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1. INTRODUCTION Large-scale anomalies of the atmospheric
 

Summary: 1. INTRODUCTION
Large-scale anomalies of the atmospheric
circulation were present over the continental U.S.
during the El Nino/La Nina cycle of 1997-2000
(Bell et al. 1999, Bell et. al 2000). Since the large-
scale circulation affects the seasonal distribution
of large mesoscale convective systems (MCSs)
(Fritsch et. al. 1986, Augustine and Howard 1991),
it is of interest to document MCS activity during
the 1997-2000 El Nino/La Nina. Anderson and
Arritt (2001) have documented large MCSs during
the 1997-1998 El Nino. A summary of large MCSs
during the 1998-2000 La Nina is provided here.
2. DATA AND METHODOLOGY
Characteristics of cloud shields in hourly
GOES-8 infrared imagery were documented with
an automated routine (Augustine 1985, Anderson
and Arritt 1998). Large, long-lived MCSs were
classified as either mesoscale convective com-
plexes (MCCs) or persistent elongated convective

  

Source: Arritt, Raymond W. - Department of Agronomy, Iowa State University

 

Collections: Environmental Sciences and Ecology; Geosciences