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 THURSDAY: APRIL 5 , 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 21.0 20.5 102 Black Bear 8170 42.5 37.1 115 40.9 37.4 109 Blind Bull Sum 8650 33.6 23.1 145 19.8 19.2 103 Cottonwood Creek 7670 22.3 21.1 106 25.6 24.2 106 East Rim Divide 7930 12.7 10.2 125 12.6 11.5 110 Grand Targhee 9260 45.3 37.9 120 28.8 30.4 95 Granite Creek 6770 18.6 14.7 127 21.6 19.4 111 Grassy Lake 7265 31.7 31.6 100 34.7 35.3 98 Gros Ventre Summit 8750 16.4 13.0 126 15.5 12.7 122 Gunsight Pass 9820 17.5 13.6 129 16.7 13.5 124 Lewis Lake Divide 7850 39.5 29.7 133 38.4 34.7 111 Phillips Bench 8200 28.8 24.9 116 28.3 27.6 103 Salt River Summit 7640 11.2 12.9 87 12.9 16.4 79 Snake River Station 6920 19.1 15.0 127 23.3 22.0 106 Spring Creek Divide 9000 26.5 22.5 118 24.7 23.4 106 Thumb Divide 7980 19.9 14.7 135 19.3 18.2 106 Togwotee Pass 9580 32.2 21.9 147 32.5 23.8 137 Two Ocean Plateau 9240 37.7 25.8 146 29.4 26.6 111 Willow Creek 8080 34.0 28.3 120 35.2 33.0 107 Younts Peak 8350 -M 14.3 * -M 15.4 * ----- ----- Basin Index (%) 123 107 MADISON-GALLATIN Black Bear 8170 42.5 37.1 115 40.9 37.4 109 Canyon 7870 17.1 12.5 137 19.4 15.9 122 Madison Plateau 7750 26.3 21.4 123 27.0 25.8 105 West Yellowstone 6700 13.5 9.9 136 17.0 13.9 122 Whiskey Creek 6800 16.3 14.9 109 19.1 19.7 97 ----- ----- Basin Index (%) 121 109 YELLOWSTONE Beartooth Lake 9360 39.2 21.2 185 35.7 19.3 185 Burnt Mtn 5880 7.7 4.6 167 14.7 12.7 116 Canyon 7870 17.1 12.5 137 19.4 15.9 122 Cole Creek 7850 14.9 14.3 104 -M 12.6 * Evening Star 9200 41.3 23.8 174 42.0 26.7 157 Fisher Creek 9100 52.3 30.9 169 46.4 31.0 150 Northeast Entrance 7350 14.2 9.2 154 18.1 11.9 152 Parker Peak 9400 34.1 19.2 178 29.3 17.2 170 Sylvan Lake 8420 25.8 19.3 134 27.5 21.8 126 Thumb Divide 7980 19.9 14.7 135 19.3 18.2 106 Two Ocean Plateau 9240 37.7 25.8 146 29.4 26.6 111 White Mill 8700 41.0 22.0 186 31.6 23.2 136 Wolverine 7650 22.3 9.4 237 21.2 11.9 178 ----- ----- Basin Index (%) 162 142 WIND RIVER Burroughs Creek 8750 16.0 -M * 17.7 -M * Castle Creek 8400 8.3 -M * 9.8 -M * Cold Springs 9630 10.1 6.9 146 10.2 9.8 104 Deer Park 9700 12.6 15.2 83 15.6 19.4 80 Hobbs Park 10100 17.7 13.9 127 15.3 13.2 116 Kirwin 9550 20.1 9.6 209 18.1 11.3 160 Little Warm 9370 16.4 10.2 161 17.2 12.6 137 Owl Creek 8975 4.5 5.8 78 6.1 5.9 103 South Pass 9040 12.0 15.1 79 8.7 17.1 51 St. Lawrence Alt 8620 2.9 6.8 43 8.6 8.8 98 Togwotee Pass 9580 32.2 21.9 147 32.5 23.8 137 Townsend Creek 8700 7.3 9.4 78 9.5 11.8 81 ----- ----- Basin Index (%) 118 106 BIGHORN BASIN Bald Mtn. 9380 21.3 19.0 112 15.5 16.6 93 Bear Trap Meadow 8200 -M 5.0 * 11.2 8.3 135 Bone Springs Div 9350 19.5 16.6 117 15.0 15.2 99 Grave Springs 8550 7.9 9.2 86 -M 10.3 * Kirwin 9550 20.1 9.6 209 18.1 11.3 160 Marquette 8760 6.6 -M * 10.3 -M * Middle Powder 7760 10.3 11.8 87 6.7 11.4 59 Owl Creek 8975 4.5 5.8 78 6.1 5.9 103 Powder River Pass 9480 16.5 10.1 163 15.7 12.3 128 Shell Creek 9580 21.3 14.8 144 16.1 13.5 119 Timber Creek 7950 3.7 4.9 76 -M 7.2 * ----- ----- Basin Index (%) 123 110 SHOSHONE RIVER Blackwater 9780 34.6 22.4 154 32.0 20.1 159 Evening Star 9200 41.3 23.8 174 42.0 26.7 157 Marquette 8760 6.6 -M * 10.3 -M * Sylvan Road 7120 14.8 10.9 136 21.9 16.4 134 Younts Peak 8350 -M 14.3 * -M 15.4 * ----- ----- Basin Index (%) 159 152 POWDER RIVER Bear Trap Meadow 8200 -M 5.0 * 11.2 8.3 135 Cloud Peak Reservoir 9860 16.6 14.6 114 15.1 13.0 116 Grave Springs 8550 7.9 9.2 86 -M 10.3 * Hansen Sawmill 8360 9.4 6.2 152 10.9 8.4 130 Middle Powder 7760 10.3 11.8 87 6.7 11.4 59 Powder River Pass 9480 16.5 10.1 163 15.7 12.3 128 Soldier Park 8720 8.3 -M * 10.7 -M * ----- ----- Basin Index (%) 117 112 TONGUE RIVER Big Goose 7990 9.0 9.4 96 9.4 11.2 84 Bone Springs Div 9350 19.5 16.6 117 15.0 15.2 99 Burgess Junction 7880 10.6 11.7 91 9.2 12.1 76 Dome Lake 8880 15.6 11.7 133 12.6 13.3 95 Little Goose 8870 10.7 -M * 12.7 -M * Sucker Creek 8880 11.7 11.9 98 9.4 14.1 67 Tie Creek 6870 5.7 5.5 104 9.8 11.4 86 ----- ----- Basin Index (%) 108 85 BELLE FOURCHE Cole Canyon 5910 -M 5.5 * 10.5 9.2 114 ----- ----- Basin Index (%) * 114 CHEYENNE RIVER BASIN Blind Park 6890 8.6 7.1 121 11.7 11.6 101 North Rapid Creek 6130 7.8 6.7 116 9.2 9.6 96 ----- ----- Basin Index (%) 119 99 UPPER N. PLATTE Arapaho Ridge 10960 19.6 20.6 95 19.2 22.0 87 Blackhall Mtn 9820 27.8 -M * 26.8 -M * Columbine 9160 21.6 23.3 93 23.2 25.1 92 Divide Peak 8880 14.0 19.8 71 17.7 21.1 84 Joe Wright 10120 19.2 20.8 92 28.8 25.4 113 Laprele Creek 8375 6.6 9.4 70 8.0 12.3 65 Med Bow 10500 40.6 -M * 30.8 -M * North French Creek 10130 28.1 29.0 97 27.3 26.3 104 Never Summer 10280 18.7 20.2 93 15.4 -M * Old Battle 10000 25.1 30.9 81 23.7 34.4 69 Rawah 9020 11.2 10.5 107 15.0 13.9 108 Sage Creek Basin 7850 8.3 12.4 67 10.5 14.2 74 Sand Lake 10050 26.9 28.5 94 23.0 24.3 95 South Brush Creek 8440 11.2 12.0 93 12.2 15.0 81 Tower 10500 35.0 45.3 77 26.4 39.2 67 Webber Springs 9250 18.6 23.0 81 21.4 26.3 81 Willow Creek Pass 9540 13.0 12.0 108 13.9 13.2 105 Zirkel 9340 27.1 26.3 103 31.0 27.9 111 ----- ----- Basin Index (%) 88 88 SWEETWATER Deer Park 9700 12.6 15.2 83 15.6 19.4 80 Larsen Creek 9000 11.2 11.8 95 11.4 -M * South Pass 9040 12.0 15.1 79 8.7 17.1 51 ----- ----- Basin Index (%) 85 67 LOWER N. PLATTE Casper Mtn. 7900 8.0 14.2 56 6.9 14.6 47 Laprele Creek 8375 6.6 9.4 70 8.0 12.3 65 Reno Hill 8400 10.2 13.9 73 11.5 15.1 76 Windy Peak 7900 6.3 7.8 81 8.3 10.3 81 ----- ----- Basin Index (%) 69 66 LARAMIE RIVER Brooklyn Lake 10240 25.4 21.3 119 25.2 20.8 121 Cinnabar Park 9574 21.0 20.9 100 24.6 23.8 103 Crow Creek 8330 4.1 7.0 59 10.8 10.6 102 Deadman Hill 10220 20.5 15.9 129 19.6 17.0 115 Rawah 9020 11.2 10.5 107 15.0 13.9 108 Roach 9700 13.6 16.3 83 17.0 18.9 90 ----- ----- Basin Index (%) 104 107 S. PLATTE Black Mountain 8920 10.6 -M * 13.4 -M * Crow Creek 8330 4.1 7.0 59 10.8 10.6 102 Deadman Hill 10220 20.5 15.9 129 19.6 17.0 115 ----- ----- Basin Index (%) 107 110 LITTLE SNAKE RIVER Battle Mountain 7440 5.6 10.1 55 10.4 14.8 70 Divide Peak 8880 14.0 19.8 71 17.7 21.1 84 Elk River 8700 15.2 19.1 80 16.4 19.7 83 Little Snake River 8915 21.4 24.6 87 27.3 29.1 94 Old Battle 10000 25.1 30.9 81 23.7 34.4 69 Sage Creek Basin 7850 8.3 12.4 67 10.5 14.2 74 Sandstone RS 8150 8.7 12.8 68 9.2 18.0 51 Whiskey Park 8950 24.3 27.1 90 25.2 27.4 92 ----- ----- Basin Index (%) 78 79 UPPER GREEN RIVER Big Sandy Opening 9080 13.2 12.5 106 13.1 13.0 101 Blind Bull Sum 8650 33.6 23.1 145 19.8 19.2 103 East Rim Divide 7930 12.7 10.2 125 12.6 11.5 110 Elkhart Park G.S. 9400 12.4 12.2 102 12.0 13.0 92 Gros Ventre Summit 8750 16.4 13.0 126 15.5 12.7 122 Gunsight Pass 9820 17.5 13.6 129 16.7 13.5 124 Kendall R.S. 7740 15.3 11.5 133 15.8 14.0 113 Loomis Park 8240 18.4 13.9 132 18.7 17.0 110 New Fork Lake 8340 11.8 10.3 115 11.5 10.6 108 Pocket Creek 9360 8.9 -M * 9.1 -M * Snider Basin 8060 12.8 12.3 104 15.0 14.0 107 Spring Creek Divide 9000 26.5 22.5 118 24.7 23.4 106 Triple Peak 8500 31.0 21.9 142 31.6 24.9 127 ----- ----- Basin Index (%) 125 111 LOWER GREEN RIVER Blacks Fork Jct 8869 7.5 -M * 8.8 -M * Buck Pasture 9632 11.6 -M * 13.0 -M * EF Blacks Fork GS 9360 10.5 -M * -M -M * Hams Fork 7840 9.3 10.9 85 9.5 11.2 85 Hewinta 9500 7.4 11.0 67 11.2 13.8 81 Hickerson Park 9122 6.8 7.8 87 7.8 10.1 77 Hole-in-Rock 9168 7.2 7.0 103 8.3 9.5 87 Indian Creek 9425 21.7 24.5 89 15.8 22.2 71 Kelley R.S. 8180 13.5 14.9 91 14.7 17.8 83 Spirit Lk 10235 10.5 -M * 11.7 -M * Steel Creek Park 10158 13.1 15.6 84 13.6 16.2 84 ----- ----- Basin Index (%) 86 80 UPPER BEAR RIVER Bear River RS 8777 5.9 -M * 10.4 -M * Bug Lake 7987 14.8 18.3 81 15.9 19.1 83 Burts Miller Ranch 8000 4.0 -M * 6.2 -M * Chalk Creek #1 9171 15.0 24.1 62 16.1 24.8 65 Hayden Fork 9130 11.3 15.4 73 15.9 20.7 77 Kelley R.S. 8180 13.5 14.9 91 14.7 17.8 83 Lily Lake 9133 9.4 12.5 75 11.2 16.8 67 Monte Cristo 8932 21.4 27.4 78 21.4 25.5 84 Salt River Summit 7640 11.2 12.9 87 12.9 16.4 79 ----- ----- Basin Index (%) 77 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.