1. Drought Update September 2005 WATF Meeting Roger A. Pielke, Sr. Colorado Climate Center presented at the Water Availability Task Force meeting, Division of Wildlife, Denver, CO, September 14, 2005 Prepared by Odie Bliss http://ccc.atmos.colostate.edu

2. July 2005 http://www.ncdc.noaa.gov/oa/climate/research/2005/jul/extremes.html

3. Colorado Average Temperatures http://www.ncdc.noaa.gov/oa/climate/research/cag3/co.html

4. Colorado Total Precipitation

5. July 2005 Tmax

6. July 2005 Tmin

7. July 2005 Precipitation

8. http://www.ncdc.noaa.gov/oa/climate/research/prelim/drought/st005dv00pcp.html August 2005

9. http://www.ncdc.noaa.gov/oa/climate/research/prelim/drought/st005dv00pcp.html

11. Colorado Precipitation Ranking 1895-2005 http://www.ncdc.noaa.gov/oa/climate/research/prelim/drought/st005dv00pcp.html

12. Climate divisions defined by Dr. Klaus Wolter of NOAA's Climate Diagnostic Center in Boulder, CO

13. Division 1– Grand Lake 1NW

14. Division 1– Taylor Park

15. Division 2– Collbran

16. Division 2 – Grand Junction

17. Division 3 – Montrose

18. Division 3 – Cochetopa Creek

19. Division 3 – Mesa Verde

20. Division 4 – Del Norte

21. Division 4 – Center 4SSW

22. Division 5 – Colorado Springs

23. Division 5 – Pueblo

24. Division 5 – Buena Vista

25. Division 5 – Canon City

26. Division 6 – Cheyenne Wells

27. Division 7 – Akron

28. Division 7 – Leroy

29. Division 7 – Burlington

30. Division 8 – Boulder

31. Division 8 – Cheesman

32. Division 8 – Kassler

33. Division 8 – Fort Collins

34. August 2005 maximum temperatures

35. August 2005 Maximum Temperature http://www.ocs.oregonstate.edu/prism

36. August 2005 minimum temperatures

37. http://www.ocs.oregonstate.edu/prism August 2005 Minimum Temperature

38. August 2005 Average Temperatures

39. August 2005 precipitation

40. August 2005 Precipitation http://www.ocs.oregonstate.edu/prism

41. WY 2005 precipitation

42. 3 Month SPI

43. 12 Month SPI

44. 48 Month SPI

45. Fraction of Colorado in Drought

46. Projected Conditions at 0.2 Probability Level 12 Month SPI at 6 months

47. Projected Conditions at 0.5 Probability Level 12 Month SPI at 6 months

48. Projected Conditions at 0.8 Probability Level 12 Month SPI at 6 months

49. Projected Conditions at 0.2 Probability Level 48 Month SPI at 12 months

50. Projected Conditions at 0.5 Probability Level 48 Month SPI at 12 months

51. Projected Conditions at 0.8 Probability Level 48 Month SPI at 12 months

52. Drought Monitor Map

53. July 2005 Heat Wave Highest maximum temperature recorded in Colorado in July 2005 for selected stations.

54. Colorado Springs, DIA, Grand Junction and Fort Collins daily maximum and minimum temperatures for July 2005.

55. Denver Intl AP July 2005 Records July 2005New RecordOld RecordYear Last Occurred 16th1021012003 19th1011001934 20th1051021939 21st1041001981 22nd1021001931 23rd1021011910 Data Source: NWS F-6 form

56. Table 1. Average maximum, minimum and mean temperatures for July 2005 and their rank for the period-of-record.

57. Table 1 continued

58. Table 2. Number of Days that the July 2005 maximum temperature was greater than or equal to 90  F and 100  F and their rank for the period-of-record.

59. Table 3. July 2005 highest maximum temperature, the rank for the period-of- record, the date it occurred, the highest ever July temperature and the year it occurred, and the absolute maximum temperature and the date.

60. Table 3. continued

61. Denver’s 5-day running average if the average temperature was greater than or equal to 83  F or greater. Plotted by decade.

62. Edgewater and Lakewood 5-day running average for average temperature greater than or equal to 80 deg F.

63. Fort Collins 5-day running average for average temperature greater than or equal to 80 deg F. The Bus Transfort construction begin in 2002 next to this station.

64. Hourly data from automated weather stations at FCL and DIA are used to pick and calculate the highest air temperature and effective temperature for each day in July 2002. In all three months, the average high air temperature is higher at DIA, while the average high effective temperature is higher at FCL.

65. Hourly data from automated weather stations at FCL and DIA are used to pick and calculate the highest air temperature and effective temperature for each day in July 2003. In all three months, the average high air temperature is higher at DIA, while the average high effective temperature is higher at FCL.

66. Hourly data from automated weather stations at FCL and DIA are used to pick and calculate the highest air temperature and effective temperature for each day in July 2005. In all three months, the average high air temperature is higher at DIA, while the average high effective temperature is higher at FCL.

67. A daily composite of air temperature (red line) and effective temperature (blue line). The composite is created by averaging hourly data during the five days with highest air temperature in each of the three years considered in this section – fifteen days total. This shows the pattern of heating and cooling on the station’s extreme hottest days. Note how the effective temperature peaks approximately four hours before the air temperature peaks. Typically, the hottest days are characterized by exceptionally low relative humidity in the late afternoon, which explains the premature drop in effective temperature.

68. Colorado Climate Center Colorado State University Data and Power Point Presentations available for downloading http://ccc.atmos.colostate.edu – click on “Drought” – then click on “Presentations”