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Last modified
8/11/2009 11:41:28 AM
Creation date
9/30/2006 10:14:56 PM
Metadata
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Template:
Publications
Year
1997
Title
Historical Dry and Wet Periods in Colorado (Draft Copy)
CWCB Section
Water Conservation & Drought Planning
Author
McKee, Doesken, Kleist
Description
Analysis tool used to describe both drought and wet events for periods in Colorado.
Publications - Doc Type
Tech Report
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<br />the 1980s as the wettest period in the past 100 years. The 24 and 48 month portion shows the <br /> <br />1976-1980 drought period was the worst extended drought period this century. <br /> <br />Most of the stations in the Colorado (CO) drainage have a mid to late summer maximum <br /> <br />in precipitation which is not usually the same for the higher elevations. A total of 8 sites are <br /> <br />included for the Colorado (CO) and 4 of them are below Glenwood Springs. Only 3 of these 8 <br /> <br /> <br />sites had data prior to 1905. The 3 month SPI shows recent short droughts in 1994, 1990, 1981, <br /> <br />1979, 1978 and 1976-1977. The late 1970s were the driest few years in the record. Again, the <br /> <br /> <br />period since 1980 has been the wettest period and is not very different for the period in the 1920s. <br /> <br />In the Gunnison (GU) drainage 3 of the 5 sites have data prior to 1900 so the drought <br /> <br /> <br />period 1900-1905 is very evident and well defined. Recent droughts for the 3 month SPI include <br /> <br /> <br />1990, 1978, 1976-1977, and 1972. For the Gunnison (GU) the three drought periods of the <br /> <br /> <br />1900-1905, 1950s, and later 1970s are the three for this century. The period since 1982 is the <br /> <br /> <br />wettest of this century but has not lasted as long as the wet period for 1906-1931. The figures <br /> <br /> <br />show the Gunnison (GU), Colorado (CO) and Yampa-White (YW) have much in common for <br />drought and wet periods. <br /> <br />The San Juan, Animas and Dolores (SA) drainage has only 1 site with data prior to 1906 <br /> <br />so the very dry conditions are from Durango data. The 3 month data shows recent droughts <br /> <br />involve mostly two years in 1995-1996, 1989-1990, 1980-1981, and 1976-1977. At the 24 <br /> <br /> <br />month SPI, it is clear the 1989-1990 and 1976-1977 droughts were worse and very much like the <br /> <br /> <br />droughts in the 1950s and 1930s. The San Juan, Animas and Dolores (SA) definitely experienced <br /> <br />the drought of the 1930s considerably more than the Yampa-White (YW), Colorado (CO) and <br /> <br />19 <br />
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