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 THURSDAY: MAY 25 , 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      11        66 
  SUSITNA BASIN ................................  2 of  5        *       63 
  NORTHERN KENAI MOUNTAINS .....................  7 of  7      41*       76 
  SOUTHERN KENAI ...............................  3 of  6    1500*       73 
  COPPER BASIN .................................  2 of  3      83*       64 
  PRINCE WILLIAM SOUND .........................  1 of  7        *       74 
  CHENA BASIN ..................................  6 of  7    1200*      108 
  UPPER TANANA .................................  2 of  5        *         *
  KOYUKUK BASIN ................................  2 of  6        *       62 
  CENTRAL YUKON BASIN ..........................  0 of  5        *       95 
  NORTON SOUND .................................  0 of  4        *       68 
  KUPARUK-SAGAVANIRKTOK RIVER BASIN ............  0 of  3        *       93 
  NORTHWEST ARCTIC RIVER BASIN .................  0 of  1        *         *
  SOUTHEAST ALASKA BASIN .......................  1 of  3        *       90 
ARIZONA
  VERDE RIVER BASIN ............................  4 of 10        *      124 
  SAN FRANCISCO PEAKS ..........................  1 of  1        *      138 
  CENTRAL MOGOLLON RIM .........................  3 of  4        *      122 
  LITTLE COLORADO - SOUTHERN HEADWATERS ........  4 of  6        *      121 
  UPPER SALT RIVER BASIN / WHITE MOUNTAINS .....  6 of  9        *      108 
  SAN FRANCISCO / UPPER GILA RIVER BASIN .......  7 of  8        *      101 
  CHUSKA MOUNTAINS .............................  0 of  2        *         *
CALIFORNIA
  NORTHERN GREAT BASIN .........................  3 of  5        *      136 
  TRUCKEE RIVER ................................  8 of  9     333*      203 
  LAKE TAHOE ...................................  8 of  8    7205*      214 
  CARSON RIVER .................................  9 of  9     647*      195 
  WALKER RIVER .................................  7 of  7     422*      209 
  KLAMATH ...................................... 14 of 18     186*      133 
COLORADO
  GUNNISON RIVER BASIN ......................... 12 of 16     169*      110 
  UPPER COLORADO RIVER BASIN ................... 25 of 31     150*      111 
  SOUTH PLATTE RIVER BASIN ..................... 17 of 22     157       119 
  LARAMIE AND NORTH PLATTE RIVER BASINS ........ 12 of 12     109       116 
  YAMPA AND WHITE RIVER BASINS ................. 17 of 20     106*      104 
  ARKANSAS RIVER BASIN .........................  7 of  9     145*      115 
  UPPER RIO GRANDE BASIN ....................... 12 of 16     168*      108 
  SAN MIGUEL, DOLORES, ANIMAS
     AND SAN JUAN RIVER BASIN .................. 17 of 19     170*      111 
IDAHO
  NORTHERN PANHANDLE REGION .................... 10 of 10     130       140 
  SPOKANE RIVER BASIN .......................... 10 of 10     127       130 
  CLEARWATER BASIN ............................. 15 of 16     137       120 
  SALMON BASIN ................................. 22 of 22     180       137 
  WEISER BASIN .................................  4 of  4        *      134 
  PAYETTE BASIN ................................ 11 of 11     215       145 
  BOISE BASIN ..................................  8 of 10     194       155 
  BIG WOOD BASIN ...............................  8 of  9     250*      166 
  LITTLE WOOD BASIN ............................  5 of  5     252*      171 
  BIG LOST BASIN ...............................  5 of  5     260       171 
  LITTLE LOST, BIRCH BASINS ....................  4 of  4     171*      142 
  MEDICINE LODGE, BEAVER, CAMAS BASINS .........  4 of  4     162*      133 
  HENRYS FORK, TETON BASINS ....................  8 of  8     147       144 
  SNAKE BASIN ABOVE PALISADES .................. 15 of 18     211*      154 
  WILLOW, BLACKFOOT, PORTNEUF BASINS ...........  6 of  6        *      147 
  SNAKE BASIN ABOVE AMERICAN FALLS ............. 26 of 29     181*      150 
  RAFT BASIN ...................................  1 of  2    1727*      150 
  GOOSE CREEK BASIN ............................  2 of  2        *      132 
  SALMON FALLS BASIN ...........................  5 of  5     171*      131 
  BRUNEAU BASIN ................................  5 of  5     171*      135 
  OWYHEE BASIN .................................  8 of  8        *      134 
  BEAR RIVER BASIN ............................. 15 of 15     297*      150 
MONTANA
  KOOTENAI RIVER BASIN .........................  8 of  8     132       133 
  FLATHEAD RIVER BASIN ......................... 13 of 16     137*      129 
  UPPER CLARK FORK RIVER BASIN ................. 13 of 15     115       113 
  BITTERROOT RIVER BASIN .......................  7 of  7     127*      115 
  LOWER CLARK FORK RIVER BASIN .................  8 of  8     160       128 
  JEFFERSON RIVER BASIN ........................ 19 of 19     105       116 
  MADISON RIVER BASIN .......................... 11 of 11     108       129 
  GALLATIN RIVER BASIN .........................  7 of  7     103       124 
  MISSOURI HEADWATERS .......................... 31 of 31     106       121 
  HEADWATERS MISSOURI MAINSTEM .................  5 of  5      93       111 
  SMITH, JUDITH, AND MUSSELSHELL RIVER BASINS ..  9 of 10      67*      105 
  SUN, TETON AND MARIAS RIVER BASINS ...........  5 of  6     138*      120 
  MISSOURI MAINSTEM RIVER BASIN ................ 19 of 21      99*      111 
  ST. MARY AND MILK RIVER BASINS ...............  3 of  3     138*      127 
  UPPER YELLOWSTONE RIVER BASIN ................ 21 of 24     123       134 
  WIND RIVER BASIN (WYOMING) ................... 11 of 13     278*      169 
  SHOSHONE RIVER BASIN (WYOMING) ...............  5 of  6     124       162 
  BIGHORN RIVER BASIN (WYOMING) ................ 15 of 16     131       138 
  TONGUE RIVER BASIN (WYOMING) .................  6 of  7     196       115 
  POWDER RIVER BASIN (WYOMING) .................  6 of  7     177*      121 
  LOWER YELLOWSTONE RIVER BASIN ................ 30 of 35     191*      143 
NEVADA
  NORTHERN GREAT BASIN .........................  6 of  9     268*      141 
  SNAKE RIVER ..................................  7 of 10     171*      134 
  OWYHEE RIVER .................................  5 of  5        *      137 
  UPPER HUMBOLDT RIVER .........................  9 of  9     358*      142 
  LOWER HUMBOLDT RIVER .........................  5 of  9     246*      136 
  CLOVER VALLEY & FRANKLIN RIVER ...............  4 of  6        *      141 
  EASTERN NEVADA BASINS ........................  4 of  4     186*      112 
NEW MEXICO
  RIO CHAMA RIVER BASIN ........................  4 of  4        *      129 
  UPPER RIO GRANDE BASIN .......................  9 of  9     161*      105 
  SANGRE DE CRISTO MOUNTAIN RANGE BASINS .......  9 of 11      97*      110 
  JEMEZ RIVER BASIN ............................  3 of  3        *      103 
  SAN FRANCISCO RIVER BASIN ....................  3 of  3        *       96 
  GILA RIVER BASIN .............................  3 of  3        *      105 
  MIMBRES RIVER BASIN ..........................  2 of  2        *      110 
  PECOS RIVER BASIN ............................  1 of  1        *       92 
  SAN JUAN RIVER HEADWATERS ....................  5 of  5     119       103 
  ANIMAS RIVER BASIN ...........................  7 of  7     212*      110 
  CIMARRON RIVER BASIN .........................  2 of  2        *      112 
  ZUNI/BLUEWATER RIVER BASIN ...................  0 of  1        *      135 
  RIO HONDO BASIN ..............................  1 of  1        *       92 
  CHUSKA MOUNTAINS .............................  0 of  1        *         *
OREGON
  OWYHEE .......................................  8 of  8        *      134 
  MALHEUR ......................................  2 of  3        *      127 
  GRANDE RONDE, POWDER, BURNT, IMNAHA .......... 16 of 17     212*      130 
  UMATILLA, WALLA WALLA, WILLOW ................  7 of  8    1240*      126 
  JOHN DAY ..................................... 12 of 13        *      127 
  UPPER DESCHUTES, CROOKED ..................... 13 of 14     145*      130 
  HOOD, SANDY, LOWER DESCHUTES .................  8 of  8     167*      123 
  COAST RANGE ..................................  1 of  2        *      141 
  WILLAMETTE ................................... 18 of 23     196*      130 
  ROGUE, UMPQUA ................................ 11 of 12     176*      141 
  KLAMATH ...................................... 14 of 18     186*      133 
  LAKE COUNTY, GOOSE LAKE ......................  7 of  9        *      137 
  HARNEY .......................................  8 of  9     191*      120 
UTAH
  RAFT RIVER ...................................  1 of  2    1727*      150 
  BEAR RIVER ................................... 18 of 24     279*      153 
  WEBER-OGDEN RIVERS ........................... 17 of 20     232*      135 
  PROVO R.-UTAH LAKE-JORDAN R. ................. 14 of 17     180*      126 
  TOOELE VALLEY-VERNON CREEK ...................  3 of  4     722*      123 
  NORTHEASTERN UINTAHS .........................  6 of 10     120*      116 
  DUCHESNE RIVER ............................... 11 of 13     180*      137 
  PRICE-SAN RAFAEL .............................  6 of 11     108*      126 
  DIRTY DEVIL ..................................  2 of  6        *      117 
  SOUTH EASTERN UTAH ...........................  3 of  6        *       95 
  UPPER SEVIER RIVER ........................... 12 of 17     118*      106 
  SAN PITCH RIVER ..............................  4 of 11        *         *
  LOWER SEVIER RIVER ...........................  1 of  3        *         *
  BEAVER RIVER .................................  2 of  2     126       114 
  ESCALANTE RIVER ..............................  3 of  4        *       96 
  SOUTHWESTERN UTAH ............................ 10 of 13     148*      111 
WASHINGTON
  NORTHERN PANHANDLE ........................... 10 of 10     130       140 
  SPOKANE ...................................... 10 of 10     127       130 
  UPPER COLUMBIA ...............................  5 of  6     166*      144 
  CENTRAL COLUMBIA .............................  7 of  8     128*      120 
  UPPER YAKIMA .................................  4 of  5     103       105 
  LOWER YAKIMA .................................  6 of  9     130       131 
  LOWER SNAKE .................................. 21 of 22     146       123 
  LOWER COLUMBIA ............................... 18 of 22     207*      134 
  SOUTH PUGET SOUND ............................  7 of 10     125*      115 
  CENTRAL PUGET SOUND ..........................  9 of  9     158       111 
  NORTH PUGET SOUND ............................  7 of 12     126       121 
  OLYMPIC ......................................  3 of  4     162       140 
WYOMING
  SNAKE RIVER .................................. 17 of 20     163       152 
  MADISON-GALLATIN .............................  5 of  5     136       136 
  YELLOWSTONE .................................. 11 of 13     148       141 
  WIND RIVER ................................... 10 of 12     332*      169 
  BIGHORN BASIN ................................ 10 of 11     140*      121 
  SHOSHONE RIVER ...............................  4 of  5     129       164 
  POWDER RIVER .................................  6 of  7     177*      121 
  TONGUE RIVER .................................  6 of  7     196       115 
  BELLE FOURCHE ................................  1 of  1        *       90 
  CHEYENNE RIVER BASIN .........................  2 of  2        *       85 
  UPPER N. PLATTE .............................. 15 of 18     116       113 
  SWEETWATER ...................................  3 of  3     470       169 
  LOWER N. PLATTE ..............................  4 of  4     173*      107 
  LARAMIE RIVER ................................  6 of  6     108       109 
  S. PLATTE ....................................  2 of  3     123*      114 
  LITTLE SNAKE RIVER ...........................  7 of  8     111*      108 
  UPPER GREEN RIVER ............................ 10 of 13     348*      164 
  LOWER GREEN RIVER ............................  7 of 11     189*      144 
  UPPER BEAR RIVER .............................  7 of  9     298*      142 
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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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