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 FRIDAY: APRIL 27 , 2018 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 14.6 10.4 140 24.9 22.3 112 Black Bear 8170 47.7 37.0 129 45.4 41.1 110 Blind Bull Sum 8650 37.6 24.1 156 22.0 20.8 106 Cottonwood Creek 7670 19.8 16.7 119 30.1 26.8 112 East Rim Divide 7930 5.9 8.8 67 13.5 12.5 108 Grand Targhee 9260 54.7 43.6 125 37.8 33.6 112 Granite Creek 6770 13.2 9.0 147 24.1 20.8 116 Grassy Lake 7265 31.0 30.0 103 40.0 38.5 104 Gros Ventre Summit 8750 15.5 12.1 128 17.1 14.2 120 Gunsight Pass 9820 18.0 13.3 135 18.9 15.5 122 Lewis Lake Divide 7850 44.1 30.7 144 -M 37.8 * Phillips Bench 8200 31.3 25.6 122 32.3 30.0 108 Salt River Summit 7640 5.1 8.2 62 14.4 18.0 80 Snake River Station 6920 13.2 9.4 140 26.3 24.2 109 Spring Creek Divide 9000 28.8 24.0 120 27.3 25.6 107 Thumb Divide 7980 17.6 13.9 127 21.5 20.4 105 Togwotee Pass 9580 35.7 24.6 145 37.4 26.6 141 Two Ocean Plateau 9240 43.6 29.3 149 34.0 29.5 115 Willow Creek 8080 35.2 24.9 141 40.9 36.7 111 Younts Peak 8350 -M 15.1 * -M 17.2 * ----- ----- Basin Index (%) 130 111 MADISON-GALLATIN Black Bear 8170 47.7 37.0 129 45.4 41.1 110 Canyon 7870 17.6 11.5 153 21.6 17.6 123 Madison Plateau 7750 29.8 22.2 134 30.5 28.3 108 West Yellowstone 6700 7.1 4.2 169 19.4 15.6 124 Whiskey Creek 6800 15.9 15.4 103 22.4 21.9 102 ----- ----- Basin Index (%) 131 112 YELLOWSTONE Beartooth Lake 9360 42.1 23.4 180 39.0 21.4 182 Burnt Mtn 5880 5.1 .0 * 17.4 15.0 116 Canyon 7870 17.6 11.5 153 21.6 17.6 123 Cole Creek 7850 16.8 16.3 103 14.4 15.7 92 Evening Star 9200 44.9 24.6 183 -M 29.7 * Fisher Creek 9100 57.1 33.2 172 51.9 34.4 151 Northeast Entrance 7350 11.7 4.6 254 20.2 13.4 151 Parker Peak 9400 39.5 21.8 181 33.4 19.6 170 Sylvan Lake 8420 26.5 20.3 131 31.4 24.5 128 Thumb Divide 7980 17.6 13.9 127 21.5 20.4 105 Two Ocean Plateau 9240 43.6 29.3 149 34.0 29.5 115 White Mill 8700 45.3 23.7 191 35.7 25.7 139 Wolverine 7650 20.5 4.8 427 23.5 13.4 175 ----- ----- Basin Index (%) 171 137 WIND RIVER Burroughs Creek 8750 14.2 -M * 19.9 -M * Castle Creek 8400 3.5 -M * 10.9 -M * Cold Springs 9630 6.0 2.4 250 11.0 11.9 92 Deer Park 9700 11.4 16.3 70 16.7 22.9 73 Hobbs Park 10100 18.1 15.8 115 16.7 16.2 103 Kirwin 9550 19.5 10.2 191 20.2 13.3 152 Little Warm 9370 16.1 9.2 175 19.3 14.7 131 Owl Creek 8975 .4 2.0 20 7.5 7.5 100 South Pass 9040 10.5 15.2 69 -M 19.8 * St. Lawrence Alt 8620 .0 4.2 0 9.0 11.0 82 Togwotee Pass 9580 35.7 24.6 145 37.4 26.6 141 Townsend Creek 8700 4.4 8.4 52 10.4 14.5 72 ----- ----- Basin Index (%) 113 107 BIGHORN BASIN Bald Mtn. 9380 24.3 20.6 118 18.9 19.1 99 Bear Trap Meadow 8200 7.9 1.6 494 12.0 10.1 119 Bone Springs Div 9350 22.6 16.5 137 17.6 17.6 100 Grave Springs 8550 7.8 9.1 86 -M 12.3 * Kirwin 9550 19.5 10.2 191 20.2 13.3 152 Marquette 8760 6.8 -M * 11.7 -M * Middle Powder 7760 10.7 12.2 88 -M 13.7 * Owl Creek 8975 .4 2.0 20 7.5 7.5 100 Powder River Pass 9480 16.2 10.0 162 17.5 14.5 121 Shell Creek 9580 23.5 15.9 148 18.3 15.7 117 Timber Creek 7950 .0 3.6 0 -M 9.3 * ----- ----- Basin Index (%) 131 115 SHOSHONE RIVER Blackwater 9780 37.7 24.7 153 35.6 22.8 156 Evening Star 9200 44.9 24.6 183 -M 29.7 * Marquette 8760 6.8 -M * 11.7 -M * Sylvan Road 7120 10.2 7.5 136 24.9 18.1 138 Younts Peak 8350 -M 15.1 * -M 17.2 * ----- ----- Basin Index (%) 163 148* POWDER RIVER Bear Trap Meadow 8200 7.9 1.6 494 12.0 10.1 119 Cloud Peak Reservoir 9860 17.5 16.5 106 16.8 16.0 105 Grave Springs 8550 7.8 9.1 86 -M 12.3 * Hansen Sawmill 8360 7.8 3.8 205 12.1 10.3 117 Middle Powder 7760 10.7 12.2 88 -M 13.7 * Powder River Pass 9480 16.2 10.0 162 17.5 14.5 121 Soldier Park 8720 6.2 -M * 11.7 -M * ----- ----- Basin Index (%) 128 115 TONGUE RIVER Big Goose 7990 9.1 9.1 100 11.1 13.5 82 Bone Springs Div 9350 22.6 16.5 137 17.6 17.6 100 Burgess Junction 7880 11.8 12.3 96 10.8 14.3 76 Dome Lake 8880 15.8 11.7 135 14.9 15.9 94 Little Goose 8870 10.7 -M * 14.9 -M * Sucker Creek 8880 12.1 12.5 97 11.9 16.7 71 Tie Creek 6870 3.4 3.0 113 11.4 13.7 83 ----- ----- Basin Index (%) 115 85 BELLE FOURCHE Cole Canyon 5910 4.8 .4 1200* 12.5 11.2 112 ----- ----- Basin Index (%) 1200* 112 CHEYENNE RIVER BASIN Blind Park 6890 4.5 2.7 167 13.5 13.8 98 North Rapid Creek 6130 3.0 2.7 111 10.9 11.8 92 ----- ----- Basin Index (%) 139 95 UPPER N. PLATTE Arapaho Ridge 10960 23.9 22.1 108 23.8 25.7 93 Blackhall Mtn 9820 28.1 -M * 30.0 -M * Columbine 9160 21.5 19.9 108 28.7 27.9 103 Divide Peak 8880 11.1 17.9 62 20.2 23.8 85 Joe Wright 10120 23.0 23.4 98 33.8 29.2 116 Laprele Creek 8375 3.1 7.1 44 9.7 14.6 66 Med Bow 10500 44.9 -M * 37.8 -M * North French Creek 10130 30.6 32.9 93 31.1 30.0 104 Never Summer 10280 22.4 21.4 105 18.8 -M * Old Battle 10000 27.5 34.4 80 26.7 38.4 70 Rawah 9020 8.2 7.8 105 17.1 16.8 102 Sage Creek Basin 7850 -M 1.7 * 11.4 15.8 72 Sand Lake 10050 29.9 31.2 96 26.2 28.4 92 South Brush Creek 8440 4.4 10.0 44 13.5 17.4 78 Tower 10500 45.3 49.7 91 -M 43.8 * Webber Springs 9250 16.4 22.0 75 23.7 29.4 81 Willow Creek Pass 9540 14.6 13.8 106 16.2 15.3 106 Zirkel 9340 21.8 21.9 100 34.4 30.5 113 ----- ----- Basin Index (%) 91 92 SWEETWATER Deer Park 9700 11.4 16.3 70 16.7 22.9 73 Larsen Creek 9000 6.2 9.6 65 12.1 -M * South Pass 9040 10.5 15.2 69 -M 19.8 * ----- ----- Basin Index (%) 68 73* LOWER N. PLATTE Casper Mtn. 7900 7.4 14.1 52 8.2 17.5 47 Laprele Creek 8375 3.1 7.1 44 9.7 14.6 66 Reno Hill 8400 10.4 13.6 76 13.7 18.3 75 Windy Peak 7900 3.9 5.5 71 10.1 12.6 80 ----- ----- Basin Index (%) 62 66 LARAMIE RIVER Brooklyn Lake 10240 26.3 23.0 114 28.4 24.1 118 Cinnabar Park 9574 21.1 20.1 105 27.2 26.4 103 Crow Creek 8330 .0 .0 * 12.4 13.0 95 Deadman Hill 10220 22.6 18.5 122 22.1 20.1 110 Rawah 9020 8.2 7.8 105 17.1 16.8 102 Roach 9700 13.6 17.0 80 19.2 21.7 88 ----- ----- Basin Index (%) 106 104 S. PLATTE Black Mountain 8920 9.2 -M * 15.0 -M * Crow Creek 8330 .0 .0 * 12.4 13.0 95 Deadman Hill 10220 22.6 18.5 122 22.1 20.1 110 ----- ----- Basin Index (%) 122* 104 LITTLE SNAKE RIVER Battle Mountain 7440 .0 1.0 0* 12.4 16.8 74 Divide Peak 8880 11.1 17.9 62 20.2 23.8 85 Elk River 8700 10.0 14.3 70 18.7 22.2 84 Little Snake River 8915 18.1 23.1 78 30.5 32.0 95 Old Battle 10000 27.5 34.4 80 26.7 38.4 70 Sage Creek Basin 7850 -M 1.7 * 11.4 15.8 72 Sandstone RS 8150 1.7 7.7 22 11.0 20.3 54 Whiskey Park 8950 22.8 25.7 89 28.6 30.8 93 ----- ----- Basin Index (%) 73 80 UPPER GREEN RIVER Big Sandy Opening 9080 11.5 11.8 97 14.1 14.8 95 Blind Bull Sum 8650 37.6 24.1 156 22.0 20.8 106 East Rim Divide 7930 5.9 8.8 67 13.5 12.5 108 Elkhart Park G.S. 9400 11.9 11.8 101 13.2 14.6 90 Gros Ventre Summit 8750 15.5 12.1 128 17.1 14.2 120 Gunsight Pass 9820 18.0 13.3 135 18.9 15.5 122 Kendall R.S. 7740 8.2 5.9 139 16.8 15.1 111 Loomis Park 8240 14.2 11.5 123 20.3 18.5 110 New Fork Lake 8340 6.3 7.1 89 12.6 11.7 108 Pocket Creek 9360 9.1 -M * 10.0 -M * Snider Basin 8060 4.3 10.0 43 16.0 15.2 105 Spring Creek Divide 9000 28.8 24.0 120 27.3 25.6 107 Triple Peak 8500 32.1 18.8 171 35.2 27.3 129 ----- ----- Basin Index (%) 122 110 LOWER GREEN RIVER Blacks Fork Jct 8869 .7 -M * 10.5 -M * Buck Pasture 9632 9.2 -M * 15.5 -M * EF Blacks Fork GS 9360 5.6 -M * -M -M * Hams Fork 7840 1.8 4.4 41 11.6 12.7 91 Hewinta 9500 2.3 6.1 38 12.8 15.7 82 Hickerson Park 9122 .3 5.0 6 9.0 11.7 77 Hole-in-Rock 9168 .9 4.2 21 9.7 11.2 87 Indian Creek 9425 22.0 23.8 92 18.3 24.4 75 Kelley R.S. 8180 10.0 11.8 85 16.2 19.7 82 Spirit Lk 10235 8.6 -M * 13.6 -M * Steel Creek Park 10158 14.5 16.7 87 16.3 18.6 88 ----- ----- Basin Index (%) 72 82 UPPER BEAR RIVER Bear River RS 8777 .0 -M * 11.6 -M * Bug Lake 7987 10.8 16.1 67 18.0 21.1 85 Burts Miller Ranch 8000 .6 -M * 6.7 -M * Chalk Creek #1 9171 11.0 24.7 45 18.0 27.8 65 Hayden Fork 9130 1.5 10.1 15 18.0 23.2 78 Kelley R.S. 8180 10.0 11.8 85 16.2 19.7 82 Lily Lake 9133 5.4 9.7 56 12.5 19.0 66 Monte Cristo 8932 20.9 27.3 77 24.6 28.5 86 Salt River Summit 7640 5.1 8.2 62 14.4 18.0 80 ----- ----- Basin Index (%) 60 77 ----------------------------------------------------------------------------- -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.