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Titre du document / Document title

The Contribution of Eastern North Pacific Tropical Cyclones to the Rainfall Climatology of the Southwest United States

Auteur(s) / Author(s)

CORBOSIERO Kristen L. (1) ; DICKINSON Michael J. (2) ; BOSART Lance F. (3) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, Los Angeles, California, ETATS-UNIS
(2) Weather Predict Consulting, Inc., Narragansett, Rhode Island, ETATS-UNIS
(3) Department of Earth and Atmospheric Sciences, University at Albany, State University of New York, Albany, New York, ETATS-UNIS

Résumé / Abstract

Forty-six years of summer rainfall and tropical cyclone data are used to explore the role that eastern North Pacific tropical cyclones (TCs) play in the rainfall climatology of the summer monsoon over the southwestern United States. Thirty-five TCs and their remnants were found to bring significant rainfall to the region, representing less than 10% of the total number of TCs that formed within the basin. The month of September was the most common time for TC rainfall to occur in the monsoon region as midlatitude troughs become more likely to penetrate far enough south to interact with the TCs and steer them toward the north and east. On average, the contribution of TCs to the warm-season precipitation increased from east to west, accounting for less than 5% of the rainfall in New Mexico and increasing to more than 20% in southern California and northern Baja California, with individual storms accounting for as much as 95% of the summer rainfall. The distribution of rainfall for TC events over the southwest United States reveals three main categories: 1) a direct northward track from the eastern Pacific into southern California and Nevada, 2) a distinct swath northeastward from southwestern Arizona through northwestern New Mexico and into southwestern Colorado, and 3) a broad area of precipitation over the southwest United States with embedded maxima tied to terrain features. Differences in these track types relate to the phasing between, and scales of, the trough and TC, with the California track being more likely with large cutoff cyclones situated off the west coast, the southwest-northeast track being most likely with mobile midlatitude troughs moving across the inter-mountain west, and the broad precipitation category generally exhibiting no direct interaction with midlatitude features.

Revue / Journal Title

Monthly weather review    ISSN  0027-0644   CODEN MWREAB 

Source / Source

2009, vol. 137, no8, pp. 2415-2435 [21 page(s) (article)] (1 p.3/4)

Langue / Language

Anglais

Editeur / Publisher

American Meteorological Society, Boston, MA, ETATS-UNIS  (1872) (Revue)

Mots-clés anglais / English Keywords

Mexico

;

California

;

Pacific Ocean

;

North Pacific

;

North America

;

United States

;

Nevada

;

East Pacific

;

Baja California

;

Northern California

;

Southern California

;

New Mexico

;

Southwestern U.S.

;

Northeast Pacific

;

mountains

;

Colorado

;

Arizona

;

trajectory

;

storms

;

atmospheric precipitation

;

Mid latitude

;

Summer monsoon

;

Summer

;

Climatology

;

rainfall

;

Tropical cyclone

;

Mots-clés français / French Keywords

Mexique

;

Californie

;

Océan Pacifique

;

Océan Pacifique Nord

;

Amérique du Nord

;

Etats Unis

;

Nevada

;

Océan Pacifique Est

;

Basse Californie

;

Californie Nord

;

Californie Sud

;

Nouveau Mexique

;

Etats Unis Sud Ouest

;

Océan Pacifique Nord Est

;

Massif montagneux

;

Colorado

;

Arizona

;

Trajectoire

;

Tempête

;

Précipitation atmosphérique

;

Moyenne latitude

;

Mousson été

;

Eté

;

Climatologie

;

Pluie

;

Cyclone tropical

;

Mots-clés espagnols / Spanish Keywords

México

;

California

;

Océano Pacífico

;

America del norte

;

Estados Unidos

;

Nevada

;

Océano Pacífico Este

;

Baja California

;

California Sur

;

Nuevo Mexico

;

Estados Unidos Suroeste

;

Macizo montañoso

;

Colorado

;

Arizona

;

Tempestad

;

Precipitación atmosférica

;

Latitud media

;

Monzón verano

;

Verano

;

Climatología

;

Lluvia

;

Ciclón tropical

;

Localisation / Location

INIST-CNRS, Cote INIST : 141, 35400017186520.0010

Nº notice refdoc (ud4) : 21888982



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