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 30 , 2018 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 12.6 9.7 130 24.9 22.6 110 Black Bear 8170 46.1 37.4 123 45.4 41.6 109 Blind Bull Sum 8650 40.3 23.4 172 22.1 21.2 104 Cottonwood Creek 7670 17.3 15.7 110 30.1 27.3 110 East Rim Divide 7930 2.9 8.3 35 13.5 12.9 105 Grand Targhee 9260 52.9 44.4 119 37.9 34.4 110 Granite Creek 6770 10.7 8.5 126 24.1 21.3 113 Grassy Lake 7265 27.6 29.4 94 40.0 39.1 102 Gros Ventre Summit 8750 14.5 11.7 124 17.1 14.5 118 Gunsight Pass 9820 16.8 12.8 131 18.8 16.0 118 Lewis Lake Divide 7850 42.7 30.3 141 44.3 38.4 115 Phillips Bench 8200 28.8 25.6 112 32.3 30.5 106 Salt River Summit 7640 2.1 8.0 26 14.3 18.3 78 Snake River Station 6920 9.5 7.9 120 26.4 24.6 107 Spring Creek Divide 9000 27.1 24.3 112 27.3 26.1 105 Thumb Divide 7980 15.1 12.9 117 21.6 20.8 104 Togwotee Pass 9580 34.4 24.7 139 37.4 27.1 138 Two Ocean Plateau 9240 43.2 29.7 145 34.2 29.9 114 Willow Creek 8080 31.1 23.5 132 40.9 37.4 109 Younts Peak 8350 -M 15.4 * -M 17.5 * ----- ----- Basin Index (%) 123 110 MADISON-GALLATIN Black Bear 8170 46.1 37.4 123 45.4 41.6 109 Canyon 7870 16.3 10.8 151 21.6 17.9 121 Madison Plateau 7750 28.3 21.6 131 30.5 28.8 106 West Yellowstone 6700 4.1 2.5 164 19.4 15.9 122 Whiskey Creek 6800 14.9 14.9 100 22.5 22.2 101 ----- ----- Basin Index (%) 126 110 YELLOWSTONE Beartooth Lake 9360 40.0 22.9 175 39.0 21.8 179 Burnt Mtn 5880 2.7 .0 * 17.5 15.5 113 Canyon 7870 16.3 10.8 151 21.6 17.9 121 Cole Creek 7850 15.7 16.4 96 14.4 16.2 89 Evening Star 9200 44.0 24.9 177 -M 30.2 * Fisher Creek 9100 57.8 32.8 176 51.9 34.9 149 Northeast Entrance 7350 9.0 3.5 257 20.3 13.7 148 Parker Peak 9400 38.4 21.4 179 33.4 19.9 168 Sylvan Lake 8420 24.7 20.1 123 31.5 24.9 127 Thumb Divide 7980 15.1 12.9 117 21.6 20.8 104 Two Ocean Plateau 9240 43.2 29.7 145 34.2 29.9 114 White Mill 8700 43.9 23.8 184 35.7 26.1 137 Wolverine 7650 18.2 3.1 587 23.5 13.7 172 ----- ----- Basin Index (%) 166 135 WIND RIVER Burroughs Creek 8750 12.0 -M * 20.0 -M * Castle Creek 8400 .6 -M * 11.0 -M * Cold Springs 9630 3.8 1.4 271 11.1 12.4 90 Deer Park 9700 9.9 16.1 61 16.8 23.2 72 Hobbs Park 10100 16.4 16.0 102 16.7 16.5 101 Kirwin 9550 19.3 10.4 186 20.3 13.6 149 Little Warm 9370 14.8 8.8 168 19.3 15.3 126 Owl Creek 8975 .0 1.2 0 7.5 7.8 96 South Pass 9040 8.6 15.0 57 -M 20.2 * St. Lawrence Alt 8620 .0 3.0 0 9.0 11.4 79 Togwotee Pass 9580 34.4 24.7 139 37.4 27.1 138 Townsend Creek 8700 1.7 7.8 22 10.8 14.8 73 ----- ----- Basin Index (%) 104 105 BIGHORN BASIN Bald Mtn. 9380 21.7 20.5 106 19.0 19.5 97 Bear Trap Meadow 8200 5.6 1.1 509 11.9 10.4 114 Bone Springs Div 9350 21.9 16.6 132 17.7 18.0 98 Grave Springs 8550 6.3 9.4 67 -M 12.6 * Kirwin 9550 19.3 10.4 186 20.3 13.6 149 Marquette 8760 5.6 -M * 11.8 -M * Middle Powder 7760 8.9 11.8 75 -M 14.0 * Owl Creek 8975 .0 1.2 0 7.5 7.8 96 Powder River Pass 9480 14.9 9.6 155 17.6 14.9 118 Shell Creek 9580 22.2 16.0 139 18.3 16.1 114 Timber Creek 7950 .0 3.2 0 -M 9.8 * ----- ----- Basin Index (%) 121 112 SHOSHONE RIVER Blackwater 9780 37.1 25.2 147 35.7 23.3 153 Evening Star 9200 44.0 24.9 177 -M 30.2 * Marquette 8760 5.6 -M * 11.8 -M * Sylvan Road 7120 6.6 6.3 105 24.9 18.5 135 Younts Peak 8350 -M 15.4 * -M 17.5 * ----- ----- Basin Index (%) 155 145* POWDER RIVER Bear Trap Meadow 8200 5.6 1.1 509 11.9 10.4 114 Cloud Peak Reservoir 9860 16.2 16.5 98 17.1 16.4 104 Grave Springs 8550 6.3 9.4 67 -M 12.6 * Hansen Sawmill 8360 5.6 2.9 193 12.1 10.7 113 Middle Powder 7760 8.9 11.8 75 -M 14.0 * Powder River Pass 9480 14.9 9.6 155 17.6 14.9 118 Soldier Park 8720 3.7 -M * 11.8 -M * ----- ----- Basin Index (%) 112 112 TONGUE RIVER Big Goose 7990 7.7 9.2 84 11.1 13.8 80 Bone Springs Div 9350 21.9 16.6 132 17.7 18.0 98 Burgess Junction 7880 10.9 12.1 90 10.8 14.6 74 Dome Lake 8880 13.1 11.5 114 14.9 16.2 92 Little Goose 8870 8.7 -M * 14.9 -M * Sucker Creek 8880 10.2 12.3 83 11.9 17.1 70 Tie Creek 6870 .5 2.7 19 11.3 14.1 80 ----- ----- Basin Index (%) 100 83 BELLE FOURCHE Cole Canyon 5910 1.6 .3 533* 12.8 11.5 111 ----- ----- Basin Index (%) 533* 111 CHEYENNE RIVER BASIN Blind Park 6890 1.4 1.3 108 13.5 14.1 96 North Rapid Creek 6130 .1 1.3 8 10.9 12.0 91 ----- ----- Basin Index (%) 58 93 UPPER N. PLATTE Arapaho Ridge 10960 21.5 22.3 96 23.9 26.0 92 Blackhall Mtn 9820 26.0 -M * 30.0 -M * Columbine 9160 17.8 18.6 96 28.9 28.4 102 Divide Peak 8880 7.8 18.0 43 20.2 24.1 84 Joe Wright 10120 21.6 23.4 92 33.9 29.6 115 Laprele Creek 8375 .2 6.4 3 9.9 14.9 66 Med Bow 10500 44.0 -M * 37.9 -M * North French Creek 10130 29.1 32.9 88 31.2 30.5 102 Never Summer 10280 21.3 21.7 98 18.8 -M * Old Battle 10000 26.6 34.7 77 26.8 39.0 69 Rawah 9020 5.7 6.5 88 17.2 17.1 101 Sage Creek Basin 7850 -M 1.1 * 11.4 16.1 71 Sand Lake 10050 28.9 31.3 92 26.2 28.9 91 South Brush Creek 8440 1.3 9.6 14 13.5 17.7 76 Tower 10500 44.4 49.9 89 41.5 44.5 93 Webber Springs 9250 14.5 21.9 66 23.7 29.8 80 Willow Creek Pass 9540 13.5 14.1 96 16.3 15.6 104 Zirkel 9340 18.1 21.2 85 34.5 30.8 112 ----- ----- Basin Index (%) 82 91 SWEETWATER Deer Park 9700 9.9 16.1 61 16.8 23.2 72 Larsen Creek 9000 3.0 9.3 32 12.1 -M * South Pass 9040 8.6 15.0 57 -M 20.2 * ----- ----- Basin Index (%) 53 72* LOWER N. PLATTE Casper Mtn. 7900 5.1 13.7 37 8.2 17.8 46 Laprele Creek 8375 .2 6.4 3 9.9 14.9 66 Reno Hill 8400 8.6 12.8 67 13.7 18.7 73 Windy Peak 7900 1.4 4.4 32 10.1 12.9 78 ----- ----- Basin Index (%) 41 65 LARAMIE RIVER Brooklyn Lake 10240 23.5 23.3 101 28.4 24.5 116 Cinnabar Park 9574 18.7 19.7 95 27.2 26.8 101 Crow Creek 8330 .0 .0 * 12.5 13.3 94 Deadman Hill 10220 20.9 18.9 111 22.1 20.5 108 Rawah 9020 5.7 6.5 88 17.2 17.1 101 Roach 9700 11.7 17.2 68 19.2 22.2 86 ----- ----- Basin Index (%) 94 102 S. PLATTE Black Mountain 8920 6.5 -M * 14.9 -M * Crow Creek 8330 .0 .0 * 12.5 13.3 94 Deadman Hill 10220 20.9 18.9 111 22.1 20.5 108 ----- ----- Basin Index (%) 111* 102 LITTLE SNAKE RIVER Battle Mountain 7440 .0 .0 * 12.8 17.0 75 Divide Peak 8880 7.8 18.0 43 20.2 24.1 84 Elk River 8700 5.7 13.6 42 18.6 22.5 83 Little Snake River 8915 15.4 22.5 68 30.6 32.5 94 Old Battle 10000 26.6 34.7 77 26.8 39.0 69 Sage Creek Basin 7850 -M 1.1 * 11.4 16.1 71 Sandstone RS 8150 .0 6.3 0 11.2 20.6 54 Whiskey Park 8950 20.1 26.3 76 28.6 31.3 91 ----- ----- Basin Index (%) 62 79 UPPER GREEN RIVER Big Sandy Opening 9080 9.7 10.9 89 14.2 15.1 94 Blind Bull Sum 8650 40.3 23.4 172 22.1 21.2 104 East Rim Divide 7930 2.9 8.3 35 13.5 12.9 105 Elkhart Park G.S. 9400 10.1 11.5 88 13.1 14.9 88 Gros Ventre Summit 8750 14.5 11.7 124 17.1 14.5 118 Gunsight Pass 9820 16.8 12.8 131 18.8 16.0 118 Kendall R.S. 7740 6.2 4.8 129 16.8 15.4 109 Loomis Park 8240 12.3 11.2 110 20.3 18.8 108 New Fork Lake 8340 4.0 6.6 61 12.8 12.0 107 Pocket Creek 9360 8.3 -M * 10.1 -M * Snider Basin 8060 1.9 9.5 20 16.0 15.5 103 Spring Creek Divide 9000 27.1 24.3 112 27.3 26.1 105 Triple Peak 8500 28.6 17.9 160 35.2 27.8 127 ----- ----- Basin Index (%) 114 108 LOWER GREEN RIVER Blacks Fork Jct 8869 .2 -M * 10.4 -M * Buck Pasture 9632 6.8 -M * 15.5 -M * EF Blacks Fork GS 9360 2.4 -M * 7.6 -M * Hams Fork 7840 .0 3.3 0 11.6 13.0 89 Hewinta 9500 .0 5.0 0 12.9 16.0 81 Hickerson Park 9122 .4 4.5 9 9.1 11.9 76 Hole-in-Rock 9168 .1 2.9 3 9.8 11.4 86 Indian Creek 9425 19.7 23.3 85 18.1 24.9 73 Kelley R.S. 8180 7.5 11.7 64 16.2 20.1 81 Spirit Lk 10235 6.1 -M * 13.5 -M * Steel Creek Park 10158 13.4 17.0 79 16.3 18.9 86 ----- ----- Basin Index (%) 61 81 UPPER BEAR RIVER Bear River RS 8777 .0 -M * 11.6 -M * Bug Lake 7987 8.2 15.4 53 18.0 21.6 83 Burts Miller Ranch 8000 .2 -M * 6.7 -M * Chalk Creek #1 9171 8.5 24.4 35 18.0 28.2 64 Hayden Fork 9130 .2 9.5 2 18.0 23.6 76 Kelley R.S. 8180 7.5 11.7 64 16.2 20.1 81 Lily Lake 9133 2.5 9.9 25 12.5 19.4 64 Monte Cristo 8932 17.5 26.9 65 24.6 29.1 85 Salt River Summit 7640 2.1 8.0 26 14.3 18.3 78 ----- ----- Basin Index (%) 44 76 ----------------------------------------------------------------------------- -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.