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 14, 2012 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 14, 20121 ---------------------------------------------------------------------------- STATE PERCENT OF AVERAGE RIVER BASIN Number Snow Water Accum of Sites Equivalent Precip --------------------------------------------------------------------------- ALASKA ANCHORAGE/SHIP CREEK BASIN ................... 4 of 4 135 129 SUSITNA BASIN ................................ 6 of 6 63 103 NORTHERN KENAI MOUNTAINS ..................... 6 of 7 148 118 SOUTHERN KENAI ............................... 6 of 6 190 94 COPPER BASIN ................................. 4 of 4 216 115 PRINCE WILLIAM SOUND ......................... 5 of 6 * 121 CHENA BASIN .................................. 7 of 7 56 70 UPPER TANANA ................................. 4 of 4 * 123 KOYUKUK BASIN ................................ 3 of 4 92 96 CENTRAL YUKON BASIN .......................... 4 of 4 * 82 SEWARD PENINSULA ............................. 2 of 2 * 79 KUPARUK-SAGAVANIRKTOK RIVER BASIN ............ 3 of 3 * 80 NORTHWEST ARCTIC RIVER BASIN ................. 1 of 1 * * SOUTHEAST ALASKA BASIN ....................... 2 of 2 103 107 ARIZONA VERDE RIVER BASIN ............................ 5 of 9 * 75 SAN FRANCISCO PEAKS .......................... 1 of 1 0 53 CENTRAL MOGOLLON RIM ......................... 3 of 4 17* 75 LITTLE COLORADO - SOUTHERN HEADWATERS ........ 5 of 6 11* 77 UPPER SALT RIVER BASIN / WHITE MOUNTAINS ..... 6 of 8 0* 68 SAN FRANCISCO / UPPER GILA RIVER BASIN ....... 6 of 8 10* 66 CALIFORNIA NORTHERN GREAT BASIN ......................... 4 of 5 41* 68 TRUCKEE RIVER ................................ 7 of 8 31 69 LAKE TAHOE ................................... 7 of 8 5 68 CARSON RIVER ................................. 5 of 9 3* 58 WALKER RIVER ................................. 5 of 6 20 54 KLAMATH ...................................... 16 of 18 60* 92 COLORADO GUNNISON RIVER BASIN ......................... 11 of 16 11 72 UPPER COLORADO RIVER BASIN ................... 23 of 31 13 66 SOUTH PLATTE RIVER BASIN ..................... 15 of 20 18 74 LARAMIE AND NORTH PLATTE RIVER BASINS ........ 9 of 12 16 70 YAMPA AND WHITE RIVER BASINS ................. 16 of 20 19 67 ARKANSAS RIVER BASIN ......................... 5 of 9 24 82 UPPER RIO GRANDE BASIN ....................... 8 of 16 16* 91 SAN MIGUEL, DOLORES, ANIMAS AND SAN JUAN RIVER BASIN .................. 13 of 17 16 80 IDAHO NORTHERN PANHANDLE REGION .................... 7 of 10 143 113 SPOKANE RIVER BASIN .......................... 9 of 10 111 106 CLEARWATER BASIN ............................. 14 of 16 99 106 SALMON BASIN ................................. 22 of 22 72 100 WEISER BASIN ................................. 3 of 4 25 110 PAYETTE BASIN ................................ 9 of 11 87 103 BOISE BASIN .................................. 9 of 10 77 109 BIG WOOD BASIN ............................... 9 of 9 60 105 LITTLE WOOD BASIN ............................ 4 of 5 0 112 BIG LOST BASIN ............................... 4 of 5 0 111 LITTLE LOST, BIRCH BASINS .................... 4 of 4 22 99 MEDICINE LODGE, BEAVER, CAMAS BASINS ......... 4 of 4 22 93 HENRYS FORK, TETON BASINS .................... 7 of 8 75 99 SNAKE BASIN ABOVE PALISADES .................. 17 of 18 53 90 WILLOW, BLACKFOOT, PORTNEUF BASINS ........... 6 of 6 0 87 SNAKE BASIN ABOVE AMERICAN FALLS ............. 27 of 29 55 91 RAFT BASIN ................................... 1 of 2 0 97 GOOSE CREEK BASIN ............................ 2 of 2 0 97 SALMON FALLS BASIN ........................... 5 of 5 0 83 BRUNEAU BASIN ................................ 5 of 5 0 78 OWYHEE BASIN ................................. 7 of 8 2* 82 BEAR RIVER BASIN ............................. 15 of 15 12 75 MONTANA KOOTENAI RIVER BASIN ......................... 8 of 8 134 115 FLATHEAD RIVER BASIN ......................... 14 of 16 107 108 UPPER CLARK FORK RIVER BASIN ................. 14 of 15 84 99 BITTERROOT RIVER BASIN ....................... 7 of 7 82 105 LOWER CLARK FORK RIVER BASIN ................. 8 of 8 110 107 JEFFERSON RIVER BASIN ........................ 19 of 19 57 94 MADISON RIVER BASIN .......................... 11 of 11 76 103 GALLATIN RIVER BASIN ......................... 7 of 7 79 101 MISSOURI HEADWATERS .......................... 31 of 31 68 99 HEADWATERS MISSOURI MAINSTEM ................. 5 of 5 77 106 SMITH, JUDITH, AND MUSSELSHELL RIVER BASINS .. 9 of 10 88 112 SUN, TETON AND MARIAS RIVER BASINS ........... 5 of 6 84 98 MISSOURI MAINSTEM RIVER BASIN ................ 19 of 21 82 106 ST. MARY AND MILK RIVER BASINS ............... 3 of 3 107 114 UPPER YELLOWSTONE RIVER BASIN ................ 23 of 24 79 101 WIND RIVER BASIN (WYOMING) ................... 12 of 13 27 78 SHOSHONE RIVER BASIN (WYOMING) ............... 5 of 6 67 107 BIGHORN RIVER BASIN (WYOMING) ................ 15 of 16 64 100 TONGUE RIVER BASIN (WYOMING) ................. 6 of 7 42 104 POWDER RIVER BASIN (WYOMING) ................. 6 of 7 20 98 LOWER YELLOWSTONE RIVER BASIN ................ 31 of 35 47 93 NEVADA NORTHERN GREAT BASIN ......................... 4 of 5 41* 68 SNAKE RIVER .................................. 3 of 3 0 80 OWYHEE RIVER ................................. 5 of 6 2* 78 UPPER HUMBOLDT RIVER ......................... 5 of 5 0 75 LOWER HUMBOLDT RIVER ......................... 4 of 7 1 70 CLOVER VALLEY ................................ 1 of 1 0 77 EASTERN NEVADA ............................... 3 of 8 * * NEW MEXICO RIO CHAMA RIVER BASIN ........................ 3 of 4 0 72 UPPER RIO GRANDE BASIN ....................... 7 of 9 13 91 SANGRE DE CRISTO MOUNTAIN RANGE BASINS ....... 8 of 9 5* 97 JEMEZ RIVER BASIN ............................ 2 of 3 * 89 SAN FRANCISCO RIVER BASIN .................... 3 of 3 12* 62 GILA RIVER BASIN ............................. 2 of 3 12* 75 MIMBRES RIVER BASIN .......................... 1 of 2 * 88 PECOS RIVER BASIN ............................ 1 of 1 1 97 SAN JUAN RIVER HEADWATERS .................... 5 of 5 13 89 ANIMAS RIVER BASIN ........................... 6 of 7 15 76 CIMARRON RIVER BASIN ......................... 2 of 2 33* 105 ZUNI/BLUEWATER RIVER BASIN ................... 1 of 1 * 102 RIO HONDO BASIN .............................. 1 of 1 * 95 OREGON OWYHEE ....................................... 7 of 8 2* 82 MALHEUR ...................................... 3 of 3 3* 98 GRANDE RONDE, POWDER, BURNT, IMNAHA .......... 15 of 17 76 102 UMATILLA, WALLA WALLA, WILLOW ................ 7 of 8 56 97 JOHN DAY ..................................... 13 of 13 1 90 UPPER DESCHUTES, CROOKED ..................... 13 of 14 82 101 HOOD, SANDY, LOWER DESCHUTES ................. 8 of 8 141 111 COAST RANGE .................................. 1 of 2 * 89 WILLAMETTE ................................... 16 of 23 91 104 ROGUE, UMPQUA ................................ 10 of 12 77 97 KLAMATH ...................................... 16 of 18 60* 92 LAKE COUNTY, GOOSE LAKE ...................... 9 of 9 31* 82 HARNEY ....................................... 9 of 9 31* 82 UTAH RAFT RIVER ................................... 1 of 2 0 97 BEAR RIVER ................................... 17 of 24 11 76 WEBER-OGDEN RIVERS ........................... 14 of 19 2 70 PROVO R.-UTAH LAKE-JORDAN R. ................. 11 of 15 13 72 TOOELE VALLEY-VERNON CREEK ................... 3 of 3 0 75 NORTHEASTERN UINTAHS ......................... 6 of 9 9 88 DUCHESNE RIVER ............................... 12 of 13 8 72 PRICE-SAN RAFAEL ............................. 6 of 7 1 74 DIRTY DEVIL .................................. 3 of 4 9 78 SOUTH EASTERN UTAH ........................... 3 of 3 1 69 SEVIER RIVER ................................. 11 of 20 8* 82 BEAVER RIVER ................................. 2 of 2 43 70 ESCALANTE RIVER .............................. 2 of 3 18* 89 SOUTHWESTERN UTAH ............................ 7 of 11 1* 79 WASHINGTON NORTHERN PANHANDLE ........................... 7 of 10 143 113 SPOKANE ...................................... 9 of 10 111 106 UPPER COLUMBIA ............................... 5 of 6 128 99 CENTRAL COLUMBIA ............................. 6 of 8 124 106 UPPER YAKIMA ................................. 5 of 5 132 104 LOWER YAKIMA ................................. 7 of 9 145 116 LOWER SNAKE .................................. 18 of 22 96 105 LOWER COLUMBIA ............................... 17 of 22 155 108 SOUTH PUGET SOUND ............................ 7 of 10 130 102 CENTRAL PUGET SOUND .......................... 9 of 9 182 105 NORTH PUGET SOUND ............................ 6 of 12 145* 110 OLYMPIC ...................................... 2 of 4 162* 115 WYOMING SNAKE RIVER .................................. 18 of 20 60 91 MADISON-GALLATIN ............................. 5 of 5 94 112 YELLOWSTONE .................................. 13 of 13 81 100 WIND RIVER ................................... 11 of 12 24 77 BIGHORN BASIN ................................ 10 of 11 60 94 SHOSHONE RIVER ............................... 4 of 5 72 104 POWDER RIVER ................................. 6 of 7 20 98 TONGUE RIVER ................................. 6 of 7 42 104 BELLE FOURCHE ................................ 1 of 1 0 111 CHEYENNE RIVER BASIN ......................... 2 of 2 0* 89 UPPER N. PLATTE .............................. 12 of 17 27 72 SWEETWATER ................................... 2 of 3 3 67 LOWER N. PLATTE .............................. 4 of 4 0 84 LARAMIE RIVER ................................ 5 of 6 7 80 S. PLATTE .................................... 2 of 3 20 85 LITTLE SNAKE RIVER ........................... 5 of 8 31 72 UPPER GREEN RIVER ............................ 11 of 13 34 86 LOWER GREEN RIVER ............................ 7 of 11 18 83 UPPER BEAR RIVER ............................. 7 of 9 1 70 --------------------------------------------------------------------------- The Snow Water Equivalent Percent of Average represents the snow water equivalent found at selected SNOTEL sites in or near the basin compared to the average 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 1971-2000. Provisional data, subject to revision. Additional 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 SNOTEL Precipitation Maps (Western Regional Climate Center): http://www.wrcc.dri.edu/snotelanom/basinpre.html] (color) http://www.wrcc.dri.edu/snotelanom/basinpren.html (numeric) SNOTEL Snow Water Equivalent Maps (Western Regional Climate Center): http://www.wrcc.dri.edu/snotelanom/basinswe.html (color) http://www.wrcc.dri.edu/snotelanom/basinswen.html (numeric) *************************************************************************** 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