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 MONDAY: JANUARY 15 , 2018
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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      46        82 
  SUSITNA BASIN ................................  3 of  5      94       131 
  NORTHERN KENAI MOUNTAINS .....................  7 of  7      58        93 
  SOUTHERN KENAI ...............................  3 of  6      75       106 
  COPPER BASIN .................................  1 of  3        *         *
  PRINCE WILLIAM SOUND .........................  1 of  7        *      116 
  CHENA BASIN ..................................  6 of  7     157       169 
  UPPER TANANA .................................  2 of  5        *         *
  KOYUKUK BASIN ................................  2 of  6        *      111 
  CENTRAL YUKON BASIN ..........................  0 of  5        *      151 
  NORTON SOUND .................................  0 of  4        *      175 
  KUPARUK-SAGAVANIRKTOK RIVER BASIN ............  0 of  3        *      129 
  NORTHWEST ARCTIC RIVER BASIN .................  0 of  1        *         *
  SOUTHEAST ALASKA BASIN .......................  1 of  3        *       86 
ARIZONA
  VERDE RIVER BASIN ............................  5 of 10      12        10 
  SAN FRANCISCO PEAKS ..........................  1 of  1      15          *
  CENTRAL MOGOLLON RIM .........................  3 of  4       8         9 
  LITTLE COLORADO - SOUTHERN HEADWATERS ........  5 of  6      14        11 
  UPPER SALT RIVER BASIN / WHITE MOUNTAINS .....  7 of  9      14          *
  SAN FRANCISCO / UPPER GILA RIVER BASIN .......  7 of  8      13          *
  CHUSKA MOUNTAINS .............................  0 of  2        *         *
CALIFORNIA
  NORTHERN GREAT BASIN .........................  4 of  5      51        65 
  TRUCKEE RIVER ................................  8 of  9      42        78 
  LAKE TAHOE ...................................  8 of  8      25        83 
  CARSON RIVER .................................  9 of  9      46        66 
  WALKER RIVER .................................  7 of  7      49        68 
  KLAMATH ...................................... 10 of 18      29        69 
COLORADO
  GUNNISON RIVER BASIN ......................... 12 of 16      47        43 
  UPPER COLORADO RIVER BASIN ................... 27 of 31      74        75 
  SOUTH PLATTE RIVER BASIN ..................... 16 of 22      89       102 
  LARAMIE AND NORTH PLATTE RIVER BASINS ........ 12 of 12      83        93 
  YAMPA AND WHITE RIVER BASINS ................. 19 of 20      75        74 
  ARKANSAS RIVER BASIN .........................  6 of  9      58        59 
  UPPER RIO GRANDE BASIN ....................... 10 of 16      34        33 
  SAN MIGUEL, DOLORES, ANIMAS
     AND SAN JUAN RIVER BASIN .................. 17 of 19      34        27 
IDAHO
  NORTHERN PANHANDLE REGION .................... 10 of 10      92       103 
  SPOKANE RIVER BASIN ..........................  9 of 10      96       109 
  CLEARWATER BASIN ............................. 13 of 16     108       113 
  SALMON BASIN ................................. 22 of 22      96        92 
  WEISER BASIN .................................  4 of  4      48        74 
  PAYETTE BASIN ................................ 11 of 11      72        85 
  BOISE BASIN ..................................  9 of 10      65        85 
  BIG WOOD BASIN ...............................  8 of  9      78        85 
  LITTLE WOOD BASIN ............................  5 of  5      77        90 
  BIG LOST BASIN ...............................  5 of  5      90        93 
  LITTLE LOST, BIRCH BASINS ....................  4 of  4     102        83 
  MEDICINE LODGE, BEAVER, CAMAS BASINS .........  4 of  4      90        77 
  HENRYS FORK, TETON BASINS ....................  7 of  8     102        92 
  SNAKE BASIN ABOVE PALISADES .................. 18 of 18     116       103 
  WILLOW, BLACKFOOT, PORTNEUF BASINS ...........  6 of  6      69        86 
  SNAKE BASIN ABOVE AMERICAN FALLS ............. 28 of 29     107        98 
  RAFT BASIN ...................................  1 of  2      85        85 
  GOOSE CREEK BASIN ............................  2 of  2      67        83 
  SALMON FALLS BASIN ...........................  5 of  5      66        85 
  BRUNEAU BASIN ................................  5 of  5      58        85 
  OWYHEE BASIN .................................  7 of  8      40        85 
  BEAR RIVER BASIN ............................. 15 of 15      83        79 
MONTANA
  KOOTENAI RIVER BASIN .........................  8 of  8     101       104 
  FLATHEAD RIVER BASIN ......................... 11 of 16     122       120 
  UPPER CLARK FORK RIVER BASIN ................. 13 of 15     143       120 
  BITTERROOT RIVER BASIN .......................  7 of  7     113       108 
  LOWER CLARK FORK RIVER BASIN .................  8 of  8     107       111 
  JEFFERSON RIVER BASIN ........................ 19 of 19     128       100 
  MADISON RIVER BASIN ..........................  8 of 11     114       101 
  GALLATIN RIVER BASIN .........................  6 of  7     135       122 
  MISSOURI HEADWATERS .......................... 28 of 31     126       104 
  HEADWATERS MISSOURI MAINSTEM .................  5 of  5     151       121 
  SMITH, JUDITH, AND MUSSELSHELL RIVER BASINS ..  9 of 10     138       116 
  SUN, TETON AND MARIAS RIVER BASINS ...........  4 of  6     109       119 
  MISSOURI MAINSTEM RIVER BASIN ................ 18 of 21     135       119 
  ST. MARY AND MILK RIVER BASINS ...............  3 of  3      96       119 
  UPPER YELLOWSTONE RIVER BASIN ................ 22 of 24     153       130 
  WIND RIVER BASIN (WYOMING) ................... 10 of 13     133       112 
  SHOSHONE RIVER BASIN (WYOMING) ...............  4 of  6     148       140 
  BIGHORN RIVER BASIN (WYOMING) ................ 14 of 16     136       114 
  TONGUE RIVER BASIN (WYOMING) .................  6 of  7      91        73 
  POWDER RIVER BASIN (WYOMING) .................  6 of  7     112        89 
  LOWER YELLOWSTONE RIVER BASIN ................ 29 of 35     125       105 
NEVADA
  NORTHERN GREAT BASIN .........................  7 of  9      49        74 
  SNAKE RIVER ..................................  7 of 10      61        84 
  OWYHEE RIVER .................................  5 of  5      41        86 
  UPPER HUMBOLDT RIVER .........................  9 of  9      43        76 
  LOWER HUMBOLDT RIVER .........................  5 of  9      41        76 
  CLOVER VALLEY & FRANKLIN RIVER ...............  4 of  6      42        72 
  EASTERN NEVADA BASINS ........................  4 of  4      36        38 
NEW MEXICO
  RIO CHAMA RIVER BASIN ........................  3 of  4      25        30 
  UPPER RIO GRANDE BASIN .......................  7 of  9      33        30 
  SANGRE DE CRISTO MOUNTAIN RANGE BASINS .......  5 of 11        *       40 
  JEMEZ RIVER BASIN ............................  2 of  3      19          *
  SAN FRANCISCO RIVER BASIN ....................  3 of  3      12        15 
  GILA RIVER BASIN .............................  3 of  3      14          *
  MIMBRES RIVER BASIN ..........................  2 of  2       4        24 
  PECOS RIVER BASIN ............................  0 of  1        *         *
  SAN JUAN RIVER HEADWATERS ....................  5 of  5      31        23 
  ANIMAS RIVER BASIN ...........................  7 of  7      36        24 
  CIMARRON RIVER BASIN .........................  0 of  2        *       31 
  ZUNI/BLUEWATER RIVER BASIN ...................  1 of  1      14          *
  RIO HONDO BASIN ..............................  1 of  1      16        39 
  CHUSKA MOUNTAINS .............................  0 of  1        *         *
OREGON
  OWYHEE .......................................  7 of  8      40        85 
  MALHEUR ......................................  3 of  3      38        80 
  GRANDE RONDE, POWDER, BURNT, IMNAHA .......... 15 of 17      60        90 
  UMATILLA, WALLA WALLA, WILLOW ................  7 of  8      55       101 
  JOHN DAY ..................................... 12 of 13      43        77 
  UPPER DESCHUTES, CROOKED ..................... 10 of 14      37        79 
  HOOD, SANDY, LOWER DESCHUTES .................  8 of  8      44       102 
  COAST RANGE ..................................  1 of  2       0       103 
  WILLAMETTE ................................... 17 of 23      33        89 
  ROGUE, UMPQUA ................................  9 of 12      32        70 
  KLAMATH ...................................... 10 of 18      29        69 
  LAKE COUNTY, GOOSE LAKE ......................  6 of  9      44        71 
  HARNEY .......................................  9 of  9      44        73 
UTAH
  RAFT RIVER ...................................  1 of  2      85        85 
  BEAR RIVER ................................... 18 of 24      81        79 
  WEBER-OGDEN RIVERS ........................... 17 of 20      61        63 
  PROVO R.-UTAH LAKE-JORDAN R. ................. 15 of 17      56        54 
  TOOELE VALLEY-VERNON CREEK ...................  3 of  4      45        45 
  NORTHEASTERN UINTAHS .........................  6 of 10      77        62 
  DUCHESNE RIVER ............................... 12 of 13      61        56 
  PRICE-SAN RAFAEL .............................  6 of 11      40        51 
  DIRTY DEVIL ..................................  3 of  6      39        45 
  SOUTH EASTERN UTAH ...........................  3 of  6      25        25 
  UPPER SEVIER RIVER ........................... 12 of 17      41        38 
  SAN PITCH RIVER ..............................  5 of 11        *         *
  LOWER SEVIER RIVER ...........................  1 of  3        *         *
  BEAVER RIVER .................................  2 of  2      25        28 
  ESCALANTE RIVER ..............................  3 of  4      29        31 
  SOUTHWESTERN UTAH ............................ 10 of 13      33        30 
WASHINGTON
  NORTHERN PANHANDLE ........................... 10 of 10      92       103 
  SPOKANE ......................................  9 of 10      96       109 
  UPPER COLUMBIA ...............................  5 of  6     111        98 
  CENTRAL COLUMBIA .............................  7 of  8      91       108 
  UPPER YAKIMA .................................  4 of  5      79       104 
  LOWER YAKIMA .................................  6 of  9      87       109 
  LOWER SNAKE .................................. 18 of 22      95       107 
  LOWER COLUMBIA ............................... 18 of 22      66       105 
  SOUTH PUGET SOUND ............................  5 of 10      82*      115 
  CENTRAL PUGET SOUND ..........................  9 of  9      78       110 
  NORTH PUGET SOUND ............................  6 of 12     107       106 
  OLYMPIC ......................................  3 of  4      93        95 
WYOMING
  SNAKE RIVER .................................. 18 of 20     118       102 
  MADISON-GALLATIN .............................  3 of  5     108        97 
  YELLOWSTONE .................................. 13 of 13     154       129 
  WIND RIVER ................................... 10 of 12     133       112 
  BIGHORN BASIN ................................ 10 of 11     127        93 
  SHOSHONE RIVER ...............................  3 of  5     155       147 
  POWDER RIVER .................................  6 of  7     112        89 
  TONGUE RIVER .................................  6 of  7      91        73 
  BELLE FOURCHE ................................  1 of  1     123        94 
  CHEYENNE RIVER BASIN .........................  2 of  2     104        82 
  UPPER N. PLATTE .............................. 16 of 18      83        88 
  SWEETWATER ...................................  3 of  3      90        68 
  LOWER N. PLATTE ..............................  4 of  4      73        68 
  LARAMIE RIVER ................................  6 of  6     104       111 
  S. PLATTE ....................................  2 of  3      93       114 
  LITTLE SNAKE RIVER ...........................  8 of  8      76        76 
  UPPER GREEN RIVER ............................ 12 of 13     120       106 
  LOWER GREEN RIVER ............................  7 of 11      89        74 
  UPPER BEAR RIVER .............................  7 of  9      81        72 
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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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