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ENSO Cycle: Recent Evolution, Current Status and Predictions. Update prepared by Climate Prediction Center / NCEP 19 November 2012. Summary. ENSO Alert System Status: Not Active ENSO-neutral conditions continue.*

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enso cycle recent evolution current status and predictions
ENSO Cycle: Recent Evolution, Current Status and Predictions

Update prepared by

Climate Prediction Center / NCEP 19 November 2012

summary
Summary
  • ENSO Alert System Status: Not Active
  • ENSO-neutral conditions continue.*
  • Equatorial sea surface temperatures (SST) remain above average across much of the Pacific Ocean.
  • The atmospheric circulation over the tropical Pacific is near average.
  • ENSO-neutral is favored through the Northern Hemisphere winter 2012-13.

* Note: These statements are updated once a month in association with the ENSO Diagnostics Discussion:

http://www.cpc.ncep.noaa.gov/products/analysis_monitoring/enso_advisory

recent evolution of equatorial pacific sst departures o c
Recent Evolution of Equatorial Pacific SST Departures (oC)

Time

From September 2011- January 2012, below-average SSTs were evident across much of the equatorial Pacific Ocean.

Recently, above-average SSTs have persisted across much of the tropical Pacific, with relatively weaker SST anomalies in the eastern Pacific.

Longitude

ni o region sst departures o c recent evolution
Niño Region SST Departures (oC) Recent Evolution

The latest weekly SST departures are:

Niño 4 0.7ºC

Niño 3.4 0.5ºC

Niño 3 0.2ºC

Niño 1+2 -0.5ºC

sst departures o c in the tropical pacific during the last 4 weeks
SST Departures (oC) in the Tropical Pacific During the Last 4 Weeks
  • During the last 4-weeks, equatorial SST anomalies were more than +0.5ºC between 145ºE and 140ºW. SSTs were 0.5ºC below average in a small region of the eastern Pacific.
weekly central eastern pacific upper ocean 0 300 m average temperature anomalies
Weekly Central & Eastern Pacific Upper-Ocean (0-300 m) Average Temperature Anomalies

Since April 2012, the anomalies have been positive with increases during April and June. Positive subsurface anomalies weakened during September, strengthened slightly during October, and have weakened so far in November.

sub surface temperature departures o c in the equatorial pacific
Sub-Surface Temperature Departures (oC) in the Equatorial Pacific
  • In October, positive subsurface temperature anomalies strengthened across the equatorial Pacific.
  • Recently, positive subsurface temperatures anomalies have weakened in the central Pacific.

Time

Most recent pentad analysis

Longitude

tropical olr and wind anomalies during the last 30 days
Tropical OLR and Wind AnomaliesDuring the Last 30 Days

Negative OLR anomalies (enhanced convection and precipitation, blue shading) were observed near Papua New Guinea. Positive OLR anomalies (suppressed convection and precipitation, red shading) were apparent over Indonesia and west of the Date Line.

Anomalous low-level (850-hPa) easterly winds were evident across the western Pacific Ocean.

Upper-level (200-hPa) winds were near average across the equatorial Pacific.

low level 850 hpa zonal east west wind anomalies m s 1
Low-level (850-hPa) Zonal (east-west) Wind Anomalies (m s-1)

Westerly wind anomalies (orange/red shading).

Easterly wind anomalies (blue shading).

Time

Recently, weak wind anomalies are evident across the equatorial Pacific Ocean.

Longitude

cpc iri probabilistic enso outlook updated 8 nov 2012
CPC/IRI Probabilistic ENSO Outlook(updated 8 Nov 2012)

ENSO-neutral is favored through mid-2013.

pacific ni o 3 4 sst outlook
Pacific Niño 3.4 SST Outlook
  • Most models predict either persistence or a gradual weakening of current Niño-3.4 values, with ENSO-neutral continuing into the Northern Hemisphere summer 2013.
  • The average dynamical model forecast is warmer than the statistical model mean.

Figure provided by the International Research Institute (IRI) for Climate and Society (updated 13 Nov 2012).

sst outlook ncep cfs v2 forecast issued 18 november 2012
SST Outlook: NCEP CFS.v2 Forecast Issued 18 November 2012

The CFS.v2 ensemble mean (black dashed line) predicts below-average SSTs during N. Hemisphere winter 2012-13.

CFS.v1 has been discontinued.