Long-term Precipitation Trends in Colorado Nolan Doesken Colorado State Climatologist Presented: Friday, December 12, 2008.

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Presentation transcript:

Long-term Precipitation Trends in Colorado Nolan Doesken Colorado State Climatologist Presented: Friday, December 12, 2008

Colorado Mean Annual Precipitation ( )

Of All Our Climate Observing Stations

Colorado Statewide Water Year (Oct-Sept) Precipitation

Only a Few Have Excellent Long-Term Records

Best Long Term Precipitation Time Series

Fort Collins

Kassler

Byers

Grand Lake 1NW

Grand Lake 6SSW

Hayden

Montrose #2

Cochetopa Creek

Mesa Verde

Del Norte

Trinidad City

Cheyenne Wells

Rocky Ford

Akron 4E

What is normal precipitation and how does it relate to the recent past?

Fort Collins

Kassler

Byers

Grand Lake 1NW

Grand Lake 6SSW

Hayden

Montrose #2

Cochetopa Creek

Mesa Verde

Del Norte

Trinidad City

Cheyenne Wells

Rocky Ford

Akron 4E

Colorado Snotel Sites Assessment of long term April 1 st SWE provides information on long term winter precipitation trends.

University Camp (10,300’)

Dry Lake (8,400’)

Independence Pass (10,600’)

Porphyry Creek (10,760’)

Upper San Juan (10,200’)

What is the frequency of drought?

Tracking Evapotranspiration

Seasonal (May-Sept.) Alfalfa Reference ET Tracking and understanding ET trends allows for more efficient water use planning

Seasonal Reference ET Time Series

CoAgMet and NCWCD CoAgMet’s results were compared to a similar weather network in Northern Colorado The Northern Colorado Water Conservancy District (NCWCD) weather station network is a “gold standard” for ET comparison due to their high standards for siting, maintenance, and calibration

NCWCD versus CoAgMet: North Central Region

NCWCD and CoAgMet: Lower South Platte Region

Coming Soon: Climate Trends Website Access Colorado long-term station data and station history Generate and download graph images Customizable data frequency for graphing (monthly, water year, calendar year, etc)