United States Natural Resources National Water and Department of Conservation Climate Center Agriculture Service Portland, Oregon WEEKLY SNOTEL SNOWPACK AND PRECIPITATION REPORT As of Monday, May 20, 2013 The National Water and Climate Center creates and transmits the weekly Western US Basin snowpack and cumulative precipitation report every Monday. This report is based on an analysis of data collected at over 800 NRCS SNOTEL sites in the Western United States. A narrative description of significant changes and events will be included in this report as conditions warrant. Please contact us if you have any questions or comments. WEEKLY SNOTEL SNOWPACK AND PRECIPITATION REPORT As of Monday, May 20, 2013 --------------------------------------------------------------------------- STATE % MEDIAN % AVE RIVER BASIN Number Snow Water Accum of Sites Equivalent Precip --------------------------------------------------------------------------- ALASKA ANCHORAGE/SHIP CREEK BASIN ................... 4 of 4 152 102 SUSITNA BASIN ................................ 4 of 6 399* 121 NORTHERN KENAI MOUNTAINS ..................... 7 of 7 151* 77 SOUTHERN KENAI ............................... 3 of 6 362* 71 COPPER BASIN ................................. 3 of 4 265 94 PRINCE WILLIAM SOUND ......................... 0 of 6 * 100 CHENA BASIN .................................. 7 of 7 936* 101 UPPER TANANA ................................. 2 of 4 * 91 KOYUKUK BASIN ................................ 2 of 4 * 67 CENTRAL YUKON BASIN .......................... 0 of 4 * 100 SEWARD PENINSULA ............................. 0 of 2 * 68 KUPARUK-SAGAVANIRKTOK RIVER BASIN ............ 0 of 3 * 107 NORTHWEST ARCTIC RIVER BASIN ................. 0 of 1 * * SOUTHEAST ALASKA BASIN ....................... 1 of 2 184 99 ARIZONA VERDE RIVER BASIN ............................ 3 of 10 * * SAN FRANCISCO PEAKS .......................... 0 of 1 * * CENTRAL MOGOLLON RIM ......................... 3 of 4 * * LITTLE COLORADO - SOUTHERN HEADWATERS ........ 5 of 6 * * UPPER SALT RIVER BASIN / WHITE MOUNTAINS ..... 6 of 8 * * SAN FRANCISCO / UPPER GILA RIVER BASIN ....... 7 of 8 * * CHUSKA MOUNTAINS ............................. 0 of 2 * * CALIFORNIA NORTHERN GREAT BASIN ......................... 3 of 5 4* 74 TRUCKEE RIVER ................................ 8 of 8 24* 74 LAKE TAHOE ................................... 8 of 8 0* 84 CARSON RIVER ................................. 9 of 9 0* 74 WALKER RIVER ................................. 6 of 6 45 75 KLAMATH ...................................... 16 of 18 13* 86 COLORADO GUNNISON RIVER BASIN ......................... 13 of 16 62* 77 UPPER COLORADO RIVER BASIN ................... 27 of 31 101* 91 SOUTH PLATTE RIVER BASIN ..................... 15 of 20 117 95 LARAMIE AND NORTH PLATTE RIVER BASINS ........ 11 of 12 73 95 YAMPA AND WHITE RIVER BASINS ................. 19 of 20 70 86 ARKANSAS RIVER BASIN ......................... 7 of 9 71* 75 UPPER RIO GRANDE BASIN ....................... 11 of 16 24* 68 SAN MIGUEL, DOLORES, ANIMAS AND SAN JUAN RIVER BASIN .................. 16 of 18 24* 68 IDAHO NORTHERN PANHANDLE REGION .................... 10 of 10 85 110 SPOKANE RIVER BASIN .......................... 10 of 10 73 100 CLEARWATER BASIN ............................. 15 of 16 75 99 SALMON BASIN ................................. 22 of 22 45 88 WEISER BASIN ................................. 4 of 4 0* 91 PAYETTE BASIN ................................ 11 of 11 22 89 BOISE BASIN .................................. 10 of 10 34 80 BIG WOOD BASIN ............................... 9 of 9 46 84 LITTLE WOOD BASIN ............................ 5 of 5 32 83 BIG LOST BASIN ............................... 4 of 5 28 83 LITTLE LOST, BIRCH BASINS .................... 3 of 4 55 82 MEDICINE LODGE, BEAVER, CAMAS BASINS ......... 4 of 4 47 82 HENRYS FORK, TETON BASINS .................... 8 of 8 53 89 SNAKE BASIN ABOVE PALISADES .................. 18 of 18 56 88 WILLOW, BLACKFOOT, PORTNEUF BASINS ........... 6 of 6 0* 90 SNAKE BASIN ABOVE AMERICAN FALLS ............. 29 of 29 58 89 RAFT BASIN ................................... 1 of 2 0 90 GOOSE CREEK BASIN ............................ 2 of 2 * 93 SALMON FALLS BASIN ........................... 5 of 5 40* 91 BRUNEAU BASIN ................................ 5 of 5 40* 87 OWYHEE BASIN ................................. 8 of 8 * 79 BEAR RIVER BASIN ............................. 15 of 15 41 84 MONTANA KOOTENAI RIVER BASIN ......................... 8 of 8 83 110 FLATHEAD RIVER BASIN ......................... 13 of 16 93 112 UPPER CLARK FORK RIVER BASIN ................. 13 of 15 62 90 BITTERROOT RIVER BASIN ....................... 7 of 7 54 95 LOWER CLARK FORK RIVER BASIN ................. 8 of 8 74 105 JEFFERSON RIVER BASIN ........................ 19 of 19 55 85 MADISON RIVER BASIN .......................... 11 of 11 61 88 GALLATIN RIVER BASIN ......................... 7 of 7 72 97 MISSOURI HEADWATERS .......................... 31 of 31 58 88 HEADWATERS MISSOURI MAINSTEM ................. 5 of 5 46 96 SMITH, JUDITH, AND MUSSELSHELL RIVER BASINS .. 9 of 10 54 96 SUN, TETON AND MARIAS RIVER BASINS ........... 5 of 6 83* 105 MISSOURI MAINSTEM RIVER BASIN ................ 19 of 21 62* 100 ST. MARY AND MILK RIVER BASINS ............... 3 of 3 105* 120 UPPER YELLOWSTONE RIVER BASIN ................ 23 of 24 62 91 WIND RIVER BASIN (WYOMING) ................... 12 of 13 49 78 SHOSHONE RIVER BASIN (WYOMING) ............... 5 of 6 57 95 BIGHORN RIVER BASIN (WYOMING) ................ 15 of 16 60 93 TONGUE RIVER BASIN (WYOMING) ................. 6 of 7 62 82 POWDER RIVER BASIN (WYOMING) ................. 6 of 7 67 96 LOWER YELLOWSTONE RIVER BASIN ................ 31 of 35 58 86 NEVADA NORTHERN GREAT BASIN ......................... 3 of 5 4* 74 SNAKE RIVER .................................. 3 of 3 40 85 OWYHEE RIVER ................................. 5 of 6 * 78 UPPER HUMBOLDT RIVER ......................... 5 of 5 0* 74 LOWER HUMBOLDT RIVER ......................... 5 of 7 0* 76 CLOVER VALLEY ................................ 1 of 1 0* 66 EASTERN NEVADA ............................... 3 of 8 * * NEW MEXICO RIO CHAMA RIVER BASIN ........................ 2 of 4 * 61 UPPER RIO GRANDE BASIN ....................... 8 of 9 19 68 SANGRE DE CRISTO MOUNTAIN RANGE BASINS ....... 9 of 9 4* 62 JEMEZ RIVER BASIN ............................ 2 of 3 * 53 SAN FRANCISCO RIVER BASIN .................... 3 of 3 * * GILA RIVER BASIN ............................. 3 of 3 * 52 MIMBRES RIVER BASIN .......................... 2 of 2 * 46 PECOS RIVER BASIN ............................ 1 of 1 5 54 SAN JUAN RIVER HEADWATERS .................... 5 of 5 20 70 ANIMAS RIVER BASIN ........................... 7 of 7 20 65 CIMARRON RIVER BASIN ......................... 2 of 2 * 63 ZUNI/BLUEWATER RIVER BASIN ................... 1 of 1 * * RIO HONDO BASIN .............................. 0 of 1 * 50 CHUSKA MOUNTAINS ............................. 0 of 1 * * OREGON OWYHEE ....................................... 8 of 8 * 79 MALHEUR ...................................... 3 of 3 * 82 GRANDE RONDE, POWDER, BURNT, IMNAHA .......... 16 of 17 54* 93 UMATILLA, WALLA WALLA, WILLOW ................ 6 of 8 1* 95 JOHN DAY ..................................... 12 of 13 * 86 UPPER DESCHUTES, CROOKED ..................... 13 of 14 44* 90 HOOD, SANDY, LOWER DESCHUTES ................. 7 of 8 54 100 COAST RANGE .................................. 1 of 2 * 88 WILLAMETTE ................................... 18 of 23 43* 93 ROGUE, UMPQUA ................................ 12 of 12 32 91 KLAMATH ...................................... 16 of 18 13* 86 LAKE COUNTY, GOOSE LAKE ...................... 8 of 9 5* 82 HARNEY ....................................... 9 of 9 1* 82 UTAH RAFT RIVER ................................... 1 of 2 0 90 BEAR RIVER ................................... 18 of 24 34* 83 WEBER-OGDEN RIVERS ........................... 17 of 20 38* 80 PROVO R.-UTAH LAKE-JORDAN R. ................. 15 of 17 37* 79 TOOELE VALLEY-VERNON CREEK ................... 3 of 4 86* 81 NORTHEASTERN UINTAHS ......................... 6 of 10 77* 93 DUCHESNE RIVER ............................... 12 of 13 76* 79 PRICE-SAN RAFAEL ............................. 6 of 10 38* 83 DIRTY DEVIL .................................. 3 of 4 * 79 SOUTH EASTERN UTAH ........................... 3 of 5 * 79 UPPER SEVIER RIVER ........................... 13 of 17 59* 81 SAN PITCH RIVER .............................. 5 of 11 * * LOWER SEVIER RIVER ........................... 1 of 3 * * BEAVER RIVER ................................. 2 of 2 75 78 ESCALANTE RIVER .............................. 3 of 3 * 84 SOUTHWESTERN UTAH ............................ 9 of 12 6* 70 WASHINGTON NORTHERN PANHANDLE ........................... 10 of 10 85 110 SPOKANE ...................................... 10 of 10 73 100 UPPER COLUMBIA ............................... 5 of 6 88* 107 CENTRAL COLUMBIA ............................. 7 of 8 87* 99 UPPER YAKIMA ................................. 5 of 5 82 100 LOWER YAKIMA ................................. 7 of 9 73 98 LOWER SNAKE .................................. 21 of 22 73 98 LOWER COLUMBIA ............................... 16 of 22 98 103 SOUTH PUGET SOUND ............................ 7 of 10 110* 107 CENTRAL PUGET SOUND .......................... 8 of 9 136 111 NORTH PUGET SOUND ............................ 7 of 12 104 107 OLYMPIC ...................................... 3 of 4 119 100 WYOMING SNAKE RIVER .................................. 20 of 20 60 88 MADISON-GALLATIN ............................. 5 of 5 50 84 YELLOWSTONE .................................. 13 of 13 64 90 WIND RIVER ................................... 11 of 12 51 78 BIGHORN BASIN ................................ 10 of 11 63 92 SHOSHONE RIVER ............................... 4 of 5 63 94 POWDER RIVER ................................. 6 of 7 67 96 TONGUE RIVER ................................. 6 of 7 62 82 BELLE FOURCHE ................................ 1 of 1 * 83 CHEYENNE RIVER BASIN ......................... 2 of 2 * 93 UPPER N. PLATTE .............................. 14 of 18 75 88 SWEETWATER ................................... 2 of 3 27 62 LOWER N. PLATTE .............................. 4 of 4 31 77 LARAMIE RIVER ................................ 6 of 6 77 88 S. PLATTE .................................... 2 of 3 87* 91 LITTLE SNAKE RIVER ........................... 7 of 8 65* 81 UPPER GREEN RIVER ............................ 12 of 13 53 83 LOWER GREEN RIVER ............................ 7 of 11 64* 88 UPPER BEAR RIVER ............................. 7 of 9 41* 81 --------------------------------------------------------------------------- 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. Reference period for average conditions is 1981-2010. Provisional data, subject to revision. Supporting Information: Individual SNOTEL site current year graphs: http://www.wcc.nrcs.usda.gov/cgibin/site-wygraph-multi.pl SNOTEL Precipitation Maps: ftp://ftp.wcc.nrcs.usda.gov/data/water/wcs/gis/maps/west_mtdprecpctnormal_upd ate.pdf SNOTEL Snow Water Equivalent Maps: ftp://ftp.wcc.nrcs.usda.gov/data/water/wcs/gis/maps/west_swepctnormal_update. pdf *************************************************************************** You can view this report on the National Water and Climate Center Homepage: ftp://ftp.wcc.nrcs.usda.gov/data/snow/update/ws.txt For questions, comments and more information about this report please contact: Jolyne Lea - 503-414-3040, Jolyne.lea@por.usda.gov