Supercell over Laramie
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Wyoming Snow Precipitation Update

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 SATURDAY: APRIL 22 , 2017 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7030 21.3 11.5 185 40.7 21.9 186 Black Bear 8170 48.2 36.9 131 56.4 40.2 140 Blind Bull Sum 8650 44.5 24.2 184 37.3 20.4 183 Cottonwood Creek 7670 27.6 18.1 152 40.5 26.1 155 East Rim Divide 7930 11.7 9.4 124 21.5 12.3 175 Grand Targhee 9260 51.9 42.5 122 46.1 32.9 140 Granite Creek 6770 22.4 10.3 217 36.9 20.4 181 Grassy Lake 7265 37.3 30.8 121 57.7 37.7 153 Gros Ventre Summit 8750 -M 13.0 * -M 13.8 * Gunsight Pass 9820 24.2 13.7 177 26.3 15.0 175 Lewis Lake Divide 7850 46.5 30.6 152 57.6 37.1 155 Phillips Bench 8200 39.1 25.3 155 48.2 29.4 164 Salt River Summit 7760 17.5 9.2 190 30.0 17.5 171 Snake River Station 6920 14.9 11.1 134 37.3 23.7 157 Spring Creek Divide 9000 42.1 23.6 178 41.8 25.0 167 Thumb Divide 7980 20.7 14.4 144 29.1 19.8 147 Togwotee Pass 9580 34.9 24.2 144 40.6 25.9 157 Two Ocean Plateau 9240 -M 28.5 * -M 28.8 * Willow Creek 8380 27.9 26.6 105 53.1 35.6 149 Younts Peak 8350 24.6 15.2 162 32.2 16.8 192 ----- ----- Basin Index (%) 148 160 MADISON-GALLATIN Black Bear 8170 48.2 36.9 131 56.4 40.2 140 Canyon 7870 17.5 12.1 145 26.6 17.2 155 Madison Plateau 7750 28.1 22.9 123 37.9 27.7 137 West Yellowstone 6700 1.8 6.5 28 24.1 15.2 159 Whiskey Creek 6800 12.4 15.4 81 27.9 21.4 130 ----- ----- Basin Index (%) 115 142 YELLOWSTONE Beartooth Lake 9360 34.5 23.6 146 29.5 20.9 141 Burnt Mtn 5880 .2 .0 * 15.5 14.5 107 Canyon 7870 17.5 12.1 145 26.6 17.2 155 Cole Creek 7850 12.5 16.4 76 10.0 14.8 68 Evening Star 9200 39.8 24.6 162 47.0 29.0 162 Fisher Creek 9100 45.5 32.8 139 50.0 33.7 148 Northeast Entrance 7350 3.7 6.0 62 21.6 13.1 165 Parker Peak 9400 39.5 21.2 186 37.0 18.9 196 Sylvan Lake 8420 25.4 20.4 125 39.7 23.8 167 Thumb Divide 7980 20.7 14.4 144 29.1 19.8 147 Two Ocean Plateau 9240 -M 28.5 * -M 28.8 * White Mill 8700 38.8 23.7 164 37.9 25.1 151 Wolverine 7650 3.2 6.6 48 22.2 13.0 171 ----- ----- Basin Index (%) 139 150 WIND RIVER Burroughs Creek 8750 20.6 -M * 28.1 -M * Castle Creek 8400 8.4 -M * 16.9 -M * Cold Springs 9630 15.7 4.1 383 20.6 11.1 186 Deer Park 9700 34.4 16.3 211 40.5 21.8 186 Hobbs Park 10100 31.6 15.1 209 30.1 15.1 199 Kirwin 9550 24.0 10.0 240 27.2 12.7 214 Little Warm 9370 18.7 10.0 187 25.6 14.0 183 Owl Creek 8975 8.7 3.5 249 14.3 7.0 204 South Pass 9040 32.0 15.4 208 30.4 18.8 162 St. Lawrence Alt 8620 8.4 5.1 165 18.6 10.1 184 Togwotee Pass 9580 34.9 24.2 144 40.6 25.9 157 Townsend Creek 8700 17.8 9.1 196 24.5 13.5 181 ----- ----- Basin Index (%) 201 182 BIGHORN BASIN Bald Mtn. 9380 21.4 20.0 107 18.7 18.4 102 Bear Trap Meadow 8200 5.1 2.7 189 11.7 9.6 122 Bone Springs Div 9350 21.3 16.2 131 19.3 17.0 114 Grave Springs 8550 8.4 9.4 89 10.4 11.9 87 Kirwin 9550 24.0 10.0 240 27.2 12.7 214 Marquette 8760 15.6 -M * 19.5 -M * Middle Powder 7760 10.3 12.4 83 9.8 13.0 75 Owl Creek 8975 8.7 3.5 249 14.3 7.0 204 Powder River Pass 9480 10.1 10.2 99 15.5 13.9 112 Shell Creek 9580 19.2 15.6 123 16.7 15.0 111 Timber Creek 7950 7.2 4.4 164 13.0 8.6 151 ----- ----- Basin Index (%) 130 123 SHOSHONE RIVER Blackwater 9780 39.9 24.0 166 44.3 22.0 201 Evening Star 9200 39.8 24.6 162 47.0 29.0 162 Marquette 8760 15.6 -M * 19.5 -M * Sylvan Road 7120 .0 9.2 0 31.7 17.8 178 Younts Peak 8350 24.6 15.2 162 32.2 16.8 192 ----- ----- Basin Index (%) 143 181 POWDER RIVER Bear Trap Meadow 8200 5.1 2.7 189 11.7 9.6 122 Cloud Peak Reservoir 9860 18.6 16.0 116 22.2 15.2 146 Grave Springs 8550 8.4 9.4 89 10.4 11.9 87 Hansen Sawmill 8360 12.3 4.5 273 17.4 9.8 178 Middle Powder 7760 10.3 12.4 83 9.8 13.0 75 Powder River Pass 9480 10.1 10.2 99 15.5 13.9 112 Soldier Park 8720 15.6 -M * 17.1 -M * ----- ----- Basin Index (%) 117 119 TONGUE RIVER Big Goose 7990 12.3 9.2 134 15.9 12.9 123 Bone Springs Div 9350 21.3 16.2 131 19.3 17.0 114 Burgess Junction 7880 11.1 12.7 87 13.0 13.7 95 Dome Lake 8880 16.9 11.8 143 18.3 15.1 121 Little Goose 8870 15.2 -M * 19.8 -M * Sucker Creek 8880 13.6 12.7 107 15.4 16.0 96 Tie Creek 6870 .2 4.1 5 14.9 13.1 114 ----- ----- Basin Index (%) 113 110 BELLE FOURCHE Cole Canyon 5910 .0 1.6 0 8.8 10.6 83 ----- ----- Basin Index (%) 0 83 CHEYENNE RIVER BASIN Blind Park 6890 .0 3.9 0 10.3 13.3 77 North Rapid Creek 6130 .0 3.9 0 8.8 11.3 78 ----- ----- Basin Index (%) 0 78 UPPER N. PLATTE Arapaho Ridge 10960 24.6 21.4 115 27.5 24.5 112 Blackhall Mtn 9820 34.4 -M * 38.8 -M * Columbine 9160 10.9 20.6 53 28.6 27.2 105 Divide Peak 8880 10.9 18.4 59 23.6 23.0 103 Joe Wright 10120 17.0 22.5 76 30.5 28.1 109 Laprele Creek 8375 6.7 7.7 87 13.5 13.9 97 Med Bow 10500 35.9 -M * 36.9 -M * North French Creek 10130 24.6 32.1 77 29.4 28.9 102 Never Summer 10280 23.3 20.8 112 21.0 -M * Old Battle 10000 36.8 33.2 111 39.4 37.4 105 Rawah 9020 5.3 8.2 65 18.8 15.7 120 Sage Creek Basin 7850 -M 4.9 * 17.0 15.3 111 Sand Lake 10050 30.5 30.6 100 29.0 27.1 107 South Brush Creek 8440 .8 9.7 8 13.3 16.7 80 Tower 10500 39.8 48.5 82 45.6 42.5 107 Webber Springs 9250 22.5 21.8 103 34.2 28.6 120 Willow Creek Pass 9540 18.2 13.4 136 19.3 14.6 132 Zirkel 9340 23.2 22.6 103 43.4 29.9 145 ----- ----- Basin Index (%) 89 111 SWEETWATER Deer Park 9700 34.4 16.3 211 40.5 21.8 186 Larsen Creek 9000 12.9 10.1 128 24.7 -M * South Pass 9040 32.0 15.4 208 30.4 18.8 162 ----- ----- Basin Index (%) 190 175 LOWER N. PLATTE Casper Mtn. 7900 9.9 14.3 69 14.6 16.8 87 Laprele Creek 8375 6.7 7.7 87 13.5 13.9 97 Reno Hill 8400 12.1 14.0 86 16.1 17.4 93 Windy Peak 7900 4.4 6.4 69 12.8 11.8 108 ----- ----- Basin Index (%) 78 95 LARAMIE RIVER Brooklyn Lake 10240 19.7 22.4 88 23.9 23.1 103 Cinnabar Park 9574 12.7 19.9 64 23.4 25.7 91 Crow Creek 8330 1.5 .4 375* 11.0 12.1 91 Deadman Hill 10220 20.5 17.4 118 22.3 19.2 116 Rawah 9020 5.3 8.2 65 18.8 15.7 120 Roach 9700 14.8 16.6 89 22.3 20.9 107 ----- ----- Basin Index (%) 88 104 S. PLATTE Black Mountain 8920 8.2 -M * 14.5 -M * Crow Creek 8330 1.5 .4 375* 11.0 12.1 91 Deadman Hill 10220 20.5 17.4 118 22.3 19.2 116 ----- ----- Basin Index (%) 124* 106 LITTLE SNAKE RIVER Battle Mountain 7440 .0 3.5 0 17.8 16.2 110 Divide Peak 8880 10.9 18.4 59 23.6 23.0 103 Elk River 8700 5.5 15.0 37 21.2 21.5 99 Little Snake River 8915 21.4 23.8 90 40.1 31.2 129 Old Battle 10000 36.8 33.2 111 39.4 37.4 105 Sage Creek Basin 7850 -M 4.9 * 17.0 15.3 111 Sandstone RS 8150 .1 9.8 1 16.2 19.7 82 Whiskey Park 8950 21.7 25.7 84 31.7 29.9 106 ----- ----- Basin Index (%) 74 107 UPPER GREEN RIVER Big Sandy Opening 9080 21.9 12.4 177 24.6 14.3 172 Blind Bull Sum 8650 44.5 24.2 184 37.3 20.4 183 East Rim Divide 7930 11.7 9.4 124 21.5 12.3 175 Elkhart Park G.S. 9400 19.8 11.9 166 25.2 14.2 177 Gros Ventre Summit 8750 -M 13.0 * -M 13.8 * Gunsight Pass 9820 24.2 13.7 177 26.3 15.0 175 Kendall R.S. 7740 16.1 7.7 209 29.7 14.8 201 Loomis Park 8240 24.5 12.5 196 33.0 18.1 182 New Fork Lake 8340 12.9 8.3 155 18.7 11.4 164 Pocket Creek 9360 -M -M * -M -M * Snider Basin 8060 15.8 10.5 150 28.1 14.9 189 Spring Creek Divide 9000 42.1 23.6 178 41.8 25.0 167 Triple Peak 8500 35.5 19.2 185 42.5 26.6 160 ----- ----- Basin Index (%) 175 176 LOWER GREEN RIVER Blacks Fork Jct 8869 5.0 -M * 17.3 -M * Buck Pasture 9632 15.4 -M * 25.0 -M * EF Blacks Fork GS 9360 11.7 -M * 19.0 -M * Hams Fork 7840 11.0 6.0 183 22.6 12.2 185 Hewinta 9500 6.9 7.6 91 18.9 15.2 124 Hickerson Park 9122 5.3 5.2 102 13.6 11.2 121 Hole-in-Rock 9168 5.5 5.6 98 14.5 10.7 136 Indian Creek 9425 41.1 23.5 175 42.7 23.8 179 Kelley R.S. 8180 23.7 12.2 194 31.9 19.1 167 Spirit Lk 10235 15.1 -M * 19.6 -M * Steel Creek Park 10158 20.3 16.3 125 22.9 18.0 127 ----- ----- Basin Index (%) 149 152 UPPER BEAR RIVER Bear River RS 8777 2.6 -M * 19.9 -M * Bug Lake 7987 31.9 16.6 192 35.6 20.6 173 Burts Miller Ranch 8000 .0 -M * 11.1 -M * Chalk Creek #1 9171 32.0 24.5 131 38.4 27.1 142 Hayden Fork 9130 14.8 11.2 132 31.4 22.6 139 Kelley R.S. 8180 23.7 12.2 194 31.9 19.1 167 Lily Lake 9133 11.8 10.2 116 21.5 18.5 116 Monte Cristo 8932 36.1 27.3 132 41.8 27.7 151 Salt River Summit 7760 17.5 9.2 190 30.0 17.5 171 ----- ----- Basin Index (%) 151 151 ----------------------------------------------------------------------------- -M = Missing data * = Data may not provide a valid measure of conditions. Units = inches for the Current and Normal Snow Water Equivalent and Total Precipitation values If the Basin Index (%) value is flagged as potentially invalid, care should be taken to evaluate if the value is representative of conditions in the basin. 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 TOTAL 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. Contact your state water supply staff for assistance. 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. ---------------------------------------------------------------------------- -M = Missing data * = Data may not provide a valid measure of conditions. Units = inches for the Current and Normal Snow Water Equivalent and Total Precipitation values If the Basin Index (%) value is flagged as potentially invalid, care should be taken to evaluate if the value is representative of conditions in the basin. 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 TOTAL 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. Contact your state water supply staff for assistance. 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.