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 SUNDAY: JULY 23 , 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        *       70 
  SUSITNA BASIN ................................  3 of  5        *       66 
  NORTHERN KENAI MOUNTAINS .....................  7 of  7        *       81 
  SOUTHERN KENAI ...............................  3 of  6        *       77 
  COPPER BASIN .................................  2 of  3        *       74 
  PRINCE WILLIAM SOUND .........................  1 of  7        *         *
  CHENA BASIN ..................................  6 of  7        *       98 
  UPPER TANANA .................................  2 of  5        *         *
  KOYUKUK BASIN ................................  2 of  6        *       62 
  CENTRAL YUKON BASIN ..........................  0 of  5        *       83 
  NORTON SOUND .................................  0 of  4        *       72 
  KUPARUK-SAGAVANIRKTOK RIVER BASIN ............  0 of  3        *         *
  NORTHWEST ARCTIC RIVER BASIN .................  0 of  1        *         *
  SOUTHEAST ALASKA BASIN .......................  1 of  3        *       93 
ARIZONA
  VERDE RIVER BASIN ............................  4 of 10        *      125 
  SAN FRANCISCO PEAKS ..........................  1 of  1        *      133 
  CENTRAL MOGOLLON RIM .........................  3 of  4        *      127 
  LITTLE COLORADO - SOUTHERN HEADWATERS ........  5 of  6        *      123 
  UPPER SALT RIVER BASIN / WHITE MOUNTAINS .....  7 of  9        *      109 
  SAN FRANCISCO / UPPER GILA RIVER BASIN .......  7 of  8        *      100 
  CHUSKA MOUNTAINS .............................  0 of  2        *         *
CALIFORNIA
  NORTHERN GREAT BASIN .........................  3 of  5        *      134 
  TRUCKEE RIVER ................................  8 of  9        *      197 
  LAKE TAHOE ...................................  8 of  8        *      208 
  CARSON RIVER .................................  6 of  9        *         *
  WALKER RIVER .................................  7 of  7        *      200 
  KLAMATH ...................................... 10 of 18        *         *
COLORADO
  GUNNISON RIVER BASIN .........................  9 of 16        *      105 
  UPPER COLORADO RIVER BASIN ................... 23 of 31        *      105 
  SOUTH PLATTE RIVER BASIN ..................... 16 of 22        *      112 
  LARAMIE AND NORTH PLATTE RIVER BASINS ........ 11 of 12        *      109 
  YAMPA AND WHITE RIVER BASINS ................. 17 of 20        *       99 
  ARKANSAS RIVER BASIN .........................  5 of  9        *      115 
  UPPER RIO GRANDE BASIN .......................  9 of 16        *      106 
  SAN MIGUEL, DOLORES, ANIMAS
     AND SAN JUAN RIVER BASIN .................. 14 of 19        *      106 
IDAHO
  NORTHERN PANHANDLE REGION ....................  6 of 10        *      128 
  SPOKANE RIVER BASIN ..........................  9 of 10        *      122 
  CLEARWATER BASIN ............................. 14 of 16        *      114 
  SALMON BASIN ................................. 21 of 22        *      130 
  WEISER BASIN .................................  3 of  4        *      122 
  PAYETTE BASIN ................................ 10 of 11        *      137 
  BOISE BASIN ..................................  8 of 10        *      149 
  BIG WOOD BASIN ...............................  8 of  9        *      156 
  LITTLE WOOD BASIN ............................  5 of  5        *      156 
  BIG LOST BASIN ...............................  5 of  5        *      154 
  LITTLE LOST, BIRCH BASINS ....................  4 of  4        *      129 
  MEDICINE LODGE, BEAVER, CAMAS BASINS .........  4 of  4        *      121 
  HENRYS FORK, TETON BASINS ....................  8 of  8        *      137 
  SNAKE BASIN ABOVE PALISADES .................. 17 of 18        *      146 
  WILLOW, BLACKFOOT, PORTNEUF BASINS ...........  6 of  6        *      142 
  SNAKE BASIN ABOVE AMERICAN FALLS ............. 28 of 29        *      142 
  RAFT BASIN ...................................  1 of  2        *      144 
  GOOSE CREEK BASIN ............................  2 of  2        *      126 
  SALMON FALLS BASIN ...........................  5 of  5        *      124 
  BRUNEAU BASIN ................................  5 of  5        *      127 
  OWYHEE BASIN .................................  8 of  8        *      129 
  BEAR RIVER BASIN ............................. 15 of 15        *      140 
MONTANA
  KOOTENAI RIVER BASIN .........................  7 of  8        *      120 
  FLATHEAD RIVER BASIN ......................... 13 of 16        *      117 
  UPPER CLARK FORK RIVER BASIN ................. 13 of 15        *      108 
  BITTERROOT RIVER BASIN .......................  7 of  7        *      111 
  LOWER CLARK FORK RIVER BASIN .................  8 of  8        *      120 
  JEFFERSON RIVER BASIN ........................ 17 of 19        *      110 
  MADISON RIVER BASIN .......................... 11 of 11        *      118 
  GALLATIN RIVER BASIN .........................  7 of  7        *      111 
  MISSOURI HEADWATERS .......................... 29 of 31        *      112 
  HEADWATERS MISSOURI MAINSTEM .................  5 of  5        *       98 
  SMITH, JUDITH, AND MUSSELSHELL RIVER BASINS ..  9 of 10        *       93 
  SUN, TETON AND MARIAS RIVER BASINS ...........  5 of  6        *      109 
  MISSOURI MAINSTEM RIVER BASIN ................ 19 of 21        *       99 
  ST. MARY AND MILK RIVER BASINS ...............  3 of  3        *      113 
  UPPER YELLOWSTONE RIVER BASIN ................ 21 of 24        *      121 
  WIND RIVER BASIN (WYOMING) ................... 11 of 13        *      154 
  SHOSHONE RIVER BASIN (WYOMING) ...............  5 of  6        *      149 
  BIGHORN RIVER BASIN (WYOMING) ................ 15 of 16        *      126 
  TONGUE RIVER BASIN (WYOMING) .................  6 of  7        *      113 
  POWDER RIVER BASIN (WYOMING) .................  6 of  7        *      104 
  LOWER YELLOWSTONE RIVER BASIN ................ 30 of 35        *      132 
NEVADA
  NORTHERN GREAT BASIN .........................  6 of  9        *      139 
  SNAKE RIVER ..................................  7 of 10        *      126 
  OWYHEE RIVER .................................  5 of  5        *      130 
  UPPER HUMBOLDT RIVER .........................  9 of  9        *      136 
  LOWER HUMBOLDT RIVER .........................  5 of  9        *      133 
  CLOVER VALLEY & FRANKLIN RIVER ...............  4 of  6        *      136 
  EASTERN NEVADA BASINS ........................  4 of  4        *      103 
NEW MEXICO
  RIO CHAMA RIVER BASIN ........................  4 of  4        *      125 
  UPPER RIO GRANDE BASIN .......................  7 of  9        *      101 
  SANGRE DE CRISTO MOUNTAIN RANGE BASINS .......  9 of 11        *      103 
  JEMEZ RIVER BASIN ............................  2 of  3        *       90 
  SAN FRANCISCO RIVER BASIN ....................  3 of  3        *       92 
  GILA RIVER BASIN .............................  3 of  3        *      103 
  MIMBRES RIVER BASIN ..........................  2 of  2        *      107 
  PECOS RIVER BASIN ............................  1 of  1        *       85 
  SAN JUAN RIVER HEADWATERS ....................  3 of  5        *       93 
  ANIMAS RIVER BASIN ...........................  7 of  7        *      107 
  CIMARRON RIVER BASIN .........................  2 of  2        *      102 
  ZUNI/BLUEWATER RIVER BASIN ...................  1 of  1        *      130 
  RIO HONDO BASIN ..............................  0 of  1        *       88 
  CHUSKA MOUNTAINS .............................  0 of  1        *         *
OREGON
  OWYHEE .......................................  8 of  8        *      129 
  MALHEUR ......................................  3 of  3        *      120 
  GRANDE RONDE, POWDER, BURNT, IMNAHA .......... 14 of 17        *      122 
  UMATILLA, WALLA WALLA, WILLOW ................  5 of  8        *      119 
  JOHN DAY ..................................... 12 of 13        *      118 
  UPPER DESCHUTES, CROOKED ..................... 12 of 14        *      124 
  HOOD, SANDY, LOWER DESCHUTES .................  8 of  8        *      117 
  COAST RANGE ..................................  1 of  2        *      137 
  WILLAMETTE ................................... 15 of 23        *      124 
  ROGUE, UMPQUA ................................ 11 of 12        *      133 
  KLAMATH ...................................... 10 of 18        *         *
  LAKE COUNTY, GOOSE LAKE ......................  3 of  9        *         *
  HARNEY .......................................  8 of  9        *      114 
UTAH
  RAFT RIVER ...................................  1 of  2        *      144 
  BEAR RIVER ................................... 18 of 24        *      143 
  WEBER-OGDEN RIVERS ........................... 17 of 20        *      126 
  PROVO R.-UTAH LAKE-JORDAN R. ................. 13 of 17        *      117 
  TOOELE VALLEY-VERNON CREEK ...................  3 of  4        *      113 
  NORTHEASTERN UINTAHS .........................  5 of 10        *      108 
  DUCHESNE RIVER ............................... 12 of 13        *      127 
  PRICE-SAN RAFAEL .............................  6 of 11        *      120 
  DIRTY DEVIL ..................................  2 of  6        *      112 
  SOUTH EASTERN UTAH ...........................  3 of  6        *       94 
  UPPER SEVIER RIVER ........................... 11 of 17        *      101 
  SAN PITCH RIVER ..............................  5 of 11        *         *
  LOWER SEVIER RIVER ...........................  1 of  3        *         *
  BEAVER RIVER .................................  2 of  2        *         *
  ESCALANTE RIVER ..............................  2 of  4        *       95 
  SOUTHWESTERN UTAH ............................ 10 of 13        *      105 
WASHINGTON
  NORTHERN PANHANDLE ...........................  6 of 10        *      128 
  SPOKANE ......................................  9 of 10        *      122 
  UPPER COLUMBIA ...............................  5 of  6        *      126 
  CENTRAL COLUMBIA .............................  7 of  8        *      114 
  UPPER YAKIMA .................................  3 of  5        *      105 
  LOWER YAKIMA .................................  6 of  9        *      126 
  LOWER SNAKE .................................. 19 of 22        *      117 
  LOWER COLUMBIA ............................... 15 of 22        *      130 
  SOUTH PUGET SOUND ............................  6 of 10        *      113 
  CENTRAL PUGET SOUND ..........................  6 of  9        *         *
  NORTH PUGET SOUND ............................  8 of 12        *         *
  OLYMPIC ......................................  2 of  4        *      135 
WYOMING
  SNAKE RIVER .................................. 19 of 20        *      144 
  MADISON-GALLATIN .............................  5 of  5        *      125 
  YELLOWSTONE .................................. 11 of 13        *      129 
  WIND RIVER ................................... 10 of 12        *      153 
  BIGHORN BASIN ................................ 10 of 11        *      110 
  SHOSHONE RIVER ...............................  4 of  5        *      152 
  POWDER RIVER .................................  6 of  7        *      104 
  TONGUE RIVER .................................  6 of  7        *      113 
  BELLE FOURCHE ................................  1 of  1        *       91 
  CHEYENNE RIVER BASIN .........................  2 of  2        *       86 
  UPPER N. PLATTE .............................. 11 of 18        *      106 
  SWEETWATER ...................................  3 of  3        *      157 
  LOWER N. PLATTE ..............................  4 of  4        *       96 
  LARAMIE RIVER ................................  4 of  6        *      101 
  S. PLATTE ....................................  1 of  3        *      103 
  LITTLE SNAKE RIVER ...........................  6 of  8        *      101 
  UPPER GREEN RIVER ............................ 12 of 13        *      153 
  LOWER GREEN RIVER ............................  6 of 11        *      133 
  UPPER BEAR RIVER .............................  7 of  9        *      132 
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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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