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 8 , 2018 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 18.4 15.2 121 22.5 20.7 109 Black Bear 8170 43.8 37.1 118 42.6 37.9 112 Blind Bull Sum 8650 35.2 23.3 151 21.1 19.3 109 Cottonwood Creek 7670 23.4 20.9 112 27.2 24.4 111 East Rim Divide 7930 12.9 10.2 126 12.9 11.7 110 Grand Targhee 9260 48.7 38.7 126 30.2 30.7 98 Granite Creek 6770 18.4 14.3 129 22.7 19.5 116 Grassy Lake 7265 33.6 31.4 107 36.8 35.6 103 Gros Ventre Summit 8750 17.0 12.9 132 16.0 12.8 125 Gunsight Pass 9820 18.3 13.9 132 17.4 13.8 126 Lewis Lake Divide 7850 42.3 30.0 141 40.6 35.1 116 Phillips Bench 8200 30.4 25.5 119 29.4 27.9 105 Salt River Summit 7640 11.3 12.7 89 13.7 16.5 83 Snake River Station 6920 18.8 14.8 127 24.6 22.2 111 Spring Creek Divide 9000 28.2 22.5 125 25.8 23.6 109 Thumb Divide 7980 21.0 14.7 143 20.2 18.4 110 Togwotee Pass 9580 33.7 22.2 152 32.7 24.1 136 Two Ocean Plateau 9240 39.6 26.2 151 30.3 26.9 113 Willow Creek 8080 -M 28.4 * 36.6 33.3 110 Younts Peak 8350 -M 14.4 * -M 15.6 * ----- ----- Basin Index (%) 128 111 MADISON-GALLATIN Black Bear 8170 43.8 37.1 118 42.6 37.9 112 Canyon 7870 17.4 12.4 140 20.2 16.1 125 Madison Plateau 7750 27.4 21.6 127 27.9 26.1 107 West Yellowstone 6700 12.5 9.3 134 17.6 14.1 125 Whiskey Creek 6800 16.6 14.8 112 19.2 20.0 96 ----- ----- Basin Index (%) 124 112 YELLOWSTONE Beartooth Lake 9360 40.3 21.4 188 36.9 19.5 189 Burnt Mtn 5880 8.2 4.3 191 15.3 12.9 119 Canyon 7870 17.4 12.4 140 20.2 16.1 125 Cole Creek 7850 15.3 14.8 103 -M 12.9 * Evening Star 9200 43.4 23.8 182 42.2 27.1 156 Fisher Creek 9100 53.7 31.3 172 47.7 31.3 152 Northeast Entrance 7350 14.8 8.9 166 18.8 12.1 155 Parker Peak 9400 35.6 19.6 182 29.9 17.5 171 Sylvan Lake 8420 27.5 19.4 142 29.0 22.0 132 Thumb Divide 7980 21.0 14.7 143 20.2 18.4 110 Two Ocean Plateau 9240 39.6 26.2 151 30.3 26.9 113 White Mill 8700 42.6 22.3 191 32.9 23.4 141 Wolverine 7650 23.4 9.6 244 22.2 12.1 183 ----- ----- Basin Index (%) 167 144 WIND RIVER Burroughs Creek 8750 17.0 -M * 18.4 -M * Castle Creek 8400 8.7 -M * 10.3 -M * Cold Springs 9630 10.0 6.6 152 10.2 9.9 103 Deer Park 9700 13.0 15.8 82 15.8 19.9 79 Hobbs Park 10100 18.1 14.2 127 15.4 13.5 114 Kirwin 9550 20.6 9.6 215 18.4 11.5 160 Little Warm 9370 17.2 10.3 167 17.7 12.8 138 Owl Creek 8975 4.7 5.8 81 6.4 6.0 107 South Pass 9040 12.2 15.3 80 -M 17.3 * St. Lawrence Alt 8620 2.5 6.9 36 8.7 9.0 97 Togwotee Pass 9580 33.7 22.2 152 32.7 24.1 136 Townsend Creek 8700 7.3 9.7 75 9.5 12.0 79 ----- ----- Basin Index (%) 120 114 BIGHORN BASIN Bald Mtn. 9380 22.5 19.2 117 16.6 16.8 99 Bear Trap Meadow 8200 -M 4.9 * 11.5 8.6 134 Bone Springs Div 9350 20.7 16.9 122 16.0 15.5 103 Grave Springs 8550 8.1 9.5 85 -M 10.7 * Kirwin 9550 20.6 9.6 215 18.4 11.5 160 Marquette 8760 6.8 -M * 10.4 -M * Middle Powder 7760 10.5 12.1 87 6.8 11.7 58 Owl Creek 8975 4.7 5.8 81 6.4 6.0 107 Powder River Pass 9480 17.1 10.2 168 16.3 12.6 129 Shell Creek 9580 22.3 15.2 147 16.9 13.7 123 Timber Creek 7950 3.9 5.0 78 -M 7.3 * ----- ----- Basin Index (%) 126 113 SHOSHONE RIVER Blackwater 9780 36.3 22.7 160 -M 20.3 * Evening Star 9200 43.4 23.8 182 42.2 27.1 156 Marquette 8760 6.8 -M * 10.4 -M * Sylvan Road 7120 15.8 10.7 148 23.4 16.5 142 Younts Peak 8350 -M 14.4 * -M 15.6 * ----- ----- Basin Index (%) 167 150* POWDER RIVER Bear Trap Meadow 8200 -M 4.9 * 11.5 8.6 134 Cloud Peak Reservoir 9860 17.0 14.9 114 15.5 13.4 116 Grave Springs 8550 8.1 9.5 85 -M 10.7 * Hansen Sawmill 8360 10.1 6.1 166 11.5 8.6 134 Middle Powder 7760 10.5 12.1 87 6.8 11.7 58 Powder River Pass 9480 17.1 10.2 168 16.3 12.6 129 Soldier Park 8720 8.8 -M * 11.1 -M * ----- ----- Basin Index (%) 119 112 TONGUE RIVER Big Goose 7990 9.4 9.7 97 9.7 11.5 84 Bone Springs Div 9350 20.7 16.9 122 16.0 15.5 103 Burgess Junction 7880 11.3 12.0 94 9.6 12.3 78 Dome Lake 8880 16.3 11.8 138 13.2 13.6 97 Little Goose 8870 11.2 -M * 13.3 -M * Sucker Creek 8880 12.2 12.3 99 9.9 14.4 69 Tie Creek 6870 6.3 5.6 112 10.4 11.7 89 ----- ----- Basin Index (%) 112 87 BELLE FOURCHE Cole Canyon 5910 -M 4.9 * 11.1 9.6 116 ----- ----- Basin Index (%) * 116 CHEYENNE RIVER BASIN Blind Park 6890 9.5 6.9 138 12.5 11.9 105 North Rapid Creek 6130 8.3 6.4 130 9.8 10.0 98 ----- ----- Basin Index (%) 134 102 UPPER N. PLATTE Arapaho Ridge 10960 21.4 21.0 102 20.9 22.6 92 Blackhall Mtn 9820 29.3 -M * 28.0 -M * Columbine 9160 24.7 23.4 106 25.3 25.5 99 Divide Peak 8880 15.4 20.0 77 18.7 21.4 87 Joe Wright 10120 21.0 21.4 98 30.5 25.8 118 Laprele Creek 8375 6.9 9.4 73 8.5 12.5 68 Med Bow 10500 42.9 -M * 30.8 -M * North French Creek 10130 30.2 29.7 102 28.9 26.7 108 Never Summer 10280 20.3 20.4 100 16.6 -M * Old Battle 10000 26.4 31.5 84 24.8 34.9 71 Rawah 9020 11.7 10.6 110 15.4 14.4 107 Sage Creek Basin 7850 7.9 11.6 68 11.0 14.6 75 Sand Lake 10050 28.8 29.1 99 24.3 24.8 98 South Brush Creek 8440 11.7 11.8 99 12.7 15.2 84 Tower 10500 39.1 46.0 85 -M 39.8 * Webber Springs 9250 19.1 23.1 83 22.1 26.7 83 Willow Creek Pass 9540 13.4 12.2 110 14.5 13.4 108 Zirkel 9340 28.4 26.2 108 32.6 28.5 114 ----- ----- Basin Index (%) 94 95 SWEETWATER Deer Park 9700 13.0 15.8 82 15.8 19.9 79 Larsen Creek 9000 11.8 11.5 103 12.0 -M * South Pass 9040 12.2 15.3 80 -M 17.3 * ----- ----- Basin Index (%) 87 79* LOWER N. PLATTE Casper Mtn. 7900 8.2 14.4 57 7.1 15.1 47 Laprele Creek 8375 6.9 9.4 73 8.5 12.5 68 Reno Hill 8400 10.4 14.0 74 11.8 15.6 76 Windy Peak 7900 6.8 7.7 88 8.8 10.6 83 ----- ----- Basin Index (%) 71 67 LARAMIE RIVER Brooklyn Lake 10240 26.7 22.0 121 26.3 21.1 125 Cinnabar Park 9574 22.1 21.3 104 25.7 24.1 107 Crow Creek 8330 4.8 6.9 70 11.6 10.9 106 Deadman Hill 10220 21.3 16.2 131 20.2 17.3 117 Rawah 9020 11.7 10.6 110 15.4 14.4 107 Roach 9700 14.2 16.6 86 17.7 19.1 93 ----- ----- Basin Index (%) 108 109 S. PLATTE Black Mountain 8920 10.7 -M * 13.8 -M * Crow Creek 8330 4.8 6.9 70 11.6 10.9 106 Deadman Hill 10220 21.3 16.2 131 20.2 17.3 117 ----- ----- Basin Index (%) 113 113 LITTLE SNAKE RIVER Battle Mountain 7440 5.9 9.3 63 11.0 15.0 73 Divide Peak 8880 15.4 20.0 77 18.7 21.4 87 Elk River 8700 16.0 19.1 84 17.0 20.0 85 Little Snake River 8915 22.7 25.5 89 29.0 29.9 97 Old Battle 10000 26.4 31.5 84 24.8 34.9 71 Sage Creek Basin 7850 7.9 11.6 68 11.0 14.6 75 Sandstone RS 8150 9.1 12.8 71 9.5 18.3 52 Whiskey Park 8950 26.0 27.5 95 26.6 27.9 95 ----- ----- Basin Index (%) 82 81 UPPER GREEN RIVER Big Sandy Opening 9080 13.9 12.7 109 13.5 13.2 102 Blind Bull Sum 8650 35.2 23.3 151 21.1 19.3 109 East Rim Divide 7930 12.9 10.2 126 12.9 11.7 110 Elkhart Park G.S. 9400 12.9 12.3 105 12.2 13.2 92 Gros Ventre Summit 8750 17.0 12.9 132 16.0 12.8 125 Gunsight Pass 9820 18.3 13.9 132 17.4 13.8 126 Kendall R.S. 7740 15.6 11.4 137 16.5 14.1 117 Loomis Park 8240 18.9 13.8 137 19.3 17.2 112 New Fork Lake 8340 12.1 10.3 117 11.7 10.7 109 Pocket Creek 9360 9.6 -M * 9.6 -M * Snider Basin 8060 13.0 12.3 106 15.1 14.1 107 Spring Creek Divide 9000 28.2 22.5 125 25.8 23.6 109 Triple Peak 8500 33.1 21.8 152 32.8 25.1 131 ----- ----- Basin Index (%) 130 114 LOWER GREEN RIVER Blacks Fork Jct 8869 6.8 -M * 9.3 -M * Buck Pasture 9632 11.8 -M * 13.6 -M * EF Blacks Fork GS 9360 10.2 -M * 6.5 -M * Hams Fork 7840 9.0 10.5 86 9.9 11.3 88 Hewinta 9500 7.3 10.9 67 11.7 14.0 84 Hickerson Park 9122 6.4 7.9 81 8.2 10.2 80 Hole-in-Rock 9168 6.9 7.0 99 8.6 9.7 89 Indian Creek 9425 23.2 24.7 94 17.0 22.4 76 Kelley R.S. 8180 14.3 14.6 98 15.3 18.0 85 Spirit Lk 10235 10.5 -M * 12.1 -M * Steel Creek Park 10158 14.1 15.8 89 14.3 16.5 87 ----- ----- Basin Index (%) 89 83 UPPER BEAR RIVER Bear River RS 8777 4.8 -M * 10.8 -M * Bug Lake 7987 14.1 18.5 76 16.7 19.3 87 Burts Miller Ranch 8000 2.5 -M * 6.4 -M * Chalk Creek #1 9171 15.1 24.4 62 16.8 25.1 67 Hayden Fork 9130 10.3 15.3 67 16.8 21.1 80 Kelley R.S. 8180 14.3 14.6 98 15.3 18.0 85 Lily Lake 9133 9.2 12.7 72 11.7 17.1 68 Monte Cristo 8932 22.4 27.8 81 22.2 25.9 86 Salt River Summit 7640 11.3 12.7 89 13.7 16.5 83 ----- ----- Basin Index (%) 77 79 ----------------------------------------------------------------------------- -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.