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 FRIDAY: FEBRUARY 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      66        68 
  SUSITNA BASIN ................................  3 of  5      88        59 
  NORTHERN KENAI MOUNTAINS .....................  7 of  7      78        80 
  SOUTHERN KENAI ...............................  3 of  6      92        81 
  COPPER BASIN .................................  2 of  3      92        65 
  PRINCE WILLIAM SOUND .........................  1 of  7        *       75 
  CHENA BASIN ..................................  5 of  7     117        91 
  UPPER TANANA .................................  2 of  5        *         *
  KOYUKUK BASIN ................................  2 of  6        *       39 
  CENTRAL YUKON BASIN ..........................  0 of  5        *       88 
  NORTON SOUND .................................  0 of  4        *       69 
  KUPARUK-SAGAVANIRKTOK RIVER BASIN ............  0 of  3        *       91 
  NORTHWEST ARCTIC RIVER BASIN .................  0 of  1        *         *
  SOUTHEAST ALASKA BASIN .......................  1 of  3        *       89 
ARIZONA
  VERDE RIVER BASIN ............................  5 of 10      85       142 
  SAN FRANCISCO PEAKS ..........................  1 of  1     210       158 
  CENTRAL MOGOLLON RIM .........................  3 of  4      87       142 
  LITTLE COLORADO - SOUTHERN HEADWATERS ........  5 of  6      94       140 
  UPPER SALT RIVER BASIN / WHITE MOUNTAINS .....  7 of  9      62       128 
  SAN FRANCISCO / UPPER GILA RIVER BASIN .......  7 of  8      54       128 
  CHUSKA MOUNTAINS .............................  0 of  2        *         *
CALIFORNIA
  NORTHERN GREAT BASIN .........................  3 of  5     149       145 
  TRUCKEE RIVER ................................  7 of  9     210          *
  LAKE TAHOE ...................................  8 of  8     228          *
  CARSON RIVER .................................  9 of  9     224          *
  WALKER RIVER .................................  7 of  7     226          *
  KLAMATH ...................................... 16 of 18     123       135 
COLORADO
  GUNNISON RIVER BASIN ......................... 13 of 16     151       123 
  UPPER COLORADO RIVER BASIN ................... 27 of 31     138       120 
  SOUTH PLATTE RIVER BASIN ..................... 16 of 22     133       129 
  LARAMIE AND NORTH PLATTE RIVER BASINS ........ 12 of 12     125       127 
  YAMPA AND WHITE RIVER BASINS ................. 18 of 20     120       115 
  ARKANSAS RIVER BASIN .........................  7 of  9     136       111 
  UPPER RIO GRANDE BASIN ....................... 11 of 16     141       105 
  SAN MIGUEL, DOLORES, ANIMAS
     AND SAN JUAN RIVER BASIN .................. 16 of 19     151       127 
IDAHO
  NORTHERN PANHANDLE REGION .................... 10 of 10      86       133 
  SPOKANE RIVER BASIN .......................... 10 of 10      89       118 
  CLEARWATER BASIN ............................. 14 of 16      96       108 
  SALMON BASIN ................................. 22 of 22     131       121 
  WEISER BASIN .................................  4 of  4     108       119 
  PAYETTE BASIN ................................ 11 of 11     125       129 
  BOISE BASIN ..................................  8 of 10     147       146 
  BIG WOOD BASIN ...............................  8 of  9     186          *
  LITTLE WOOD BASIN ............................  5 of  5     196          *
  BIG LOST BASIN ...............................  5 of  5     191       213 
  LITTLE LOST, BIRCH BASINS ....................  4 of  4     157       180 
  MEDICINE LODGE, BEAVER, CAMAS BASINS .........  4 of  4     129       159 
  HENRYS FORK, TETON BASINS ....................  8 of  8     127       154 
  SNAKE BASIN ABOVE PALISADES .................. 17 of 18     164       167 
  WILLOW, BLACKFOOT, PORTNEUF BASINS ...........  6 of  6     156       168 
  SNAKE BASIN ABOVE AMERICAN FALLS ............. 28 of 29     152       164 
  RAFT BASIN ...................................  1 of  2     157       157 
  GOOSE CREEK BASIN ............................  2 of  2     132       141 
  SALMON FALLS BASIN ...........................  5 of  5     121       144 
  BRUNEAU BASIN ................................  5 of  5     129       154 
  OWYHEE BASIN .................................  8 of  8     134       139 
  BEAR RIVER BASIN ............................. 15 of 15     174       170 
MONTANA
  KOOTENAI RIVER BASIN .........................  8 of  8      92       130 
  FLATHEAD RIVER BASIN ......................... 13 of 16     100       122 
  UPPER CLARK FORK RIVER BASIN ................. 13 of 15      92       106 
  BITTERROOT RIVER BASIN .......................  7 of  7      98       103 
  LOWER CLARK FORK RIVER BASIN .................  8 of  8      94       117 
  JEFFERSON RIVER BASIN ........................ 19 of 19     101       118 
  MADISON RIVER BASIN .......................... 11 of 11     109       139 
  GALLATIN RIVER BASIN .........................  7 of  7      96       129 
  MISSOURI HEADWATERS .......................... 31 of 31     103       126 
  HEADWATERS MISSOURI MAINSTEM .................  5 of  5      94       109 
  SMITH, JUDITH, AND MUSSELSHELL RIVER BASINS ..  9 of 10      75       104 
  SUN, TETON AND MARIAS RIVER BASINS ...........  5 of  6     113       119 
  MISSOURI MAINSTEM RIVER BASIN ................ 19 of 21      93       113 
  ST. MARY AND MILK RIVER BASINS ...............  3 of  3     105       131 
  UPPER YELLOWSTONE RIVER BASIN ................ 22 of 24     128       139 
  WIND RIVER BASIN (WYOMING) ................... 11 of 13     201       190 
  SHOSHONE RIVER BASIN (WYOMING) ...............  5 of  6     162       184 
  BIGHORN RIVER BASIN (WYOMING) ................ 15 of 16     137       146 
  TONGUE RIVER BASIN (WYOMING) .................  6 of  7     103        98 
  POWDER RIVER BASIN (WYOMING) .................  6 of  7      91        95 
  LOWER YELLOWSTONE RIVER BASIN ................ 30 of 35     148       149 
NEVADA
  NORTHERN GREAT BASIN .........................  6 of  9     147       154 
  SNAKE RIVER ..................................  7 of 10     130       150 
  OWYHEE RIVER .................................  5 of  5     138       149 
  UPPER HUMBOLDT RIVER .........................  9 of  9     154       157 
  LOWER HUMBOLDT RIVER .........................  5 of  9     137          *
  CLOVER VALLEY & FRANKLIN RIVER ...............  4 of  6     153       154 
  EASTERN NEVADA BASINS ........................  4 of  4     143       131 
NEW MEXICO
  RIO CHAMA RIVER BASIN ........................  4 of  4     153       130 
  UPPER RIO GRANDE BASIN .......................  9 of  9     138       107 
  SANGRE DE CRISTO MOUNTAIN RANGE BASINS .......  8 of 11     117       102 
  JEMEZ RIVER BASIN ............................  3 of  3     111       106 
  SAN FRANCISCO RIVER BASIN ....................  3 of  3      69       125 
  GILA RIVER BASIN .............................  3 of  3      60       138 
  MIMBRES RIVER BASIN ..........................  2 of  2      48       140 
  PECOS RIVER BASIN ............................  1 of  1      92        88 
  SAN JUAN RIVER HEADWATERS ....................  5 of  5     137       114 
  ANIMAS RIVER BASIN ...........................  6 of  7     148       129 
  CIMARRON RIVER BASIN .........................  2 of  2     116        94 
  ZUNI/BLUEWATER RIVER BASIN ...................  1 of  1      97       153 
  RIO HONDO BASIN ..............................  1 of  1      59       102 
  CHUSKA MOUNTAINS .............................  0 of  1        *         *
OREGON
  OWYHEE .......................................  8 of  8     134       139 
  MALHEUR ......................................  3 of  3     127       123 
  GRANDE RONDE, POWDER, BURNT, IMNAHA .......... 16 of 17     113       123 
  UMATILLA, WALLA WALLA, WILLOW ................  7 of  8     123       114 
  JOHN DAY ..................................... 13 of 13     134       123 
  UPPER DESCHUTES, CROOKED ..................... 13 of 14     133       124 
  HOOD, SANDY, LOWER DESCHUTES .................  8 of  8     113       109 
  COAST RANGE ..................................  1 of  2        *      131 
  WILLAMETTE ................................... 18 of 23     134       121 
  ROGUE, UMPQUA ................................ 11 of 12     128       145 
  KLAMATH ...................................... 16 of 18     123       135 
  LAKE COUNTY, GOOSE LAKE ......................  8 of  9     146       152 
  HARNEY .......................................  8 of  9     124       118 
UTAH
  RAFT RIVER ...................................  1 of  2     157       157 
  BEAR RIVER ................................... 18 of 24     172          *
  WEBER-OGDEN RIVERS ........................... 17 of 20     160       151 
  PROVO R.-UTAH LAKE-JORDAN R. ................. 15 of 17     156       144 
  TOOELE VALLEY-VERNON CREEK ...................  3 of  4     157       138 
  NORTHEASTERN UINTAHS .........................  6 of 10     136       121 
  DUCHESNE RIVER ............................... 10 of 13     192       164 
  PRICE-SAN RAFAEL .............................  6 of 11     161       147 
  DIRTY DEVIL ..................................  3 of  6     157       118 
  SOUTH EASTERN UTAH ...........................  3 of  6     148       122 
  UPPER SEVIER RIVER ........................... 12 of 17     143       119 
  SAN PITCH RIVER ..............................  5 of 11        *         *
  LOWER SEVIER RIVER ...........................  1 of  3        *         *
  BEAVER RIVER .................................  2 of  2     149       125 
  ESCALANTE RIVER ..............................  3 of  4     131       110 
  SOUTHWESTERN UTAH ............................ 10 of 13     161       132 
WASHINGTON
  NORTHERN PANHANDLE ........................... 10 of 10      86       133 
  SPOKANE ...................................... 10 of 10      89       118 
  UPPER COLUMBIA ...............................  5 of  6     109       138 
  CENTRAL COLUMBIA .............................  6 of  8      97       108 
  UPPER YAKIMA .................................  4 of  5      86        94 
  LOWER YAKIMA .................................  7 of  9      98       122 
  LOWER SNAKE .................................. 20 of 22      99       112 
  LOWER COLUMBIA ............................... 18 of 22     122       123 
  SOUTH PUGET SOUND ............................  7 of 10      99       107 
  CENTRAL PUGET SOUND ..........................  9 of  9     103        98 
  NORTH PUGET SOUND ............................  6 of 12      91       110 
  OLYMPIC ......................................  3 of  4     104       139 
WYOMING
  SNAKE RIVER .................................. 19 of 20     156       164 
  MADISON-GALLATIN .............................  5 of  5     127       149 
  YELLOWSTONE .................................. 12 of 13     143       150 
  WIND RIVER ................................... 10 of 12     202       188 
  BIGHORN BASIN ................................ 10 of 11     114       110 
  SHOSHONE RIVER ...............................  4 of  5     170       185 
  POWDER RIVER .................................  6 of  7      91        95 
  TONGUE RIVER .................................  6 of  7     103        98 
  BELLE FOURCHE ................................  1 of  1      54        71 
  CHEYENNE RIVER BASIN .........................  2 of  2      75        72 
  UPPER N. PLATTE .............................. 16 of 18     126       126 
  SWEETWATER ...................................  3 of  3     227       184 
  LOWER N. PLATTE ..............................  4 of  4     116        96 
  LARAMIE RIVER ................................  6 of  6     121       117 
  S. PLATTE ....................................  2 of  3     116       119 
  LITTLE SNAKE RIVER ...........................  8 of  8     125       118 
  UPPER GREEN RIVER ............................ 12 of 13     194       195 
  LOWER GREEN RIVER ............................  7 of 11     164       149 
  UPPER BEAR RIVER .............................  7 of  9     171          *
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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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