The 2005 Water Year Nolan Doesken and Roger Pielke, Sr Atmospheric Science Department, Colorado State University
In Review
8.0 6.0 4.0 2.0 0.0 -2.0 -4.0 Oct
Nov
Dec
Eastern Plains
Jan
Feb
Mar
Foothills
Apr
May
Mountains
Jun
Jul
Aug
Sep
Western Valleys
Water Year 2005 temperature departures from 19711971-2000 average.
Colorado Statewide Average Winter (Dec-Feb) Temperature Time Series 33
Temperature
Based on 48 month SPI (1890 - September 2005)
0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0
Year
Fraction of Colorado in LongLong-Term Drought
April 1 2005 Snowpack for Colorado
Colo Statewide Ave Summer (Jun-Aug) Temperature Time Series
Average Temperature
Temperature
Average Temperature
70
31
69 68 Temperature (deg F)
29 Temperatuure (deg F)
Fraction of Colorado in Drought 1.0
Fraction (in percent)
Departure (Degrees Fahrenheit)
10.0
1890 1892 1894 1896 1898 1900 1902 1904 1906 1908 1910 1912 1914 1916 1918 1920 1922 1924 1926 1928 1930 1932 1934 1936 1938 1940 1942 1944 1946 1948 1950 1952 1954 1956 1958 1960 1962 1964 1966 1968 1970 1972 1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004
► Snow blitz across southern Rockies. ► NearNear-average snowpack in the South Platte basin. ► Mild winter (12th in a row). ► Beneficial April and early June precipitation. ► A hot and dry July. ► Below average growing season precipitation. ► A saving DenverDenver-metro rain August 33-5th. ► Overall – Above average temperature, near to slightly below average precipitation. ► October 2005 – Great moisture on the Plains!
Water Year 2005
27 25 23 21
67 66 65 64 63 62
19 61
17
18 95 19 00 19 05 19 10 19 15 19 20 19 25 19 30 19 35 19 40 19 45 19 50 19 55 19 60 19 65 19 70 19 75 19 80 19 85 19 90 19 95 20 00 20 05
18 95 19 00 19 05 19 10 19 15 19 20 19 25 19 30 19 35 19 40 19 45 19 50 19 55 19 60 19 65 19 70 19 75 19 80 19 85 19 90 19 95 20 00 20 05
60
Summer 2005 (May – September) precipitation as a percent of the 19711971-2000 average.
Colorado Statewide Reservoir Levels on October 1st for Years 1997- 2004 and Oct 1, 2005 140
Percent of Average
120
100
80
60
40
20
Water Year 2005 precipitation as a percent of the 19711971-2000 average.
WY2005 daily hydrographs, provisional data provided by the USGS.
O ct 1. 20 05
O ct 1. 20 04
O ct 1. 20 03
O ct 1. 20 02
O ct 1. 20 01
O ct 1. 20 00
O ct 1. 19 99
O ct 1. 19 98
O ct 1. 19 97
0
Colorado’ Colorado’s statewide reservoir storage graph. The 2005 reservoir storage remained below average.