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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
75
50
25
0
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)
3350
3450
3550
3650
3750
1965 1975 1985 1995 2005
dead storage elevation
elev
atio
n (fe
et a
msl
)
capacity: 24.3 MAF at 3,700 feet amsl
Ocotober 1, 2009 storage: 15.5 MAFat 3,635 feet amsl (64% full)
Two-month change: -5.7 ft. (-0.67 MAF)
850
950
1050
1150
1250
1935 1955 1975 1995
elev
atio
n (fe
et a
msl
)
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
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NOVEMBER/DECEMBER 2009 | Southwest Hydrology | 37