2017 OMSI Meeting NWS Portland Evan Bentley Meteorologist

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Transcripción de la presentación:

2017 OMSI Meeting NWS Portland Evan Bentley Meteorologist Winter 2017-18 Outlook 2017 OMSI Meeting NWS Portland Evan Bentley Meteorologist Oct. 28th, 2017

Questions I will Try To Answer El Nino or La Nina This Winter? Below, near or above average temperatures this winter? Below, near or above average precipitation this winter?

The only questions you really care about…

How did we do last year?

How did we do last year?

El Niño Southern Oscillation (ENSO) USA USA Pacific Ocean Pacific Ocean Warmer than usual ocean temperatures Cooler than usual ocean temperatures

Classifying ENSO Phases >1.9°C Very Strong El Niño 1.5 to 1.9°C Strong El Niño 1.0 to 1.4°C Moderate El Niño 0.5 to 0.9°C Weak El Niño 0.4 to -0.4°C Neutral -0.5 to -0.9°C Weak La Niña -1.0 to -1.4°C Moderate La Niña -1.5 to -1.9°C Strong La Niña <-1.9°C Very Strong La Niña

2016 La Niña Sea Surface Temperature Anomalies Slightly cooler than usual Mexico Australia Weak La Niña La Niña Neutral El Niño -2.0° (°C) -1.0° -0.5° 0.5° 1.0° 2.0°

2017 La Niña Sea Surface Temperature Anomalies Slightly cooler than usual Mexico Australia Weak La Niña La Niña Neutral El Niño -2.0° (°C) -1.0° -0.5° 0.5° 1.0° 2.0°

Climate Model Predictions El Niño Neutral Weak Moderate La Niña Strong Very Strong

Winter 2017-18 Outlook 55%-65% chance of La Niña developing Weak and potentially short-lived 70% chance last year at this time. Next update from the Climate Prediction Center: November 16

Weak La Niña Composite Temperature Anomalies

Weak La Niña Composite Precipitation Anomalies

CPC Outlook Basics 100% Climatology: Higher: 33% Lower: 33% Usual: 33% Chance of higher/more than usual Chance of lower/less than usual Chance of around usual 100% Climatology: Higher: 33% Lower: 33% Usual: 33%

Winter 2017-2018 Outlook

Lowland Snowfall History 1950 to present (DJF period) Portland Downtown Top 10 Snowiest Winters: 33.4” 1949-50 La Niña 25.7” 1968-69 El Niño 24.4” 1955-56 La Niña 20.3” 1959-60 ENSO Neutral 17.4” 1992-93 ENSO Neutral 16.3” 1979-80 El Niño 15.5” 2016-17 ENSO Neutral 14.7” 1970-71 La Niña 14.3” 2008-09 La Niña 13.4” 1964-65 La Niña Portland Airport Top 10 Snowiest Winters: 44.5” 1949-50 La Niña 34.0” 1968-69 El Niño 24.2” 2008-09 La Niña 22.4” 1955-56 La Niña 14.1” 1992-93 ENSO Neutral 13.5” 1994-95 El Niño 13.1” 1950-51 ENSO Neutral 12.9” 1959-60 ENSO Neutral 12.4” 1979-80 El Niño 12.3” 2003-04 ENSO Neutral 9.6” 2016-17 ENSO Neutral 30% were ENSO Neutral 50% were La Niña 20% were El Niño 40% were ENSO Neutral 30% were La Niña 30% were El Niño

Root for Neutral! Portland Downtown 2”+ snow events (since 1990) 10.0” 02/12/95 2.5” 01/18/12 8.0” 12/20/08 2.5” 01/10/98 7.5” 02/19/93 2.0” 02/08/14 6.8” 01/10/17 2.0” 12/24/08 6.0” 01/06/04 2.0” 12/23/08 6.0” 12/31/92 2.0” 12/21/08 5.0” 01/11/17 2.0” 12/24/98 4.0” 01/16/07 2.0” 01/09/98 3.5” 02/06/14 2.0” 12/07/92 3.0” 12/29/09 2.0” 12/19/90 2.5” 02/07/14 2.0” 02/12/90 Portland Airport 2”+ snow events (since 1990) 12.0” 02/12/95 2.5” 01/10/98 7.0” 12/20/08 2.5” 01/23/93 6.6” 01/27/96 2.5” 12/31/92 6.5” 01/10/17 2.3” 12/14/16 6.1” 02/19/93 2.3” 01/04/09 5.2” 02/12/90 2.3” 12/31/03 5.0” 01/11/98 2.3” 02/15/90 4.5” 01/06/04 2.2” 02/08/14 3.8” 02/06/14 2.2” 01/07/04 3.4” 12/22/08 2.0” 12/21/08 3.1” 12/24/08 2.0” 12/24/98 3.0” 01/16/07 2.0” 02/24/94 50% were ENSO Neutral 27% were La Niña 23% were El Niño 58% were ENSO Neutral 29% were La Niña 17% were El Niño

Root for Neutral! Portland Downtown 2”+ snow events (since 1990) 10.0” 02/12/95 2.5” 01/18/12 2.5” 01/10/98 7.5” 02/19/93 2.0” 02/08/14 6.8” 01/10/17 6.0” 01/06/04 6.0” 12/31/92 5.0” 01/11/17 2.0” 12/24/98 4.0” 01/16/07 2.0” 01/09/98 3.5” 02/06/14 2.0” 12/07/92 3.0” 12/29/09 2.0” 12/19/90 2.5” 02/07/14 2.0” 02/12/90 Portland Airport 2”+ snow events (since 1990) 12.0” 02/12/95 2.5” 01/10/98 2.5” 01/23/93 6.6” 01/27/96 2.5” 12/31/92 6.5” 01/10/17 2.3” 12/14/16 6.1” 02/19/93 2.3” 01/04/09 5.2” 02/12/90 2.3” 12/31/03 5.0” 01/11/98 2.3” 02/15/90 4.5” 01/06/04 2.2” 02/08/14 3.8” 02/06/14 2.2” 01/07/04 2.0” 12/24/98 3.0” 01/16/07 2.0” 02/24/94 61% were ENSO Neutral 11% were La Niña 28% were El Niño 65% were ENSO Neutral 15% were La Niña 20% were El Niño

Mt. Hood Snowfall

Mt. Bachelor Snowfall

Mountain Temperatures

Mountain Precipitation

Questions?

Runoff vs. ENSO