1. Objective Techniques In Analog Seasonal Forecasts Objective Techniques In Analog Seasonal Forecasts Analog Forecasting Objectively Picking Analogs Tools for Interpretation The Forecast Future Developments

2. Analog Seasonal Forecasting Look at this year so far…

3. Analog Seasonal Forecasting Look at this year so far… Look for past years that are similar to this year … Look at this year so far… Look for past years that are similar to this year …

4. Analog Seasonal Forecasting Look at this year so far… Look for past years that are similar to this year … Use what subsequently happened in those past years as a forecast for what will happen this year. Look at this year so far… Look for past years that are similar to this year … Use what subsequently happened in those past years as a forecast for what will happen this year.

5. Analog Seasonal Forecasting Look at this year so far… Look for past years that are similar to this year … Use what subsequently happened in those past years as a forecast for what will happen this year. Look at this year so far… Look for past years that are similar to this year … Use what subsequently happened in those past years as a forecast for what will happen this year.

7. Southern Oscillation Index Pacific Decadal Oscillation Multivariate ENSO Index PNA Nino 3.4 Sahel Rainfall

8. Climate Indices PNA (Pacific North American Index) NAO (North Atlantic Oscillation) Jones NAO EPO (Eastern Pacific Oscillation) TNH ONI NTA (North Tropical Atlantic Index) CAR (Caribbean Index) MEI BEST Nino 3 Nino 1+2 Nino 3+4 Nino 4 Pacific Warm Pool Tropical Pacific SST EOF TNA TSA WHWP WP (West Pacific Index) QBO (Quasi-Biennial Oscillation) PDO (Pacific Decadal Oscillation) PMM (Pacific Meridional Mode) NP (North Pacific Index) PNA (Pacific North American Index) NAO (North Atlantic Oscillation) Jones NAO EPO (Eastern Pacific Oscillation) TNH ONI NTA (North Tropical Atlantic Index) CAR (Caribbean Index) MEI BEST Nino 3 Nino 1+2 Nino 3+4 Nino 4 Pacific Warm Pool Tropical Pacific SST EOF TNA TSA WHWP WP (West Pacific Index) QBO (Quasi-Biennial Oscillation) PDO (Pacific Decadal Oscillation) PMM (Pacific Meridional Mode) NP (North Pacific Index) NOI (Northern Oscillation Index) AO (Arctic Oscillation) AAO TNI Atlantic Tripole SST EOF AMO AMM (Atlantic Meridional Mode) ACE (Atlantic Accumulated Cyclone Intensities) Solar Cycle (Flux) Monthly Hurricane Total MDR Hurricanes SST Anomaly MDR - Tropics SST Anomaly Central India Monsoon Precipitation Sahel Rainfall Brazil Rainfall SW USA Monsoon Global Mean Temperature ESPI Globally integrated angular momentum NOI (Northern Oscillation Index) AO (Arctic Oscillation) AAO TNI Atlantic Tripole SST EOF AMO AMM (Atlantic Meridional Mode) ACE (Atlantic Accumulated Cyclone Intensities) Solar Cycle (Flux) Monthly Hurricane Total MDR Hurricanes SST Anomaly MDR - Tropics SST Anomaly Central India Monsoon Precipitation Sahel Rainfall Brazil Rainfall SW USA Monsoon Global Mean Temperature ESPI Globally integrated angular momentum

12. Not just the index… But sensible weather… IE Warm/Cool… Wet/Dry Not just the index… But sensible weather… IE Warm/Cool… Wet/Dry

13. Automate the Process Compare each previous year to this year… Compute a “Goodness of Fit” number… Sort “Goodness of Fit”… Print/Save results… Do this for multiple indices… Find “Consensus” analog years

28. Objective Forecast

29. The Indices: MEI CPC SOI BOM SOI ONI NINO3 TEMPS MEI CPC SOI BOM SOI ONI NINO3 TEMPS NINO4 TEMPS PNA PDO WP NINO4 TEMPS PNA PDO WP Objective Forecast

34. Analog Composites

53. November Temperature Precipitation

54. December Temperature Precipitation

55. January Temperature Precipitation

56. February Temperature Precipitation

57. March Temperature Precipitation

58. April Temperature Precipitation

60. Highs Lows

61. Period of Record Average Analog Average

68. 32F = 273.15K

72. Wind storm 9 th, 10 th or 11 th ? … Mild Thanksgiving 30dm 500H anomaly over Pacific Northwest Wind storm 9 th, 10 th or 11 th ? … Mild Thanksgiving 30dm 500H anomaly over Pacific Northwest

74. Flirt w/cold air ~12 th -14 th Cold 20 th -29 th …Possible Arctic Event(s)? Positive 500H anomaly ~ 800 west of Oregon Flirt w/cold air ~12 th -14 th Cold 20 th -29 th …Possible Arctic Event(s)? Positive 500H anomaly ~ 800 west of Oregon

76. Warm 2 nd -8 th (Early “January Thaw”?) Arctic event toward end of month? 500H/850T significant negative anomaly Warm 2 nd -8 th (Early “January Thaw”?) Arctic event toward end of month? 500H/850T significant negative anomaly

78. Cool Month Valentine’s Day Snow? 30dm 500H negative anomaly Cool Month Valentine’s Day Snow? 30dm 500H negative anomaly

80. Wind Event 17 th, 18 th or 19th? 500H anomaly positive/850T anomaly negative Wind Event 17 th, 18 th or 19th? 500H anomaly positive/850T anomaly negative

82. Active month. Wide swings in temperatures but averages out cool. Active month. Wide swings in temperatures but averages out cool.

83. Government Camp Snow

84. 2008: 4 th and 5 th 16 inches total…gone by 11 th. 2000: Snow on 6 th, snow again on 8 th and continuous snow cover through the end of the month. 1999: 21 st and 22 nd eight inches total…all melted by 27 th. 1989: Six inches on 13 th … 24 th -27 th twenty-eight inches. 1974: 18 th through 27 th seventeen inches total. 1971: Twenty-one inches on ground to start month… snowed fourty-seven inches during month. Government Camp Snow November

85. Good Great! Good Great! 2008: 4 th and 5 th 16 inches total…gone by 11 th. 2000: Snow on 6 th, snow again on 8 th and continuous snow cover through the end of the month. 1999: 21 st and 22 nd eight inches total…all melted by 27 th. 1989: Six inches on 13 th … 24 th -27 th twenty-eight inches. 1974: 18 th through 27 th seventeen inches total. 1971: Twenty-one inches on ground to start month… snowed fourty-seven inches during month. Bad Marginal Good Bad Marginal Good Government Camp Snow November

86. 23d24th25th26th27th28th29th30th31st 2008 636172 7169596155 2000 44 48 444240 36 1999 1098888888 1989 11T001TT0 1974 27 2830 3534 1971 697368 6664687472 Government Camp Snow December Snow Depth in Inches

87. 23d24th25th26th27th28th29th30th31st 2008 636172 7169596155 2000 44 48 444240 36 1999 1098888888 1989 11T001TT0 1974 27 2830 3534 1971 697368 6664687472 Government Camp Snow December Snow Depth in Inches

88. 23d24th25th26th27th28th29th30th31st 2008 636172 7169596155 2000 44 48 444240 36 1999 1098888888 1989 11T001TT0 1974 27 2830 3534 1971 697368 6664687472 Government Camp Snow December Snow Depth in Inches OK Bummer Dude

89. Further Development

90. More indices

91. Further Development More indices Write routine(s) to produce and verify historical forecasts

92. Further Development More indices Write routine(s) to produce and verify historical forecasts Index/time period weighting

93. Forecast Summary/Questions Climate Division 2 – Willamette Valley Nov Dec Jan Feb Mar Apr Temp: Precip: Above Near Near Below Near Below Near Near Above Near Below Near jlittle@odf.state.or.us jim@mail.wxnorthwest.com