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: NOVEMBER 20 , 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      49        84 
  SUSITNA BASIN ................................  3 of  5     110       154 
  NORTHERN KENAI MOUNTAINS .....................  7 of  7      43        82 
  SOUTHERN KENAI ...............................  3 of  6      92*       83 
  COPPER BASIN .................................  2 of  3      34        94 
  PRINCE WILLIAM SOUND .........................  1 of  7        *       95 
  CHENA BASIN ..................................  5 of  7     207       226 
  UPPER TANANA .................................  2 of  5        *         *
  KOYUKUK BASIN ................................  2 of  6        *      131 
  CENTRAL YUKON BASIN ..........................  0 of  5        *      218 
  NORTON SOUND .................................  0 of  4        *      232 
  KUPARUK-SAGAVANIRKTOK RIVER BASIN ............  0 of  3        *      162 
  NORTHWEST ARCTIC RIVER BASIN .................  0 of  1        *         *
  SOUTHEAST ALASKA BASIN .......................  1 of  3        *       68 
ARIZONA
  VERDE RIVER BASIN ............................  5 of 10        *         *
  SAN FRANCISCO PEAKS ..........................  1 of  1       0*        7 
  CENTRAL MOGOLLON RIM .........................  3 of  4        *        5 
  LITTLE COLORADO - SOUTHERN HEADWATERS ........  5 of  6     100*        4 
  UPPER SALT RIVER BASIN / WHITE MOUNTAINS .....  6 of  9      33*         *
  SAN FRANCISCO / UPPER GILA RIVER BASIN .......  6 of  8      45*         *
  CHUSKA MOUNTAINS .............................  0 of  2        *         *
CALIFORNIA
  NORTHERN GREAT BASIN .........................  4 of  5     213*      146 
  TRUCKEE RIVER ................................  8 of  9     340*      169 
  LAKE TAHOE ...................................  8 of  8     212*      179 
  CARSON RIVER .................................  9 of  9     352*      135 
  WALKER RIVER .................................  7 of  7     319*      147 
  KLAMATH ...................................... 16 of 18     261*      119 
COLORADO
  GUNNISON RIVER BASIN ......................... 13 of 16      57        49 
  UPPER COLORADO RIVER BASIN ................... 27 of 31      82        87 
  SOUTH PLATTE RIVER BASIN ..................... 16 of 22     101       121 
  LARAMIE AND NORTH PLATTE RIVER BASINS ........ 12 of 12     104       115 
  YAMPA AND WHITE RIVER BASINS ................. 19 of 20      96        88 
  ARKANSAS RIVER BASIN .........................  7 of  9      73        70 
  UPPER RIO GRANDE BASIN ....................... 12 of 16      56        46 
  SAN MIGUEL, DOLORES, ANIMAS
     AND SAN JUAN RIVER BASIN .................. 17 of 19      39        25 
IDAHO
  NORTHERN PANHANDLE REGION .................... 10 of 10     168       115 
  SPOKANE RIVER BASIN ..........................  9 of 10     168       113 
  CLEARWATER BASIN ............................. 13 of 16     132       108 
  SALMON BASIN ................................. 22 of 22     172       117 
  WEISER BASIN .................................  4 of  4     158*      115 
  PAYETTE BASIN ................................ 11 of 11     190*      127 
  BOISE BASIN ..................................  9 of 10     149*      126 
  BIG WOOD BASIN ...............................  8 of  9     186*      129 
  LITTLE WOOD BASIN ............................  5 of  5     194       110 
  BIG LOST BASIN ...............................  5 of  5     200       111 
  LITTLE LOST, BIRCH BASINS ....................  4 of  4     136        87 
  MEDICINE LODGE, BEAVER, CAMAS BASINS .........  4 of  4     144        85 
  HENRYS FORK, TETON BASINS ....................  8 of  8     167       118 
  SNAKE BASIN ABOVE PALISADES .................. 17 of 18     195       136 
  WILLOW, BLACKFOOT, PORTNEUF BASINS ...........  5 of  6     138*      103 
  SNAKE BASIN ABOVE AMERICAN FALLS ............. 27 of 29     183       125 
  RAFT BASIN ...................................  1 of  2     114*       91 
  GOOSE CREEK BASIN ............................  2 of  2      70        91 
  SALMON FALLS BASIN ...........................  5 of  5     113       115 
  BRUNEAU BASIN ................................  5 of  5     139*      132 
  OWYHEE BASIN .................................  8 of  8     153*      132 
  BEAR RIVER BASIN ............................. 14 of 15     146        98 
MONTANA
  KOOTENAI RIVER BASIN .........................  8 of  8     147        98 
  FLATHEAD RIVER BASIN ......................... 12 of 16     155       106 
  UPPER CLARK FORK RIVER BASIN ................. 13 of 15     170       112 
  BITTERROOT RIVER BASIN .......................  7 of  7     142        97 
  LOWER CLARK FORK RIVER BASIN .................  8 of  8     155       108 
  JEFFERSON RIVER BASIN ........................ 19 of 19     175       102 
  MADISON RIVER BASIN .......................... 11 of 11     156       111 
  GALLATIN RIVER BASIN .........................  7 of  7     172       119 
  MISSOURI HEADWATERS .......................... 31 of 31     170       108 
  HEADWATERS MISSOURI MAINSTEM .................  5 of  5     182       129 
  SMITH, JUDITH, AND MUSSELSHELL RIVER BASINS ..  9 of 10     176       114 
  SUN, TETON AND MARIAS RIVER BASINS ...........  4 of  6     208*      112 
  MISSOURI MAINSTEM RIVER BASIN ................ 18 of 21     182       121 
  ST. MARY AND MILK RIVER BASINS ...............  3 of  3     141*      111 
  UPPER YELLOWSTONE RIVER BASIN ................ 23 of 24     222       142 
  WIND RIVER BASIN (WYOMING) ................... 11 of 13     185       141 
  SHOSHONE RIVER BASIN (WYOMING) ...............  5 of  6     229       164 
  BIGHORN RIVER BASIN (WYOMING) ................ 15 of 16     180       125 
  TONGUE RIVER BASIN (WYOMING) .................  6 of  7      86        64 
  POWDER RIVER BASIN (WYOMING) .................  6 of  7     142        95 
  LOWER YELLOWSTONE RIVER BASIN ................ 30 of 35     164       116 
NEVADA
  NORTHERN GREAT BASIN .........................  7 of  9     219*      149 
  SNAKE RIVER ..................................  7 of 10     117*      119 
  OWYHEE RIVER .................................  5 of  5     122*      137 
  UPPER HUMBOLDT RIVER .........................  9 of  9     106*      119 
  LOWER HUMBOLDT RIVER .........................  5 of  9     176*      124 
  CLOVER VALLEY & FRANKLIN RIVER ...............  4 of  6      98       110 
  EASTERN NEVADA BASINS ........................  4 of  4      18*       25 
NEW MEXICO
  RIO CHAMA RIVER BASIN ........................  4 of  4      48        47 
  UPPER RIO GRANDE BASIN .......................  9 of  9      52        39 
  SANGRE DE CRISTO MOUNTAIN RANGE BASINS .......  8 of 11      32        52 
  JEMEZ RIVER BASIN ............................  2 of  3       0*       19 
  SAN FRANCISCO RIVER BASIN ....................  2 of  3       0*         *
  GILA RIVER BASIN .............................  3 of  3      67*         *
  MIMBRES RIVER BASIN ..........................  2 of  2        *       14 
  PECOS RIVER BASIN ............................  1 of  1       0        43 
  SAN JUAN RIVER HEADWATERS ....................  5 of  5      46        27 
  ANIMAS RIVER BASIN ...........................  7 of  7      42        20 
  CIMARRON RIVER BASIN .........................  2 of  2      18        36 
  ZUNI/BLUEWATER RIVER BASIN ...................  1 of  1        *         *
  RIO HONDO BASIN ..............................  1 of  1       0*       51 
  CHUSKA MOUNTAINS .............................  0 of  1        *         *
OREGON
  OWYHEE .......................................  8 of  8     153*      132 
  MALHEUR ......................................  3 of  3     217*      144 
  GRANDE RONDE, POWDER, BURNT, IMNAHA .......... 16 of 17     133*      116 
  UMATILLA, WALLA WALLA, WILLOW ................  7 of  8     149*      124 
  JOHN DAY ..................................... 13 of 13     212*      123 
  UPPER DESCHUTES, CROOKED ..................... 14 of 14     238*      130 
  HOOD, SANDY, LOWER DESCHUTES .................  8 of  8     344*      138 
  COAST RANGE ..................................  0 of  2        *      157 
  WILLAMETTE ................................... 18 of 23     266*      139 
  ROGUE, UMPQUA ................................ 12 of 12     244*      118 
  KLAMATH ...................................... 16 of 18     261*      119 
  LAKE COUNTY, GOOSE LAKE ......................  9 of  9     269*      141 
  HARNEY .......................................  9 of  9     224*      137 
UTAH
  RAFT RIVER ...................................  1 of  2     114*       91 
  BEAR RIVER ................................... 17 of 24     147*       99 
  WEBER-OGDEN RIVERS ........................... 17 of 20     113*       69 
  PROVO R.-UTAH LAKE-JORDAN R. ................. 15 of 17      86*       54 
  TOOELE VALLEY-VERNON CREEK ...................  3 of  4      25        34 
  NORTHEASTERN UINTAHS .........................  6 of 10     105        65 
  DUCHESNE RIVER ............................... 12 of 13      95        60 
  PRICE-SAN RAFAEL .............................  6 of 11      54*       51 
  DIRTY DEVIL ..................................  3 of  6      30*       40 
  SOUTH EASTERN UTAH ...........................  3 of  6      13*       19 
  UPPER SEVIER RIVER ........................... 12 of 17      41*       22 
  SAN PITCH RIVER ..............................  5 of 11        *         *
  LOWER SEVIER RIVER ...........................  1 of  3        *         *
  BEAVER RIVER .................................  2 of  2      15        17 
  ESCALANTE RIVER ..............................  3 of  4      18        13 
  SOUTHWESTERN UTAH ............................ 10 of 13      46*        8 
WASHINGTON
  NORTHERN PANHANDLE ........................... 10 of 10     168       115 
  SPOKANE ......................................  9 of 10     168       113 
  UPPER COLUMBIA ...............................  5 of  6     176       125 
  CENTRAL COLUMBIA .............................  7 of  8     130       124 
  UPPER YAKIMA .................................  4 of  5     175*      114 
  LOWER YAKIMA .................................  7 of  9     251*      141 
  LOWER SNAKE .................................. 19 of 22     124       112 
  LOWER COLUMBIA ............................... 18 of 22     338*      135 
  SOUTH PUGET SOUND ............................  6 of 10     197*      128 
  CENTRAL PUGET SOUND ..........................  8 of  9     332*      110 
  NORTH PUGET SOUND ............................  8 of 12     187*      101 
  OLYMPIC ......................................  1 of  4        *      131 
WYOMING
  SNAKE RIVER .................................. 19 of 20     192       133 
  MADISON-GALLATIN .............................  5 of  5     168       120 
  YELLOWSTONE .................................. 13 of 13     225       149 
  WIND RIVER ................................... 10 of 12     180       139 
  BIGHORN BASIN ................................ 10 of 11     144        95 
  SHOSHONE RIVER ...............................  4 of  5     234       170 
  POWDER RIVER .................................  6 of  7     142        95 
  TONGUE RIVER .................................  6 of  7      86        64 
  BELLE FOURCHE ................................  1 of  1     160*       67 
  CHEYENNE RIVER BASIN .........................  2 of  2     104        69 
  UPPER N. PLATTE .............................. 16 of 18     103       104 
  SWEETWATER ...................................  3 of  3     141       104 
  LOWER N. PLATTE ..............................  4 of  4      77        68 
  LARAMIE RIVER ................................  6 of  6     133       133 
  S. PLATTE ....................................  2 of  3     149       146 
  LITTLE SNAKE RIVER ...........................  8 of  8      94        85 
  UPPER GREEN RIVER ............................ 12 of 13     172       128 
  LOWER GREEN RIVER ............................  7 of 11     112        78 
  UPPER BEAR RIVER .............................  7 of  9     122        86 
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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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