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Picture: Spill at Pathfinder Dam, North Platte River June 2011

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Missouri Basin Forecasters Meeting – February 20-21, 2013. Cara McCarthy Natural Resources Conservation Service Snow Survey and Water Supply Forecast Program National Water and Climate Center Portland, OR. Picture: Spill at Pathfinder Dam, North Platte River June 2011.

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slide1

Missouri Basin Forecasters Meeting – February 20-21, 2013

Cara McCarthy

Natural Resources Conservation Service

Snow Survey and Water Supply Forecast Program

National Water and Climate Center

Portland, OR

Picture:

Spill at Pathfinder Dam,

North Platte River

June 2011

Entry to Geneva Park Snow Course, South Platte, for February 1st, 2013 Measurement,

60% of Normal

slide2

Water Supply Forecasts/Current Conditions

  • A SNOTEL site you should not use for SWE
  • Snow Course Reductions
  • Change to 1981-2010 SWE Medians

Sawtooth Snow Course, South Platte

Feb 1st Measurement

slide11

February 1, 2013

Snow Water Equivalent

as % of Normal (Median)

slide14

SNOTEL

Month-to-Date Precipitation

% of Normal

February 18, 2013

slide15

Change in SNOTEL Snow Water Equivalent since February 1

Feb 18, 2013

SWE

% Normal

Feb 1, 2013

SWE

% of Normal

new normals this year
New Normals this Year
  • Every decade the 30 year normals change periods.
  • This year we go from the 1971-2000 period to the 1981-2010 period.
  • The change is meant to keep pace with current climatic conditions as the most recent years are said to represent the current conditions.
  • Most data types are calculated as a straight average except Snow Water Equivalent which is “median” or “middle value”
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Questions?

www.wcc.nrcs.usda.gov

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