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 6 , 2018 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 18.3 15.2 120 21.4 20.5 104 Black Bear 8170 43.3 37.2 116 41.6 37.6 111 Blind Bull Sum 8650 34.1 23.1 148 20.6 19.2 107 Cottonwood Creek 7670 22.4 21.0 107 25.7 24.3 106 East Rim Divide 7930 12.9 10.2 126 12.7 11.6 109 Grand Targhee 9260 46.0 38.2 120 29.1 30.4 96 Granite Creek 6770 18.9 14.6 129 21.8 19.4 112 Grassy Lake 7265 32.9 31.5 104 35.3 35.3 100 Gros Ventre Summit 8750 16.6 12.9 129 15.6 12.7 123 Gunsight Pass 9820 17.7 13.7 129 16.9 13.6 124 Lewis Lake Divide 7850 40.9 29.8 137 38.7 34.8 111 Phillips Bench 8200 29.2 25.2 116 28.5 27.7 103 Salt River Summit 7640 11.3 12.9 88 13.0 16.4 79 Snake River Station 6920 19.0 14.9 128 23.7 22.1 107 Spring Creek Divide 9000 26.8 22.5 119 24.9 23.5 106 Thumb Divide 7980 20.4 14.7 139 19.6 18.3 107 Togwotee Pass 9580 32.6 22.0 148 32.6 23.9 136 Two Ocean Plateau 9240 38.2 25.9 147 29.7 26.6 112 Willow Creek 8080 34.3 28.4 121 35.5 33.0 108 Younts Peak 8350 -M 14.3 * -M 15.5 * ----- ----- Basin Index (%) 125 108 MADISON-GALLATIN Black Bear 8170 43.3 37.2 116 41.6 37.6 111 Canyon 7870 17.1 12.5 137 19.7 16.0 123 Madison Plateau 7750 26.8 21.4 125 27.5 25.9 106 West Yellowstone 6700 13.0 9.7 134 17.4 14.0 124 Whiskey Creek 6800 16.9 14.9 113 18.9 19.8 95 ----- ----- Basin Index (%) 122 110 YELLOWSTONE Beartooth Lake 9360 39.9 21.2 188 -M 19.4 * Burnt Mtn 5880 8.0 4.6 174 14.9 12.8 116 Canyon 7870 17.1 12.5 137 19.7 16.0 123 Cole Creek 7850 15.1 14.4 105 -M 12.7 * Evening Star 9200 42.6 23.7 180 42.1 26.8 157 Fisher Creek 9100 53.1 31.1 171 47.1 31.1 151 Northeast Entrance 7350 14.1 9.1 155 18.5 12.0 154 Parker Peak 9400 34.9 19.3 181 29.5 17.3 171 Sylvan Lake 8420 26.4 19.3 137 28.1 21.8 129 Thumb Divide 7980 20.4 14.7 139 19.6 18.3 107 Two Ocean Plateau 9240 38.2 25.9 147 29.7 26.6 112 White Mill 8700 42.0 22.1 190 32.4 23.2 140 Wolverine 7650 22.7 9.5 239 21.4 12.0 178 ----- ----- Basin Index (%) 165 139 WIND RIVER Burroughs Creek 8750 16.1 -M * 17.9 -M * Castle Creek 8400 8.3 -M * 10.0 -M * Cold Springs 9630 9.9 6.8 146 10.2 9.8 104 Deer Park 9700 12.7 15.4 82 15.6 19.6 80 Hobbs Park 10100 17.9 14.0 128 15.4 13.2 117 Kirwin 9550 20.3 9.6 211 18.2 11.4 160 Little Warm 9370 16.6 10.2 163 17.3 12.6 137 Owl Creek 8975 4.4 5.8 76 6.3 5.9 107 South Pass 9040 12.0 15.1 79 8.7 17.1 51 St. Lawrence Alt 8620 2.7 6.8 40 8.6 8.9 97 Togwotee Pass 9580 32.6 22.0 148 32.6 23.9 136 Townsend Creek 8700 7.3 9.5 77 9.5 11.9 80 ----- ----- Basin Index (%) 118 106 BIGHORN BASIN Bald Mtn. 9380 21.9 19.0 115 16.0 16.7 96 Bear Trap Meadow 8200 -M 5.0 * 11.2 8.4 133 Bone Springs Div 9350 20.3 16.7 122 15.6 15.3 102 Grave Springs 8550 7.9 9.3 85 -M 10.4 * Kirwin 9550 20.3 9.6 211 18.2 11.4 160 Marquette 8760 6.6 -M * 10.2 -M * Middle Powder 7760 10.3 11.9 87 6.6 11.5 57 Owl Creek 8975 4.4 5.8 76 6.3 5.9 107 Powder River Pass 9480 16.8 10.1 166 16.0 12.4 129 Shell Creek 9580 21.9 15.0 146 16.5 13.6 121 Timber Creek 7950 3.6 4.9 73 -M 7.2 * ----- ----- Basin Index (%) 125 112 SHOSHONE RIVER Blackwater 9780 35.2 22.4 157 32.6 20.2 161 Evening Star 9200 42.6 23.7 180 42.1 26.8 157 Marquette 8760 6.6 -M * 10.2 -M * Sylvan Road 7120 15.2 10.8 141 22.4 16.5 136 Younts Peak 8350 -M 14.3 * -M 15.5 * ----- ----- Basin Index (%) 163 153 POWDER RIVER Bear Trap Meadow 8200 -M 5.0 * 11.2 8.4 133 Cloud Peak Reservoir 9860 16.9 14.7 115 15.3 13.1 117 Grave Springs 8550 7.9 9.3 85 -M 10.4 * Hansen Sawmill 8360 9.7 6.2 156 11.2 8.4 133 Middle Powder 7760 10.3 11.9 87 6.6 11.5 57 Powder River Pass 9480 16.8 10.1 166 16.0 12.4 129 Soldier Park 8720 8.5 -M * 10.7 -M * ----- ----- Basin Index (%) 118 112 TONGUE RIVER Big Goose 7990 9.2 9.5 97 9.4 11.2 84 Bone Springs Div 9350 20.3 16.7 122 15.6 15.3 102 Burgess Junction 7880 10.9 11.8 92 9.3 12.2 76 Dome Lake 8880 16.0 11.7 137 12.8 13.4 96 Little Goose 8870 11.0 -M * 12.9 -M * Sucker Creek 8880 12.0 12.0 100 9.6 14.2 68 Tie Creek 6870 5.9 5.5 107 9.9 11.5 86 ----- ----- Basin Index (%) 111 86 BELLE FOURCHE Cole Canyon 5910 -M 5.3 * 10.7 9.3 115 ----- ----- Basin Index (%) * 115 CHEYENNE RIVER BASIN Blind Park 6890 9.0 7.1 127 12.1 11.8 103 North Rapid Creek 6130 8.1 6.6 123 9.5 9.8 97 ----- ----- Basin Index (%) 125 100 UPPER N. PLATTE Arapaho Ridge 10960 19.7 20.7 95 19.4 22.2 87 Blackhall Mtn 9820 28.0 -M * 26.9 -M * Columbine 9160 21.9 23.4 94 23.4 25.2 93 Divide Peak 8880 14.2 19.8 72 17.9 21.2 84 Joe Wright 10120 19.4 21.0 92 28.9 25.5 113 Laprele Creek 8375 6.6 9.4 70 8.1 12.3 66 Med Bow 10500 40.9 -M * 30.8 -M * North French Creek 10130 28.4 29.2 97 27.6 26.4 105 Never Summer 10280 18.8 20.3 93 15.4 -M * Old Battle 10000 25.3 31.1 81 23.8 34.6 69 Rawah 9020 11.2 10.6 106 15.1 14.0 108 Sage Creek Basin 7850 7.9 12.2 65 10.7 14.3 75 Sand Lake 10050 27.3 28.6 95 23.1 24.5 94 South Brush Creek 8440 11.3 12.0 94 12.2 15.0 81 Tower 10500 35.3 45.6 77 26.5 39.4 67 Webber Springs 9250 18.4 23.1 80 21.4 26.4 81 Willow Creek Pass 9540 13.0 12.1 107 13.9 13.3 105 Zirkel 9340 26.9 26.3 102 31.1 28.1 111 ----- ----- Basin Index (%) 88 89 SWEETWATER Deer Park 9700 12.7 15.4 82 15.6 19.6 80 Larsen Creek 9000 11.4 11.7 97 11.6 -M * South Pass 9040 12.0 15.1 79 8.7 17.1 51 ----- ----- Basin Index (%) 86 66 LOWER N. PLATTE Casper Mtn. 7900 7.9 14.3 55 6.9 14.7 47 Laprele Creek 8375 6.6 9.4 70 8.1 12.3 66 Reno Hill 8400 10.1 14.0 72 11.6 15.2 76 Windy Peak 7900 6.4 7.8 82 8.4 10.4 81 ----- ----- Basin Index (%) 68 67 LARAMIE RIVER Brooklyn Lake 10240 25.7 21.5 120 25.4 20.9 122 Cinnabar Park 9574 21.3 21.0 101 24.8 24.0 103 Crow Creek 8330 4.1 7.0 59 10.9 10.7 102 Deadman Hill 10220 20.6 16.0 129 19.6 17.1 115 Rawah 9020 11.2 10.6 106 15.1 14.0 108 Roach 9700 13.6 16.4 83 17.1 19.0 90 ----- ----- Basin Index (%) 104 107 S. PLATTE Black Mountain 8920 10.6 -M * 13.4 -M * Crow Creek 8330 4.1 7.0 59 10.9 10.7 102 Deadman Hill 10220 20.6 16.0 129 19.6 17.1 115 ----- ----- Basin Index (%) 107 110 LITTLE SNAKE RIVER Battle Mountain 7440 5.5 9.8 56 10.6 14.8 72 Divide Peak 8880 14.2 19.8 72 17.9 21.2 84 Elk River 8700 15.1 19.2 79 16.4 19.8 83 Little Snake River 8915 21.3 24.9 86 27.5 29.2 94 Old Battle 10000 25.3 31.1 81 23.8 34.6 69 Sage Creek Basin 7850 7.9 12.2 65 10.7 14.3 75 Sandstone RS 8150 8.7 12.8 68 9.2 18.1 51 Whiskey Park 8950 24.5 27.2 90 25.4 27.6 92 ----- ----- Basin Index (%) 78 79 UPPER GREEN RIVER Big Sandy Opening 9080 13.4 12.5 107 13.2 13.0 102 Blind Bull Sum 8650 34.1 23.1 148 20.6 19.2 107 East Rim Divide 7930 12.9 10.2 126 12.7 11.6 109 Elkhart Park G.S. 9400 12.6 12.2 103 12.1 13.1 92 Gros Ventre Summit 8750 16.6 12.9 129 15.6 12.7 123 Gunsight Pass 9820 17.7 13.7 129 16.9 13.6 124 Kendall R.S. 7740 15.4 11.5 134 15.9 14.0 114 Loomis Park 8240 18.6 13.8 135 18.9 17.0 111 New Fork Lake 8340 12.1 10.3 117 11.5 10.6 108 Pocket Creek 9360 9.0 -M * 9.2 -M * Snider Basin 8060 12.9 12.3 105 15.0 14.0 107 Spring Creek Divide 9000 26.8 22.5 119 24.9 23.5 106 Triple Peak 8500 31.5 21.9 144 31.9 25.0 128 ----- ----- Basin Index (%) 127 112 LOWER GREEN RIVER Blacks Fork Jct 8869 7.2 -M * 8.8 -M * Buck Pasture 9632 11.6 -M * 13.1 -M * EF Blacks Fork GS 9360 10.4 -M * 6.0 -M * Hams Fork 7840 9.2 10.7 86 9.5 11.2 85 Hewinta 9500 7.3 10.9 67 11.2 13.9 81 Hickerson Park 9122 6.5 7.9 82 7.9 10.1 78 Hole-in-Rock 9168 6.9 7.0 99 8.4 9.7 87 Indian Creek 9425 22.0 24.6 89 16.0 22.3 72 Kelley R.S. 8180 13.6 14.8 92 14.7 17.8 83 Spirit Lk 10235 10.3 -M * 11.8 -M * Steel Creek Park 10158 13.4 15.7 85 13.6 16.3 83 ----- ----- Basin Index (%) 86 80 UPPER BEAR RIVER Bear River RS 8777 5.3 -M * 10.4 -M * Bug Lake 7987 14.5 18.3 79 15.9 19.2 83 Burts Miller Ranch 8000 3.2 -M * 6.2 -M * Chalk Creek #1 9171 14.9 24.3 61 16.1 24.9 65 Hayden Fork 9130 10.6 15.4 69 16.0 20.9 77 Kelley R.S. 8180 13.6 14.8 92 14.7 17.8 83 Lily Lake 9133 9.2 12.6 73 11.2 17.0 66 Monte Cristo 8932 21.4 27.6 78 21.5 25.6 84 Salt River Summit 7640 11.3 12.9 88 13.0 16.4 79 ----- ----- Basin Index (%) 76 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.