Wednesday, December 15, 2010

La Niña Winter Temperatures and Precipitation

  • The current La Niña is expected to persist through Winter 2010-11 and into Spring 2011.
  • Although there are many factors that can influence the Winter weather patterns, a La Niña can have a strong influence on our temperatures and precipitation during Winter.
  • The attached maps (produced from data at the Earth System Research Laoratory) are a composite of La Niña Winters that have occurred since the 1950's (November-March: 1954-55, 1955-56, 1964-65, 1970-71, 1973-74, 1975-76, 1988-89, 1999-2000). They show the temperature anomalies during La Niña events compared to the 1971-2000 normals.
  • The small areas outlined within each state are known as the "Climate Divisions" which is a better method of evaluating map patterns as opposed to a single statewide value.
  • Please note that these maps show an average of La Niña events and are to be used as guidance for the "most likely" outcome. There will always be exceptions to the average anomaly pattern so do not assume that any given La Niña will look exactly like these map patterns.
  • U.S. Pattern: La Niña events are characterized by drier than normal conditions across the southern U.S. stretching from California to Florida and up into the mid Great Plains and Midwest. And La Niña events are characterized by colder than normal temperatures from California to Washington State and across the norther tier of state to Minnesota and Wisconsin.
  • Nebraska Pattern:La Niña Winters in Nebraska are noted by large extremes in temperature but when averaged out at the end of Winter are near normal. And La Niña Winters in Nebraska are generally drier than normal.

No comments:

Post a Comment

Note: Only a member of this blog may post a comment.