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 TUESDAY: NOVEMBER 21 , 2017
-----------------------------------------------------------------------------
STATE                                                      PERCENT OF Normal
  RIVER BASIN                                     Number   Snow Water  Accum
                                                 of Sites  Equivalent  Precip
-----------------------------------------------------------------------------
ALASKA
  ANCHORAGE/SHIP CREEK BASIN ...................  4 of  4      44        81 
  SUSITNA BASIN ................................  3 of  5     112       150 
  NORTHERN KENAI MOUNTAINS .....................  7 of  7      37        79 
  SOUTHERN KENAI ...............................  3 of  6      84*       80 
  COPPER BASIN .................................  2 of  3      30        93 
  PRINCE WILLIAM SOUND .........................  1 of  7        *       93 
  CHENA BASIN ..................................  6 of  7     209       213 
  UPPER TANANA .................................  2 of  5        *         *
  KOYUKUK BASIN ................................  2 of  6        *      126 
  CENTRAL YUKON BASIN ..........................  0 of  5        *      198 
  NORTON SOUND .................................  0 of  4        *      226 
  KUPARUK-SAGAVANIRKTOK RIVER BASIN ............  0 of  3        *      166 
  NORTHWEST ARCTIC RIVER BASIN .................  0 of  1        *         *
  SOUTHEAST ALASKA BASIN .......................  1 of  3        *       66 
ARIZONA
  VERDE RIVER BASIN ............................  5 of 10        *         *
  SAN FRANCISCO PEAKS ..........................  1 of  1      20*        9 
  CENTRAL MOGOLLON RIM .........................  3 of  4        *        6 
  LITTLE COLORADO - SOUTHERN HEADWATERS ........  5 of  6     125*        4 
  UPPER SALT RIVER BASIN / WHITE MOUNTAINS .....  6 of  9      31*         *
  SAN FRANCISCO / UPPER GILA RIVER BASIN .......  6 of  8      46*        7 
  CHUSKA MOUNTAINS .............................  0 of  2        *         *
CALIFORNIA
  NORTHERN GREAT BASIN .........................  4 of  5     206*      129 
  TRUCKEE RIVER ................................  8 of  9     302*      173 
  LAKE TAHOE ...................................  8 of  8     207*      183 
  CARSON RIVER .................................  9 of  9     333*      137 
  WALKER RIVER .................................  7 of  7     299*      148 
  KLAMATH ...................................... 16 of 18     246*      132 
COLORADO
  GUNNISON RIVER BASIN ......................... 13 of 16      58        50 
  UPPER COLORADO RIVER BASIN ................... 27 of 31      84        90 
  SOUTH PLATTE RIVER BASIN ..................... 16 of 22     101       119 
  LARAMIE AND NORTH PLATTE RIVER BASINS ........ 12 of 12     103       116 
  YAMPA AND WHITE RIVER BASINS ................. 19 of 20      97        92 
  ARKANSAS RIVER BASIN .........................  7 of  9      73        69 
  UPPER RIO GRANDE BASIN ....................... 12 of 16      58        47 
  SAN MIGUEL, DOLORES, ANIMAS
     AND SAN JUAN RIVER BASIN .................. 17 of 19      42        27 
IDAHO
  NORTHERN PANHANDLE REGION .................... 10 of 10     182       122 
  SPOKANE RIVER BASIN ..........................  9 of 10     188       122 
  CLEARWATER BASIN ............................. 13 of 16     153       119 
  SALMON BASIN ................................. 22 of 22     185       125 
  WEISER BASIN .................................  4 of  4     188*      123 
  PAYETTE BASIN ................................ 11 of 11     207       136 
  BOISE BASIN ..................................  9 of 10     160*      135 
  BIG WOOD BASIN ...............................  8 of  9     203       140 
  LITTLE WOOD BASIN ............................  5 of  5     209       134 
  BIG LOST BASIN ...............................  5 of  5     209       134 
  LITTLE LOST, BIRCH BASINS ....................  4 of  4     143        89 
  MEDICINE LODGE, BEAVER, CAMAS BASINS .........  4 of  4     153        86 
  HENRYS FORK, TETON BASINS ....................  8 of  8     174       125 
  SNAKE BASIN ABOVE PALISADES .................. 17 of 18     201       142 
  WILLOW, BLACKFOOT, PORTNEUF BASINS ...........  6 of  6     152       110 
  SNAKE BASIN ABOVE AMERICAN FALLS ............. 28 of 29     190       131 
  RAFT BASIN ...................................  1 of  2     123*       94 
  GOOSE CREEK BASIN ............................  2 of  2      91       101 
  SALMON FALLS BASIN ...........................  5 of  5     125       122 
  BRUNEAU BASIN ................................  5 of  5     156*      140 
  OWYHEE BASIN .................................  8 of  8     191*      141 
  BEAR RIVER BASIN ............................. 15 of 15     152       104 
MONTANA
  KOOTENAI RIVER BASIN .........................  8 of  8     158       108 
  FLATHEAD RIVER BASIN ......................... 12 of 16     168       118 
  UPPER CLARK FORK RIVER BASIN ................. 13 of 15     187       120 
  BITTERROOT RIVER BASIN .......................  7 of  7     161       105 
  LOWER CLARK FORK RIVER BASIN .................  8 of  8     178       117 
  JEFFERSON RIVER BASIN ........................ 19 of 19     183       105 
  MADISON RIVER BASIN ..........................  9 of 11     163       114 
  GALLATIN RIVER BASIN .........................  6 of  7     184       123 
  MISSOURI HEADWATERS .......................... 29 of 31     178       111 
  HEADWATERS MISSOURI MAINSTEM .................  5 of  5     190       135 
  SMITH, JUDITH, AND MUSSELSHELL RIVER BASINS ..  9 of 10     186       117 
  SUN, TETON AND MARIAS RIVER BASINS ...........  4 of  6     212*      111 
  MISSOURI MAINSTEM RIVER BASIN ................ 18 of 21     191       123 
  ST. MARY AND MILK RIVER BASINS ...............  3 of  3     147       114 
  UPPER YELLOWSTONE RIVER BASIN ................ 22 of 24     229       147 
  WIND RIVER BASIN (WYOMING) ................... 10 of 13     182       141 
  SHOSHONE RIVER BASIN (WYOMING) ...............  4 of  6     232       170 
  BIGHORN RIVER BASIN (WYOMING) ................ 14 of 16     181       126 
  TONGUE RIVER BASIN (WYOMING) .................  6 of  7      86        65 
  POWDER RIVER BASIN (WYOMING) .................  6 of  7     146        96 
  LOWER YELLOWSTONE RIVER BASIN ................ 29 of 35     164       117 
NEVADA
  NORTHERN GREAT BASIN .........................  7 of  9     218*      142 
  SNAKE RIVER ..................................  7 of 10     135*      128 
  OWYHEE RIVER .................................  5 of  5     174*      144 
  UPPER HUMBOLDT RIVER .........................  9 of  9     125*      125 
  LOWER HUMBOLDT RIVER .........................  5 of  9     180*      129 
  CLOVER VALLEY & FRANKLIN RIVER ...............  4 of  6     105       115 
  EASTERN NEVADA BASINS ........................  4 of  4      24        32 
NEW MEXICO
  RIO CHAMA RIVER BASIN ........................  4 of  4      48        46 
  UPPER RIO GRANDE BASIN .......................  9 of  9      54        39 
  SANGRE DE CRISTO MOUNTAIN RANGE BASINS .......  8 of 11      34        52 
  JEMEZ RIVER BASIN ............................  3 of  3       0*       20 
  SAN FRANCISCO RIVER BASIN ....................  2 of  3      25*        5 
  GILA RIVER BASIN .............................  3 of  3      50*        7 
  MIMBRES RIVER BASIN ..........................  2 of  2        *       14 
  PECOS RIVER BASIN ............................  1 of  1       5        42 
  SAN JUAN RIVER HEADWATERS ....................  5 of  5      45        27 
  ANIMAS RIVER BASIN ...........................  7 of  7      46        22 
  CIMARRON RIVER BASIN .........................  2 of  2      22        35 
  ZUNI/BLUEWATER RIVER BASIN ...................  1 of  1        *        8 
  RIO HONDO BASIN ..............................  1 of  1      67*       54 
  CHUSKA MOUNTAINS .............................  0 of  1        *         *
OREGON
  OWYHEE .......................................  8 of  8     191*      141 
  MALHEUR ......................................  3 of  3     267*      149 
  GRANDE RONDE, POWDER, BURNT, IMNAHA .......... 16 of 17     134*      120 
  UMATILLA, WALLA WALLA, WILLOW ................  7 of  8     131*      129 
  JOHN DAY ..................................... 13 of 13     199*      126 
  UPPER DESCHUTES, CROOKED ..................... 14 of 14     203*      138 
  HOOD, SANDY, LOWER DESCHUTES .................  8 of  8     272*      145 
  COAST RANGE ..................................  0 of  2        *      167 
  WILLAMETTE ................................... 18 of 23     212*      145 
  ROGUE, UMPQUA ................................ 12 of 12     214*      128 
  KLAMATH ...................................... 16 of 18     246*      132 
  LAKE COUNTY, GOOSE LAKE ......................  9 of  9     267*      141 
  HARNEY .......................................  9 of  9     254*      129 
UTAH
  RAFT RIVER ...................................  1 of  2     123*       94 
  BEAR RIVER ................................... 18 of 24     152       104 
  WEBER-OGDEN RIVERS ........................... 17 of 20     111        69 
  PROVO R.-UTAH LAKE-JORDAN R. ................. 15 of 17      88*       54 
  TOOELE VALLEY-VERNON CREEK ...................  3 of  4      34        35 
  NORTHEASTERN UINTAHS .........................  6 of 10     101        65 
  DUCHESNE RIVER ............................... 12 of 13      97        61 
  PRICE-SAN RAFAEL .............................  6 of 11      60*       50 
  DIRTY DEVIL ..................................  3 of  6      42*       40 
  SOUTH EASTERN UTAH ...........................  3 of  6      26*       21 
  UPPER SEVIER RIVER ........................... 12 of 17      42*       22 
  SAN PITCH RIVER ..............................  5 of 11        *         *
  LOWER SEVIER RIVER ...........................  1 of  3        *         *
  BEAVER RIVER .................................  2 of  2      16        17 
  ESCALANTE RIVER ..............................  3 of  4      20        13 
  SOUTHWESTERN UTAH ............................ 10 of 13      47*        7 
WASHINGTON
  NORTHERN PANHANDLE ........................... 10 of 10     182       122 
  SPOKANE ......................................  9 of 10     188       122 
  UPPER COLUMBIA ...............................  5 of  6     179       130 
  CENTRAL COLUMBIA .............................  7 of  8     132       128 
  UPPER YAKIMA .................................  4 of  5     164*      119 
  LOWER YAKIMA .................................  7 of  9     240*      145 
  LOWER SNAKE .................................. 19 of 22     141       120 
  LOWER COLUMBIA ............................... 18 of 22     291*      140 
  SOUTH PUGET SOUND ............................  6 of 10     169*      132 
  CENTRAL PUGET SOUND ..........................  8 of  9     281*      114 
  NORTH PUGET SOUND ............................  8 of 12     181*      102 
  OLYMPIC ......................................  2 of  4     655*      131 
WYOMING
  SNAKE RIVER .................................. 18 of 20     196       138 
  MADISON-GALLATIN .............................  4 of  5     176       124 
  YELLOWSTONE .................................. 13 of 13     231       155 
  WIND RIVER ................................... 10 of 12     182       141 
  BIGHORN BASIN ................................ 10 of 11     149        98 
  SHOSHONE RIVER ...............................  3 of  5     238       178 
  POWDER RIVER .................................  6 of  7     146        96 
  TONGUE RIVER .................................  6 of  7      86        65 
  BELLE FOURCHE ................................  1 of  1     117        65 
  CHEYENNE RIVER BASIN .........................  2 of  2     113        71 
  UPPER N. PLATTE .............................. 16 of 18     102       105 
  SWEETWATER ...................................  3 of  3     140       103 
  LOWER N. PLATTE ..............................  4 of  4      78        71 
  LARAMIE RIVER ................................  6 of  6     130       132 
  S. PLATTE ....................................  2 of  3     142       142 
  LITTLE SNAKE RIVER ...........................  8 of  8      95        90 
  UPPER GREEN RIVER ............................ 12 of 13     182       138 
  LOWER GREEN RIVER ............................  7 of 11     117        84 
  UPPER BEAR RIVER .............................  7 of  9     125        87 
-----------------------------------------------------------------------------


   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.        
                   

..back to SNOTEL page

..back to WRCC Home page

Western Regional Climate Center