East Pacific Teleconnection Patterns from NOAA/Climate Prediction Center
Entry ID: NOAA_NWS_CPC_EP

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Summary
Abstract: [Source: NOAA Climate Prediction Center, http://www.cpc.ncep.noaa.gov/ ]

The EP pattern is evident in all months except August and September, and reflects a north-south dipole of height anomalies over the eastern North Pacific. The northern center is located in the vicinity of Alaska and the west coast of Canada, while the southern center is of opposite sign and is found near, or east of, Hawaii. During strong positive phases of the EP pattern, a deeper than normal trough is located in the vicinity of the Gulf of Alaska/ western North America, and positive height anomalies are observed farther south. This phase of the pattern is associated with a pronounced northeastward extension of the Pacific jet stream toward western North America, and with enhanced westerlies over the Pacific Northwest States, northern California, and sometimes southwestern British Columbia.

In contrast, strong negative phases of the EP pattern are associated with a pronounced split-flow configuration over the eastern North Pacific, and with reduced westerlies throughout the region. This circulation is accompanied by a confinement of the climatological mean Pacific trough to the western North Pacific, and possibly with a blocking flow configuration farther east.

The most persistent positive phase of the EP-Jet pattern occurred from 1973-1975, and the most persistent negative phase of the pattern occurred from early 1992 through mid-1993. This latter period was dominated by warm episode conditions in the equatorial Pacific, and by two distinct periods of mature ENSO conditions. During this period, the subtropical jet stream was generally stronger than normal and displaced well east of its climatological -mean position toward the southwestern United States. These conditions contributed to an end of prolonged drought conditions in California (Bell and Basist 1994), and brought abundant precipitation to the southwestern United States, particularly during the 1992/93 winter. These conditions were also associated with generally above-normal precipitation over the central United States during the year preceding the onset of the Midwest floods of June-July 1993 (Bell and Janowiak 1995, Chagnon 1996). This enhanced precipitation then contributed to above-normal soil moisture levels throughout the Midwest during the period, and to near-saturated soil conditions just prior to the onset of the floods.

Related URL
Link: GET DATA
Description: Access to EP documentation, graphs and data


Geographic Coverage
 N: 45.0 S: 0.0  E: -120.0  W: -180.0

Data Set Citation
Dataset Originator/Creator: NOAA/NWS/CPC
Dataset Title: East Pacific Teleconnection Pattern
Dataset Series Name: NOAA/NWS/CPC Indices and Forecasts
Dataset Release Date: ongoing
Dataset Release Place: Camp Springs, MD
Dataset Publisher: NOAA National Weather Service, Center for Climate Prediction
Online Resource: http://www.cpc.ncep.noaa.gov/data/teledoc/ep.shtml


Temporal Coverage
Start Date: 1950-01-01


Location Keywords
OCEAN > PACIFIC OCEAN > NORTH PACIFIC OCEAN > GULF OF ALASKA
OCEAN > PACIFIC OCEAN > NORTH PACIFIC OCEAN
OCEAN > PACIFIC OCEAN
GEOGRAPHIC REGION > NORTHERN HEMISPHERE


Data Resolution
Temporal Resolution: Monthly, Seasonal


Science Keywords
ATMOSPHERE >ALTITUDE >GEOPOTENTIAL HEIGHT    [Definition]
ATMOSPHERE >ATMOSPHERIC PRESSURE >OSCILLATIONS >EAST PACIFIC PATTERN    [Definition]
ATMOSPHERE >ATMOSPHERIC PRESSURE >PRESSURE ANOMALIES    [Definition]


ISO Topic Category
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE


Keywords
East Pacific Pattern
climate index
climate indices
forecast indices
atmospheric circulation
climate change
teleconnections


Data Set Progress
IN WORK


Originating Center
NOAA/NWS/CPC


Data Center
Climate Prediction Center, National Centers for Environmental Prediction, National Weather Service, NOAA, U.S. Department of Commerce    [Information]
Data Center URL: http://www.cpc.ncep.noaa.gov/
Dataset ID: East Pacific Pattern

Data Center Personnel
Name: ED O'LENIC
Email: Ed.Olenic at noaa.gov



Distribution
Distribution_Media: online www
Distribution_Format: ascii
Fees: none


Personnel
ED O'LENIC
Role: TECHNICAL CONTACT
Email: Ed.Olenic at noaa.gov


SCOTT A. RITZ
Role: DIF AUTHOR
Phone: 301-614-5126
Fax: 301-614-5268
Email: Scott.A.Ritz at nasa.gov
Contact Address:
NASA Goddard Space Flight Center
Global Change Master Directory
City: Greenbelt
Province or State: Maryland
Postal Code: 20771
Country: USA


Publications/References
Bell, G. D., and A. N. Basist, 1994: Seasonal Climate Summary: The
global climate of December 1992- January 1993: Mature ENSO conditions
continue in the tropical Pacific, California drought
abates. J. Climate, 7, 1581-1605.

Bell, G. D., and J. E. Janowiak, 1995: Atmospheric circulation
associated with the Midwest floods of 1993. Bull. Amer. Met. Soc., 5,
681-695.

Chagnon, S. A., 1996: The Great Midwest Flood of 1993, Westview Press,
321 pp.

Creation and Review Dates
DIF Creation Date: 2003-02-19
Last DIF Revision Date: 2009-11-04

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