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Seasonal Climate Forecast June – August 2014 (Issued: May 21, 2014) This Product is Published by the Oregon Department of Agriculture (ODA), in Cooperation.

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Presentation on theme: "Seasonal Climate Forecast June – August 2014 (Issued: May 21, 2014) This Product is Published by the Oregon Department of Agriculture (ODA), in Cooperation."— Presentation transcript:

1 Seasonal Climate Forecast June – August 2014 (Issued: May 21, 2014) This Product is Published by the Oregon Department of Agriculture (ODA), in Cooperation with the Oregon Department of Forestry (ODF). Contact: ODF Meteorologist Pete Parsons at Get related Seasonal Climate Forecast information at This Product is Published by the Oregon Department of Agriculture (ODA), in Cooperation with the Oregon Department of Forestry (ODF). Contact: ODF Meteorologist Pete Parsons at Get related Seasonal Climate Forecast information at

2 Forecast Method Notes… Analog years were obtained by tracking and comparing a variety of indices over the past several years (see Forecasting Methods). Priority was given to years with sea-surface temperatures (SSTs) most closely matching the current SSTs in the equatorial Pacific Ocean. Analog years were obtained by tracking and comparing a variety of indices over the past several years (see Forecasting Methods). Priority was given to years with sea-surface temperatures (SSTs) most closely matching the current SSTs in the equatorial Pacific Ocean. Forecasting Methods Forecasting Methods Analog years in the Cool Phase of the Pacific Decadal Oscillation (PDO) have been verifying much better than years in the Warm Phase, which intuitively makes sense, because we are currently in the Cool Phase of the PDO. Analog years in the Cool Phase of the Pacific Decadal Oscillation (PDO) have been verifying much better than years in the Warm Phase, which intuitively makes sense, because we are currently in the Cool Phase of the PDO replaced 1957 as one of the top analog years used to create this months forecast. The other analog years (1963 & 1968) remained unchanged replaced 1957 as one of the top analog years used to create this months forecast. The other analog years (1963 & 1968) remained unchanged.

3 El Niño Southern Oscillation (ENSO) Current Status and Forecast ENSO-neutral (average) conditions continue across the equatorial Pacific Ocean, but significant warming of sea- surface temperatures (SSTs) is occurring across the tropical Pacific Ocean. SSTs are now above average. ENSO-neutral (average) conditions continue across the equatorial Pacific Ocean, but significant warming of sea- surface temperatures (SSTs) is occurring across the tropical Pacific Ocean. SSTs are now above average. The Climate Prediction Center (CPC) is forecasting the development of El Niño (warm conditions) this summer. The Climate Prediction Center (CPC) is forecasting the development of El Niño (warm conditions) this summer. The analog years used in this forecast support the development of a moderate strength El Niño this coming autumn and winter. The analog years used in this forecast support the development of a moderate strength El Niño this coming autumn and winter.

4 Tropical Pacific Ocean Animated (in PowerPoint only) SSTs (top) / Anomalies (bottom) Courtesy:

5 Tropical Pacific Ocean SSTs have warmed to above average, mainly west and east Courtesy:

6 ENSO Indices El Niño La Niña ( ; ; ) ENSO-Neutral

7 La Niña La Niña conditions developed, during the winter, in 1 of the top 3 analog years. El Niño El Niño conditions developed, by the subsequent autumn, in each of the top 3 analog years. La Niña El Niño ENSO Indices ( ; ; ) ENSO-Neutral

8 Model forecasts favor ENSO-neutral conditions through spring 2014; followed by El Niño development. ENSO Predictive Models Computer models favor El Niño development this summer Courtesy: La Niña El Niño ENSO-neutral

9

10 June 2014 Forecast TemperaturesPrecipitation No significant departures from average temperatures were indicated by the top analog years. No significant departures from average temperatures were indicated by the top analog years. Rainfall slightly below average west and slightly above average east. Rainfall slightly below average west and slightly above average east.

11 July 2014 Forecast TemperaturesPrecipitation Wide ranging temperatures during analog years lowers forecast confidence. Extremes in either direction are possible. Wide ranging temperatures during analog years lowers forecast confidence. Extremes in either direction are possible. Drier than average conditions likely. Since July is typically a dry month, large negative precipitation departures are not possible. Drier than average conditions likely. Since July is typically a dry month, large negative precipitation departures are not possible.

12 August 2014 Forecast TemperaturesPrecipitation Once again, the analog years had enough variation of weather conditions to significantly lower forecast confidence. Once again, the analog years had enough variation of weather conditions to significantly lower forecast confidence. Temperatures favoring slightly cooler than average. Temperatures favoring slightly cooler than average. Near to above average precipitation likely. Near to above average precipitation likely.

13 June – August 2014 Forecast TemperaturesPrecipitation A slight tendency for a cooler and wetter than average August skews the 3-month temperature and precipitation forecast graphics to cool and damp, but forecast confidence is low. A slight tendency for a cooler and wetter than average August skews the 3-month temperature and precipitation forecast graphics to cool and damp, but forecast confidence is low. There is no clear signal, in either direction, from average conditions. There is no clear signal, in either direction, from average conditions.

14 Some Helpful Resources CPC Official US Three-Month Forecasts (Graphics): CPC Official US Three-Month Forecasts (Graphics): h ttp://www.cpc.ncep.noaa.gov/products/predictions/long_range/seasonal.php?lead=01http://www.cpc.ncep.noaa.gov/products/predictions/long_range/seasonal.php?lead=01 CPC US 30-Day & 90-Day Forecasts (Discussions): CPC US 30-Day & 90-Day Forecasts (Discussions): CPC Weekly & Monthly ENSO Discussions: CPC Weekly & Monthly ENSO Discussions: Australian Government Weekly Tropical Climate Note: Australian Government Weekly Tropical Climate Note: Australian Government ENSO Wrap-Up: Australian Government ENSO Wrap-Up: IRI ENSO Quick Look: IRI ENSO Quick Look: NRCS Western Snowpack Data & Water Supply Forecast: NRCS Western Snowpack Data & Water Supply Forecast:

15 Updated Monthly (around the 20 th ) Contact: Pete Parsons, ODF Meteorologist ODA Production support from Diana Walker and Andy Zimmerman Contact: Pete Parsons, ODF Meteorologist ODA Production support from Diana Walker and Andy Zimmerman Your Feedback is Welcome


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