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 THURSDAY: APRIL 19 , 2018 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 18.9 12.0 158 24.6 21.7 113 Black Bear 8170 44.0 36.8 120 44.8 39.6 113 Blind Bull Sum 8650 37.3 24.0 155 21.9 20.1 109 Cottonwood Creek 7670 24.8 18.8 132 29.8 25.7 116 East Rim Divide 7930 12.0 9.6 125 13.4 12.2 110 Grand Targhee 9260 54.7 41.9 131 32.2 32.4 99 Granite Creek 6770 17.6 11.1 159 24.0 20.2 119 Grassy Lake 7265 34.4 31.5 109 39.4 37.2 106 Gros Ventre Summit 8750 17.4 13.2 132 16.8 13.6 124 Gunsight Pass 9820 19.3 13.6 142 18.4 14.8 124 Lewis Lake Divide 7850 45.5 30.3 150 -M 36.6 * Phillips Bench 8200 33.2 25.7 129 32.1 29.0 111 Salt River Summit 7640 10.1 10.0 101 14.3 17.3 83 Snake River Station 6920 18.0 11.5 157 26.1 23.4 112 Spring Creek Divide 9000 29.0 23.5 123 26.9 24.6 109 Thumb Divide 7980 21.2 14.5 146 21.2 19.6 108 Togwotee Pass 9580 36.1 23.7 152 36.7 25.5 144 Two Ocean Plateau 9240 42.5 27.9 152 31.1 28.4 110 Willow Creek 8080 38.3 26.8 143 40.4 35.1 115 Younts Peak 8350 -M 15.1 * -M 16.6 * ----- ----- Basin Index (%) 136 112 MADISON-GALLATIN Black Bear 8170 44.0 36.8 120 44.8 39.6 113 Canyon 7870 18.7 12.3 152 21.3 16.9 126 Madison Plateau 7750 29.9 22.9 131 29.7 27.4 108 West Yellowstone 6700 11.8 7.8 151 18.3 15.0 122 Whiskey Creek 6800 16.7 15.2 110 21.7 21.1 103 ----- ----- Basin Index (%) 127 113 YELLOWSTONE Beartooth Lake 9360 42.1 23.2 181 38.7 20.6 188 Burnt Mtn 5880 7.2 .0 * 16.1 14.1 114 Canyon 7870 18.7 12.3 152 21.3 16.9 126 Cole Creek 7850 16.8 16.1 104 -M 14.4 * Evening Star 9200 45.4 24.9 182 43.0 28.6 150 Fisher Creek 9100 57.1 32.3 177 51.1 33.2 154 Northeast Entrance 7350 15.3 7.0 219 19.9 12.9 154 Parker Peak 9400 37.9 20.8 182 32.5 18.6 175 Sylvan Lake 8420 28.7 20.4 141 30.7 23.4 131 Thumb Divide 7980 21.2 14.5 146 21.2 19.6 108 Two Ocean Plateau 9240 42.5 27.9 152 31.1 28.4 110 White Mill 8700 45.7 23.6 194 35.2 24.8 142 Wolverine 7650 23.7 7.5 316 23.0 12.8 180 ----- ----- Basin Index (%) 175 143 WIND RIVER Burroughs Creek 8750 18.0 -M * 19.7 -M * Castle Creek 8400 7.9 -M * 10.7 -M * Cold Springs 9630 9.5 4.9 194 10.8 10.8 100 Deer Park 9700 13.1 16.2 81 16.6 21.3 78 Hobbs Park 10100 18.9 14.8 128 16.4 14.7 112 Kirwin 9550 21.2 10.0 212 19.5 12.3 159 Little Warm 9370 17.7 10.2 174 18.8 13.8 136 Owl Creek 8975 4.5 4.2 107 7.2 6.7 107 South Pass 9040 12.3 15.6 79 -M 18.5 * St. Lawrence Alt 8620 -M 5.4 * 8.8 9.8 90 Togwotee Pass 9580 36.1 23.7 152 36.7 25.5 144 Townsend Creek 8700 7.2 9.6 75 10.0 13.1 76 ----- ----- Basin Index (%) 129 113 BIGHORN BASIN Bald Mtn. 9380 24.4 19.7 124 18.4 18.1 102 Bear Trap Meadow 8200 -M 3.5 * 11.9 9.3 128 Bone Springs Div 9350 22.5 16.2 139 17.1 16.6 103 Grave Springs 8550 8.5 9.6 89 -M 11.5 * Kirwin 9550 21.2 10.0 212 19.5 12.3 159 Marquette 8760 7.4 -M * 11.2 -M * Middle Powder 7760 10.9 12.5 87 -M 12.7 * Owl Creek 8975 4.5 4.2 107 7.2 6.7 107 Powder River Pass 9480 17.4 10.2 171 17.2 13.6 126 Shell Creek 9580 23.5 15.3 154 17.9 14.8 121 Timber Creek 7950 1.4 4.9 29 -M 8.4 * ----- ----- Basin Index (%) 131 119 SHOSHONE RIVER Blackwater 9780 37.6 23.8 158 35.2 21.7 162 Evening Star 9200 45.4 24.9 182 43.0 28.6 150 Marquette 8760 7.4 -M * 11.2 -M * Sylvan Road 7120 15.3 10.0 153 24.6 17.5 141 Younts Peak 8350 -M 15.1 * -M 16.6 * ----- ----- Basin Index (%) 167 152 POWDER RIVER Bear Trap Meadow 8200 -M 3.5 * 11.9 9.3 128 Cloud Peak Reservoir 9860 18.1 15.7 115 16.3 14.7 111 Grave Springs 8550 8.5 9.6 89 -M 11.5 * Hansen Sawmill 8360 9.7 5.0 194 11.8 9.5 124 Middle Powder 7760 10.9 12.5 87 -M 12.7 * Powder River Pass 9480 17.4 10.2 171 17.2 13.6 126 Soldier Park 8720 8.4 -M * 11.4 -M * ----- ----- Basin Index (%) 122 121 TONGUE RIVER Big Goose 7990 9.7 9.4 103 10.6 12.5 85 Bone Springs Div 9350 22.5 16.2 139 17.1 16.6 103 Burgess Junction 7880 11.9 12.4 96 10.4 13.4 78 Dome Lake 8880 17.2 11.8 146 14.4 14.8 97 Little Goose 8870 11.8 -M * 14.4 -M * Sucker Creek 8880 13.3 12.7 105 11.4 15.6 73 Tie Creek 6870 5.6 4.5 124 11.0 12.7 87 ----- ----- Basin Index (%) 120 88 BELLE FOURCHE Cole Canyon 5910 7.4 2.2 336 11.9 10.3 116 ----- ----- Basin Index (%) 336 116 CHEYENNE RIVER BASIN Blind Park 6890 7.7 4.2 183 13.2 12.8 103 North Rapid Creek 6130 6.5 4.4 148 10.4 10.6 98 ----- ----- Basin Index (%) 165 101 UPPER N. PLATTE Arapaho Ridge 10960 23.1 21.4 108 22.8 24.3 94 Blackhall Mtn 9820 30.1 -M * 29.7 -M * Columbine 9160 24.7 20.7 119 28.1 26.8 105 Divide Peak 8880 14.8 19.1 77 19.8 22.7 87 Joe Wright 10120 23.2 22.2 105 33.1 27.6 120 Laprele Creek 8375 6.3 8.3 76 9.5 13.5 70 Med Bow 10500 39.5 -M * 37.5 -M * North French Creek 10130 31.8 32.0 99 30.8 28.3 109 Never Summer 10280 22.1 20.6 107 18.1 -M * Old Battle 10000 27.9 32.5 86 26.4 36.8 72 Rawah 9020 10.9 8.6 127 16.6 15.5 107 Sage Creek Basin 7850 3.8 6.6 58 11.4 15.2 75 Sand Lake 10050 30.4 30.4 100 25.9 26.6 97 South Brush Creek 8440 9.2 9.9 93 13.4 16.3 82 Tower 10500 43.3 47.8 91 -M 41.8 * Webber Springs 9250 18.9 22.3 85 23.4 28.2 83 Willow Creek Pass 9540 14.3 12.9 111 15.6 14.3 109 Zirkel 9340 26.6 22.8 117 34.2 29.7 115 ----- ----- Basin Index (%) 98 95 SWEETWATER Deer Park 9700 13.1 16.2 81 16.6 21.3 78 Larsen Creek 9000 10.3 10.4 99 11.9 -M * South Pass 9040 12.3 15.6 79 -M 18.5 * ----- ----- Basin Index (%) 85 78* LOWER N. PLATTE Casper Mtn. 7900 8.9 14.5 61 7.9 16.4 48 Laprele Creek 8375 6.3 8.3 76 9.5 13.5 70 Reno Hill 8400 11.3 14.0 81 13.4 16.9 79 Windy Peak 7900 6.3 6.7 94 9.6 11.5 83 ----- ----- Basin Index (%) 75 69 LARAMIE RIVER Brooklyn Lake 10240 27.8 22.1 126 27.8 22.6 123 Cinnabar Park 9574 22.7 20.3 112 26.8 25.3 106 Crow Creek 8330 2.6 1.1 236 12.1 12.0 101 Deadman Hill 10220 22.7 16.8 135 21.5 18.7 115 Rawah 9020 10.9 8.6 127 16.6 15.5 107 Roach 9700 14.7 16.5 89 18.5 20.4 91 ----- ----- Basin Index (%) 119 108 S. PLATTE Black Mountain 8920 10.6 -M * 14.5 -M * Crow Creek 8330 2.6 1.1 236 12.1 12.0 101 Deadman Hill 10220 22.7 16.8 135 21.5 18.7 115 ----- ----- Basin Index (%) 141 109 LITTLE SNAKE RIVER Battle Mountain 7440 2.7 4.9 55 12.2 16.0 76 Divide Peak 8880 14.8 19.1 77 19.8 22.7 87 Elk River 8700 14.6 15.8 92 18.5 21.1 88 Little Snake River 8915 22.5 24.7 91 30.6 31.2 98 Old Battle 10000 27.9 32.5 86 26.4 36.8 72 Sage Creek Basin 7850 3.8 6.6 58 11.4 15.2 75 Sandstone RS 8150 7.2 10.4 69 11.0 19.4 57 Whiskey Park 8950 26.3 26.0 101 28.3 29.5 96 ----- ----- Basin Index (%) 86 82 UPPER GREEN RIVER Big Sandy Opening 9080 13.7 12.7 108 13.9 14.0 99 Blind Bull Sum 8650 37.3 24.0 155 21.9 20.1 109 East Rim Divide 7930 12.0 9.6 125 13.4 12.2 110 Elkhart Park G.S. 9400 13.6 11.9 114 13.0 14.0 93 Gros Ventre Summit 8750 17.4 13.2 132 16.8 13.6 124 Gunsight Pass 9820 19.3 13.6 142 18.4 14.8 124 Kendall R.S. 7740 13.3 8.8 151 16.8 14.7 114 Loomis Park 8240 18.3 13.1 140 20.2 17.9 113 New Fork Lake 8340 11.0 9.0 122 12.4 11.2 111 Pocket Creek 9360 9.6 -M * 10.0 -M * Snider Basin 8060 10.4 10.9 95 15.9 14.7 108 Spring Creek Divide 9000 29.0 23.5 123 26.9 24.6 109 Triple Peak 8500 35.5 19.3 184 34.9 26.2 133 ----- ----- Basin Index (%) 136 113 LOWER GREEN RIVER Blacks Fork Jct 8869 5.9 -M * 10.2 -M * Buck Pasture 9632 12.5 -M * 15.3 -M * EF Blacks Fork GS 9360 10.6 -M * -M -M * Hams Fork 7840 7.4 7.1 104 10.5 11.9 88 Hewinta 9500 6.8 8.3 82 12.5 14.9 84 Hickerson Park 9122 3.1 5.6 55 8.4 11.0 76 Hole-in-Rock 9168 5.3 6.0 88 9.0 10.5 86 Indian Creek 9425 24.9 23.2 107 17.8 23.5 76 Kelley R.S. 8180 14.2 12.9 110 16.2 18.8 86 Spirit Lk 10235 10.2 -M * 12.5 -M * Steel Creek Park 10158 15.6 16.2 96 15.7 17.6 89 ----- ----- Basin Index (%) 97 83 UPPER BEAR RIVER Bear River RS 8777 2.5 -M * 11.6 -M * Bug Lake 7987 14.4 17.6 82 17.9 20.2 89 Burts Miller Ranch 8000 .1 -M * 6.6 -M * Chalk Creek #1 9171 15.5 24.7 63 18.0 26.6 68 Hayden Fork 9130 9.2 12.2 75 18.0 22.3 81 Kelley R.S. 8180 14.2 12.9 110 16.2 18.8 86 Lily Lake 9133 9.6 11.0 87 13.3 18.2 73 Monte Cristo 8932 24.1 27.6 87 24.3 27.2 89 Salt River Summit 7640 10.1 10.0 101 14.3 17.3 83 ----- ----- Basin Index (%) 84 81 ----------------------------------------------------------------------------- -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.