Moisture Analyses for Specific Cases of Southwest Summer Rainfall

  1. AGU Hydrology Section
  1. E. Marshall Hansen

Published Online: 19 MAR 2013

DOI: 10.1029/SP004p0123

Precipitation Analysis for Hydrologic Modeling

Precipitation Analysis for Hydrologic Modeling

How to Cite

Marshall Hansen, E. (1975) Moisture Analyses for Specific Cases of Southwest Summer Rainfall, in Precipitation Analysis for Hydrologic Modeling (ed AGU Hydrology Section), American Geophysical Union, Washington, D. C.. doi: 10.1029/SP004p0123

Author Information

  1. Hydrometeorological Branch Office of Hydrology, National Weather Service

Publication History

  1. Published Online: 19 MAR 2013
  2. Published Print: 1 JAN 1975

ISBN Information

Print ISBN: 9781118656037

Online ISBN: 9781118668993

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Keywords:

  • Arizona basin;
  • Intermountain region;
  • Moisture analyses;
  • Potential wet-bulb temperature;
  • Southwest summer rainfall;
  • Thunderstoms

Summary

Recent literature describes renewed interest into the moisture source of the moderate to heavy precipitation of July and August in the Intermountain Southwest. This paper expands on an earlier study of extreme rainfall by examining two sequences of shower type precipitation, July 14–19, 1971 and August 17–21, 1971. Moisture in the form of 1000-mb dew points is analyzed at 6-hr intervals. Pattern changes indicate regions of increasing/ decreasing moisture. Judgments regarding moisture increases from evaporative or advective processes are considered. Two conclusions are reached: (1) intrusions of low-level moisture into the region are from the south and are independent of any upper level flow, and (2) the source of low-level moisture appears to be from the tropical Pacific in support of recent literature.