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 SATURDAY: APRIL 7 , 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 22.0 20.6 107 Black Bear 8170 43.6 37.2 117 41.9 37.8 111 Blind Bull Sum 8650 34.5 23.2 149 20.9 19.3 108 Cottonwood Creek 7670 23.2 21.0 110 26.7 24.3 110 East Rim Divide 7930 12.9 10.2 126 12.8 11.6 110 Grand Targhee 9260 47.8 38.5 124 30.0 30.6 98 Granite Creek 6770 18.2 14.5 126 22.1 19.5 113 Grassy Lake 7265 33.4 31.5 106 36.4 35.5 103 Gros Ventre Summit 8750 16.7 12.9 129 15.8 12.8 123 Gunsight Pass 9820 18.0 13.8 130 17.2 13.7 126 Lewis Lake Divide 7850 41.5 29.9 139 39.8 34.9 114 Phillips Bench 8200 29.7 25.4 117 28.9 27.8 104 Salt River Summit 7640 11.4 12.8 89 13.4 16.5 81 Snake River Station 6920 18.8 14.9 126 24.3 22.1 110 Spring Creek Divide 9000 27.2 22.5 121 25.4 23.5 108 Thumb Divide 7980 20.6 14.7 140 19.8 18.4 108 Togwotee Pass 9580 33.2 22.1 150 32.7 24.0 136 Two Ocean Plateau 9240 39.0 26.0 150 30.0 26.8 112 Willow Creek 8080 35.2 28.4 124 36.4 33.2 110 Younts Peak 8350 -M 14.3 * -M 15.6 * ----- ----- Basin Index (%) 126 110 MADISON-GALLATIN Black Bear 8170 43.6 37.2 117 41.9 37.8 111 Canyon 7870 17.3 12.4 140 19.9 16.0 124 Madison Plateau 7750 27.0 21.5 126 27.6 26.0 106 West Yellowstone 6700 12.7 9.5 134 17.4 14.1 123 Whiskey Creek 6800 16.5 14.8 111 19.1 19.9 96 ----- ----- Basin Index (%) 123 111 YELLOWSTONE Beartooth Lake 9360 40.0 21.3 188 36.5 19.4 188 Burnt Mtn 5880 8.1 4.5 180 15.1 12.9 117 Canyon 7870 17.3 12.4 140 19.9 16.0 124 Cole Creek 7850 15.4 14.6 105 -M 12.8 * Evening Star 9200 43.1 23.8 181 42.2 26.9 157 Fisher Creek 9100 53.3 31.2 171 47.4 31.2 152 Northeast Entrance 7350 14.5 9.0 161 18.6 12.0 155 Parker Peak 9400 35.1 19.4 181 29.8 17.4 171 Sylvan Lake 8420 26.9 19.4 139 28.6 21.9 131 Thumb Divide 7980 20.6 14.7 140 19.8 18.4 108 Two Ocean Plateau 9240 39.0 26.0 150 30.0 26.8 112 White Mill 8700 42.3 22.2 191 32.8 23.3 141 Wolverine 7650 23.1 9.6 241 21.7 12.0 181 ----- ----- Basin Index (%) 166 144 WIND RIVER Burroughs Creek 8750 16.6 -M * 18.3 -M * Castle Creek 8400 8.5 -M * 10.1 -M * Cold Springs 9630 10.2 6.7 152 10.2 9.9 103 Deer Park 9700 12.7 15.6 81 15.7 19.8 79 Hobbs Park 10100 17.8 14.1 126 15.4 13.4 115 Kirwin 9550 20.3 9.6 211 18.3 11.4 161 Little Warm 9370 16.9 10.2 166 17.5 12.7 138 Owl Creek 8975 4.5 5.8 78 6.3 6.0 105 South Pass 9040 12.1 15.2 80 -M 17.3 * St. Lawrence Alt 8620 2.3 6.9 33 8.5 8.9 96 Togwotee Pass 9580 33.2 22.1 150 32.7 24.0 136 Townsend Creek 8700 7.3 9.7 75 9.3 12.0 78 ----- ----- Basin Index (%) 118 113 BIGHORN BASIN Bald Mtn. 9380 22.2 19.1 116 16.4 16.8 98 Bear Trap Meadow 8200 -M 4.9 * 11.4 8.5 134 Bone Springs Div 9350 20.5 16.9 121 15.7 15.4 102 Grave Springs 8550 7.9 9.4 84 -M 10.6 * Kirwin 9550 20.3 9.6 211 18.3 11.4 161 Marquette 8760 6.7 -M * 10.3 -M * Middle Powder 7760 10.4 12.0 87 -M 11.6 * Owl Creek 8975 4.5 5.8 78 6.3 6.0 105 Powder River Pass 9480 17.0 10.2 167 16.2 12.5 130 Shell Creek 9580 22.1 15.1 146 16.9 13.6 124 Timber Creek 7950 3.7 4.9 76 -M 7.3 * ----- ----- Basin Index (%) 125 120 SHOSHONE RIVER Blackwater 9780 35.7 22.6 158 -M 20.3 * Evening Star 9200 43.1 23.8 181 42.2 26.9 157 Marquette 8760 6.7 -M * 10.3 -M * Sylvan Road 7120 15.5 10.8 144 22.9 16.5 139 Younts Peak 8350 -M 14.3 * -M 15.6 * ----- ----- Basin Index (%) 165 150* POWDER RIVER Bear Trap Meadow 8200 -M 4.9 * 11.4 8.5 134 Cloud Peak Reservoir 9860 16.9 14.8 114 15.3 13.2 116 Grave Springs 8550 7.9 9.4 84 -M 10.6 * Hansen Sawmill 8360 9.8 6.1 161 11.3 8.5 133 Middle Powder 7760 10.4 12.0 87 -M 11.6 * Powder River Pass 9480 17.0 10.2 167 16.2 12.5 130 Soldier Park 8720 8.6 -M * 10.8 -M * ----- ----- Basin Index (%) 118 127 TONGUE RIVER Big Goose 7990 9.3 9.6 97 9.6 11.4 84 Bone Springs Div 9350 20.5 16.9 121 15.7 15.4 102 Burgess Junction 7880 11.1 11.9 93 9.5 12.3 77 Dome Lake 8880 16.1 11.8 136 13.1 13.5 97 Little Goose 8870 11.1 -M * 13.1 -M * Sucker Creek 8880 12.1 12.1 100 9.8 14.3 69 Tie Creek 6870 6.2 5.6 111 10.2 11.7 87 ----- ----- Basin Index (%) 111 86 BELLE FOURCHE Cole Canyon 5910 -M 5.1 * 11.0 9.5 116 ----- ----- Basin Index (%) * 116 CHEYENNE RIVER BASIN Blind Park 6890 9.3 7.0 133 12.3 11.8 104 North Rapid Creek 6130 8.1 6.5 125 9.5 9.9 96 ----- ----- Basin Index (%) 129 100 UPPER N. PLATTE Arapaho Ridge 10960 20.6 20.9 99 20.0 22.3 90 Blackhall Mtn 9820 28.8 -M * 27.5 -M * Columbine 9160 22.8 23.4 97 24.4 25.4 96 Divide Peak 8880 15.1 19.9 76 18.7 21.3 88 Joe Wright 10120 20.2 21.2 95 29.8 25.6 116 Laprele Creek 8375 6.9 9.4 73 8.3 12.5 66 Med Bow 10500 42.3 -M * 30.9 -M * North French Creek 10130 29.6 29.4 101 28.6 26.6 108 Never Summer 10280 19.6 20.3 97 16.0 -M * Old Battle 10000 26.1 31.3 83 24.5 34.7 71 Rawah 9020 11.6 10.6 109 15.3 14.2 108 Sage Creek Basin 7850 8.2 11.9 69 10.9 14.6 75 Sand Lake 10050 28.3 28.8 98 24.1 24.6 98 South Brush Creek 8440 11.7 11.9 98 12.6 15.1 83 Tower 10500 37.5 45.8 82 -M 39.6 * Webber Springs 9250 19.1 23.1 83 21.9 26.6 82 Willow Creek Pass 9540 13.3 12.2 109 14.2 13.3 107 Zirkel 9340 27.7 26.3 105 32.0 28.4 113 ----- ----- Basin Index (%) 92 93 SWEETWATER Deer Park 9700 12.7 15.6 81 15.7 19.8 79 Larsen Creek 9000 11.6 11.6 100 11.7 -M * South Pass 9040 12.1 15.2 80 -M 17.3 * ----- ----- Basin Index (%) 86 79* LOWER N. PLATTE Casper Mtn. 7900 8.1 14.3 57 6.7 15.0 45 Laprele Creek 8375 6.9 9.4 73 8.3 12.5 66 Reno Hill 8400 10.2 14.0 73 11.4 15.5 74 Windy Peak 7900 6.7 7.7 87 8.3 10.5 79 ----- ----- Basin Index (%) 70 65 LARAMIE RIVER Brooklyn Lake 10240 26.4 21.8 121 26.1 21.0 124 Cinnabar Park 9574 21.8 21.2 103 25.3 24.0 105 Crow Creek 8330 4.8 7.0 69 11.6 10.8 107 Deadman Hill 10220 21.0 16.1 130 20.0 17.2 116 Rawah 9020 11.6 10.6 109 15.3 14.2 108 Roach 9700 14.0 16.6 84 17.5 19.1 92 ----- ----- Basin Index (%) 107 109 S. PLATTE Black Mountain 8920 10.9 -M * 13.7 -M * Crow Creek 8330 4.8 7.0 69 11.6 10.8 107 Deadman Hill 10220 21.0 16.1 130 20.0 17.2 116 ----- ----- Basin Index (%) 112 113 LITTLE SNAKE RIVER Battle Mountain 7440 6.1 9.5 64 10.9 14.9 73 Divide Peak 8880 15.1 19.9 76 18.7 21.3 88 Elk River 8700 15.9 19.2 83 16.8 19.9 84 Little Snake River 8915 22.4 25.2 89 28.5 29.7 96 Old Battle 10000 26.1 31.3 83 24.5 34.7 71 Sage Creek Basin 7850 8.2 11.9 69 10.9 14.6 75 Sandstone RS 8150 9.1 12.8 71 9.4 18.2 52 Whiskey Park 8950 25.5 27.4 93 26.2 27.8 94 ----- ----- Basin Index (%) 82 81 UPPER GREEN RIVER Big Sandy Opening 9080 13.6 12.6 108 13.4 13.1 102 Blind Bull Sum 8650 34.5 23.2 149 20.9 19.3 108 East Rim Divide 7930 12.9 10.2 126 12.8 11.6 110 Elkhart Park G.S. 9400 12.7 12.3 103 12.1 13.2 92 Gros Ventre Summit 8750 16.7 12.9 129 15.8 12.8 123 Gunsight Pass 9820 18.0 13.8 130 17.2 13.7 126 Kendall R.S. 7740 15.5 11.4 136 16.2 14.1 115 Loomis Park 8240 18.9 13.8 137 19.1 17.1 112 New Fork Lake 8340 12.1 10.3 117 11.6 10.7 108 Pocket Creek 9360 9.4 -M * 9.4 -M * Snider Basin 8060 13.1 12.3 107 15.1 14.0 108 Spring Creek Divide 9000 27.2 22.5 121 25.4 23.5 108 Triple Peak 8500 32.3 21.8 148 32.3 25.0 129 ----- ----- Basin Index (%) 128 113 LOWER GREEN RIVER Blacks Fork Jct 8869 6.9 -M * 8.9 -M * Buck Pasture 9632 11.7 -M * 13.2 -M * EF Blacks Fork GS 9360 10.4 -M * 6.2 -M * Hams Fork 7840 9.2 10.6 87 9.8 11.3 87 Hewinta 9500 7.2 10.9 66 11.4 14.0 81 Hickerson Park 9122 6.5 7.9 82 8.0 10.2 78 Hole-in-Rock 9168 6.7 7.0 96 8.4 9.7 87 Indian Creek 9425 22.8 24.7 92 16.7 22.3 75 Kelley R.S. 8180 14.0 14.7 95 15.1 17.9 84 Spirit Lk 10235 10.6 -M * 12.0 -M * Steel Creek Park 10158 13.6 15.8 86 13.9 16.4 85 ----- ----- Basin Index (%) 87 82 UPPER BEAR RIVER Bear River RS 8777 5.0 -M * 10.5 -M * Bug Lake 7987 14.6 18.4 79 16.3 19.2 85 Burts Miller Ranch 8000 2.8 -M * 6.3 -M * Chalk Creek #1 9171 15.0 24.4 61 16.3 25.0 65 Hayden Fork 9130 10.3 15.4 67 16.2 21.0 77 Kelley R.S. 8180 14.0 14.7 95 15.1 17.9 84 Lily Lake 9133 9.2 12.6 73 11.3 17.0 66 Monte Cristo 8932 22.2 27.7 80 21.9 25.7 85 Salt River Summit 7640 11.4 12.8 89 13.4 16.5 81 ----- ----- Basin Index (%) 77 78 ----------------------------------------------------------------------------- -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.