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Lake Powell Drought impact types: delineate dominant impacts agricultural (crops, pastures, grasslands) hydrological (rivers, groundwater, reservoirs) abnormally dry drought - moderate drought - severe drought - extreme drought - exceptional 28-Day Streamﬂow Average, as of October 7, 2009 Precipitation, Oct. 2008 - Sept. 2009 Drought Monitoring, as of October 6, 2009 Reservoir Storage as of October 1, 2009 Provided by USGS Water Watch, water.usgs.gov/waterwatch/ above average average below average Capacity of Reservoirs Reported (1,000 acre-feet) (figures do not include Lake Mead and Lake Powell) 3188 * 14,365 37,044 72 8,320 3,620 1,482 3,260 1,056 6,082 AZ 3/4 CO 76/74 ID 24/24 MT 42/45 NV 1/7 NM 13/13 OR 28/31 UT 3/28 WA 10/13 WY 3/13 Percent of Useable Contents 100 75 50 25 0 No. Reservoirs Reporting/No. Reservoirs CA 0/151 no report Drought impact types: delineate dominant impacts agricultural (crops, pastures, grasslands) hydrological (rivers, groundwater, reservoirs) abnormally dry drought - moderate drought - severe drought - extreme drought - exceptional A product of the Western Regional Climate Center and these agencies: http://drought.unl.edu/dm Southwest Weather Prepared by Anthony Artusa, CPC/NCEP/NWS/NOAA. Data from USDA, National Resources Conservation Service, National Water and Climate Center www.wcc.nrcs.usda.gov average over 1971-2000 Colorado River Reservoir Storage Data source: U.S. Bureau of Reclamation, www.usbr.gov/main/water MAF = million acre-feet; amsl = above mean sea level. Vertical red bars indicate elevation range for the year. June 15-Sept. 30 monsoon totals, compared to average: Albuquerque: 3.96 / 4.12 inches El Paso: 5.82 / 5.14 inches Phoenix: 0.87 / 2.77 inches (10th driest on record) Tucson: 2.86 / 6.06 inches (11th driest on record) Yuma: 1.86 / 1.29 inches Most forecasts predict the summer’s weak El Niño conditions will strengthen to at least moderate levels over the fall and winter. Some models forecast strong conditions, which could bring increased winter precipitation to the Southwest. In late September, the projected end-of-year reservoir storage in California was 68 percent, up from 57 percent in 2008. low <10 much below normal 10-24 below normal 25-75 normal 76-90 above normal >90 much above normal high percentile classes (based on all measurements at the location) 3350 3450 3550 3650 3750 1965 1975 1985 1995 2005 dead storage elevation elevation (feet amsl) capacity: 24.3 MAF at 3,700 feet amsl Ocotober 1, 2009 storage: 15.5 MAF at 3,635 feet amsl (64% full) Two-month change: -5.7 ft. (-0.67 MAF) 850 950 1050 1150 1250 1935 1955 1975 1995 elevation (feet amsl) dead storage elevation capacity: 25.9 MAF at 1,220 feet amsl October 1, 2009 storage: 10.9 MAF at 1,094 feet amsl (42% full) Two-month change: -0.6 ft. (-0.05 MAF) Lake Mead Percent of Long−Term (1951−2001) Average 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 125 130 135 140 145 150 < 50 > 150 Provided by NOAA’s National Climatic Data Center, www.ncdc.noaa.gov The Water Page NOVEMBER/DECEMBER 2009 | Southwest Hydrology | 37

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Lake Powell

Drought impact types:delineate dominant impactsagricultural (crops, pastures, grasslands)hydrological (rivers, groundwater, reservoirs)

abnormally drydrought - moderatedrought - severedrought - extremedrought - exceptional

28-Day Streamfl ow Average, as of October 7, 2009

Precipitation, Oct. 2008 - Sept. 2009 Drought Monitoring, as of October 6, 2009

Reservoir Storage as of October 1, 2009

Provided by USGS Water Watch, water.usgs.gov/waterwatch/

above average average below average

Capacity of Reservoirs Reported (1,000 acre-feet)(figures do not include Lake Mead and Lake Powell)

3188 * 14,365 37,044 72 8,320 3,620 1,482 3,260 1,0566,082

AZ3/4

CO76/74

ID24/24

MT42/45

NV1/7

NM13/13

OR28/31

UT3/28

WA10/13

WY3/13

Per

cent

of U

seab

le C

onte

nts

100

No. Reservoirs Reporting/No. Reservoirs

CA0/151

no re

port

Drought impact types:delineate dominant impactsagricultural (crops, pastures, grasslands)hydrological (rivers, groundwater, reservoirs)

abnormally drydrought - moderatedrought - severedrought - extremedrought - exceptional

A product of the Western Regional Climate Center and these agencies:

http://drought.unl.edu/dm

Southwest Weather

Prepared by Anthony Artusa, CPC/NCEP/NWS/NOAA.

Data from USDA, National Resources Conservation Service, National Water and Climate Center

www.wcc.nrcs.usda.gov

average over 1971-2000

Colorado River Reservoir Storage

Data source: U.S. Bureau of Reclamation, www.usbr.gov/main/water

MAF = million acre-feet; amsl = above mean sea level. Vertical red bars indicate elevation range for the year.

June 15-Sept. 30 monsoon totals, compared to average: Albuquerque: 3.96 / 4.12 inches El Paso: 5.82 / 5.14 inches Phoenix: 0.87 / 2.77 inches (10th driest on record) Tucson: 2.86 / 6.06 inches (11th driest on record) Yuma: 1.86 / 1.29 inches

Most forecasts predict the summer’s weak El Niño conditions will strengthen to at least moderate levels over the fall and winter. Some models forecast strong conditions, which could bring increased winter precipitation to the Southwest.

In late September, the projected end-of-year reservoir storage in California was 68 percent, up from 57 percent in 2008.

low <10much below

normal

10-24below

normal

25-75normal

76-90above

normal

>90much above

normal

high

percentile classes (based on all measurements at the location)