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 WEDNESDAY: OCTOBER 18 , 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      23*      103 
  SUSITNA BASIN ................................  3 of  5     121*      135 
  NORTHERN KENAI MOUNTAINS .....................  7 of  7     120*      101 
  SOUTHERN KENAI ...............................  3 of  6        *       87 
  COPPER BASIN .................................  2 of  3     600*      102 
  PRINCE WILLIAM SOUND .........................  1 of  7        *      107 
  CHENA BASIN ..................................  5 of  7     204*      288 
  UPPER TANANA .................................  2 of  5        *         *
  KOYUKUK BASIN ................................  2 of  6        *      108 
  CENTRAL YUKON BASIN ..........................  0 of  5        *      380 
  NORTON SOUND .................................  0 of  4        *      331 
  KUPARUK-SAGAVANIRKTOK RIVER BASIN ............  0 of  3        *      178 
  NORTHWEST ARCTIC RIVER BASIN .................  0 of  1        *         *
  SOUTHEAST ALASKA BASIN .......................  1 of  3        *         *
ARIZONA
  VERDE RIVER BASIN ............................  5 of 10        *         *
  SAN FRANCISCO PEAKS ..........................  1 of  1        *        0 
  CENTRAL MOGOLLON RIM .........................  3 of  4        *        0 
  LITTLE COLORADO - SOUTHERN HEADWATERS ........  5 of  6        *         *
  UPPER SALT RIVER BASIN / WHITE MOUNTAINS .....  6 of  9        *        5 
  SAN FRANCISCO / UPPER GILA RIVER BASIN .......  6 of  8        *       14 
  CHUSKA MOUNTAINS .............................  0 of  2        *         *
CALIFORNIA
  NORTHERN GREAT BASIN .........................  3 of  5        *       10 
  TRUCKEE RIVER ................................  8 of  9        *       12 
  LAKE TAHOE ...................................  8 of  8        *       10 
  CARSON RIVER .................................  8 of  9        *        9 
  WALKER RIVER .................................  7 of  7        *       42 
  KLAMATH ...................................... 16 of 18        *       50 
COLORADO
  GUNNISON RIVER BASIN ......................... 11 of 16     200*       47 
  UPPER COLORADO RIVER BASIN ................... 25 of 31     316*      141 
  SOUTH PLATTE RIVER BASIN ..................... 17 of 22     240*      168 
  LARAMIE AND NORTH PLATTE RIVER BASINS ........ 11 of 12     295*      166 
  YAMPA AND WHITE RIVER BASINS ................. 18 of 20     568*      139 
  ARKANSAS RIVER BASIN .........................  7 of  9     223*       89 
  UPPER RIO GRANDE BASIN ....................... 11 of 16      25*       37 
  SAN MIGUEL, DOLORES, ANIMAS
     AND SAN JUAN RIVER BASIN .................. 16 of 19      50*       11 
IDAHO
  NORTHERN PANHANDLE REGION .................... 10 of 10    1150*       52 
  SPOKANE RIVER BASIN .......................... 10 of 10    3300*      119 
  CLEARWATER BASIN ............................. 15 of 16    4625*      143 
  SALMON BASIN ................................. 22 of 22     557*       91 
  WEISER BASIN .................................  4 of  4        *       92 
  PAYETTE BASIN ................................ 11 of 11        *       96 
  BOISE BASIN ..................................  8 of 10    1000*       95 
  BIG WOOD BASIN ...............................  7 of  9        *       88 
  LITTLE WOOD BASIN ............................  5 of  5     450*       86 
  BIG LOST BASIN ...............................  5 of  5     567*       79 
  LITTLE LOST, BIRCH BASINS ....................  4 of  4     400*       66 
  MEDICINE LODGE, BEAVER, CAMAS BASINS .........  4 of  4     300*       66 
  HENRYS FORK, TETON BASINS ....................  8 of  8     278*       73 
  SNAKE BASIN ABOVE PALISADES .................. 18 of 18     340*       74 
  WILLOW, BLACKFOOT, PORTNEUF BASINS ...........  6 of  6        *       59 
  SNAKE BASIN ABOVE AMERICAN FALLS ............. 29 of 29     312*       70 
  RAFT BASIN ...................................  1 of  2        *       78 
  GOOSE CREEK BASIN ............................  2 of  2        *       73 
  SALMON FALLS BASIN ...........................  5 of  5        *       90 
  BRUNEAU BASIN ................................  5 of  5        *       89 
  OWYHEE BASIN .................................  8 of  8        *       92 
  BEAR RIVER BASIN ............................. 14 of 15     480*       45 
MONTANA
  KOOTENAI RIVER BASIN .........................  8 of  8     325*       65 
  FLATHEAD RIVER BASIN ......................... 12 of 16     419*      116 
  UPPER CLARK FORK RIVER BASIN ................. 13 of 15     400*      124 
  BITTERROOT RIVER BASIN .......................  7 of  7     650*      108 
  LOWER CLARK FORK RIVER BASIN .................  8 of  8    2400*      119 
  JEFFERSON RIVER BASIN ........................ 18 of 19     345*       83 
  MADISON RIVER BASIN .......................... 11 of 11     249*       73 
  GALLATIN RIVER BASIN .........................  7 of  7     205*       75 
  MISSOURI HEADWATERS .......................... 30 of 31     282*       77 
  HEADWATERS MISSOURI MAINSTEM .................  4 of  5     350*      126 
  SMITH, JUDITH, AND MUSSELSHELL RIVER BASINS ..  9 of 10     288*      107 
  SUN, TETON AND MARIAS RIVER BASINS ...........  4 of  6     700*      126 
  MISSOURI MAINSTEM RIVER BASIN ................ 17 of 21     318*      128 
  ST. MARY AND MILK RIVER BASINS ...............  3 of  3     283*      144 
  UPPER YELLOWSTONE RIVER BASIN ................ 22 of 24     257*       73 
  WIND RIVER BASIN (WYOMING) ................... 11 of 13     292*      108 
  SHOSHONE RIVER BASIN (WYOMING) ...............  5 of  6     305*       89 
  BIGHORN RIVER BASIN (WYOMING) ................ 15 of 16     225*       88 
  TONGUE RIVER BASIN (WYOMING) .................  6 of  7      87*       62 
  POWDER RIVER BASIN (WYOMING) .................  6 of  7     195*       94 
  LOWER YELLOWSTONE RIVER BASIN ................ 30 of 35     214*       88 
NEVADA
  NORTHERN GREAT BASIN .........................  6 of  9        *       25 
  SNAKE RIVER ..................................  7 of 10        *       84 
  OWYHEE RIVER .................................  5 of  5        *      106 
  UPPER HUMBOLDT RIVER .........................  9 of  9        *       73 
  LOWER HUMBOLDT RIVER .........................  5 of  9        *       44 
  CLOVER VALLEY & FRANKLIN RIVER ...............  4 of  6        *       62 
  EASTERN NEVADA BASINS ........................  4 of  4        *       29 
NEW MEXICO
  RIO CHAMA RIVER BASIN ........................  4 of  4        *       60 
  UPPER RIO GRANDE BASIN .......................  8 of  9      21*       25 
  SANGRE DE CRISTO MOUNTAIN RANGE BASINS .......  8 of 11        *      104 
  JEMEZ RIVER BASIN ............................  2 of  3        *       63 
  SAN FRANCISCO RIVER BASIN ....................  2 of  3        *       24 
  GILA RIVER BASIN .............................  3 of  3        *       10 
  MIMBRES RIVER BASIN ..........................  2 of  2        *        8 
  PECOS RIVER BASIN ............................  1 of  1        *      114 
  SAN JUAN RIVER HEADWATERS ....................  5 of  5      21*        5 
  ANIMAS RIVER BASIN ...........................  7 of  7      80*         *
  CIMARRON RIVER BASIN .........................  1 of  2        *       67 
  ZUNI/BLUEWATER RIVER BASIN ...................  1 of  1        *       12 
  RIO HONDO BASIN ..............................  1 of  1        *       48 
  CHUSKA MOUNTAINS .............................  0 of  1        *         *
OREGON
  OWYHEE .......................................  8 of  8        *       92 
  MALHEUR ......................................  3 of  3        *      256 
  GRANDE RONDE, POWDER, BURNT, IMNAHA .......... 16 of 17        *      163 
  UMATILLA, WALLA WALLA, WILLOW ................  7 of  8        *      196 
  JOHN DAY ..................................... 13 of 13        *      174 
  UPPER DESCHUTES, CROOKED .....................  9 of 14        *      172 
  HOOD, SANDY, LOWER DESCHUTES .................  5 of  8        *      159 
  COAST RANGE ..................................  0 of  2        *       60 
  WILLAMETTE ................................... 13 of 23        *      168 
  ROGUE, UMPQUA ................................ 11 of 12        *       66 
  KLAMATH ...................................... 16 of 18        *       50 
  LAKE COUNTY, GOOSE LAKE ......................  8 of  9        *       15 
  HARNEY .......................................  8 of  9        *      156 
UTAH
  RAFT RIVER ...................................  1 of  2        *       78 
  BEAR RIVER ................................... 17 of 24     480*       43 
  WEBER-OGDEN RIVERS ........................... 17 of 20      60*       29 
  PROVO R.-UTAH LAKE-JORDAN R. ................. 15 of 17     150*       34 
  TOOELE VALLEY-VERNON CREEK ...................  3 of  4        *       39 
  NORTHEASTERN UINTAHS .........................  6 of 10     140*       71 
  DUCHESNE RIVER ............................... 12 of 13     120*       29 
  PRICE-SAN RAFAEL .............................  6 of 11        *       37 
  DIRTY DEVIL ..................................  3 of  6        *       31 
  SOUTH EASTERN UTAH ...........................  3 of  6        *       24 
  UPPER SEVIER RIVER ........................... 12 of 17     700*       22 
  SAN PITCH RIVER ..............................  5 of 11        *         *
  LOWER SEVIER RIVER ...........................  1 of  3        *         *
  BEAVER RIVER .................................  2 of  2       0*       17 
  ESCALANTE RIVER ..............................  3 of  4        *        9 
  SOUTHWESTERN UTAH ............................ 10 of 13        *        5 
WASHINGTON
  NORTHERN PANHANDLE ........................... 10 of 10    1150*       52 
  SPOKANE ...................................... 10 of 10    3300*      119 
  UPPER COLUMBIA ...............................  4 of  6        *       21 
  CENTRAL COLUMBIA .............................  6 of  8        *       75 
  UPPER YAKIMA .................................  4 of  5        *      110 
  LOWER YAKIMA .................................  7 of  9        *       99 
  LOWER SNAKE .................................. 21 of 22    5000*      147 
  LOWER COLUMBIA ............................... 15 of 22        *       99 
  SOUTH PUGET SOUND ............................  6 of 10        *      113 
  CENTRAL PUGET SOUND ..........................  9 of  9        *      112 
  NORTH PUGET SOUND ............................  7 of 12        *       77 
  OLYMPIC ......................................  3 of  4        *       40 
WYOMING
  SNAKE RIVER .................................. 20 of 20     286*       76 
  MADISON-GALLATIN .............................  5 of  5     185*       57 
  YELLOWSTONE .................................. 13 of 13     273*       74 
  WIND RIVER ................................... 10 of 12     300*      112 
  BIGHORN BASIN ................................ 10 of 11     183*       88 
  SHOSHONE RIVER ...............................  4 of  5     277*       92 
  POWDER RIVER .................................  6 of  7     195*       94 
  TONGUE RIVER .................................  6 of  7      87*       62 
  BELLE FOURCHE ................................  1 of  1        *       62 
  CHEYENNE RIVER BASIN .........................  2 of  2        *       81 
  UPPER N. PLATTE .............................. 14 of 18     224*      126 
  SWEETWATER ...................................  3 of  3      62*       61 
  LOWER N. PLATTE ..............................  4 of  4     450*       94 
  LARAMIE RIVER ................................  6 of  6     371*      179 
  S. PLATTE ....................................  2 of  3     311*      181 
  LITTLE SNAKE RIVER ...........................  7 of  8     200*      127 
  UPPER GREEN RIVER ............................ 12 of 13     273*       55 
  LOWER GREEN RIVER ............................  7 of 11     108*       59 
  UPPER BEAR RIVER .............................  7 of  9     100*       40 
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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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