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: MARCH 18 , 2017 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7030 26.2 14.6 179 36.8 18.9 195 Black Bear 8170 43.0 32.2 134 48.8 34.2 143 Blind Bull Sum 8650 40.4 20.3 199 -M 17.5 * Cottonwood Creek 7670 26.0 19.5 133 34.4 21.7 159 East Rim Divide 7930 18.4 9.5 194 19.8 10.5 189 Grand Targhee 9260 39.9 32.8 122 -M 26.8 * Granite Creek 6770 29.6 15.0 197 34.2 18.0 190 Grassy Lake 7265 35.9 29.1 123 49.7 32.3 154 Gros Ventre Summit 8750 -M 11.4 * -M 11.3 * Gunsight Pass 9820 19.8 11.9 166 22.1 12.0 184 Lewis Lake Divide 7850 38.5 27.5 140 50.2 31.8 158 Phillips Bench 8200 35.2 22.2 159 43.9 25.1 175 Salt River Summit 7760 20.3 11.9 171 -M 14.8 * Snake River Station 6920 20.6 15.2 136 32.6 20.2 161 Spring Creek Divide 9000 36.6 20.7 177 37.0 21.2 175 Thumb Divide 7980 21.5 13.9 155 25.5 16.3 156 Togwotee Pass 9580 30.7 20.4 150 35.0 21.5 163 Two Ocean Plateau 9240 -M 23.8 * -M 24.1 * Willow Creek 8380 30.0 25.3 119 45.1 29.6 152 Younts Peak 8350 27.1 13.2 205 29.1 14.0 208 ----- ----- Basin Index (%) 152 166 MADISON-GALLATIN Black Bear 8170 43.0 32.2 134 48.8 34.2 143 Canyon 7870 17.3 11.7 148 23.8 14.4 165 Madison Plateau 7750 25.3 20.0 126 32.7 23.4 140 West Yellowstone 6700 11.3 9.9 114 21.2 12.6 168 Whiskey Creek 6800 14.8 13.9 106 24.2 18.0 134 ----- ----- Basin Index (%) 127 147 YELLOWSTONE Beartooth Lake 9360 29.8 19.0 157 25.4 17.5 145 Burnt Mtn 5880 4.4 4.5 98 12.0 10.6 113 Canyon 7870 17.3 11.7 148 23.8 14.4 165 Cole Creek 7850 9.4 11.8 80 6.6 10.5 63 Evening Star 9200 35.6 21.9 163 41.1 24.2 170 Fisher Creek 9100 39.9 28.1 142 42.9 28.3 152 Northeast Entrance 7350 11.4 8.9 128 18.6 10.9 171 Parker Peak 9400 30.7 17.5 175 -M 15.5 * Sylvan Lake 8420 22.5 17.9 126 34.0 19.7 173 Thumb Divide 7980 21.5 13.9 155 25.5 16.3 156 Two Ocean Plateau 9240 -M 23.8 * -M 24.1 * White Mill 8700 31.7 19.7 161 32.6 21.0 155 Wolverine 7650 13.8 8.8 157 19.8 10.8 183 ----- ----- Basin Index (%) 146 153 WIND RIVER Burroughs Creek 8750 24.6 -M * 25.3 -M * Castle Creek 8400 11.7 -M * 14.3 -M * Cold Springs 9630 11.9 6.2 192 14.9 8.4 177 Deer Park 9700 27.5 12.8 215 32.1 16.9 190 Hobbs Park 10100 22.1 11.5 192 20.4 10.9 187 Kirwin 9550 18.3 8.3 220 21.0 9.8 214 Little Warm 9370 15.6 9.1 171 21.3 11.0 194 Owl Creek 8975 6.7 4.6 146 8.8 4.9 180 South Pass 9040 26.0 13.4 194 23.8 15.1 158 St. Lawrence Alt 8620 6.4 6.0 107 12.0 7.4 162 Togwotee Pass 9580 30.7 20.4 150 35.0 21.5 163 Townsend Creek 8700 12.1 8.0 151 15.9 9.9 161 ----- ----- Basin Index (%) 177 177 BIGHORN BASIN Bald Mtn. 9380 16.8 16.4 102 14.6 14.6 100 Bear Trap Meadow 8200 5.0 4.9 102 6.1 6.9 88 Bone Springs Div 9350 15.4 13.9 111 14.7 13.2 111 Grave Springs 8550 5.9 8.0 74 6.1 8.8 69 Kirwin 9550 18.3 8.3 220 21.0 9.8 214 Marquette 8760 7.2 -M * 11.8 -M * Middle Powder 7760 6.4 9.5 67 6.2 9.8 63 Owl Creek 8975 6.7 4.6 146 8.8 4.9 180 Powder River Pass 9480 7.0 9.0 78 10.3 10.6 97 Shell Creek 9580 14.3 12.7 113 11.6 11.7 99 Timber Creek 7950 5.2 4.2 124 6.9 6.0 115 ----- ----- Basin Index (%) 110 110 SHOSHONE RIVER Blackwater 9780 34.7 20.5 169 38.5 17.9 215 Evening Star 9200 35.6 21.9 163 41.1 24.2 170 Marquette 8760 7.2 -M * 11.8 -M * Sylvan Road 7120 14.6 10.3 142 28.4 15.0 189 Younts Peak 8350 27.1 13.2 205 29.1 14.0 208 ----- ----- Basin Index (%) 170 193 POWDER RIVER Bear Trap Meadow 8200 5.0 4.9 102 6.1 6.9 88 Cloud Peak Reservoir 9860 11.6 12.6 92 12.9 11.0 117 Grave Springs 8550 5.9 8.0 74 6.1 8.8 69 Hansen Sawmill 8360 7.2 5.5 131 9.3 7.0 133 Middle Powder 7760 6.4 9.5 67 6.2 9.8 63 Powder River Pass 9480 7.0 9.0 78 10.3 10.6 97 Soldier Park 8720 11.5 -M * 9.2 -M * ----- ----- Basin Index (%) 87 94 TONGUE RIVER Big Goose 7990 8.2 7.6 108 9.4 8.9 106 Bone Springs Div 9350 15.4 13.9 111 14.7 13.2 111 Burgess Junction 7880 8.2 9.4 87 9.0 10.3 87 Dome Lake 8880 12.3 10.0 123 12.0 11.2 107 Little Goose 8870 9.0 -M * 11.6 -M * Sucker Creek 8880 9.9 10.7 93 9.8 12.0 82 Tie Creek 6870 4.2 4.9 86 9.7 9.6 101 ----- ----- Basin Index (%) 103 99 BELLE FOURCHE Cole Canyon 5910 2.5 5.5 45 6.3 7.8 81 ----- ----- Basin Index (%) 45 81 CHEYENNE RIVER BASIN Blind Park 6890 3.6 7.2 50 7.8 10.4 75 North Rapid Creek 6130 4.4 6.4 69 6.4 8.5 75 ----- ----- Basin Index (%) 59 75 UPPER N. PLATTE Arapaho Ridge 10960 24.7 18.0 137 23.6 19.4 122 Blackhall Mtn 9820 34.5 -M * 34.9 -M * Columbine 9160 23.5 21.8 108 25.9 22.6 115 Divide Peak 8880 17.8 17.4 102 21.0 18.8 112 Joe Wright 10120 17.7 18.9 94 25.6 22.5 114 Laprele Creek 8375 10.8 9.0 120 10.5 10.6 99 Med Bow 10500 36.7 -M * 32.4 -M * North French Creek 10130 24.3 24.6 99 25.1 23.4 107 Never Summer 10280 21.4 17.6 122 17.2 -M * Old Battle 10000 35.4 26.2 135 36.3 31.0 117 Rawah 9020 11.1 9.2 121 15.1 11.8 128 Sage Creek Basin 7850 12.2 11.6 105 15.2 12.9 118 Sand Lake 10050 28.1 24.2 116 25.5 21.3 120 South Brush Creek 8440 8.8 11.1 79 11.5 13.1 88 Tower 10500 39.3 39.5 99 41.7 35.3 118 Webber Springs 9250 27.5 20.9 132 31.5 23.5 134 Willow Creek Pass 9540 16.3 10.8 151 17.1 11.6 147 Zirkel 9340 38.9 25.8 151 40.2 25.1 160 ----- ----- Basin Index (%) 117 121 SWEETWATER Deer Park 9700 27.5 12.8 215 32.1 16.9 190 Larsen Creek 9000 17.6 11.0 160 21.0 -M * South Pass 9040 26.0 13.4 194 23.8 15.1 158 ----- ----- Basin Index (%) 191 175 LOWER N. PLATTE Casper Mtn. 7900 10.8 12.0 90 10.4 12.5 83 Laprele Creek 8375 10.8 9.0 120 10.5 10.6 99 Reno Hill 8400 11.0 11.8 93 11.7 12.7 92 Windy Peak 7900 9.4 6.9 136 10.0 8.9 112 ----- ----- Basin Index (%) 106 95 LARAMIE RIVER Brooklyn Lake 10240 24.2 17.5 138 21.7 18.1 120 Cinnabar Park 9574 18.1 17.8 102 20.8 21.1 99 Crow Creek 8330 4.5 7.0 64 8.2 8.7 94 Deadman Hill 10220 19.6 13.7 143 18.2 14.7 124 Rawah 9020 11.1 9.2 121 15.1 11.8 128 Roach 9700 15.2 13.8 110 18.4 16.6 111 ----- ----- Basin Index (%) 117 113 S. PLATTE Black Mountain 8920 9.3 -M * 10.5 -M * Crow Creek 8330 4.5 7.0 64 8.2 8.7 94 Deadman Hill 10220 19.6 13.7 143 18.2 14.7 124 ----- ----- Basin Index (%) 116 113 LITTLE SNAKE RIVER Battle Mountain 7440 8.1 11.2 72 15.6 13.4 116 Divide Peak 8880 17.8 17.4 102 21.0 18.8 112 Elk River 8700 18.0 17.3 104 19.1 17.7 108 Little Snake River 8915 29.3 20.8 141 36.7 26.2 140 Old Battle 10000 35.4 26.2 135 36.3 31.0 117 Sage Creek Basin 7850 12.2 11.6 105 15.2 12.9 118 Sandstone RS 8150 11.5 11.8 97 15.3 16.5 93 Whiskey Park 8950 26.4 24.1 110 28.3 24.7 115 ----- ----- Basin Index (%) 113 116 UPPER GREEN RIVER Big Sandy Opening 9080 19.9 11.4 175 21.6 11.6 186 Blind Bull Sum 8650 40.4 20.3 199 -M 17.5 * East Rim Divide 7930 18.4 9.5 194 19.8 10.5 189 Elkhart Park G.S. 9400 17.8 10.5 170 22.1 11.7 189 Gros Ventre Summit 8750 -M 11.4 * -M 11.3 * Gunsight Pass 9820 19.8 11.9 166 22.1 12.0 184 Kendall R.S. 7740 22.5 11.1 203 27.5 12.8 215 Loomis Park 8240 26.8 13.2 203 30.5 15.4 198 New Fork Lake 8340 16.0 9.2 174 16.6 9.6 173 Pocket Creek 9360 -M -M * -M -M * Snider Basin 8060 18.7 10.9 172 25.5 12.7 201 Spring Creek Divide 9000 36.6 20.7 177 37.0 21.2 175 Triple Peak 8500 35.0 19.2 182 37.6 22.5 167 ----- ----- Basin Index (%) 184 186 LOWER GREEN RIVER Blacks Fork Jct 8869 9.4 -M * 13.6 -M * Buck Pasture 9632 17.6 -M * 20.7 -M * EF Blacks Fork GS 9360 15.1 -M * -M -M * Hams Fork 7840 15.8 10.2 155 18.4 10.0 184 Hewinta 9500 8.7 9.6 91 14.1 12.2 116 Hickerson Park 9122 6.9 6.6 105 8.4 8.7 97 Hole-in-Rock 9168 5.7 6.5 88 9.1 8.2 111 Indian Creek 9425 37.0 21.0 176 -M 19.8 * Kelley R.S. 8180 24.9 13.2 189 28.4 16.0 178 Spirit Lk 10235 13.0 -M * 14.7 -M * Steel Creek Park 10158 15.2 13.3 114 17.1 14.1 121 ----- ----- Basin Index (%) 142 138 UPPER BEAR RIVER Bear River RS 8777 10.1 -M * 15.4 -M * Bug Lake 7987 29.7 16.5 180 30.0 17.2 174 Burts Miller Ranch 8000 5.4 -M * 8.4 -M * Chalk Creek #1 9171 30.9 20.8 149 32.1 21.9 147 Hayden Fork 9130 20.6 14.2 145 26.7 18.3 146 Kelley R.S. 8180 24.9 13.2 189 28.4 16.0 178 Lily Lake 9133 12.9 11.4 113 16.9 14.8 114 Monte Cristo 8932 33.6 24.1 139 34.7 22.8 152 Salt River Summit 7760 20.3 11.9 171 -M 14.8 * ----- ----- Basin Index (%) 154 152 ----------------------------------------------------------------------------- -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.