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: DECEMBER 17 , 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      50        92 
  SUSITNA BASIN ................................  3 of  5     103       147 
  NORTHERN KENAI MOUNTAINS .....................  7 of  7      56       101 
  SOUTHERN KENAI ...............................  3 of  6      91       109 
  COPPER BASIN .................................  2 of  3     136       144 
  PRINCE WILLIAM SOUND .........................  1 of  7        *      115 
  CHENA BASIN ..................................  6 of  7     180       207 
  UPPER TANANA .................................  2 of  5        *         *
  KOYUKUK BASIN ................................  2 of  6        *      134 
  CENTRAL YUKON BASIN ..........................  0 of  5        *      182 
  NORTON SOUND .................................  0 of  4        *      188 
  KUPARUK-SAGAVANIRKTOK RIVER BASIN ............  0 of  3        *      139 
  NORTHWEST ARCTIC RIVER BASIN .................  0 of  1        *         *
  SOUTHEAST ALASKA BASIN .......................  1 of  3        *       90 
ARIZONA
  VERDE RIVER BASIN ............................  5 of 10       5          *
  SAN FRANCISCO PEAKS ..........................  1 of  1      18          *
  CENTRAL MOGOLLON RIM .........................  3 of  4       5         3 
  LITTLE COLORADO - SOUTHERN HEADWATERS ........  5 of  6       5         3 
  UPPER SALT RIVER BASIN / WHITE MOUNTAINS .....  7 of  9       6         3 
  SAN FRANCISCO / UPPER GILA RIVER BASIN .......  7 of  8       8         9 
  CHUSKA MOUNTAINS .............................  0 of  2        *         *
CALIFORNIA
  NORTHERN GREAT BASIN .........................  4 of  5      58        76 
  TRUCKEE RIVER ................................  8 of  9      72        97 
  LAKE TAHOE ...................................  8 of  8      36       107 
  CARSON RIVER .................................  9 of  9      58        88 
  WALKER RIVER .................................  7 of  7      66        92 
  KLAMATH ...................................... 15 of 18      42        85 
COLORADO
  GUNNISON RIVER BASIN ......................... 12 of 16      38        45 
  UPPER COLORADO RIVER BASIN ................... 24 of 31      61        70 
  SOUTH PLATTE RIVER BASIN ..................... 16 of 22      74        93 
  LARAMIE AND NORTH PLATTE RIVER BASINS ........ 11 of 12      77        88 
  YAMPA AND WHITE RIVER BASINS ................. 19 of 20      63        66 
  ARKANSAS RIVER BASIN .........................  7 of  9      52        59 
  UPPER RIO GRANDE BASIN ....................... 12 of 16      32        35 
  SAN MIGUEL, DOLORES, ANIMAS
     AND SAN JUAN RIVER BASIN .................. 15 of 19      24        22 
IDAHO
  NORTHERN PANHANDLE REGION .................... 10 of 10      70        97 
  SPOKANE RIVER BASIN ..........................  9 of 10      63        96 
  CLEARWATER BASIN ............................. 14 of 16      67        95 
  SALMON BASIN ................................. 22 of 22      95        91 
  WEISER BASIN .................................  4 of  4      44        82 
  PAYETTE BASIN ................................ 11 of 11      72        91 
  BOISE BASIN ..................................  9 of 10      61        89 
  BIG WOOD BASIN ...............................  8 of  9      84        93 
  LITTLE WOOD BASIN ............................  5 of  5      90        94 
  BIG LOST BASIN ...............................  5 of  5     114       100 
  LITTLE LOST, BIRCH BASINS ....................  4 of  4     103        75 
  MEDICINE LODGE, BEAVER, CAMAS BASINS .........  4 of  4      88        73 
  HENRYS FORK, TETON BASINS ....................  8 of  8     100        90 
  SNAKE BASIN ABOVE PALISADES .................. 18 of 18     119       102 
  WILLOW, BLACKFOOT, PORTNEUF BASINS ...........  6 of  6      62        86 
  SNAKE BASIN ABOVE AMERICAN FALLS ............. 29 of 29     108        96 
  RAFT BASIN ...................................  1 of  2      56        72 
  GOOSE CREEK BASIN ............................  2 of  2      38        77 
  SALMON FALLS BASIN ...........................  5 of  5      55        90 
  BRUNEAU BASIN ................................  5 of  5      58        98 
  OWYHEE BASIN .................................  8 of  8      23        93 
  BEAR RIVER BASIN ............................. 15 of 15      78        76 
MONTANA
  KOOTENAI RIVER BASIN .........................  8 of  8      70        90 
  FLATHEAD RIVER BASIN ......................... 11 of 16      79        99 
  UPPER CLARK FORK RIVER BASIN ................. 13 of 15     110        98 
  BITTERROOT RIVER BASIN .......................  7 of  7      82        88 
  LOWER CLARK FORK RIVER BASIN .................  8 of  8      68        95 
  JEFFERSON RIVER BASIN ........................ 19 of 19     116        87 
  MADISON RIVER BASIN .......................... 11 of 11     111        92 
  GALLATIN RIVER BASIN .........................  7 of  7     121       107 
  MISSOURI HEADWATERS .......................... 31 of 31     113        92 
  HEADWATERS MISSOURI MAINSTEM .................  5 of  5     130       111 
  SMITH, JUDITH, AND MUSSELSHELL RIVER BASINS ..  9 of 10     120       101 
  SUN, TETON AND MARIAS RIVER BASINS ...........  4 of  6      44        96 
  MISSOURI MAINSTEM RIVER BASIN ................ 18 of 21     104       103 
  ST. MARY AND MILK RIVER BASINS ...............  3 of  3      51       108 
  UPPER YELLOWSTONE RIVER BASIN ................ 22 of 24     147       120 
  WIND RIVER BASIN (WYOMING) ................... 10 of 13     144       116 
  SHOSHONE RIVER BASIN (WYOMING) ...............  4 of  6     154       130 
  BIGHORN RIVER BASIN (WYOMING) ................ 14 of 16     142       108 
  TONGUE RIVER BASIN (WYOMING) .................  6 of  7      89        70 
  POWDER RIVER BASIN (WYOMING) .................  6 of  7     126        91 
  LOWER YELLOWSTONE RIVER BASIN ................ 29 of 35     132       103 
NEVADA
  NORTHERN GREAT BASIN .........................  7 of  9      49        86 
  SNAKE RIVER ..................................  7 of 10      51        91 
  OWYHEE RIVER .................................  5 of  5      24        96 
  UPPER HUMBOLDT RIVER .........................  9 of  9      35        84 
  LOWER HUMBOLDT RIVER .........................  5 of  9      30        86 
  CLOVER VALLEY & FRANKLIN RIVER ...............  4 of  6      36        80 
  EASTERN NEVADA BASINS ........................  4 of  4      31        30 
NEW MEXICO
  RIO CHAMA RIVER BASIN ........................  4 of  4      21        31 
  UPPER RIO GRANDE BASIN .......................  9 of  9      31        29 
  SANGRE DE CRISTO MOUNTAIN RANGE BASINS .......  8 of 11      17        43 
  JEMEZ RIVER BASIN ............................  2 of  3       2          *
  SAN FRANCISCO RIVER BASIN ....................  3 of  3       4         6 
  GILA RIVER BASIN .............................  3 of  3       8        10 
  MIMBRES RIVER BASIN ..........................  1 of  2       0          *
  PECOS RIVER BASIN ............................  1 of  1       4        35 
  SAN JUAN RIVER HEADWATERS ....................  5 of  5      28        21 
  ANIMAS RIVER BASIN ...........................  7 of  7      22        21 
  CIMARRON RIVER BASIN .........................  2 of  2      21        37 
  ZUNI/BLUEWATER RIVER BASIN ...................  1 of  1       7         2 
  RIO HONDO BASIN ..............................  0 of  1        *       35 
  CHUSKA MOUNTAINS .............................  0 of  1        *         *
OREGON
  OWYHEE .......................................  8 of  8      23        93 
  MALHEUR ......................................  3 of  3      36        93 
  GRANDE RONDE, POWDER, BURNT, IMNAHA .......... 15 of 17      44        88 
  UMATILLA, WALLA WALLA, WILLOW ................  7 of  8      45        97 
  JOHN DAY ..................................... 13 of 13      31        85 
  UPPER DESCHUTES, CROOKED ..................... 13 of 14      43        91 
  HOOD, SANDY, LOWER DESCHUTES .................  7 of  8      43       102 
  COAST RANGE ..................................  1 of  2        *      104 
  WILLAMETTE ................................... 18 of 23      42        98 
  ROGUE, UMPQUA ................................ 11 of 12      50        85 
  KLAMATH ...................................... 15 of 18      42        85 
  LAKE COUNTY, GOOSE LAKE ......................  9 of  9      47        87 
  HARNEY .......................................  9 of  9      37        83 
UTAH
  RAFT RIVER ...................................  1 of  2      56        72 
  BEAR RIVER ................................... 18 of 24      77        76 
  WEBER-OGDEN RIVERS ........................... 17 of 20      53        54 
  PROVO R.-UTAH LAKE-JORDAN R. ................. 14 of 17      39        43 
  TOOELE VALLEY-VERNON CREEK ...................  3 of  4      10        30 
  NORTHEASTERN UINTAHS .........................  6 of 10      75        58 
  DUCHESNE RIVER ............................... 12 of 13      54        47 
  PRICE-SAN RAFAEL .............................  6 of 11      11        38 
  DIRTY DEVIL ..................................  3 of  6       4        30 
  SOUTH EASTERN UTAH ...........................  3 of  6       6        15 
  UPPER SEVIER RIVER ........................... 12 of 17      13        17 
  SAN PITCH RIVER ..............................  5 of 11        *         *
  LOWER SEVIER RIVER ...........................  1 of  3        *         *
  BEAVER RIVER .................................  2 of  2       3        12 
  ESCALANTE RIVER ..............................  3 of  4      10         9 
  SOUTHWESTERN UTAH ............................ 10 of 13       9         7 
WASHINGTON
  NORTHERN PANHANDLE ........................... 10 of 10      70        97 
  SPOKANE ......................................  9 of 10      63        96 
  UPPER COLUMBIA ...............................  5 of  6     102        93 
  CENTRAL COLUMBIA .............................  7 of  8      61       107 
  UPPER YAKIMA .................................  4 of  5      63        96 
  LOWER YAKIMA .................................  6 of  9      74       108 
  LOWER SNAKE .................................. 20 of 22      60        94 
  LOWER COLUMBIA ............................... 17 of 22      77       105 
  SOUTH PUGET SOUND ............................  6 of 10      70       110 
  CENTRAL PUGET SOUND ..........................  9 of  9      71       100 
  NORTH PUGET SOUND ............................  7 of 12     102       111 
  OLYMPIC ......................................  3 of  4     142       110 
WYOMING
  SNAKE RIVER .................................. 19 of 20     121       101 
  MADISON-GALLATIN .............................  5 of  5     102        93 
  YELLOWSTONE .................................. 13 of 13     152       123 
  WIND RIVER ................................... 10 of 12     144       116 
  BIGHORN BASIN ................................ 10 of 11     133        91 
  SHOSHONE RIVER ...............................  3 of  5     158       135 
  POWDER RIVER .................................  6 of  7     126        91 
  TONGUE RIVER .................................  6 of  7      89        70 
  BELLE FOURCHE ................................  1 of  1     160        83 
  CHEYENNE RIVER BASIN .........................  2 of  2     122        83 
  UPPER N. PLATTE .............................. 15 of 18      75        81 
  SWEETWATER ...................................  3 of  3      99        75 
  LOWER N. PLATTE ..............................  4 of  4      74        68 
  LARAMIE RIVER ................................  6 of  6      92       105 
  S. PLATTE ....................................  2 of  3      86       118 
  LITTLE SNAKE RIVER ...........................  8 of  8      64        69 
  UPPER GREEN RIVER ............................ 12 of 13     117       101 
  LOWER GREEN RIVER ............................  7 of 11      79        67 
  UPPER BEAR RIVER .............................  7 of  9      71        67 
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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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