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The Mt. St. Helens Ash Cloud western Montana , an d western Wyoming has a satellite-derived brightnes s temperature of between —58 an d —54°C. Com- Michael Matson and Scott J. Staggs, Land Sciences pariso n with radiosonde data taken at Spokane, Wash., at Branch, National Earth Satellite Service/NO A A, Wash- 5:00 p m PD T shows temperature s in this rang e at heights be- ington, D. C. 20233 tween 10.5 and 11.0 km. Th e specific display of color radiometric temperature range s is: light green, 41 t o 24°C; green, 23 t o 13°C; blue, 12 Th e cover picture is the computer-enhanced GOES satellite t o 6°C; yellow, 5 t o -6°C ; orange, - 7 to -30°C ; dar k brown, image of the 18 May 1980 Mt. St. Helens ash cloud, taken at -3 1 to —49°C; an d black, -5 0 to -60°C . Th e dar k area to the 4:45 p m Pacific Daylight Time (PDT). The thermal infrared nort h of the ash cloud is high clouds with temperatures sim- senso r used to obtain this image operates in the 10.5 jum- ilar to those of the ash
Bulletin of the American Meteorological Society – American Meteorological Society
Published: Oct 1, 1981
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