Global Climate Change Digest: Main Page | Introduction | Archives | Calendar | Copy Policy | Abbreviations | Guide to Publishers

GCRIO Home ->arrow Library ->arrow Archives of the Global Climate Change Digest ->arrow May 1999 ->arrow La Nina-Tornado Link Search

U.S. Global Change Research Information Office logo and link to home

Last Updated:
February 28, 2007

GCRIO Program Overview



Our extensive collection of documents.


Get Acrobat Reader

Privacy Policy

Global Climate Change DigestArchives of the
Global Climate Change Digest

A Guide to Information on Greenhouse Gases and Ozone Depletion
Published July 1988 through June 1999


La Nina-Tornado Link

Item #d99may52

According to a May 7, 1999, story by Joseph B. Verrengia carried on the AP wire, the National Weather Service has established a statistical link between La Niña and the incidence of tornadoes on the central Plains. By early May, Nebraska and Iowa had already experienced 17 tornadoes, 5 more than normal. La Niña produced a stronger, colder jet stream in the upper atmosphere. At the same time, warm, wet low-level air was pulled up into the Plains states from the Gulf of Mexico, an unstable combination. Most La Niñas last only a couple of months, but this one has persisted for nearly a year. During the most recent El Niño, the incidence of tornadoes was reduced by up to 24% in some regions, according to some studies.

  • Guide to Publishers
  • Index of Abbreviations

  • Hosted by U.S. Global Change Research Information Office. Copyright by Center for Environmental Information, Inc. For more information contact U.S. Global Change Research Information Office, Suite 250, 1717 Pennsylvania Ave, NW, Washington, DC 20006. Tel: +1 202 223 6262. Fax: +1 202 223 3065. Email: Web: Webmaster:
    U.S. Climate Change Technology Program Intranet Logo and link to Home