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 MONDAY: APRIL 16 , 2018 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 19.4 12.8 152 24.5 21.4 114 Black Bear 8170 44.3 36.7 121 44.4 39.1 114 Blind Bull Sum 8650 37.1 23.8 156 21.9 19.9 110 Cottonwood Creek 7670 24.7 19.6 126 29.2 25.3 115 East Rim Divide 7930 12.5 9.8 128 13.3 12.0 111 Grand Targhee 9260 53.6 41.2 130 32.1 32.2 100 Granite Creek 6770 18.1 12.0 151 23.8 20.0 119 Grassy Lake 7265 34.4 31.5 109 39.0 36.8 106 Gros Ventre Summit 8750 17.5 13.0 135 16.7 13.4 125 Gunsight Pass 9820 19.3 13.4 144 18.2 14.5 126 Lewis Lake Divide 7850 45.4 30.2 150 43.6 36.2 120 Phillips Bench 8200 33.1 26.0 127 31.9 28.7 111 Salt River Summit 7640 10.5 10.9 96 14.2 17.1 83 Snake River Station 6920 19.0 12.4 153 26.1 23.1 113 Spring Creek Divide 9000 28.7 23.4 123 26.8 24.4 110 Thumb Divide 7980 21.7 14.4 151 21.2 19.2 110 Togwotee Pass 9580 36.0 23.2 155 33.0 25.1 131 Two Ocean Plateau 9240 42.1 27.4 154 31.0 28.0 111 Willow Creek 8080 38.1 26.7 143 40.0 34.6 116 Younts Peak 8350 -M 14.8 * -M 16.3 * ----- ----- Basin Index (%) 136 113 MADISON-GALLATIN Black Bear 8170 44.3 36.7 121 44.4 39.1 114 Canyon 7870 18.6 12.4 150 21.1 16.7 126 Madison Plateau 7750 29.4 22.6 130 29.5 27.0 109 West Yellowstone 6700 12.3 8.2 150 18.3 14.6 125 Whiskey Creek 6800 16.9 14.8 114 21.5 20.8 103 ----- ----- Basin Index (%) 128 114 YELLOWSTONE Beartooth Lake 9360 42.1 22.6 186 38.6 20.4 189 Burnt Mtn 5880 7.8 .0 * 16.0 13.6 118 Canyon 7870 18.6 12.4 150 21.1 16.7 126 Cole Creek 7850 16.5 15.7 105 -M 14.1 * Evening Star 9200 45.6 24.9 183 42.4 28.2 150 Fisher Creek 9100 56.9 32.0 178 50.9 32.7 156 Northeast Entrance 7350 15.9 7.8 204 19.9 12.7 157 Parker Peak 9400 37.5 20.6 182 30.4 18.3 166 Sylvan Lake 8420 28.5 20.1 142 30.4 23.0 132 Thumb Divide 7980 21.7 14.4 151 21.2 19.2 110 Two Ocean Plateau 9240 42.1 27.4 154 31.0 28.0 111 White Mill 8700 45.6 23.6 193 35.1 24.5 143 Wolverine 7650 24.2 8.3 292 23.0 12.6 183 ----- ----- Basin Index (%) 175 144 WIND RIVER Burroughs Creek 8750 18.2 -M * 19.7 -M * Castle Creek 8400 8.7 -M * 10.6 -M * Cold Springs 9630 10.3 5.6 184 10.8 10.5 103 Deer Park 9700 13.0 16.0 81 16.3 20.9 78 Hobbs Park 10100 18.6 14.9 125 15.9 14.3 111 Kirwin 9550 21.3 10.0 213 19.5 12.1 161 Little Warm 9370 18.0 10.2 176 18.8 13.5 139 Owl Creek 8975 4.6 4.9 94 6.8 6.5 105 South Pass 9040 12.1 15.8 77 -M 18.1 * St. Lawrence Alt 8620 -M 6.2 * 8.7 9.5 92 Togwotee Pass 9580 36.0 23.2 155 33.0 25.1 131 Townsend Creek 8700 7.1 9.9 72 9.7 12.8 76 ----- ----- Basin Index (%) 128 111 BIGHORN BASIN Bald Mtn. 9380 23.9 19.5 123 17.8 17.8 100 Bear Trap Meadow 8200 -M 4.2 * 11.8 9.1 130 Bone Springs Div 9350 22.0 16.6 133 17.0 16.3 104 Grave Springs 8550 8.3 9.6 86 -M 11.2 * Kirwin 9550 21.3 10.0 213 19.5 12.1 161 Marquette 8760 7.1 -M * 10.8 -M * Middle Powder 7760 10.3 12.5 82 -M 12.4 * Owl Creek 8975 4.6 4.9 94 6.8 6.5 105 Powder River Pass 9480 17.1 10.1 169 16.9 13.3 127 Shell Creek 9580 23.4 15.4 152 17.7 14.5 122 Timber Creek 7950 2.1 5.1 41 -M 8.0 * ----- ----- Basin Index (%) 128 120 SHOSHONE RIVER Blackwater 9780 37.5 23.7 158 35.0 21.4 164 Evening Star 9200 45.6 24.9 183 42.4 28.2 150 Marquette 8760 7.1 -M * 10.8 -M * Sylvan Road 7120 16.0 10.3 155 24.5 17.2 142 Younts Peak 8350 -M 14.8 * -M 16.3 * ----- ----- Basin Index (%) 168 153 POWDER RIVER Bear Trap Meadow 8200 -M 4.2 * 11.8 9.1 130 Cloud Peak Reservoir 9860 17.8 15.4 116 16.1 14.3 113 Grave Springs 8550 8.3 9.6 86 -M 11.2 * Hansen Sawmill 8360 9.8 5.6 175 11.7 9.2 127 Middle Powder 7760 10.3 12.5 82 -M 12.4 * Powder River Pass 9480 17.1 10.1 169 16.9 13.3 127 Soldier Park 8720 8.9 -M * 11.4 -M * ----- ----- Basin Index (%) 119 123 TONGUE RIVER Big Goose 7990 9.5 9.6 99 10.3 12.2 84 Bone Springs Div 9350 22.0 16.6 133 17.0 16.3 104 Burgess Junction 7880 11.7 12.2 96 10.4 13.1 79 Dome Lake 8880 16.9 12.0 141 14.1 14.4 98 Little Goose 8870 11.5 -M * 14.0 -M * Sucker Creek 8880 12.9 12.6 102 10.9 15.3 71 Tie Creek 6870 5.9 4.7 126 10.8 12.3 88 ----- ----- Basin Index (%) 117 88 BELLE FOURCHE Cole Canyon 5910 8.0 2.9 276 12.0 10.0 120 ----- ----- Basin Index (%) 276 120 CHEYENNE RIVER BASIN Blind Park 6890 8.6 4.8 179 13.1 12.5 105 North Rapid Creek 6130 7.4 5.1 145 10.4 10.4 100 ----- ----- Basin Index (%) 162 103 UPPER N. PLATTE Arapaho Ridge 10960 22.9 21.6 106 22.6 23.8 95 Blackhall Mtn 9820 30.3 -M * 29.2 -M * Columbine 9160 25.2 21.5 117 27.8 26.5 105 Divide Peak 8880 15.1 19.8 76 19.4 22.3 87 Joe Wright 10120 23.2 22.1 105 33.0 27.1 122 Laprele Creek 8375 7.0 8.9 79 9.4 13.3 71 Med Bow 10500 39.1 -M * 37.2 -M * North French Creek 10130 31.7 31.9 99 30.5 27.9 109 Never Summer 10280 21.9 20.6 106 18.1 -M * Old Battle 10000 27.5 32.2 85 25.9 36.3 71 Rawah 9020 11.4 9.4 121 16.6 15.2 109 Sage Creek Basin 7850 4.7 8.2 57 11.1 15.0 74 Sand Lake 10050 30.1 30.4 99 25.6 26.1 98 South Brush Creek 8440 9.8 10.6 92 13.3 16.0 83 Tower 10500 42.6 47.5 90 -M 41.2 * Webber Springs 9250 19.1 23.1 83 23.0 27.8 83 Willow Creek Pass 9540 14.3 12.7 113 15.6 14.0 111 Zirkel 9340 27.1 23.5 115 33.8 29.3 115 ----- ----- Basin Index (%) 97 96 SWEETWATER Deer Park 9700 13.0 16.0 81 16.3 20.9 78 Larsen Creek 9000 11.0 10.7 103 11.9 -M * South Pass 9040 12.1 15.8 77 -M 18.1 * ----- ----- Basin Index (%) 85 78* LOWER N. PLATTE Casper Mtn. 7900 8.6 14.4 60 7.7 16.1 48 Laprele Creek 8375 7.0 8.9 79 9.4 13.3 71 Reno Hill 8400 11.0 14.1 78 13.0 16.6 78 Windy Peak 7900 6.8 7.3 93 9.6 11.2 86 ----- ----- Basin Index (%) 75 69 LARAMIE RIVER Brooklyn Lake 10240 27.3 22.2 123 27.5 22.2 124 Cinnabar Park 9574 22.6 20.9 108 26.4 24.9 106 Crow Creek 8330 3.6 3.2 112 12.1 11.5 105 Deadman Hill 10220 22.3 16.5 135 21.3 18.3 116 Rawah 9020 11.4 9.4 121 16.6 15.2 109 Roach 9700 14.3 16.5 87 18.3 20.1 91 ----- ----- Basin Index (%) 114 109 S. PLATTE Black Mountain 8920 10.7 -M * 14.4 -M * Crow Creek 8330 3.6 3.2 112 12.1 11.5 105 Deadman Hill 10220 22.3 16.5 135 21.3 18.3 116 ----- ----- Basin Index (%) 131 112 LITTLE SNAKE RIVER Battle Mountain 7440 3.4 6.3 54 11.9 15.7 76 Divide Peak 8880 15.1 19.8 76 19.4 22.3 87 Elk River 8700 14.7 16.9 87 18.2 20.8 88 Little Snake River 8915 22.6 25.6 88 30.2 30.8 98 Old Battle 10000 27.5 32.2 85 25.9 36.3 71 Sage Creek Basin 7850 4.7 8.2 57 11.1 15.0 74 Sandstone RS 8150 8.1 11.4 71 10.6 19.1 55 Whiskey Park 8950 26.4 26.7 99 27.8 29.0 96 ----- ----- Basin Index (%) 83 82 UPPER GREEN RIVER Big Sandy Opening 9080 14.0 12.8 109 13.8 13.8 100 Blind Bull Sum 8650 37.1 23.8 156 21.9 19.9 110 East Rim Divide 7930 12.5 9.8 128 13.3 12.0 111 Elkhart Park G.S. 9400 13.5 12.0 112 12.8 13.8 93 Gros Ventre Summit 8750 17.5 13.0 135 16.7 13.4 125 Gunsight Pass 9820 19.3 13.4 144 18.2 14.5 126 Kendall R.S. 7740 14.2 9.6 148 16.8 14.5 116 Loomis Park 8240 19.1 13.5 141 20.0 17.7 113 New Fork Lake 8340 11.6 9.4 123 12.4 11.1 112 Pocket Creek 9360 9.9 -M * 9.8 -M * Snider Basin 8060 11.3 11.4 99 15.7 14.5 108 Spring Creek Divide 9000 28.7 23.4 123 26.8 24.4 110 Triple Peak 8500 35.4 19.5 182 34.7 25.9 134 ----- ----- Basin Index (%) 136 114 LOWER GREEN RIVER Blacks Fork Jct 8869 6.3 -M * 9.9 -M * Buck Pasture 9632 12.2 -M * 14.8 -M * EF Blacks Fork GS 9360 10.2 -M * 7.0 -M * Hams Fork 7840 8.6 8.2 105 10.4 11.7 89 Hewinta 9500 7.0 9.4 74 12.1 14.6 83 Hickerson Park 9122 4.2 6.3 67 8.4 10.7 79 Hole-in-Rock 9168 5.9 6.6 89 8.9 10.3 86 Indian Creek 9425 24.9 23.7 105 17.7 23.2 76 Kelley R.S. 8180 14.4 13.5 107 16.0 18.6 86 Spirit Lk 10235 10.6 -M * 12.6 -M * Steel Creek Park 10158 15.2 16.1 94 15.4 17.3 89 ----- ----- Basin Index (%) 96 84 UPPER BEAR RIVER Bear River RS 8777 3.2 -M * 11.3 -M * Bug Lake 7987 14.6 18.8 78 17.8 20.0 89 Burts Miller Ranch 8000 .1 -M * 6.7 -M * Chalk Creek #1 9171 15.3 24.9 61 17.5 26.2 67 Hayden Fork 9130 9.9 13.4 74 17.7 21.9 81 Kelley R.S. 8180 14.4 13.5 107 16.0 18.6 86 Lily Lake 9133 9.3 12.1 77 11.7 17.9 65 Monte Cristo 8932 24.0 27.7 87 24.0 26.8 90 Salt River Summit 7640 10.5 10.9 96 14.2 17.1 83 ----- ----- Basin Index (%) 81 80 ----------------------------------------------------------------------------- -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.