enso_evolution-status-fcsts-web

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Intraseasonal Variability Intraseasonal variability in the atmosphere (wind and pressure), which is often related to the Madden-Julian Oscillation (MJO), can significantly impact surface and subsurface conditions across the Pacific Ocean. Related to this activity: Significant weakening of the low-level easterly winds usually initiates an eastwardpropagating oceanic Kelvin wave.
Weekly Heat Content Evolution in the Equatorial Pacific During January - May 2014, the downwelling phase of a strong Kelvin wave crossed the Pacific. During May-July, positive temperature anomalies progressively disappeared from the equatorial Pacific in response to the upwelling phase of the Kelvin wave. During October-November, positive subsurface temperature anomalies increased and shifted eastward in association with the downwelling phase of a Kelvin wave. Since November, a weak upwelling phase of a Kelvin wave has shifted eastward. Oceanic Kelvin waves have alternating warm and cold phases. The warm phase is indicated by dashed lines. Down-welling and warming occur in the leading portion of a Kelvin wave, and up-welling and cooling occur in the trailing portion.
Page 1 and 2: ENSO: Recent Evolution, Current Sta
Page 3 and 4: Summary ENSO-neutral conditions con
Page 5 and 6: Niño Region SST Departures ( o C)
Page 7 and 8: Global SST Departures ( o C) During
Page 9 and 10: Change in Weekly SST Departures ove
Page 11 and 12: Central and Eastern Pacific Upper-O
Page 13: Tropical OLR and Wind Anomalies Dur
Page 17 and 18: Upper-level (200-hPa) Velocity Pote
Page 19 and 20: Oceanic Niño Index (ONI) The ONI i
Page 21 and 22: ONI (ºC): Evolution since 1950 The
Page 23 and 24: Historical El Niño and La Niña Ep
Page 25 and 26: IRI/CPC Pacific Niño 3.4 SST Model
Page 27 and 28: Atmospheric anomalies over the Nort
Page 29 and 30: Atmospheric anomalies over the Nort
Page 31 and 32: U.S. Temperature and Precipitation
Page 33: Summary ENSO-neutral conditions con

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