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: MARCH 28 , 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      56        60 
  SUSITNA BASIN ................................  3 of  5      81        59 
  NORTHERN KENAI MOUNTAINS .....................  7 of  7      71        71 
  SOUTHERN KENAI ...............................  3 of  6      76        72 
  COPPER BASIN .................................  2 of  3      88        63 
  PRINCE WILLIAM SOUND .........................  1 of  7        *       68 
  CHENA BASIN ..................................  6 of  7     140       105 
  UPPER TANANA .................................  2 of  5        *         *
  KOYUKUK BASIN ................................  2 of  6        *       51 
  CENTRAL YUKON BASIN ..........................  0 of  5        *       92 
  NORTON SOUND .................................  0 of  4        *       68 
  KUPARUK-SAGAVANIRKTOK RIVER BASIN ............  0 of  3        *       96 
  NORTHWEST ARCTIC RIVER BASIN .................  0 of  1        *         *
  SOUTHEAST ALASKA BASIN .......................  1 of  3        *       85 
ARIZONA
  VERDE RIVER BASIN ............................  5 of 10      75*      137 
  SAN FRANCISCO PEAKS ..........................  1 of  1     181       152 
  CENTRAL MOGOLLON RIM .........................  3 of  4      30       136 
  LITTLE COLORADO - SOUTHERN HEADWATERS ........  5 of  6      18       132 
  UPPER SALT RIVER BASIN / WHITE MOUNTAINS .....  7 of  9       6*      116 
  SAN FRANCISCO / UPPER GILA RIVER BASIN .......  7 of  8       1*      111 
  CHUSKA MOUNTAINS .............................  0 of  2        *         *
CALIFORNIA
  NORTHERN GREAT BASIN .........................  3 of  5     132       141 
  TRUCKEE RIVER ................................  8 of  9     193       210 
  LAKE TAHOE ...................................  8 of  8     222       223 
  CARSON RIVER .................................  9 of  9     204          *
  WALKER RIVER .................................  6 of  7     220       199 
  KLAMATH ...................................... 16 of 18     120       138 
COLORADO
  GUNNISON RIVER BASIN ......................... 13 of 16     125       112 
  UPPER COLORADO RIVER BASIN ................... 27 of 31     109       109 
  SOUTH PLATTE RIVER BASIN ..................... 16 of 22     102       113 
  LARAMIE AND NORTH PLATTE RIVER BASINS ........ 12 of 12     104       116 
  YAMPA AND WHITE RIVER BASINS ................. 19 of 20      93       105 
  ARKANSAS RIVER BASIN .........................  7 of  9     105       106 
  UPPER RIO GRANDE BASIN ....................... 11 of 16     120       104 
  SAN MIGUEL, DOLORES, ANIMAS
     AND SAN JUAN RIVER BASIN .................. 17 of 19     130       118 
IDAHO
  NORTHERN PANHANDLE REGION .................... 10 of 10      97       143 
  SPOKANE RIVER BASIN .......................... 10 of 10      96       132 
  CLEARWATER BASIN ............................. 15 of 16     103       124 
  SALMON BASIN ................................. 22 of 22     127       138 
  WEISER BASIN .................................  3 of  4     111       132 
  PAYETTE BASIN ................................ 11 of 11     122       148 
  BOISE BASIN ..................................  9 of 10     139       158 
  BIG WOOD BASIN ...............................  7 of  9     172       179 
  LITTLE WOOD BASIN ............................  4 of  5     171       199 
  BIG LOST BASIN ...............................  5 of  5     169       194 
  LITTLE LOST, BIRCH BASINS ....................  4 of  4     133       157 
  MEDICINE LODGE, BEAVER, CAMAS BASINS .........  4 of  4     104       142 
  HENRYS FORK, TETON BASINS ....................  8 of  8     119       152 
  SNAKE BASIN ABOVE PALISADES .................. 16 of 18     150       166 
  WILLOW, BLACKFOOT, PORTNEUF BASINS ...........  6 of  6     116       157 
  SNAKE BASIN ABOVE AMERICAN FALLS ............. 27 of 29     134       160 
  RAFT BASIN ...................................  1 of  2     137       148 
  GOOSE CREEK BASIN ............................  2 of  2     108       132 
  SALMON FALLS BASIN ...........................  5 of  5     104       133 
  BRUNEAU BASIN ................................  5 of  5     109       141 
  OWYHEE BASIN .................................  8 of  8      96       133 
  BEAR RIVER BASIN ............................. 15 of 15     152       162 
MONTANA
  KOOTENAI RIVER BASIN .........................  8 of  8     102       139 
  FLATHEAD RIVER BASIN ......................... 13 of 16     109       134 
  UPPER CLARK FORK RIVER BASIN ................. 13 of 15     100       115 
  BITTERROOT RIVER BASIN .......................  7 of  7     106       119 
  LOWER CLARK FORK RIVER BASIN .................  8 of  8     106       134 
  JEFFERSON RIVER BASIN ........................ 19 of 19      95       116 
  MADISON RIVER BASIN .......................... 11 of 11     104       135 
  GALLATIN RIVER BASIN .........................  7 of  7      92       126 
  MISSOURI HEADWATERS .......................... 31 of 31      97       123 
  HEADWATERS MISSOURI MAINSTEM .................  5 of  5      93       112 
  SMITH, JUDITH, AND MUSSELSHELL RIVER BASINS ..  9 of 10      74       105 
  SUN, TETON AND MARIAS RIVER BASINS ...........  5 of  6     120       127 
  MISSOURI MAINSTEM RIVER BASIN ................ 19 of 21      92       116 
  ST. MARY AND MILK RIVER BASINS ...............  3 of  3     111       142 
  UPPER YELLOWSTONE RIVER BASIN ................ 22 of 24     120       143 
  WIND RIVER BASIN (WYOMING) ................... 11 of 13     173       178 
  SHOSHONE RIVER BASIN (WYOMING) ...............  5 of  6     148       186 
  BIGHORN RIVER BASIN (WYOMING) ................ 15 of 16     128       147 
  TONGUE RIVER BASIN (WYOMING) .................  6 of  7     104       105 
  POWDER RIVER BASIN (WYOMING) .................  6 of  7      85        96 
  LOWER YELLOWSTONE RIVER BASIN ................ 30 of 35     134       146 
NEVADA
  NORTHERN GREAT BASIN .........................  6 of  9     125       145 
  SNAKE RIVER ..................................  7 of 10     109       138 
  OWYHEE RIVER .................................  5 of  5     109       140 
  UPPER HUMBOLDT RIVER .........................  9 of  9     125       148 
  LOWER HUMBOLDT RIVER .........................  5 of  9     117       143 
  CLOVER VALLEY & FRANKLIN RIVER ...............  4 of  6     122       144 
  EASTERN NEVADA BASINS ........................  4 of  4     117       120 
NEW MEXICO
  RIO CHAMA RIVER BASIN ........................  4 of  4     138       132 
  UPPER RIO GRANDE BASIN .......................  9 of  9     119       104 
  SANGRE DE CRISTO MOUNTAIN RANGE BASINS .......  8 of 11      87        99 
  JEMEZ RIVER BASIN ............................  3 of  3      46        98 
  SAN FRANCISCO RIVER BASIN ....................  3 of  3       0*      106 
  GILA RIVER BASIN .............................  3 of  3       0*      117 
  MIMBRES RIVER BASIN ..........................  2 of  2        *      121 
  PECOS RIVER BASIN ............................  1 of  1      52        76 
  SAN JUAN RIVER HEADWATERS ....................  5 of  5     118       107 
  ANIMAS RIVER BASIN ...........................  7 of  7     131       115 
  CIMARRON RIVER BASIN .........................  1 of  2      41        90 
  ZUNI/BLUEWATER RIVER BASIN ...................  0 of  1        *      148 
  RIO HONDO BASIN ..............................  1 of  1       1        88 
  CHUSKA MOUNTAINS .............................  0 of  1        *         *
OREGON
  OWYHEE .......................................  8 of  8      96       133 
  MALHEUR ......................................  2 of  3      97       129 
  GRANDE RONDE, POWDER, BURNT, IMNAHA .......... 16 of 17     112       132 
  UMATILLA, WALLA WALLA, WILLOW ................  6 of  8     112       126 
  JOHN DAY ..................................... 13 of 13     115       128 
  UPPER DESCHUTES, CROOKED ..................... 13 of 14     125       132 
  HOOD, SANDY, LOWER DESCHUTES .................  8 of  8     129       121 
  COAST RANGE ..................................  1 of  2        *      140 
  WILLAMETTE ................................... 18 of 23     136       130 
  ROGUE, UMPQUA ................................ 11 of 12     123       145 
  KLAMATH ...................................... 16 of 18     120       138 
  LAKE COUNTY, GOOSE LAKE ......................  8 of  9     129       148 
  HARNEY .......................................  7 of  9     104       120 
UTAH
  RAFT RIVER ...................................  1 of  2     137       148 
  BEAR RIVER ................................... 17 of 24     150       163 
  WEBER-OGDEN RIVERS ........................... 17 of 20     128       145 
  PROVO R.-UTAH LAKE-JORDAN R. ................. 15 of 17     126       137 
  TOOELE VALLEY-VERNON CREEK ...................  3 of  4     122       132 
  NORTHEASTERN UINTAHS .........................  6 of 10     100       121 
  DUCHESNE RIVER ............................... 12 of 13     165       156 
  PRICE-SAN RAFAEL .............................  6 of 11     128       136 
  DIRTY DEVIL ..................................  3 of  6     107       113 
  SOUTH EASTERN UTAH ...........................  3 of  6      82       107 
  UPPER SEVIER RIVER ........................... 11 of 17      96       109 
  SAN PITCH RIVER ..............................  5 of 11        *         *
  LOWER SEVIER RIVER ...........................  1 of  3        *         *
  BEAVER RIVER .................................  2 of  2     136       120 
  ESCALANTE RIVER ..............................  3 of  4      99       100 
  SOUTHWESTERN UTAH ............................  9 of 13     104       113 
WASHINGTON
  NORTHERN PANHANDLE ........................... 10 of 10      97       143 
  SPOKANE ...................................... 10 of 10      96       132 
  UPPER COLUMBIA ...............................  5 of  6     117       142 
  CENTRAL COLUMBIA .............................  6 of  8     107       114 
  UPPER YAKIMA .................................  4 of  5     102       104 
  LOWER YAKIMA .................................  7 of  9     107       132 
  LOWER SNAKE .................................. 21 of 22     105       126 
  LOWER COLUMBIA ............................... 18 of 22     137       133 
  SOUTH PUGET SOUND ............................  7 of 10     110       114 
  CENTRAL PUGET SOUND ..........................  8 of  9     113       107 
  NORTH PUGET SOUND ............................  7 of 12     108       120 
  OLYMPIC ......................................  2 of  4     113       139 
WYOMING
  SNAKE RIVER .................................. 18 of 20     144       162 
  MADISON-GALLATIN .............................  5 of  5     117       146 
  YELLOWSTONE .................................. 12 of 13     137       155 
  WIND RIVER ................................... 10 of 12     172       175 
  BIGHORN BASIN ................................ 10 of 11     109       112 
  SHOSHONE RIVER ...............................  4 of  5     155       190 
  POWDER RIVER .................................  6 of  7      85        96 
  TONGUE RIVER .................................  6 of  7     104       105 
  BELLE FOURCHE ................................  1 of  1       0        81 
  CHEYENNE RIVER BASIN .........................  2 of  2      12        76 
  UPPER N. PLATTE .............................. 16 of 18     101       116 
  SWEETWATER ...................................  3 of  3     180       172 
  LOWER N. PLATTE ..............................  4 of  4      90        92 
  LARAMIE RIVER ................................  6 of  6      98       107 
  S. PLATTE ....................................  2 of  3      92       106 
  LITTLE SNAKE RIVER ...........................  8 of  8      90       112 
  UPPER GREEN RIVER ............................ 11 of 13     174       182 
  LOWER GREEN RIVER ............................  7 of 11     133       145 
  UPPER BEAR RIVER .............................  7 of  9     145       152 
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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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