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 SUNDAY: APRIL 22 , 2018 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 17.3 11.5 150 24.6 21.9 112 Black Bear 8170 43.3 36.9 117 44.8 40.2 111 Blind Bull Sum 8650 37.7 24.2 156 22.0 20.4 108 Cottonwood Creek 7670 22.8 18.1 126 29.8 26.1 114 East Rim Divide 7930 9.7 9.4 103 13.4 12.3 109 Grand Targhee 9260 54.9 42.5 129 32.4 32.9 98 Granite Creek 6770 15.8 10.3 153 24.0 20.4 118 Grassy Lake 7265 33.3 30.8 108 39.4 37.7 105 Gros Ventre Summit 8750 16.5 13.0 127 16.8 13.8 122 Gunsight Pass 9820 18.4 13.7 134 18.4 15.0 123 Lewis Lake Divide 7850 45.0 30.6 147 -M 37.1 * Phillips Bench 8200 33.1 25.3 131 32.1 29.4 109 Salt River Summit 7640 8.2 9.2 89 14.4 17.5 82 Snake River Station 6920 15.9 11.1 143 26.1 23.7 110 Spring Creek Divide 9000 29.3 23.6 124 27.1 25.0 108 Thumb Divide 7980 19.4 14.4 135 21.2 19.8 107 Togwotee Pass 9580 35.6 24.2 147 36.9 25.9 142 Two Ocean Plateau 9240 42.9 28.5 151 33.6 28.8 117 Willow Creek 8080 37.9 26.6 142 40.4 35.6 113 Younts Peak 8350 -M 15.2 * -M 16.8 * ----- ----- Basin Index (%) 133 111 MADISON-GALLATIN Black Bear 8170 43.3 36.9 117 44.8 40.2 111 Canyon 7870 18.0 12.1 149 21.3 17.2 124 Madison Plateau 7750 29.3 22.9 128 -M 27.7 * West Yellowstone 6700 9.3 6.5 143 18.3 15.2 120 Whiskey Creek 6800 16.1 15.4 105 21.8 21.4 102 ----- ----- Basin Index (%) 124 113 YELLOWSTONE Beartooth Lake 9360 42.1 23.6 178 38.8 20.9 186 Burnt Mtn 5880 5.5 .0 * 16.2 14.5 112 Canyon 7870 18.0 12.1 149 21.3 17.2 124 Cole Creek 7850 16.3 16.4 99 -M 14.8 * Evening Star 9200 44.8 24.6 182 -M 29.0 * Fisher Creek 9100 56.8 32.8 173 51.2 33.7 152 Northeast Entrance 7350 13.5 6.0 225 19.9 13.1 152 Parker Peak 9400 38.4 21.2 181 32.8 18.9 174 Sylvan Lake 8420 27.6 20.4 135 30.7 23.8 129 Thumb Divide 7980 19.4 14.4 135 21.2 19.8 107 Two Ocean Plateau 9240 42.9 28.5 151 33.6 28.8 117 White Mill 8700 45.5 23.7 192 35.3 25.1 141 Wolverine 7650 21.9 6.6 332 23.2 13.0 178 ----- ----- Basin Index (%) 171 142 WIND RIVER Burroughs Creek 8750 16.8 -M * 19.8 -M * Castle Creek 8400 6.2 -M * 10.7 -M * Cold Springs 9630 8.1 4.1 198 10.9 11.1 98 Deer Park 9700 12.5 16.3 77 16.6 21.8 76 Hobbs Park 10100 18.7 15.1 124 16.4 15.1 109 Kirwin 9550 -M 10.0 * 19.7 12.7 155 Little Warm 9370 16.9 10.0 169 18.9 14.0 135 Owl Creek 8975 2.8 3.5 80 7.2 7.0 103 South Pass 9040 11.9 15.4 77 -M 18.8 * St. Lawrence Alt 8620 -M 5.1 * 8.8 10.1 87 Togwotee Pass 9580 35.6 24.2 147 36.9 25.9 142 Townsend Creek 8700 6.4 9.1 70 10.1 13.5 75 ----- ----- Basin Index (%) 116 111 BIGHORN BASIN Bald Mtn. 9380 24.2 20.0 121 18.5 18.4 101 Bear Trap Meadow 8200 9.4 2.7 348 11.9 9.6 124 Bone Springs Div 9350 22.2 16.2 137 17.2 17.0 101 Grave Springs 8550 8.2 9.4 87 -M 11.9 * Kirwin 9550 -M 10.0 * 19.7 12.7 155 Marquette 8760 6.9 -M * 11.2 -M * Middle Powder 7760 10.7 12.4 86 -M 13.0 * Owl Creek 8975 2.8 3.5 80 7.2 7.0 103 Powder River Pass 9480 16.8 10.2 165 17.3 13.9 124 Shell Creek 9580 23.2 15.6 149 17.9 15.0 119 Timber Creek 7950 .2 4.4 5 -M 8.6 * ----- ----- Basin Index (%) 125 117 SHOSHONE RIVER Blackwater 9780 37.6 24.0 157 35.3 22.0 160 Evening Star 9200 44.8 24.6 182 -M 29.0 * Marquette 8760 6.9 -M * 11.2 -M * Sylvan Road 7120 13.2 9.2 143 24.5 17.8 138 Younts Peak 8350 -M 15.2 * -M 16.8 * ----- ----- Basin Index (%) 165 150* POWDER RIVER Bear Trap Meadow 8200 9.4 2.7 348 11.9 9.6 124 Cloud Peak Reservoir 9860 17.6 16.0 110 16.5 15.2 109 Grave Springs 8550 8.2 9.4 87 -M 11.9 * Hansen Sawmill 8360 9.2 4.5 204 11.9 9.8 121 Middle Powder 7760 10.7 12.4 86 -M 13.0 * Powder River Pass 9480 16.8 10.2 165 17.3 13.9 124 Soldier Park 8720 7.3 -M * 11.4 -M * ----- ----- Basin Index (%) 130 119 TONGUE RIVER Big Goose 7990 9.4 9.2 102 10.8 12.9 84 Bone Springs Div 9350 22.2 16.2 137 17.2 17.0 101 Burgess Junction 7880 11.5 12.7 91 10.6 13.7 77 Dome Lake 8880 16.2 11.8 137 14.4 15.1 95 Little Goose 8870 11.3 -M * 14.5 -M * Sucker Creek 8880 12.4 12.7 98 11.5 16.0 72 Tie Creek 6870 4.6 4.1 112 11.1 13.1 85 ----- ----- Basin Index (%) 114 86 BELLE FOURCHE Cole Canyon 5910 6.2 1.6 388 12.0 10.6 113 ----- ----- Basin Index (%) 388 113 CHEYENNE RIVER BASIN Blind Park 6890 6.6 3.9 169 13.2 13.3 99 North Rapid Creek 6130 5.3 3.9 136 10.5 11.3 93 ----- ----- Basin Index (%) 153 96 UPPER N. PLATTE Arapaho Ridge 10960 23.7 21.4 111 23.6 24.5 96 Blackhall Mtn 9820 30.2 -M * 30.0 -M * Columbine 9160 24.6 20.6 119 28.7 27.2 106 Divide Peak 8880 14.7 18.4 80 20.3 23.0 88 Joe Wright 10120 23.6 22.5 105 33.8 28.1 120 Laprele Creek 8375 5.5 7.7 71 9.5 13.9 68 Med Bow 10500 39.3 -M * 37.7 -M * North French Creek 10130 31.4 32.1 98 31.0 28.9 107 Never Summer 10280 22.7 20.8 109 18.8 -M * Old Battle 10000 28.1 33.2 85 26.5 37.4 71 Rawah 9020 10.4 8.2 127 17.0 15.7 108 Sage Creek Basin 7850 1.7 4.9 35 11.5 15.3 75 Sand Lake 10050 30.5 30.6 100 26.0 27.1 96 South Brush Creek 8440 8.0 9.7 82 13.5 16.7 81 Tower 10500 43.6 48.5 90 -M 42.5 * Webber Springs 9250 18.2 21.8 83 23.8 28.6 83 Willow Creek Pass 9540 15.1 13.4 113 16.2 14.6 111 Zirkel 9340 25.6 22.6 113 34.5 29.9 115 ----- ----- Basin Index (%) 97 95 SWEETWATER Deer Park 9700 12.5 16.3 77 16.6 21.8 76 Larsen Creek 9000 9.2 10.1 91 12.0 -M * South Pass 9040 11.9 15.4 77 -M 18.8 * ----- ----- Basin Index (%) 80 76* LOWER N. PLATTE Casper Mtn. 7900 8.7 14.3 61 8.1 16.8 48 Laprele Creek 8375 5.5 7.7 71 9.5 13.9 68 Reno Hill 8400 11.3 14.0 81 13.6 17.4 78 Windy Peak 7900 5.9 6.4 92 9.8 11.8 83 ----- ----- Basin Index (%) 74 68 LARAMIE RIVER Brooklyn Lake 10240 27.5 22.4 123 28.1 23.1 122 Cinnabar Park 9574 22.4 19.9 113 27.1 25.7 105 Crow Creek 8330 2.2 .4 550* 12.4 12.1 102 Deadman Hill 10220 22.9 17.4 132 21.9 19.2 114 Rawah 9020 10.4 8.2 127 17.0 15.7 108 Roach 9700 14.5 16.6 87 19.1 20.9 91 ----- ----- Basin Index (%) 118 108 S. PLATTE Black Mountain 8920 10.3 -M * 14.8 -M * Crow Creek 8330 2.2 .4 550* 12.4 12.1 102 Deadman Hill 10220 22.9 17.4 132 21.9 19.2 114 ----- ----- Basin Index (%) 141* 110 LITTLE SNAKE RIVER Battle Mountain 7440 1.0 3.5 29 12.4 16.2 77 Divide Peak 8880 14.7 18.4 80 20.3 23.0 88 Elk River 8700 13.4 15.0 89 18.6 21.5 87 Little Snake River 8915 21.9 23.8 92 30.7 31.2 98 Old Battle 10000 28.1 33.2 85 26.5 37.4 71 Sage Creek Basin 7850 1.7 4.9 35 11.5 15.3 75 Sandstone RS 8150 6.0 9.8 61 11.0 19.7 56 Whiskey Park 8950 25.7 25.7 100 28.6 29.9 96 ----- ----- Basin Index (%) 84 82 UPPER GREEN RIVER Big Sandy Opening 9080 12.9 12.4 104 13.9 14.3 97 Blind Bull Sum 8650 37.7 24.2 156 22.0 20.4 108 East Rim Divide 7930 9.7 9.4 103 13.4 12.3 109 Elkhart Park G.S. 9400 13.1 11.9 110 13.1 14.2 92 Gros Ventre Summit 8750 16.5 13.0 127 16.8 13.8 122 Gunsight Pass 9820 18.4 13.7 134 18.4 15.0 123 Kendall R.S. 7740 11.4 7.7 148 16.8 14.8 114 Loomis Park 8240 16.4 12.5 131 20.2 18.1 112 New Fork Lake 8340 9.1 8.3 110 12.5 11.4 110 Pocket Creek 9360 9.2 -M * 10.0 -M * Snider Basin 8060 8.6 10.5 82 16.0 14.9 107 Spring Creek Divide 9000 29.3 23.6 124 27.1 25.0 108 Triple Peak 8500 35.2 19.2 183 34.9 26.6 131 ----- ----- Basin Index (%) 131 112 LOWER GREEN RIVER Blacks Fork Jct 8869 5.2 -M * 10.5 -M * Buck Pasture 9632 12.6 -M * 15.4 -M * EF Blacks Fork GS 9360 9.8 -M * 7.6 -M * Hams Fork 7840 5.8 6.0 97 11.2 12.2 92 Hewinta 9500 6.7 7.6 88 12.9 15.2 85 Hickerson Park 9122 3.2 5.2 62 9.1 11.2 81 Hole-in-Rock 9168 5.5 5.6 98 9.7 10.7 91 Indian Creek 9425 24.1 23.5 103 18.0 23.8 76 Kelley R.S. 8180 12.7 12.2 104 16.2 19.1 85 Spirit Lk 10235 11.4 -M * 13.6 -M * Steel Creek Park 10158 16.1 16.3 99 16.2 18.0 90 ----- ----- Basin Index (%) 97 85 UPPER BEAR RIVER Bear River RS 8777 .6 -M * 11.6 -M * Bug Lake 7987 13.3 16.6 80 17.8 20.6 86 Burts Miller Ranch 8000 .4 -M * 6.6 -M * Chalk Creek #1 9171 14.9 24.5 61 18.0 27.1 66 Hayden Fork 9130 7.1 11.2 63 18.0 22.6 80 Kelley R.S. 8180 12.7 12.2 104 16.2 19.1 85 Lily Lake 9133 9.1 10.2 89 12.5 18.5 68 Monte Cristo 8932 23.8 27.3 87 24.3 27.7 88 Salt River Summit 7640 8.2 9.2 89 14.4 17.5 82 ----- ----- Basin Index (%) 80 79 ----------------------------------------------------------------------------- -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.