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 15 , 2018 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 19.7 13.2 149 24.4 21.3 115 Black Bear 8170 44.0 36.6 120 44.3 39.0 114 Blind Bull Sum 8650 37.0 23.8 155 21.8 19.8 110 Cottonwood Creek 7670 24.8 19.8 125 29.1 25.2 115 East Rim Divide 7930 12.6 10.0 126 13.3 11.9 112 Grand Targhee 9260 53.6 41.0 131 32.1 32.0 100 Granite Creek 6770 18.2 12.3 148 23.8 19.9 120 Grassy Lake 7265 34.6 31.5 110 39.0 36.6 107 Gros Ventre Summit 8750 17.5 13.0 135 16.6 13.3 125 Gunsight Pass 9820 19.3 13.4 144 18.2 14.3 127 Lewis Lake Divide 7850 45.1 30.2 149 43.4 36.1 120 Phillips Bench 8200 33.1 26.0 127 31.9 28.6 112 Salt River Summit 7640 10.6 11.2 95 14.2 17.0 84 Snake River Station 6920 19.0 12.8 148 26.2 22.9 114 Spring Creek Divide 9000 28.6 23.2 123 26.8 24.3 110 Thumb Divide 7980 21.6 14.4 150 21.2 19.0 112 Togwotee Pass 9580 35.9 23.0 156 33.0 24.9 133 Two Ocean Plateau 9240 42.0 27.2 154 31.0 27.9 111 Willow Creek 8080 38.1 26.7 143 39.9 34.4 116 Younts Peak 8350 -M 14.7 * -M 16.2 * ----- ----- Basin Index (%) 136 113 MADISON-GALLATIN Black Bear 8170 44.0 36.6 120 44.3 39.0 114 Canyon 7870 18.6 12.4 150 21.1 16.6 127 Madison Plateau 7750 29.5 22.5 131 29.5 26.8 110 West Yellowstone 6700 12.4 8.2 151 18.3 14.4 127 Whiskey Creek 6800 16.9 14.8 114 21.5 20.6 104 ----- ----- Basin Index (%) 128 115 YELLOWSTONE Beartooth Lake 9360 42.0 22.4 188 38.6 20.3 190 Burnt Mtn 5880 7.9 .2 3950* 16.0 13.5 119 Canyon 7870 18.6 12.4 150 21.1 16.6 127 Cole Creek 7850 16.5 15.6 106 -M 14.0 * Evening Star 9200 45.3 24.7 183 42.4 28.1 151 Fisher Creek 9100 56.9 31.9 178 50.6 32.6 155 Northeast Entrance 7350 16.0 8.0 200 19.9 12.6 158 Parker Peak 9400 37.4 20.5 182 30.4 18.2 167 Sylvan Lake 8420 28.7 20.0 144 30.4 22.9 133 Thumb Divide 7980 21.6 14.4 150 21.2 19.0 112 Two Ocean Plateau 9240 42.0 27.2 154 31.0 27.9 111 White Mill 8700 45.4 23.5 193 35.0 24.4 143 Wolverine 7650 24.2 8.6 281 23.0 12.6 183 ----- ----- Basin Index (%) 175 145 WIND RIVER Burroughs Creek 8750 18.2 -M * 19.7 -M * Castle Creek 8400 8.9 -M * 10.7 -M * Cold Springs 9630 10.5 5.8 181 10.8 10.4 104 Deer Park 9700 13.0 16.0 81 16.2 20.7 78 Hobbs Park 10100 18.5 14.9 124 15.8 14.2 111 Kirwin 9550 21.5 9.9 217 19.5 12.0 162 Little Warm 9370 18.1 10.2 177 18.8 13.4 140 Owl Creek 8975 4.8 5.1 94 6.8 6.4 106 South Pass 9040 12.4 15.8 78 -M 18.0 * St. Lawrence Alt 8620 -M 6.4 * 8.7 9.4 93 Togwotee Pass 9580 35.9 23.0 156 33.0 24.9 133 Townsend Creek 8700 7.3 10.0 73 9.6 12.8 75 ----- ----- Basin Index (%) 128 112 BIGHORN BASIN Bald Mtn. 9380 23.9 19.4 123 17.7 17.7 100 Bear Trap Meadow 8200 -M 4.4 * 11.7 9.1 129 Bone Springs Div 9350 21.9 16.8 130 16.8 16.2 104 Grave Springs 8550 8.4 9.6 88 -M 11.2 * Kirwin 9550 21.5 9.9 217 19.5 12.0 162 Marquette 8760 7.1 -M * 10.8 -M * Middle Powder 7760 10.3 12.4 83 -M 12.3 * Owl Creek 8975 4.8 5.1 94 6.8 6.4 106 Powder River Pass 9480 17.3 10.2 170 16.8 13.2 127 Shell Creek 9580 23.3 15.5 150 17.7 14.3 124 Timber Creek 7950 2.8 5.2 54 -M 7.9 * ----- ----- Basin Index (%) 129 120 SHOSHONE RIVER Blackwater 9780 37.5 23.7 158 35.0 21.3 164 Evening Star 9200 45.3 24.7 183 42.4 28.1 151 Marquette 8760 7.1 -M * 10.8 -M * Sylvan Road 7120 16.0 10.3 155 24.4 17.1 143 Younts Peak 8350 -M 14.7 * -M 16.2 * ----- ----- Basin Index (%) 168 153 POWDER RIVER Bear Trap Meadow 8200 -M 4.4 * 11.7 9.1 129 Cloud Peak Reservoir 9860 17.7 15.4 115 16.0 14.2 113 Grave Springs 8550 8.4 9.6 88 -M 11.2 * Hansen Sawmill 8360 9.9 5.9 168 11.7 9.1 129 Middle Powder 7760 10.3 12.4 83 -M 12.3 * Powder River Pass 9480 17.3 10.2 170 16.8 13.2 127 Soldier Park 8720 8.8 -M * 11.3 -M * ----- ----- Basin Index (%) 119 123 TONGUE RIVER Big Goose 7990 9.5 9.7 98 10.2 12.1 84 Bone Springs Div 9350 21.9 16.8 130 16.8 16.2 104 Burgess Junction 7880 11.6 12.1 96 10.3 13.0 79 Dome Lake 8880 16.9 12.0 141 14.0 14.3 98 Little Goose 8870 11.6 -M * 13.9 -M * Sucker Creek 8880 12.9 12.6 102 10.8 15.1 72 Tie Creek 6870 6.2 4.8 129 10.8 12.3 88 ----- ----- Basin Index (%) 116 88 BELLE FOURCHE Cole Canyon 5910 -M 3.2 * 12.0 10.0 120 ----- ----- Basin Index (%) * 120 CHEYENNE RIVER BASIN Blind Park 6890 8.7 5.1 171 13.1 12.4 106 North Rapid Creek 6130 7.6 5.5 138 10.3 10.4 99 ----- ----- Basin Index (%) 154 103 UPPER N. PLATTE Arapaho Ridge 10960 22.6 21.6 105 22.5 23.7 95 Blackhall Mtn 9820 -M -M * -M -M * Columbine 9160 25.1 21.8 115 27.7 26.4 105 Divide Peak 8880 15.2 20.0 76 19.4 22.2 87 Joe Wright 10120 22.9 22.1 104 32.8 26.9 122 Laprele Creek 8375 7.3 9.0 81 9.3 13.2 70 Med Bow 10500 39.0 -M * -M -M * North French Creek 10130 31.4 31.8 99 30.5 27.8 110 Never Summer 10280 21.8 20.5 106 18.0 -M * Old Battle 10000 27.6 32.2 86 25.8 36.1 71 Rawah 9020 11.3 9.6 118 16.5 15.0 110 Sage Creek Basin 7850 5.2 8.8 59 11.2 15.0 75 Sand Lake 10050 29.8 30.4 98 25.5 25.9 98 South Brush Creek 8440 10.2 10.9 94 13.2 15.9 83 Tower 10500 42.6 47.4 90 -M 41.1 * Webber Springs 9250 19.1 23.3 82 23.0 27.7 83 Willow Creek Pass 9540 14.4 12.7 113 15.6 14.0 111 Zirkel 9340 27.0 23.9 113 33.8 29.2 116 ----- ----- Basin Index (%) 96 96 SWEETWATER Deer Park 9700 13.0 16.0 81 16.2 20.7 78 Larsen Creek 9000 11.2 10.8 104 11.9 -M * South Pass 9040 12.4 15.8 78 -M 18.0 * ----- ----- Basin Index (%) 86 78* LOWER N. PLATTE Casper Mtn. 7900 8.7 14.4 60 7.6 16.0 48 Laprele Creek 8375 7.3 9.0 81 9.3 13.2 70 Reno Hill 8400 11.0 14.1 78 12.9 16.5 78 Windy Peak 7900 7.0 7.4 95 9.4 11.2 84 ----- ----- Basin Index (%) 76 69 LARAMIE RIVER Brooklyn Lake 10240 27.1 22.2 122 27.3 22.1 124 Cinnabar Park 9574 22.5 21.0 107 26.4 24.9 106 Crow Creek 8330 4.0 4.1 98 12.1 11.5 105 Deadman Hill 10220 22.2 16.5 135 21.3 18.2 117 Rawah 9020 11.3 9.6 118 16.5 15.0 110 Roach 9700 14.2 16.5 86 18.3 20.0 92 ----- ----- Basin Index (%) 113 109 S. PLATTE Black Mountain 8920 10.7 -M * 14.4 -M * Crow Creek 8330 4.0 4.1 98 12.1 11.5 105 Deadman Hill 10220 22.2 16.5 135 21.3 18.2 117 ----- ----- Basin Index (%) 127 112 LITTLE SNAKE RIVER Battle Mountain 7440 4.0 6.7 60 11.9 15.6 76 Divide Peak 8880 15.2 20.0 76 19.4 22.2 87 Elk River 8700 14.9 17.2 87 18.1 20.7 87 Little Snake River 8915 22.8 25.8 88 30.2 30.7 98 Old Battle 10000 27.6 32.2 86 25.8 36.1 71 Sage Creek Basin 7850 5.2 8.8 59 11.2 15.0 75 Sandstone RS 8150 8.6 11.8 73 10.6 19.0 56 Whiskey Park 8950 26.2 27.0 97 27.9 28.8 97 ----- ----- Basin Index (%) 83 82 UPPER GREEN RIVER Big Sandy Opening 9080 13.9 12.9 108 13.9 13.7 101 Blind Bull Sum 8650 37.0 23.8 155 21.8 19.8 110 East Rim Divide 7930 12.6 10.0 126 13.3 11.9 112 Elkhart Park G.S. 9400 13.4 12.0 112 12.8 13.7 93 Gros Ventre Summit 8750 17.5 13.0 135 16.6 13.3 125 Gunsight Pass 9820 19.3 13.4 144 18.2 14.3 127 Kendall R.S. 7740 14.4 9.8 147 16.9 14.4 117 Loomis Park 8240 19.1 13.6 140 20.0 17.6 114 New Fork Lake 8340 11.7 9.6 122 12.3 11.0 112 Pocket Creek 9360 9.8 -M * 9.9 -M * Snider Basin 8060 11.6 11.6 100 15.8 14.5 109 Spring Creek Divide 9000 28.6 23.2 123 26.8 24.3 110 Triple Peak 8500 35.2 19.7 179 34.7 25.7 135 ----- ----- Basin Index (%) 136 115 LOWER GREEN RIVER Blacks Fork Jct 8869 6.4 -M * 9.9 -M * Buck Pasture 9632 12.3 -M * 14.8 -M * EF Blacks Fork GS 9360 10.4 -M * 7.2 -M * Hams Fork 7840 8.7 8.6 101 10.4 11.7 89 Hewinta 9500 7.4 9.7 76 12.2 14.5 84 Hickerson Park 9122 4.7 6.6 71 8.3 10.7 78 Hole-in-Rock 9168 6.2 6.8 91 8.9 10.2 87 Indian Creek 9425 24.7 23.9 103 17.7 23.1 77 Kelley R.S. 8180 14.4 13.7 105 16.0 18.5 86 Spirit Lk 10235 10.6 -M * 12.5 -M * Steel Creek Park 10158 15.2 16.1 94 15.4 17.2 90 ----- ----- Basin Index (%) 95 84 UPPER BEAR RIVER Bear River RS 8777 3.8 -M * 11.3 -M * Bug Lake 7987 14.7 19.0 77 17.8 19.9 89 Burts Miller Ranch 8000 .1 -M * 6.5 -M * Chalk Creek #1 9171 15.3 24.9 61 17.7 26.1 68 Hayden Fork 9130 10.3 13.9 74 17.7 21.8 81 Kelley R.S. 8180 14.4 13.7 105 16.0 18.5 86 Lily Lake 9133 9.3 12.4 75 12.2 17.8 69 Monte Cristo 8932 24.2 27.8 87 23.9 26.8 89 Salt River Summit 7640 10.6 11.2 95 14.2 17.0 84 ----- ----- Basin Index (%) 80 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.