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: DECEMBER 12 , 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      48        87 
  SUSITNA BASIN ................................  3 of  5     103       146 
  NORTHERN KENAI MOUNTAINS .....................  7 of  7      57        96 
  SOUTHERN KENAI ...............................  3 of  6      85        99 
  COPPER BASIN .................................  2 of  3     124       140 
  PRINCE WILLIAM SOUND .........................  1 of  7        *      108 
  CHENA BASIN ..................................  6 of  7     188       209 
  UPPER TANANA .................................  2 of  5        *         *
  KOYUKUK BASIN ................................  2 of  6        *      118 
  CENTRAL YUKON BASIN ..........................  0 of  5        *      188 
  NORTON SOUND .................................  0 of  4        *      191 
  KUPARUK-SAGAVANIRKTOK RIVER BASIN ............  0 of  3        *      152 
  NORTHWEST ARCTIC RIVER BASIN .................  0 of  1        *         *
  SOUTHEAST ALASKA BASIN .......................  1 of  3        *       81 
ARIZONA
  VERDE RIVER BASIN ............................  5 of 10       9*         *
  SAN FRANCISCO PEAKS ..........................  1 of  1      14          *
  CENTRAL MOGOLLON RIM .........................  3 of  4       7         3 
  LITTLE COLORADO - SOUTHERN HEADWATERS ........  5 of  6       6         3 
  UPPER SALT RIVER BASIN / WHITE MOUNTAINS .....  7 of  9       4         3 
  SAN FRANCISCO / UPPER GILA RIVER BASIN .......  7 of  8       7        11 
  CHUSKA MOUNTAINS .............................  0 of  2        *         *
CALIFORNIA
  NORTHERN GREAT BASIN .........................  4 of  5      62        86 
  TRUCKEE RIVER ................................  8 of  9      86       108 
  LAKE TAHOE ...................................  8 of  8      38       118 
  CARSON RIVER .................................  8 of  9      68        98 
  WALKER RIVER .................................  7 of  7      84       104 
  KLAMATH ...................................... 15 of 18      52        97 
COLORADO
  GUNNISON RIVER BASIN ......................... 12 of 16      41        39 
  UPPER COLORADO RIVER BASIN ................... 26 of 31      62        72 
  SOUTH PLATTE RIVER BASIN ..................... 17 of 22      76        96 
  LARAMIE AND NORTH PLATTE RIVER BASINS ........ 12 of 12      83        93 
  YAMPA AND WHITE RIVER BASINS ................. 19 of 20      70        72 
  ARKANSAS RIVER BASIN .........................  7 of  9      55        59 
  UPPER RIO GRANDE BASIN ....................... 12 of 16      35        35 
  SAN MIGUEL, DOLORES, ANIMAS
     AND SAN JUAN RIVER BASIN .................. 17 of 19      25        23 
IDAHO
  NORTHERN PANHANDLE REGION ....................  9 of 10      74       105 
  SPOKANE RIVER BASIN .......................... 10 of 10      66       101 
  CLEARWATER BASIN ............................. 14 of 16      69       102 
  SALMON BASIN ................................. 22 of 22     105       101 
  WEISER BASIN .................................  4 of  4      48        93 
  PAYETTE BASIN ................................ 11 of 11      82       102 
  BOISE BASIN ..................................  7 of 10      72       104 
  BIG WOOD BASIN ...............................  8 of  9      97       104 
  LITTLE WOOD BASIN ............................  5 of  5     105       105 
  BIG LOST BASIN ...............................  5 of  5     124       111 
  LITTLE LOST, BIRCH BASINS ....................  4 of  4     111        82 
  MEDICINE LODGE, BEAVER, CAMAS BASINS .........  4 of  4      98        79 
  HENRYS FORK, TETON BASINS ....................  8 of  8     109        97 
  SNAKE BASIN ABOVE PALISADES .................. 18 of 18     127       108 
  WILLOW, BLACKFOOT, PORTNEUF BASINS ...........  6 of  6      65        90 
  SNAKE BASIN ABOVE AMERICAN FALLS ............. 29 of 29     116       102 
  RAFT BASIN ...................................  1 of  2      75        80 
  GOOSE CREEK BASIN ............................  2 of  2      40        80 
  SALMON FALLS BASIN ...........................  5 of  5      58        96 
  BRUNEAU BASIN ................................  5 of  5      60       106 
  OWYHEE BASIN .................................  8 of  8      26       101 
  BEAR RIVER BASIN ............................. 15 of 15      86        80 
MONTANA
  KOOTENAI RIVER BASIN .........................  8 of  8      76        96 
  FLATHEAD RIVER BASIN ......................... 12 of 16      82       104 
  UPPER CLARK FORK RIVER BASIN ................. 13 of 15     115       106 
  BITTERROOT RIVER BASIN .......................  7 of  7      87        94 
  LOWER CLARK FORK RIVER BASIN .................  8 of  8      71       102 
  JEFFERSON RIVER BASIN ........................ 19 of 19     122        93 
  MADISON RIVER BASIN .......................... 11 of 11     115        97 
  GALLATIN RIVER BASIN .........................  7 of  7     126       110 
  MISSOURI HEADWATERS .......................... 31 of 31     118        97 
  HEADWATERS MISSOURI MAINSTEM .................  5 of  5     131       116 
  SMITH, JUDITH, AND MUSSELSHELL RIVER BASINS ..  9 of 10     124       105 
  SUN, TETON AND MARIAS RIVER BASINS ...........  4 of  6      51       106 
  MISSOURI MAINSTEM RIVER BASIN ................ 18 of 21     109       110 
  ST. MARY AND MILK RIVER BASINS ...............  3 of  3      60       115 
  UPPER YELLOWSTONE RIVER BASIN ................ 21 of 24     154       124 
  WIND RIVER BASIN (WYOMING) ................... 10 of 13     145       120 
  SHOSHONE RIVER BASIN (WYOMING) ...............  4 of  6     163       136 
  BIGHORN RIVER BASIN (WYOMING) ................ 14 of 16     144       111 
  TONGUE RIVER BASIN (WYOMING) .................  6 of  7      83        71 
  POWDER RIVER BASIN (WYOMING) .................  6 of  7     129        94 
  LOWER YELLOWSTONE RIVER BASIN ................ 29 of 35     133       107 
NEVADA
  NORTHERN GREAT BASIN .........................  7 of  9      53        97 
  SNAKE RIVER ..................................  7 of 10      53        97 
  OWYHEE RIVER .................................  5 of  5      27       104 
  UPPER HUMBOLDT RIVER .........................  9 of  9      32        92 
  LOWER HUMBOLDT RIVER .........................  5 of  9      36        98 
  CLOVER VALLEY & FRANKLIN RIVER ...............  4 of  6      33        89 
  EASTERN NEVADA BASINS ........................  4 of  4      35        37 
NEW MEXICO
  RIO CHAMA RIVER BASIN ........................  4 of  4      25        32 
  UPPER RIO GRANDE BASIN .......................  9 of  9      34        29 
  SANGRE DE CRISTO MOUNTAIN RANGE BASINS .......  8 of 11      20        45 
  JEMEZ RIVER BASIN ............................  2 of  3       2        14 
  SAN FRANCISCO RIVER BASIN ....................  3 of  3       8         7 
  GILA RIVER BASIN .............................  3 of  3      12        14 
  MIMBRES RIVER BASIN ..........................  1 of  2       0          *
  PECOS RIVER BASIN ............................  1 of  1       4        37 
  SAN JUAN RIVER HEADWATERS ....................  5 of  5      31        20 
  ANIMAS RIVER BASIN ...........................  7 of  7      26        23 
  CIMARRON RIVER BASIN .........................  2 of  2      26        38 
  ZUNI/BLUEWATER RIVER BASIN ...................  1 of  1       0          *
  RIO HONDO BASIN ..............................  1 of  1      14        34 
  CHUSKA MOUNTAINS .............................  0 of  1        *         *
OREGON
  OWYHEE .......................................  8 of  8      26       101 
  MALHEUR ......................................  2 of  3      46       102 
  GRANDE RONDE, POWDER, BURNT, IMNAHA .......... 16 of 17      42        95 
  UMATILLA, WALLA WALLA, WILLOW ................  7 of  8      42       103 
  JOHN DAY ..................................... 13 of 13      33        92 
  UPPER DESCHUTES, CROOKED ..................... 13 of 14      47        99 
  HOOD, SANDY, LOWER DESCHUTES .................  8 of  8      53       113 
  COAST RANGE ..................................  1 of  2        *      115 
  WILLAMETTE ................................... 18 of 23      47       107 
  ROGUE, UMPQUA ................................ 11 of 12      59        96 
  KLAMATH ...................................... 15 of 18      52        97 
  LAKE COUNTY, GOOSE LAKE ......................  9 of  9      59        98 
  HARNEY .......................................  8 of  9      40        91 
UTAH
  RAFT RIVER ...................................  1 of  2      75        80 
  BEAR RIVER ................................... 18 of 24      86        81 
  WEBER-OGDEN RIVERS ........................... 17 of 20      59        57 
  PROVO R.-UTAH LAKE-JORDAN R. ................. 14 of 17      44        46 
  TOOELE VALLEY-VERNON CREEK ...................  3 of  4       6        29 
  NORTHEASTERN UINTAHS .........................  6 of 10      74        56 
  DUCHESNE RIVER ............................... 12 of 13      58        49 
  PRICE-SAN RAFAEL .............................  6 of 11      13        42 
  DIRTY DEVIL ..................................  3 of  6       4        32 
  SOUTH EASTERN UTAH ...........................  3 of  6       4        15 
  UPPER SEVIER RIVER ........................... 12 of 17      16        18 
  SAN PITCH RIVER ..............................  5 of 11        *         *
  LOWER SEVIER RIVER ...........................  1 of  3        *         *
  BEAVER RIVER .................................  2 of  2       6        13 
  ESCALANTE RIVER ..............................  3 of  4      13         8 
  SOUTHWESTERN UTAH ............................ 10 of 13      13         9 
WASHINGTON
  NORTHERN PANHANDLE ...........................  9 of 10      74       105 
  SPOKANE ...................................... 10 of 10      66       101 
  UPPER COLUMBIA ...............................  5 of  6     108       102 
  CENTRAL COLUMBIA .............................  7 of  8      67       116 
  UPPER YAKIMA .................................  4 of  5      66       104 
  LOWER YAKIMA .................................  7 of  9      75       117 
  LOWER SNAKE .................................. 20 of 22      62       101 
  LOWER COLUMBIA ............................... 18 of 22      85       114 
  SOUTH PUGET SOUND ............................  6 of 10      75       118 
  CENTRAL PUGET SOUND ..........................  9 of  9      73       108 
  NORTH PUGET SOUND ............................  7 of 12     109       120 
  OLYMPIC ......................................  3 of  4     169       124 
WYOMING
  SNAKE RIVER .................................. 19 of 20     130       108 
  MADISON-GALLATIN .............................  4 of  5     105        98 
  YELLOWSTONE .................................. 12 of 13     161       128 
  WIND RIVER ................................... 10 of 12     145       120 
  BIGHORN BASIN ................................ 10 of 11     131        92 
  SHOSHONE RIVER ...............................  3 of  5     168       142 
  POWDER RIVER .................................  6 of  7     129        94 
  TONGUE RIVER .................................  6 of  7      83        71 
  BELLE FOURCHE ................................  1 of  1     118        82 
  CHEYENNE RIVER BASIN .........................  2 of  2     120        79 
  UPPER N. PLATTE .............................. 16 of 18      81        86 
  SWEETWATER ...................................  3 of  3      98        80 
  LOWER N. PLATTE ..............................  4 of  4      72        69 
  LARAMIE RIVER ................................  6 of  6      97       108 
  S. PLATTE ....................................  2 of  3      88       118 
  LITTLE SNAKE RIVER ...........................  8 of  8      71        74 
  UPPER GREEN RIVER ............................ 12 of 13     125       108 
  LOWER GREEN RIVER ............................  7 of 11      82        68 
  UPPER BEAR RIVER .............................  7 of  9      77        69 
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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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