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: SEPTEMBER 24 , 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        *       81 
  SUSITNA BASIN ................................  3 of  5        *       82 
  NORTHERN KENAI MOUNTAINS .....................  7 of  7        *       92 
  SOUTHERN KENAI ...............................  3 of  6        *       90 
  COPPER BASIN .................................  2 of  3        *       82 
  PRINCE WILLIAM SOUND .........................  1 of  7        *       81 
  CHENA BASIN ..................................  6 of  7        *       95 
  UPPER TANANA .................................  2 of  5        *         *
  KOYUKUK BASIN ................................  2 of  6        *      109 
  CENTRAL YUKON BASIN ..........................  0 of  5        *       89 
  NORTON SOUND .................................  0 of  4        *       94 
  KUPARUK-SAGAVANIRKTOK RIVER BASIN ............  0 of  3        *      128 
  NORTHWEST ARCTIC RIVER BASIN .................  0 of  1        *         *
  SOUTHEAST ALASKA BASIN .......................  1 of  3        *       98 
ARIZONA
  VERDE RIVER BASIN ............................  5 of 10        *      115 
  SAN FRANCISCO PEAKS ..........................  1 of  1        *      126 
  CENTRAL MOGOLLON RIM .........................  2 of  4        *      112 
  LITTLE COLORADO - SOUTHERN HEADWATERS ........  4 of  6        *      108 
  UPPER SALT RIVER BASIN / WHITE MOUNTAINS .....  6 of  9        *       94 
  SAN FRANCISCO / UPPER GILA RIVER BASIN .......  6 of  8        *       89 
  CHUSKA MOUNTAINS .............................  0 of  2        *         *
CALIFORNIA
  NORTHERN GREAT BASIN .........................  3 of  5        *      131 
  TRUCKEE RIVER ................................  8 of  9        *      197 
  LAKE TAHOE ...................................  8 of  8        *      211 
  CARSON RIVER .................................  8 of  9        *      197 
  WALKER RIVER .................................  7 of  7        *      204 
  KLAMATH ...................................... 16 of 18        *      131 
COLORADO
  GUNNISON RIVER BASIN ......................... 11 of 16        *      102 
  UPPER COLORADO RIVER BASIN ................... 24 of 31        *      101 
  SOUTH PLATTE RIVER BASIN ..................... 17 of 22        *      109 
  LARAMIE AND NORTH PLATTE RIVER BASINS ........ 10 of 12        *      107 
  YAMPA AND WHITE RIVER BASINS ................. 17 of 20        *       97 
  ARKANSAS RIVER BASIN .........................  7 of  9        *      111 
  UPPER RIO GRANDE BASIN ....................... 11 of 16        *      102 
  SAN MIGUEL, DOLORES, ANIMAS
     AND SAN JUAN RIVER BASIN .................. 16 of 19        *      101 
IDAHO
  NORTHERN PANHANDLE REGION .................... 10 of 10        *      124 
  SPOKANE RIVER BASIN .......................... 10 of 10        *      120 
  CLEARWATER BASIN ............................. 14 of 16        *      112 
  SALMON BASIN ................................. 21 of 22        *      131 
  WEISER BASIN .................................  4 of  4        *      126 
  PAYETTE BASIN ................................ 11 of 11        *      139 
  BOISE BASIN ..................................  9 of 10        *      150 
  BIG WOOD BASIN ...............................  8 of  9        *      158 
  LITTLE WOOD BASIN ............................  5 of  5        *      162 
  BIG LOST BASIN ...............................  5 of  5        *      160 
  LITTLE LOST, BIRCH BASINS ....................  4 of  4        *      137 
  MEDICINE LODGE, BEAVER, CAMAS BASINS .........  4 of  4        *      126 
  HENRYS FORK, TETON BASINS ....................  8 of  8        *      140 
  SNAKE BASIN ABOVE PALISADES .................. 17 of 18        *      147 
  WILLOW, BLACKFOOT, PORTNEUF BASINS ...........  6 of  6        *      144 
  SNAKE BASIN ABOVE AMERICAN FALLS ............. 28 of 29        *      144 
  RAFT BASIN ...................................  1 of  2        *      148 
  GOOSE CREEK BASIN ............................  2 of  2        *      130 
  SALMON FALLS BASIN ...........................  5 of  5        *      128 
  BRUNEAU BASIN ................................  5 of  5        *      130 
  OWYHEE BASIN .................................  8 of  8        *      130 
  BEAR RIVER BASIN ............................. 15 of 15        *      140 
MONTANA
  KOOTENAI RIVER BASIN .........................  8 of  8        *      116 
  FLATHEAD RIVER BASIN ......................... 12 of 16        *      112 
  UPPER CLARK FORK RIVER BASIN ................. 13 of 15        *      104 
  BITTERROOT RIVER BASIN .......................  7 of  7        *      108 
  LOWER CLARK FORK RIVER BASIN .................  8 of  8        *      116 
  JEFFERSON RIVER BASIN ........................ 19 of 19        *      108 
  MADISON RIVER BASIN .......................... 11 of 11        *      121 
  GALLATIN RIVER BASIN .........................  7 of  7        *      114 
  MISSOURI HEADWATERS .......................... 31 of 31        *      113 
  HEADWATERS MISSOURI MAINSTEM .................  5 of  5        *       97 
  SMITH, JUDITH, AND MUSSELSHELL RIVER BASINS ..  8 of 10        *       90 
  SUN, TETON AND MARIAS RIVER BASINS ...........  4 of  6        *      101 
  MISSOURI MAINSTEM RIVER BASIN ................ 17 of 21        *       93 
  ST. MARY AND MILK RIVER BASINS ...............  3 of  3        *      103 
  UPPER YELLOWSTONE RIVER BASIN ................ 22 of 24        *      127 
  WIND RIVER BASIN (WYOMING) ................... 11 of 13        *      152 
  SHOSHONE RIVER BASIN (WYOMING) ...............  5 of  6        *      155 
  BIGHORN RIVER BASIN (WYOMING) ................ 15 of 16        *      130 
  TONGUE RIVER BASIN (WYOMING) .................  6 of  7        *      114 
  POWDER RIVER BASIN (WYOMING) .................  6 of  7        *      109 
  LOWER YELLOWSTONE RIVER BASIN ................ 30 of 35        *      133 
NEVADA
  NORTHERN GREAT BASIN .........................  6 of  9        *      135 
  SNAKE RIVER ..................................  7 of 10        *      130 
  OWYHEE RIVER .................................  5 of  5        *      133 
  UPPER HUMBOLDT RIVER .........................  9 of  9        *      138 
  LOWER HUMBOLDT RIVER .........................  5 of  9        *      135 
  CLOVER VALLEY & FRANKLIN RIVER ...............  4 of  6        *      138 
  EASTERN NEVADA BASINS ........................  4 of  4        *      113 
NEW MEXICO
  RIO CHAMA RIVER BASIN ........................  4 of  4        *      121 
  UPPER RIO GRANDE BASIN .......................  9 of  9        *       98 
  SANGRE DE CRISTO MOUNTAIN RANGE BASINS .......  9 of 11        *       99 
  JEMEZ RIVER BASIN ............................  2 of  3        *       76 
  SAN FRANCISCO RIVER BASIN ....................  2 of  3        *       86 
  GILA RIVER BASIN .............................  3 of  3        *       94 
  MIMBRES RIVER BASIN ..........................  2 of  2        *       84 
  PECOS RIVER BASIN ............................  1 of  1        *       83 
  SAN JUAN RIVER HEADWATERS ....................  5 of  5        *       92 
  ANIMAS RIVER BASIN ...........................  7 of  7        *      102 
  CIMARRON RIVER BASIN .........................  2 of  2        *      102 
  ZUNI/BLUEWATER RIVER BASIN ...................  1 of  1        *      110 
  RIO HONDO BASIN ..............................  0 of  1        *       80 
  CHUSKA MOUNTAINS .............................  0 of  1        *         *
OREGON
  OWYHEE .......................................  8 of  8        *      130 
  MALHEUR ......................................  3 of  3        *      119 
  GRANDE RONDE, POWDER, BURNT, IMNAHA .......... 15 of 17        *      123 
  UMATILLA, WALLA WALLA, WILLOW ................  7 of  8        *      119 
  JOHN DAY ..................................... 12 of 13        *      115 
  UPPER DESCHUTES, CROOKED ..................... 13 of 14        *      125 
  HOOD, SANDY, LOWER DESCHUTES .................  7 of  8        *      120 
  COAST RANGE ..................................  1 of  2        *      136 
  WILLAMETTE ................................... 19 of 23        *      127 
  ROGUE, UMPQUA ................................ 11 of 12        *      134 
  KLAMATH ...................................... 16 of 18        *      131 
  LAKE COUNTY, GOOSE LAKE ......................  8 of  9        *      136 
  HARNEY .......................................  8 of  9        *      113 
UTAH
  RAFT RIVER ...................................  1 of  2        *      148 
  BEAR RIVER ................................... 18 of 24        *      143 
  WEBER-OGDEN RIVERS ........................... 16 of 20        *      126 
  PROVO R.-UTAH LAKE-JORDAN R. ................. 15 of 17        *      118 
  TOOELE VALLEY-VERNON CREEK ...................  3 of  4        *      113 
  NORTHEASTERN UINTAHS .........................  6 of 10        *      114 
  DUCHESNE RIVER ............................... 12 of 13        *      121 
  PRICE-SAN RAFAEL .............................  6 of 11        *      120 
  DIRTY DEVIL ..................................  3 of  6        *      116 
  SOUTH EASTERN UTAH ...........................  3 of  6        *       95 
  UPPER SEVIER RIVER ........................... 12 of 17        *      108 
  SAN PITCH RIVER ..............................  4 of 11        *         *
  LOWER SEVIER RIVER ...........................  1 of  3        *         *
  BEAVER RIVER .................................  2 of  2        *      117 
  ESCALANTE RIVER ..............................  3 of  4        *      101 
  SOUTHWESTERN UTAH ............................ 10 of 13        *      113 
WASHINGTON
  NORTHERN PANHANDLE ........................... 10 of 10        *      124 
  SPOKANE ...................................... 10 of 10        *      120 
  UPPER COLUMBIA ...............................  4 of  6        *      119 
  CENTRAL COLUMBIA .............................  6 of  8        *      114 
  UPPER YAKIMA .................................  3 of  5        *      101 
  LOWER YAKIMA .................................  5 of  9        *      125 
  LOWER SNAKE .................................. 20 of 22        *      115 
  LOWER COLUMBIA ............................... 15 of 22        *      130 
  SOUTH PUGET SOUND ............................  6 of 10        *      103 
  CENTRAL PUGET SOUND ..........................  8 of  9        *      105 
  NORTH PUGET SOUND ............................  7 of 12        *      112 
  OLYMPIC ......................................  3 of  4        *      131 
WYOMING
  SNAKE RIVER .................................. 19 of 20        *      145 
  MADISON-GALLATIN .............................  5 of  5        *      131 
  YELLOWSTONE .................................. 12 of 13        *      136 
  WIND RIVER ................................... 10 of 12        *      151 
  BIGHORN BASIN ................................ 10 of 11        *      112 
  SHOSHONE RIVER ...............................  4 of  5        *      156 
  POWDER RIVER .................................  6 of  7        *      109 
  TONGUE RIVER .................................  6 of  7        *      114 
  BELLE FOURCHE ................................  1 of  1        *       99 
  CHEYENNE RIVER BASIN .........................  2 of  2        *       92 
  UPPER N. PLATTE .............................. 12 of 18        *      104 
  SWEETWATER ...................................  3 of  3        *      150 
  LOWER N. PLATTE ..............................  4 of  4        *       98 
  LARAMIE RIVER ................................  5 of  6        *       99 
  S. PLATTE ....................................  1 of  3        *       99 
  LITTLE SNAKE RIVER ...........................  7 of  8        *      101 
  UPPER GREEN RIVER ............................ 12 of 13        *      150 
  LOWER GREEN RIVER ............................  6 of 11        *      131 
  UPPER BEAR RIVER .............................  7 of  9        *      134 
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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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