United States           Natural Resources             Water and Climate Center
Department of           Conservation                          Portland, Oregon
Agriculture             Service                                               
 
          S N O W  -  P R E C I P I T A T I O N    U P D A T E
 
              Based on Mountain Data from NRCS SNOTEL Sites
                    As of MONDAY: MAY 20 , 2013
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BASIN                    ELEV.  SNOW WATER EQUIVALENT    TOTAL PRECIPITATION
 Data Site Name          (Ft)                      %                      %  
                                Current  Median  Median  Current  Average  Avg
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MOUNT ST. HELENS
 

LEWIS AND COWLITZ RIVER BASINS

 JUNE LAKE                3440    26.6     5.6   475    146.3   148.1    99 
 LONE PINE                3930    29.9    24.2   124     95.2    86.3   110 
 PARADISE                 5130    80.2    65.8   122    109.8   100.6   109 
 PIGTAIL PEAK             5800    43.2    49.3    88     68.9    71.4    96 
 POTATO HILL              4510    10.5     8.5   124     59.3    57.1   104 
 SHEEP CANYON             3990    26.8    17.0   158    132.5   111.5   119 
 SPENCER MEADOW           3400     1.5      .5   300*    80.0    88.8    90 
 SPIRIT LAKE              3520      -M      .0      *      -M    77.5      *
 SURPRISE LAKES           4290    27.0    31.7    85     94.8    87.6   108 
 SWIFT CREEK              4440    47.5    52.7    90    149.5   141.5   106 
 WHITE PASS E.S.          4440     4.7    11.1    42     41.4    38.4   108 
                                                -----                  -----
                Basin wide percent               112                    105 

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 -M   = Missing data
  *   = Data may not provide a valid measure of conditions.
Units = inches for the Current and Normal Snow Water Equivalent and 
	Total Precipitation values
 
If the Basin wide percent value is flagged as potentially
invalid, care should be taken to evaluate if the value is representative
of conditions in the basin.

The SNOW WATER EQUIVALENT Percent of Median represents the snow water
equivalent found at selected SNOTEL sites in or near the basin compared to
the Median value for those sites on this day.

The TOTAL PRECIPITATION Percent of Average represents the total precipitation
(beginning October 1st) found at selected SNOTEL sites in or near the basin
compared to the Average value for those sites on this day.

Contact your state water supply staff for assistance.

Reference period for comparison of conditions is 1981-2010.

Provisional data, subject to revision.