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Moisture convergence using satellite-derived wind fields - A severe local storm case studyFive-minute interval 1-km resolution SMS visible channel data were used to derive low-level wind fields by tracking small cumulus clouds on NASA's Atmospheric and Oceanographic Information Processing System. The satellite-derived wind fields were combined with surface mixing ratios to derive horizontal moisture convergence in the prestorm environment of April 24, 1975. Storms began developing in an area extending from southwest Oklahoma to eastern Tennessee 2 h subsequent to the time of the derived fields. The maximum moisture convergence was computed to be 0.0022 g/kg per sec and areas of low-level convergence of moisture were in general indicative of regions of severe storm genesis. The resultant moisture convergence fields derived from two wind sets 20 min apart were spatially consistent and reflected the mesoscale forcing of ensuing storm development. Results are discussed with regard to possible limitations in quantifying the relationship between low-level flow and between low-level flow and satellite-derived cumulus motion in an antecedent storm environment.
Document ID
19800066596
Document Type
Reprint (Version printed in journal)
Authors
Negri, A. J. (NASA Goddard Space Flight Center Laboratory for Atmospheric Sciences, Greenbelt, Md.; Colorado State University, Fort Collins, Colo., United States)
Vonder Haar, T. H. (Colorado State University Fort Collins, Colo., United States)
Date Acquired
August 10, 2013
Publication Date
August 1, 1980
Publication Information
Publication: Monthly Weather Review
Volume: 108
Subject Category
METEOROLOGY AND CLIMATOLOGY
Funding Number(s)
CONTRACT_GRANT: NSF ATM-76-21307
CONTRACT_GRANT: NSG-5011
Distribution Limits
Public
Copyright
Other