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"New Hampshire Winter of 2009/10 - Summary, Statistics and Historical Perspective" by MD Stampone
"New Hampshire Winter of 2009/10 - Summary, Statistics and Historical Perspective" by MD Stampone
"New Hampshire Winter of 2009/10 - Summary, Statistics and Historical Perspective" by MD Stampone
"New Hampshire Winter of 2009/10 - Summary, Statistics and Historical Perspective" by MD Stampone
"New Hampshire Winter of 2009/10 - Summary, Statistics and Historical Perspective" by MD Stampone
"New Hampshire Winter of 2009/10 - Summary, Statistics and Historical Perspective" by MD Stampone
"New Hampshire Winter of 2009/10 - Summary, Statistics and Historical Perspective" by MD Stampone
"New Hampshire Winter of 2009/10 - Summary, Statistics and Historical Perspective" by MD Stampone
"New Hampshire Winter of 2009/10 - Summary, Statistics and Historical Perspective" by MD Stampone
"New Hampshire Winter of 2009/10 - Summary, Statistics and Historical Perspective" by MD Stampone
"New Hampshire Winter of 2009/10 - Summary, Statistics and Historical Perspective" by MD Stampone
"New Hampshire Winter of 2009/10 - Summary, Statistics and Historical Perspective" by MD Stampone
"New Hampshire Winter of 2009/10 - Summary, Statistics and Historical Perspective" by MD Stampone
"New Hampshire Winter of 2009/10 - Summary, Statistics and Historical Perspective" by MD Stampone
"New Hampshire Winter of 2009/10 - Summary, Statistics and Historical Perspective" by MD Stampone
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"New Hampshire Winter of 2009/10 - Summary, Statistics and Historical Perspective" by MD Stampone

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Mary D. Stampone …

Mary D. Stampone
Department of Geography
New Hampshire State Climate Office
University of New Hampshire

Presentation to the New England - St. Lawrence Valley (NESTVAL) Geographical Society Annual Meeting.

Reference:
Stampone, M.D. (2010). New Hampshire Winter 2009/2010: Summary and Historical Context. New England - St. Lawrence Valley Geographical Society (NESTVAL), October 29 – 30, 2010, Storrs, CT.

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  • 1. New Hampshire Winter of 2009/10: Summary, Statistics and Historical Perspective NESTVAL October 30, 2010 Mary D. Stampone New Hampshire State Climatologist
  • 2. El Niño Arrives – July 2009 July 1, 2009 sea surface temperature anomalies for the equatorial eastern Pacific. (http://www.noaanews.noaa.gov/stories2009/20090709_elnino.html) By early July 2009, sea surface temperatures along the equatorial eastern Pacific reached 1°C above average indicating the development of an El Niño.
  • 3. El Niño Arrives – July 2009 Year 1975 1980 1985 1990 1995 2000 2005 2010 Warm (red) and cold (blue) episodes based on a threshold of +/- 0.5oC for the Oceanic Niño Index (ONI) [3 month running mean of ERSST.v3b SST anomalies in the Niño 3.4 region (5oN-5oS, 120o-170oW)], based on the 1971-2000 base period. (http://www.cpc.noaa.gov/products/analysis_monitoring/ensostuff/ensoyears.shtml) ONI A weak El Niño developed by early July 2009, strengthening to a moderate to strong event by February 2010.
  • 4. Typical El Niño influences on world weather patterns during December-January-February. (http://www.ncdc.noaa.gov/paleo/ctl/images/warm.gif) Influences on US Winter Weather El Niño, or the warm phase of the El Niño-Southern Oscillation (ENSO), can influence weather patterns across the continental US.
  • 5. December-January-February (A) temperature anomalies and (B) frequency of occurrence (%) for El Niñ0 events 1956 - 2005. (http://www.cpc.noaa.gov/products/precip/CWlink/ENSO/composites/) During an El Niño winter, the north Great Plains states tend to be warmer and the southeastern US tends to be cooler than normal. (A) (B) Influences on US Winter Weather
  • 6. December-January-February (A) precipitation anomalies and (B) frequency of occurrence (%) for El Niñ0 events 1956 - 2005. (http://www.cpc.noaa.gov/products/precip/CWlink/ENSO/composites/) During an El Niño winter, the western US tends to be wetter and the southeastern US tends to be cooler than normal. (A) (B) Influences on US Winter Weather
  • 7. December-January-February (A) snowfall anomalies and (B) frequency of occurrence (%) for El Niñ0 events 1956 - 2005. (http://www.cpc.noaa.gov/products/precip/CWlink/ENSO/composites/) During an El Niño winter, northern tier states tend to receive below normal snowfall. (A) (B) Influences on US Winter Weather
  • 8. December-January-February temperature distribution for (A) Northern (climate zone 01) and (B) southern (climate zone 02) New Hampshire for El Niñ0 events 1956 – 2005. (http://www.cpc.noaa.gov/products/precip/CWlink/ENSO/box_whiskers/plots/temp/temp.seas.djf.b50.e08.div.002.png) However, El Niño is not a useful indicator for seasonal forecasting in New England. (A) (B) Influences on US Winter Weather
  • 9. December-January-February precipitation distribution for (A) Northern (climate zone 01) and (B) southern (climate zone 02) New Hampshire for El Niñ0 events 1956 – 2005. (http://www.cpc.noaa.gov/products/precip/CWlink/ENSO/box_whiskers/plots/temp/temp.seas.djf.b50.e08.div.002.png) However, El Niño is not a useful indicator for seasonal forecasting in New England. (A) (B) Influences on US Winter Weather
  • 10. New England – Winter 2009/10 warmer than normal north. New England (A) temperature (°F) and (B) precipitation departures for the winter of 2009/10. (http://www.nrcc.cornell.edu/page_regional.html) Overall, the New England winter of 2009/10 was … wetter than normal south.
  • 11. New Hampshire – Winter 2009/10 Average temperature, in degrees Fahrenheit, and total precipitation, in inches, for the winter of 2009/10 and percent of normal (1971-2000). (http://www.ncdc.noaa.gov/oa/climate/research/cag3/nh.html) Winter began with near normal temperatures during December of 2009 but temperatures warmed considerably by the second week of January and continued through February. Temperature Precipitation 2010 % Normal 2010 % Normal December 23.5 98 4.25 121 January 21.9 120 2.53 74 February 26.4 125 4.17 159 Winter 23.9 113 10.95 116 Winter began with above normal precipitation (mostly snow) during December of 2009 but January remained dry with a mix of snow and rain events throughout February.
  • 12. Average daily meteorological winter (December-January-February) temperatures for New Hampshire from 1971 through 2009. (http://www.ncdc.noaa.gov/oa/climate/research/cag3/nh.html) New Hampshire – Winter 2009/10 El Niño Years: 2009/10 2006/07 2004/05 2002/03 1997/98 1994/95 1991/92 1987/88 1986/87 1982/83 1977/76 1976/77 1972/73
  • 13. Average daily meteorological winter (December-January-February) temperatures for New Hampshire El Niño winters (1971-2010). (http://www.ncdc.noaa.gov/oa/climate/research/cag3/nh.html) New Hampshire – Winter 2009/10 El Niño Years: 2009/10 2006/07 2004/05 2002/03 1997/98 1994/95 1991/92 1987/88 1986/87 1982/83 1977/76 1976/77 1972/73 Temperature(°F)
  • 14. Winter 2010/11 Outlook Moderate to strong La Niña means equal chances for above normal, normal, or below normal conditions for New England.
  • 15. The New Hampshire State Climate Office (NHSCO) resides within the Department of Geography at the University of New Hampshire. The NHSCO is officially recognized by the American Association of State Climatologists and the National Oceanic and Atmospheric Administration (NOAA). New Hampshire State Climate Office Mary D. Stampone State Climatologist

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