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: OCTOBER 22 , 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      80*       97 
  SUSITNA BASIN ................................  3 of  5      82*      123 
  NORTHERN KENAI MOUNTAINS .....................  7 of  7      79*       90 
  SOUTHERN KENAI ...............................  3 of  6        *       74 
  COPPER BASIN .................................  2 of  3     200*       93 
  PRINCE WILLIAM SOUND .........................  1 of  7        *       98 
  CHENA BASIN ..................................  5 of  7     169       231 
  UPPER TANANA .................................  2 of  5        *         *
  KOYUKUK BASIN ................................  2 of  6        *       79 
  CENTRAL YUKON BASIN ..........................  0 of  5        *      261 
  NORTON SOUND .................................  0 of  4        *      255 
  KUPARUK-SAGAVANIRKTOK RIVER BASIN ............  0 of  3        *      170 
  NORTHWEST ARCTIC RIVER BASIN .................  0 of  1        *         *
  SOUTHEAST ALASKA BASIN .......................  1 of  3        *       72 
ARIZONA
  VERDE RIVER BASIN ............................  5 of 10        *         *
  SAN FRANCISCO PEAKS ..........................  1 of  1        *        0 
  CENTRAL MOGOLLON RIM .........................  3 of  4        *        3 
  LITTLE COLORADO - SOUTHERN HEADWATERS ........  5 of  6        *        2 
  UPPER SALT RIVER BASIN / WHITE MOUNTAINS .....  6 of  9        *         *
  SAN FRANCISCO / UPPER GILA RIVER BASIN .......  6 of  8        *       13 
  CHUSKA MOUNTAINS .............................  0 of  2        *         *
CALIFORNIA
  NORTHERN GREAT BASIN .........................  3 of  5        *      116 
  TRUCKEE RIVER ................................  8 of  9        *       71 
  LAKE TAHOE ...................................  8 of  8        *       70 
  CARSON RIVER .................................  9 of  9        *       32 
  WALKER RIVER .................................  7 of  7        *       64 
  KLAMATH ...................................... 13 of 18        *      182 
COLORADO
  GUNNISON RIVER BASIN ......................... 10 of 16     208*       45 
  UPPER COLORADO RIVER BASIN ................... 24 of 31     229*      126 
  SOUTH PLATTE RIVER BASIN ..................... 16 of 22     146*      151 
  LARAMIE AND NORTH PLATTE RIVER BASINS ........ 11 of 12     176*      153 
  YAMPA AND WHITE RIVER BASINS ................. 18 of 20     239*      118 
  ARKANSAS RIVER BASIN .........................  6 of  9     224*       75 
  UPPER RIO GRANDE BASIN ....................... 10 of 16      27*       37 
  SAN MIGUEL, DOLORES, ANIMAS
     AND SAN JUAN RIVER BASIN .................. 15 of 19      33*       14 
IDAHO
  NORTHERN PANHANDLE REGION .................... 10 of 10    2067*      174 
  SPOKANE RIVER BASIN ..........................  9 of 10    2217*      174 
  CLEARWATER BASIN ............................. 15 of 16    3650*      176 
  SALMON BASIN ................................. 20 of 22     800*      131 
  WEISER BASIN .................................  4 of  4        *      181 
  PAYETTE BASIN ................................ 10 of 11        *      148 
  BOISE BASIN ..................................  8 of 10    2025*      137 
  BIG WOOD BASIN ...............................  8 of  9        *      114 
  LITTLE WOOD BASIN ............................  5 of  5     300*       98 
  BIG LOST BASIN ...............................  5 of  5     390*       78 
  LITTLE LOST, BIRCH BASINS ....................  3 of  4     600*       70 
  MEDICINE LODGE, BEAVER, CAMAS BASINS .........  3 of  4     500*       64 
  HENRYS FORK, TETON BASINS ....................  7 of  8     314*       82 
  SNAKE BASIN ABOVE PALISADES .................. 17 of 18     275*       71 
  WILLOW, BLACKFOOT, PORTNEUF BASINS ...........  6 of  6        *       54 
  SNAKE BASIN ABOVE AMERICAN FALLS ............. 27 of 29     274*       70 
  RAFT BASIN ...................................  1 of  2        *       73 
  GOOSE CREEK BASIN ............................  2 of  2        *      121 
  SALMON FALLS BASIN ...........................  5 of  5    1067*      133 
  BRUNEAU BASIN ................................  5 of  5     867*      131 
  OWYHEE BASIN .................................  8 of  8        *      139 
  BEAR RIVER BASIN ............................. 15 of 15     400*       41 
MONTANA
  KOOTENAI RIVER BASIN .........................  8 of  8     522*      129 
  FLATHEAD RIVER BASIN ......................... 11 of 16     330*      124 
  UPPER CLARK FORK RIVER BASIN ................. 11 of 15     314*      111 
  BITTERROOT RIVER BASIN .......................  7 of  7     700*      110 
  LOWER CLARK FORK RIVER BASIN .................  7 of  8    1038*      144 
  JEFFERSON RIVER BASIN ........................ 19 of 19     305*       76 
  MADISON RIVER BASIN .......................... 10 of 11     197*       70 
  GALLATIN RIVER BASIN .........................  7 of  7     172*       81 
  MISSOURI HEADWATERS .......................... 30 of 31     249*       75 
  HEADWATERS MISSOURI MAINSTEM .................  5 of  5     214*      112 
  SMITH, JUDITH, AND MUSSELSHELL RIVER BASINS ..  9 of 10     165*       84 
  SUN, TETON AND MARIAS RIVER BASINS ...........  4 of  6     300*      110 
  MISSOURI MAINSTEM RIVER BASIN ................ 18 of 21     186*      108 
  ST. MARY AND MILK RIVER BASINS ...............  3 of  3     300*      153 
  UPPER YELLOWSTONE RIVER BASIN ................ 23 of 24     203*       71 
  WIND RIVER BASIN (WYOMING) ...................  9 of 13     150*       83 
  SHOSHONE RIVER BASIN (WYOMING) ...............  5 of  6     238*       89 
  BIGHORN RIVER BASIN (WYOMING) ................ 15 of 16     160*       74 
  TONGUE RIVER BASIN (WYOMING) .................  6 of  7      36*       39 
  POWDER RIVER BASIN (WYOMING) .................  6 of  7      81*       72 
  LOWER YELLOWSTONE RIVER BASIN ................ 28 of 35     128*       68 
NEVADA
  NORTHERN GREAT BASIN .........................  6 of  9        *      115 
  SNAKE RIVER ..................................  7 of 10    1267*      128 
  OWYHEE RIVER .................................  5 of  5        *      159 
  UPPER HUMBOLDT RIVER .........................  8 of  9        *       96 
  LOWER HUMBOLDT RIVER .........................  5 of  9        *       90 
  CLOVER VALLEY & FRANKLIN RIVER ...............  3 of  6        *       58 
  EASTERN NEVADA BASINS ........................  4 of  4        *       28 
NEW MEXICO
  RIO CHAMA RIVER BASIN ........................  4 of  4        *       46 
  UPPER RIO GRANDE BASIN .......................  8 of  9      14*       27 
  SANGRE DE CRISTO MOUNTAIN RANGE BASINS .......  7 of 11        *       79 
  JEMEZ RIVER BASIN ............................  2 of  3        *       48 
  SAN FRANCISCO RIVER BASIN ....................  2 of  3        *       15 
  GILA RIVER BASIN .............................  3 of  3        *        3 
  MIMBRES RIVER BASIN ..........................  2 of  2        *       21 
  PECOS RIVER BASIN ............................  1 of  1        *       88 
  SAN JUAN RIVER HEADWATERS ....................  5 of  5      14*        7 
  ANIMAS RIVER BASIN ...........................  6 of  7      44*        8 
  CIMARRON RIVER BASIN .........................  0 of  2        *       47 
  ZUNI/BLUEWATER RIVER BASIN ...................  0 of  1        *        0 
  RIO HONDO BASIN ..............................  0 of  1        *       79 
  CHUSKA MOUNTAINS .............................  0 of  1        *         *
OREGON
  OWYHEE .......................................  8 of  8        *      139 
  MALHEUR ......................................  3 of  3        *      309 
  GRANDE RONDE, POWDER, BURNT, IMNAHA .......... 13 of 17    4567*      226 
  UMATILLA, WALLA WALLA, WILLOW ................  4 of  8        *      258 
  JOHN DAY ..................................... 11 of 13        *      257 
  UPPER DESCHUTES, CROOKED .....................  8 of 14        *      251 
  HOOD, SANDY, LOWER DESCHUTES .................  8 of  8        *      290 
  COAST RANGE ..................................  1 of  2        *         *
  WILLAMETTE ................................... 14 of 23        *      271 
  ROGUE, UMPQUA ................................  8 of 12        *      187 
  KLAMATH ...................................... 13 of 18        *      182 
  LAKE COUNTY, GOOSE LAKE ......................  8 of  9        *      128 
  HARNEY .......................................  8 of  9        *      243 
UTAH
  RAFT RIVER ...................................  1 of  2        *       73 
  BEAR RIVER ................................... 18 of 24     556*       40 
  WEBER-OGDEN RIVERS ........................... 16 of 20     686*       27 
  PROVO R.-UTAH LAKE-JORDAN R. ................. 13 of 17    1033*       32 
  TOOELE VALLEY-VERNON CREEK ...................  3 of  4        *       23 
  NORTHEASTERN UINTAHS .........................  6 of 10     314*       62 
  DUCHESNE RIVER ............................... 11 of 13     206*       26 
  PRICE-SAN RAFAEL .............................  6 of 11        *       34 
  DIRTY DEVIL ..................................  3 of  6        *       37 
  SOUTH EASTERN UTAH ...........................  3 of  6        *       20 
  UPPER SEVIER RIVER ........................... 11 of 17     188*       25 
  SAN PITCH RIVER ..............................  5 of 11        *         *
  LOWER SEVIER RIVER ...........................  1 of  3        *         *
  BEAVER RIVER .................................  2 of  2       0*       13 
  ESCALANTE RIVER ..............................  3 of  4        *       15 
  SOUTHWESTERN UTAH ............................  9 of 13     750*        5 
WASHINGTON
  NORTHERN PANHANDLE ........................... 10 of 10    2067*      174 
  SPOKANE ......................................  9 of 10    2217*      174 
  UPPER COLUMBIA ...............................  5 of  6    2500*      170 
  CENTRAL COLUMBIA .............................  4 of  8        *      255 
  UPPER YAKIMA .................................  4 of  5        *      229 
  LOWER YAKIMA .................................  6 of  9        *         *
  LOWER SNAKE .................................. 21 of 22    3373*      192 
  LOWER COLUMBIA ............................... 15 of 22        *      260 
  SOUTH PUGET SOUND ............................  6 of 10        *         *
  CENTRAL PUGET SOUND ..........................  9 of  9        *      201 
  NORTH PUGET SOUND ............................  7 of 12    3033*      167 
  OLYMPIC ......................................  2 of  4        *      165 
WYOMING
  SNAKE RIVER .................................. 18 of 20     246*       75 
  MADISON-GALLATIN .............................  4 of  5     111*       51 
  YELLOWSTONE .................................. 13 of 13     227*       70 
  WIND RIVER ...................................  8 of 12     148*       84 
  BIGHORN BASIN ................................ 10 of 11     119*       65 
  SHOSHONE RIVER ...............................  4 of  5     228*       91 
  POWDER RIVER .................................  6 of  7      81*       72 
  TONGUE RIVER .................................  6 of  7      36*       39 
  BELLE FOURCHE ................................  1 of  1        *       50 
  CHEYENNE RIVER BASIN .........................  2 of  2        *       59 
  UPPER N. PLATTE .............................. 15 of 18     125*      115 
  SWEETWATER ...................................  3 of  3       0*       34 
  LOWER N. PLATTE ..............................  4 of  4      73*       60 
  LARAMIE RIVER ................................  6 of  6     229*      151 
  S. PLATTE ....................................  2 of  3     242*      165 
  LITTLE SNAKE RIVER ...........................  8 of  8     161*      117 
  UPPER GREEN RIVER ............................ 10 of 13     118*       51 
  LOWER GREEN RIVER ............................  7 of 11     138*       48 
  UPPER BEAR RIVER .............................  7 of  9     550*       38 
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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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