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IntermtnClimateSummaryJan2006
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IntermtnClimateSummaryJan2006
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Last modified
10/6/2011 3:41:52 PM
Creation date
10/12/2007 10:18:50 AM
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Template:
Drought Mitigation
Title
Intermountain West Climate Summary
Date
1/17/2006
Description
Water Availability Task Force Meeting Presentation
Basin
Statewide
Drought Mitigation - Doc Type
Presentation
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IntermountainWestClimateSummary
(Attachment)
Path:
\Drought Mitigation\Backfile
IntermtnClimateSummaryJan2008
(Attachment)
Path:
\Drought Mitigation\DayForward
IntermtntClimateSummaryJune2006
(Attachment)
Path:
\Drought Mitigation\DayForward
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<br />INTERMOUNTAIN WEST CLIMATE SUMMARY, JANUARY 2006 <br /> <br />Intermountain West Snowpack released 01/10/06 <br /> <br />Source: USDA Natural Resources Conservation Service (NRCS) Water and Climate Center <br /> <br />The snowpack as of January 1, 2006 varies across the <br />Intermountain West Region and throughout the states. About <br />half of the state of Wyoming is above average, which is a <br />positive sign since these areas had a dry winter last year. The <br />snowpack in the central basins and the Lower North Platte <br />River basin range from near average to 70% of average. The <br />Green River basin in the west and the Upper North Platte <br />River basin in the south both have 110%-130% of average <br />snowpack. The only area with above 150% of average <br />snowpack is the Belle Fourche River basin in the northeast <br />corner of Wyoming. <br />Utah and Colorado show a distinct south-to-north <br />gradient in snowpack levels. The southern parts of both <br />states have areas below 50% of average snowpack, while the <br />northern mountains have areas where the snowpack is 130% <br />-150% of average. In Utah, the basins from the Provo and <br />Price north have above average snow pack and the basins <br />from the Upper Sevier and Dirty Devil south have below <br />average snowpack. In Colorado, the dividing line is the <br />Gunnison Basin on the \vest slope and the Arkansas basin <br />on the east. Further south (not shown) in Arizona and New <br />Mexico, all stations measure under 50% of average snowpack <br />for this time of year. This gradient is characteristic of a La <br />Nina pattern, which is developing according to NOAA. (See <br />page 16 for more ENSO information.) <br /> <br /> <br /> -- - <br />~~ ^ Ul -...J \C ~ ~ V <br />~ = Ul ~ ~ ~ ~ w ~ <br />sS 0 ~ ~ Ul <br />a -...J \C ~ ~ 0 <br /> 0 0 ~ ~ ~ <br />~ 0 w Ul <br />;- 0 0 <br />I""'f" <br />~ <br /> <br />Figure 5. Snow water equivalent (SWE) as a percent of average <br />for available monitoring sites in the Intermountain West as of <br />January 1, 2006 <br /> <br />Notes <br />Snow water equivalent (SWE) or snow water content (SWC) refers to the depth of water that would result by melting the snowpack <br />at the measurement site. SWE is determined by measuring the weight of snow on a "pillow" (like a very large bathroom scale) at the <br />SNOTEL site. Knowing the size of the pillow and the density of water, SWE is then calculated from the weight measurement. Given <br />two snow samples of the same depth, heavy, wet snow will yield a greater SWE than light, powdery snow. SWE is important in predict- <br />ing runoff and streamflow. Snowpack telemetry (SNOTEL) sites are automated stations operated by NRCS that measure snowpack. <br />In addition, SWE is measured manually at other locations called snow courses. (See page 17 for Water Supply Outlooks.) <br />Figure 5 shows the SWE based on SNOTEL and snow course sites in the Intermountain West states, compared to the 1971-2000 <br />average values. The number of SNOTEL or snow course sites varies by basin. Individual sites do not always report data due to lack <br />of snow or instrument error, these basins with incomplete data are designated in white on the map. To see the locations of individual <br />SNOTEL sites, see each state's water availability page. <br /> <br />On the Web <br />For graphs like this and snowpack graphs of other parts of the western U.S., visit: http://www.wcc.nrcs. <br />usda .gov /snowcou rse/snow _map. html. <br />For snow course and SNOTEL data updated daily, please visit one of the following sites: <br />- River basin data of SWE and precipitation: http://www.wrcc.dri.edu/snotelanom/snotelbasin. <br />- Individual station data of SWE and precipitation for SNOTEL and snow course sites: http://www.wcc. <br />nrcs.usda.gov/snowcourse/snow_rpt. html or http://www.wcc.nrcs.usda.gov/snotel/. <br />- Graphic representations of SWE and precipitation at individual SNOTEL sites: http://www.wcc.nrcs. <br />usda. gov/snow/snotel-data. html. <br /> <br />RECENT CONDITIONS I 8 <br /> <br />
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