in- ing temperatures) by seeding with ice-forming agents crease rainfall over economically http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Bulletin of the American Meteorological Society American Meteorological Society

policy statement

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Publisher
American Meteorological Society
Copyright
Copyright © American Meteorological Society
ISSN
1520-0477
D.O.I.
10.1175/1520-0477-79.12.2771
Publisher site
See Article on Publisher Site

Abstract

Planned and Inadvertent Weather Modification (Adopted by the AMS Council 2 October 1998) This statement is concerned with the scientific understood at this time and have not been documented status of planned and inadvertent weather modifica- with observations nor simulated in numerical model- tion on local and regional scales. The Society's policy ing experiments. on global climate change is separate and has previ- In recent years, the seeding of warm and cold con- ously been presented {Bull. Amer. Meteor. Soc., 72, vective clouds with hygroscopic chemical particles to 57). augment rainfall has received renewed attention through model simulations and field experiments. A recent randomized experiment has reported statistical 1 . Status of planned weather evidence of a rainfall increase that is supported by numerical modeling experiments. Nevertheless, mea- modification surements of key steps in the chain of physical events associated with hygroscopic particle seeding are a. Fog and stratus removal needed to confirm the seeding hypothesis and the Operations that dissipate supercooled fog and low range of effectiveness of these techniques in increas- stratus (clouds containing water droplets at subfreez- ing precipitation. Evidence that such seeding can in- ing temperatures) by seeding with ice-forming agents crease rainfall over economically

Journal

Bulletin of the American Meteorological SocietyAmerican Meteorological Society

Published: Dec 1, 1998

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