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Accession Number ADA580233
Title Atmospheric Rivers and Their Role in Extreme Precipitation in the Midwest U.S.
Publication Date Mar 2013
Media Count 113p
Personal Author S. L. Hedstrom
Abstract Two case studies are presented of atmospheric rivers (ARs) that produced heavy precipitation in the Midwest U.S. during March 2008 and October 2009. A third case study demonstrating an AR with normal precipitation in the Midwest also is included for comparison. The analyses used the Climate Forecast System Reanalysis (CFSR) data sets for identification of ARs and analysis. The study documents several key ingredients that contribute to differentiating between events of extreme precipitation and normal precipitation. The primary findings of this study are as follows: (1) the induced flow due to the low- level/surface temperature anomaly plays an important role in transporting moisture from the Caribbean northward to the Midwest; (2) the induced wind field from a strong upper-level potential vorticity (PV) anomaly increases moisture flux from the Gulf and decreases static stability, which favors convective precipitation, and (3) heavy precipitation events are preceded approximately 9 hours by an increasing, positive moisture flux occurring across the northern Gulf Coast.
Keywords Atmospheric precipitation
Atmospheric rivers
Caribbean sea
Case studies
Climate forecast system reanalysis
Heavy precipitation
Marine meteorology
Mesoscale convective systems
Mexico gulf
Midwest(United states)
Military facilities
Moisture budget
Moisture flux
Ocean surface
Potential vorticity anomalies
Surface temperature
Weather forecasting
West coast(United states)
Wind fields

Source Agency Non Paid ADAS
NTIS Subject Category 55C - Meteorological Data Collection, Analysis, & Weather Forecast
47C - Physical & Chemical Oceanography
74E - Logistics, Military Facilities, & Supplies
48 - Natural Resources & Earth Sciences
Corporate Author Naval Postgraduate School, Monterey, CA. Dept. of Meteorology.
Document Type Thesis
Title Note Master's thesis.
NTIS Issue Number 1325
Contract Number N/A

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