El Niño & La Niña (El Niño-Southern Oscillation)
.climate.gov/...
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"El Niño given '90 percent' chance of forming this winter"
"El Niño is still warming up in the bullpen.
The infamous climate troublemaker, long promised to develop this winter, still hasn't officially arrived, federal scientists announced Thursday.
The odds remain high, however: "There is a 90 percent chance of El Niño forming this season, meaning there is a 10 percent chance it will not form," said Mike Halpert, deputy director of NOAA's Climate Prediction Center. The center is the federal organization responsible for the official El Niño declaration.
El Niño is a natural climate pattern that's defined as unusually warm seawater in the central or eastern Pacific Ocean. It affects weather patterns in the USA and around the world. Typical U.S. impacts include stormy weather in the western and southern United States, and drier, warmer conditions in parts of the north.
Although the ocean water is warm enough for an El Niño designation, Halpert said, the atmosphere above the ocean has yet to respond to this warmth. Both are needed to declare an El Nino has formed."www.usatoday.com/…
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NOAA:
EL NIÑO/SOUTHERN OSCILLATION (ENSO) |
DIAGNOSTIC DISCUSSION |
issued by
CLIMATE PREDICTION CENTER/NCEP/NWS
and the International Research Institute for Climate and Society |
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13 December 2018 |
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ENSO Alert System Status: El Niño Watch
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Synopsis: El Niño is expected to form and continue through the Northern Hemisphere winter 2018-19 (~90% chance) and through spring (~60% chance).
ENSO-neutral continued during November, despite the continuation of above-average sea surface temperatures (SSTs) across the equatorial Pacific Ocean [Fig. 1]. The latest weekly SST indices for all four Niño regions were near +1.0°C [Fig. 2]. Positive subsurface temperature anomalies (averaged across 180°-100°W) weakened slightly [Fig. 3], but above-average temperatures persist at depth across the central and eastern equatorial Pacific Ocean [Fig. 4]. However, the atmospheric anomalies largely reflected intra-seasonal variability related to the Madden-Julian Oscillation, and have not yet shown a clear coupling to the above-average ocean temperatures. For the month as a whole, atmospheric convection remained close to average near the Date Line and suppressed over Indonesia [Fig. 5]. Also, the low-level and upper level winds were mostly near average across the equatorial Pacific. The equatorial Southern Oscillation index (SOI) was negative, while the traditional SOI was near zero. Despite the above-average ocean temperatures, the overall coupled ocean-atmosphere system remained ENSO-neutral.
The majority of models in the IRI/CPC plume predict a Niño3.4 index of +0.5°C or greater to continue through the winter and spring [Fig. 6]. The official forecast favors the formation of a weak El Niño, with the expectation that the atmospheric circulation will eventually couple to the anomalous equatorial Pacific warmth. In summary, El Niño is expected to form and continue through the Northern Hemisphere winter 2018-19 (~90% chance) and spring (~60% chance; click CPC/IRI consensus forecast for the chance of each outcome for each 3-month period).
This discussion is a consolidated effort of the National Oceanic and Atmospheric Administration (NOAA), NOAA's National Weather Service, and their funded institutions. Oceanic and atmospheric conditions are updated weekly on the Climate Prediction Center web site (El Niño/La Niña Current Conditions and Expert Discussions). Forecasts are also updated monthly in the Forecast Forum of CPCs Climate Diagnostics Bulletin. Additional perspectives and analysis are also available in an ENSO blog. The next ENSO Diagnostics Discussion is scheduled for 10 January 2019.
To receive an e-mail notification when the monthly ENSO Diagnostic Discussions are released, please send an e-mail message to: ncep.list.enso-update@noaa.gov.
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Climate Prediction Center
5830 University Research Court
College Park, Maryland 20740
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