Snotel Narrative


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: APRIL 24 , 2017
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STATE                                                      PERCENT OF Normal
  RIVER BASIN                                     Number   Snow Water  Accum
                                                 of Sites  Equivalent  Precip
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ALASKA
  ANCHORAGE/SHIP CREEK BASIN ...................  4 of  4      55        63 
  SUSITNA BASIN ................................  3 of  5      61        55 
  NORTHERN KENAI MOUNTAINS .....................  7 of  7      66        72 
  SOUTHERN KENAI ...............................  3 of  6      52        70 
  COPPER BASIN .................................  2 of  3      75        60 
  PRINCE WILLIAM SOUND .........................  1 of  7        *       71 
  CHENA BASIN ..................................  6 of  7     139        96 
  UPPER TANANA .................................  2 of  5        *         *
  KOYUKUK BASIN ................................  2 of  6        *       66 
  CENTRAL YUKON BASIN ..........................  0 of  5        *       88 
  NORTON SOUND .................................  0 of  4        *       61 
  KUPARUK-SAGAVANIRKTOK RIVER BASIN ............  0 of  3        *       90 
  NORTHWEST ARCTIC RIVER BASIN .................  0 of  1        *         *
  SOUTHEAST ALASKA BASIN .......................  1 of  3        *       86 
ARIZONA
  VERDE RIVER BASIN ............................  0 of 10        *         *
  SAN FRANCISCO PEAKS ..........................  0 of  1        *         *
  CENTRAL MOGOLLON RIM .........................  0 of  4        *         *
  LITTLE COLORADO - SOUTHERN HEADWATERS ........  0 of  6        *         *
  UPPER SALT RIVER BASIN / WHITE MOUNTAINS .....  0 of  9        *         *
  SAN FRANCISCO / UPPER GILA RIVER BASIN .......  0 of  8        *         *
  CHUSKA MOUNTAINS .............................  0 of  2        *         *
CALIFORNIA
  NORTHERN GREAT BASIN .........................  0 of  5        *         *
  TRUCKEE RIVER ................................  0 of  9        *         *
  LAKE TAHOE ...................................  0 of  8        *         *
  CARSON RIVER .................................  0 of  9        *         *
  WALKER RIVER .................................  0 of  7        *         *
  KLAMATH ......................................  0 of 18        *         *
COLORADO
  GUNNISON RIVER BASIN .........................  0 of 16        *         *
  UPPER COLORADO RIVER BASIN ...................  3 of 31        *         *
  SOUTH PLATTE RIVER BASIN .....................  1 of 22        *         *
  LARAMIE AND NORTH PLATTE RIVER BASINS ........  0 of 12        *         *
  YAMPA AND WHITE RIVER BASINS .................  1 of 20        *         *
  ARKANSAS RIVER BASIN .........................  0 of  9        *         *
  UPPER RIO GRANDE BASIN .......................  0 of 16        *         *
  SAN MIGUEL, DOLORES, ANIMAS
     AND SAN JUAN RIVER BASIN ..................  2 of 19        *         *
IDAHO
  NORTHERN PANHANDLE REGION ....................  0 of 10        *         *
  SPOKANE RIVER BASIN ..........................  0 of 10        *         *
  CLEARWATER BASIN .............................  0 of 16        *         *
  SALMON BASIN .................................  1 of 22        *         *
  WEISER BASIN .................................  0 of  4        *         *
  PAYETTE BASIN ................................  0 of 11        *         *
  BOISE BASIN ..................................  0 of 10        *         *
  BIG WOOD BASIN ...............................  0 of  9        *         *
  LITTLE WOOD BASIN ............................  0 of  5        *         *
  BIG LOST BASIN ...............................  0 of  5        *         *
  LITTLE LOST, BIRCH BASINS ....................  1 of  4        *         *
  MEDICINE LODGE, BEAVER, CAMAS BASINS .........  1 of  4        *         *
  HENRYS FORK, TETON BASINS ....................  0 of  8        *         *
  SNAKE BASIN ABOVE PALISADES ..................  0 of 18        *         *
  WILLOW, BLACKFOOT, PORTNEUF BASINS ...........  0 of  6        *         *
  SNAKE BASIN ABOVE AMERICAN FALLS .............  0 of 29        *         *
  RAFT BASIN ...................................  0 of  2        *         *
  GOOSE CREEK BASIN ............................  0 of  2        *         *
  SALMON FALLS BASIN ...........................  0 of  5        *         *
  BRUNEAU BASIN ................................  0 of  5        *         *
  OWYHEE BASIN .................................  0 of  8        *         *
  BEAR RIVER BASIN .............................  0 of 15        *         *
MONTANA
  KOOTENAI RIVER BASIN .........................  0 of  8        *         *
  FLATHEAD RIVER BASIN .........................  2 of 16        *         *
  UPPER CLARK FORK RIVER BASIN .................  0 of 15        *         *
  BITTERROOT RIVER BASIN .......................  0 of  7        *         *
  LOWER CLARK FORK RIVER BASIN .................  0 of  8        *         *
  JEFFERSON RIVER BASIN ........................  1 of 19        *         *
  MADISON RIVER BASIN ..........................  2 of 11        *         *
  GALLATIN RIVER BASIN .........................  2 of  7        *         *
  MISSOURI HEADWATERS ..........................  4 of 31        *         *
  HEADWATERS MISSOURI MAINSTEM .................  0 of  5        *         *
  SMITH, JUDITH, AND MUSSELSHELL RIVER BASINS ..  0 of 10        *         *
  SUN, TETON AND MARIAS RIVER BASINS ...........  0 of  6        *         *
  MISSOURI MAINSTEM RIVER BASIN ................  0 of 21        *         *
  ST. MARY AND MILK RIVER BASINS ...............  0 of  3        *         *
  UPPER YELLOWSTONE RIVER BASIN ................  1 of 24        *         *
  WIND RIVER BASIN (WYOMING) ...................  0 of 13        *         *
  SHOSHONE RIVER BASIN (WYOMING) ...............  0 of  6        *         *
  BIGHORN RIVER BASIN (WYOMING) ................  0 of 16        *         *
  TONGUE RIVER BASIN (WYOMING) .................  0 of  7        *         *
  POWDER RIVER BASIN (WYOMING) .................  0 of  7        *         *
  LOWER YELLOWSTONE RIVER BASIN ................  0 of 35        *         *
NEVADA
  NORTHERN GREAT BASIN .........................  0 of  9        *         *
  SNAKE RIVER ..................................  0 of 10        *         *
  OWYHEE RIVER .................................  0 of  5        *         *
  UPPER HUMBOLDT RIVER .........................  0 of  9        *         *
  LOWER HUMBOLDT RIVER .........................  0 of  9        *         *
  CLOVER VALLEY & FRANKLIN RIVER ...............  0 of  6        *         *
  EASTERN NEVADA BASINS ........................  0 of  4        *         *
NEW MEXICO
  RIO CHAMA RIVER BASIN ........................  0 of  4        *         *
  UPPER RIO GRANDE BASIN .......................  0 of  9        *         *
  SANGRE DE CRISTO MOUNTAIN RANGE BASINS .......  0 of 11        *         *
  JEMEZ RIVER BASIN ............................  0 of  3        *         *
  SAN FRANCISCO RIVER BASIN ....................  0 of  3        *         *
  GILA RIVER BASIN .............................  0 of  3        *         *
  MIMBRES RIVER BASIN ..........................  0 of  2        *         *
  PECOS RIVER BASIN ............................  0 of  1        *         *
  SAN JUAN RIVER HEADWATERS ....................  0 of  5        *         *
  ANIMAS RIVER BASIN ...........................  2 of  7        *         *
  CIMARRON RIVER BASIN .........................  0 of  2        *         *
  ZUNI/BLUEWATER RIVER BASIN ...................  0 of  1        *         *
  RIO HONDO BASIN ..............................  0 of  1        *         *
  CHUSKA MOUNTAINS .............................  0 of  1        *         *
OREGON
  OWYHEE .......................................  0 of  8        *         *
  MALHEUR ......................................  0 of  3        *         *
  GRANDE RONDE, POWDER, BURNT, IMNAHA ..........  0 of 17        *         *
  UMATILLA, WALLA WALLA, WILLOW ................  0 of  8        *         *
  JOHN DAY .....................................  0 of 13        *         *
  UPPER DESCHUTES, CROOKED .....................  2 of 14        *         *
  HOOD, SANDY, LOWER DESCHUTES .................  4 of  8     119       116 
  COAST RANGE ..................................  1 of  2        *      139 
  WILLAMETTE ...................................  5 of 23        *         *
  ROGUE, UMPQUA ................................  0 of 12        *         *
  KLAMATH ......................................  0 of 18        *         *
  LAKE COUNTY, GOOSE LAKE ......................  0 of  9        *         *
  HARNEY .......................................  0 of  9        *         *
UTAH
  RAFT RIVER ...................................  0 of  2        *         *
  BEAR RIVER ...................................  0 of 24        *         *
  WEBER-OGDEN RIVERS ...........................  0 of 20        *         *
  PROVO R.-UTAH LAKE-JORDAN R. .................  0 of 17        *         *
  TOOELE VALLEY-VERNON CREEK ...................  0 of  4        *         *
  NORTHEASTERN UINTAHS .........................  0 of 10        *         *
  DUCHESNE RIVER ...............................  0 of 13        *         *
  PRICE-SAN RAFAEL .............................  0 of 11        *         *
  DIRTY DEVIL ..................................  0 of  6        *         *
  SOUTH EASTERN UTAH ...........................  0 of  6        *         *
  UPPER SEVIER RIVER ...........................  0 of 17        *         *
  SAN PITCH RIVER ..............................  0 of 11        *         *
  LOWER SEVIER RIVER ...........................  0 of  3        *         *
  BEAVER RIVER .................................  0 of  2        *         *
  ESCALANTE RIVER ..............................  0 of  4        *         *
  SOUTHWESTERN UTAH ............................  0 of 13        *         *
WASHINGTON
  NORTHERN PANHANDLE ...........................  0 of 10        *         *
  SPOKANE ......................................  0 of 10        *         *
  UPPER COLUMBIA ...............................  0 of  6        *         *
  CENTRAL COLUMBIA .............................  0 of  8        *         *
  UPPER YAKIMA .................................  0 of  5        *         *
  LOWER YAKIMA .................................  2 of  9        *         *
  LOWER SNAKE ..................................  0 of 22        *         *
  LOWER COLUMBIA ...............................  5 of 22        *         *
  SOUTH PUGET SOUND ............................  0 of 10        *         *
  CENTRAL PUGET SOUND ..........................  0 of  9        *         *
  NORTH PUGET SOUND ............................  0 of 12        *         *
  OLYMPIC ......................................  0 of  4        *         *
WYOMING
  SNAKE RIVER ..................................  0 of 20        *         *
  MADISON-GALLATIN .............................  1 of  5        *         *
  YELLOWSTONE ..................................  0 of 13        *         *
  WIND RIVER ...................................  0 of 12        *         *
  BIGHORN BASIN ................................  0 of 11        *         *
  SHOSHONE RIVER ...............................  0 of  5        *         *
  POWDER RIVER .................................  0 of  7        *         *
  TONGUE RIVER .................................  0 of  7        *         *
  BELLE FOURCHE ................................  0 of  1        *         *
  CHEYENNE RIVER BASIN .........................  0 of  2        *         *
  UPPER N. PLATTE ..............................  0 of 18        *         *
  SWEETWATER ...................................  0 of  3        *         *
  LOWER N. PLATTE ..............................  0 of  4        *         *
  LARAMIE RIVER ................................  0 of  6        *         *
  S. PLATTE ....................................  0 of  3        *         *
  LITTLE SNAKE RIVER ...........................  0 of  8        *         *
  UPPER GREEN RIVER ............................  0 of 13        *         *
  LOWER GREEN RIVER ............................  0 of 11        *         *
  UPPER BEAR RIVER .............................  0 of  9        *         *
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   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 Accumulated 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.

    * = Data are not available or data may not provide a valid measure 
        of conditions for over half of the sites within the basin.  
        Refer to the individual state reports for a complete data 
        listing and basin analysis.

Units = inches for the Current and Normal Snow Water Equivalent and
        Total Precipitation values

          Medians and averages are calculated for the period 1981-2010.

                   Provisional data, subject to revision.
                   
   * Site -- Either: (a) the current value is missing; (b) the median or 
   	 average for the day is not available or is zero; or (c) for snow water 
   	 equivalent, the median for the day is less than 10% of the maximum 
   	 median value for  the year.
   	 
   * Basin - More than half of the sites within the basin are flagged with *, 
     preventing the calculation of a meaningful basin index.  
     
   The basin index is calculated as the sum of the valid current values 
   divided by the sum of the corresponding medians (for snow water equivalent) 
   or averages (for precipitation) and the resulting fraction multiplied by 100.        
                   

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