HR: 0800h
AN: H11F-0376    [Abstracts]
TI: A Radar Climatology of Extreme Rainfall in the Front Range of the Rocky Mountains
AU: * Javier, J R
EM: jjavier@princeton.edu
AF: Princeton University, Dept of Civil and Env Eng, Princeton, NJ 08544 United States
AU: Smith, J A
EM: jsmith@princeton.edu
AF: Princeton University, Dept of Civil and Env Eng, Princeton, NJ 08544 United States
AU: England, J F
EM: jengland@do.usbr.gov
AF: Bureau of Reclamation, Bldg 67, P.O. Box 25007 Denver Federal Center, Denver, CO 80225 United States
AU: Baeck, M
EM: mlbaeck@princeton.edu
AF: Princeton University, Dept of Civil and Env Eng, Princeton, NJ 08544 United States
AB: Analyses of the spatial and temporal distribution of extreme rainfall in the Arkansas River basin above Pueblo, Colorado are based on analyses of volume scan radar reflectivity observations from the Pueblo and Denver WSR-88D radars for the period 1995 - 2004. Climatological analyses of extreme rainfall are carried out both from an Eulerian perspective, in which the time-varying distribution of rainfall at fixed locations is examined, and a Lagrangian perspective, in which distributional aspects of rainfall are based on storm tracking algorithms. Of particular interest is the spatial heterogeneity of extreme rainfall in the complex terrain of the upper Arkansas River basin. Lagrangian analyses are used to characterize the spatially varying distribution of storm initiation, storm motion and storm structure. Analyses are motivated by problems of dam safety in which distributional properties of extreme rainfall are of most interest. Climatological analyses of extreme rainfall in the upper Arkansas River basin are examined relative to the spatial and temporal properties of two extreme rain events that occurred in June 1921 and June 1964. Radar climatology indicates a lack of spatial coherence in extreme events over the basin, with the upper basin rainfall climatology exhibiting pronounced contrasts with that of the lower basin.
DE: 1854 Precipitation (3354)
SC: Hydrology [H]
MN: 2004 AGU Fall Meeting