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 1 , 2018 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 17.1 14.8 116 20.0 20.2 99 Black Bear 8170 40.9 36.3 113 39.9 36.6 109 Blind Bull Sum 8650 31.8 22.4 142 19.0 18.8 101 Cottonwood Creek 7670 21.4 21.2 101 24.6 23.7 104 East Rim Divide 7930 12.0 10.0 120 12.0 11.3 106 Grand Targhee 9260 45.4 36.5 124 28.5 29.4 97 Granite Creek 6770 17.9 14.9 120 20.5 19.1 107 Grassy Lake 7265 31.3 31.6 99 34.2 34.6 99 Gros Ventre Summit 8750 15.3 12.9 119 14.5 12.4 117 Gunsight Pass 9820 16.3 13.4 122 15.8 13.2 120 Lewis Lake Divide 7850 38.3 29.5 130 37.4 34.1 110 Phillips Bench 8200 27.8 24.2 115 27.4 27.1 101 Salt River Summit 7640 11.1 12.9 86 12.7 16.0 79 Snake River Station 6920 18.4 15.5 119 22.9 21.6 106 Spring Creek Divide 9000 26.2 22.5 116 24.2 22.9 106 Thumb Divide 7980 18.9 14.9 127 18.2 17.8 102 Togwotee Pass 9580 30.8 21.6 143 31.1 23.3 133 Two Ocean Plateau 9240 36.0 25.6 141 28.2 26.2 108 Willow Creek 8080 32.8 27.8 118 34.1 32.2 106 Younts Peak 8350 -M 14.1 * -M 15.2 * ----- ----- Basin Index (%) 120 106 MADISON-GALLATIN Black Bear 8170 40.9 36.3 113 39.9 36.6 109 Canyon 7870 16.6 12.3 135 19.0 15.5 123 Madison Plateau 7750 26.4 21.3 124 26.6 25.2 106 West Yellowstone 6700 13.4 10.2 131 16.8 13.5 124 Whiskey Creek 6800 16.3 15.0 109 19.0 19.4 98 ----- ----- Basin Index (%) 119 110 YELLOWSTONE Beartooth Lake 9360 37.1 21.0 177 33.6 18.9 178 Burnt Mtn 5880 6.8 4.4 155 13.5 12.1 112 Canyon 7870 16.6 12.3 135 19.0 15.5 123 Cole Creek 7850 13.6 13.5 101 -M 12.0 * Evening Star 9200 39.3 23.9 164 41.7 26.1 160 Fisher Creek 9100 50.4 30.1 167 44.5 30.4 146 Northeast Entrance 7350 13.8 9.6 144 17.6 11.7 150 Parker Peak 9400 32.3 18.8 172 28.0 16.9 166 Sylvan Lake 8420 24.2 19.2 126 25.6 21.3 120 Thumb Divide 7980 18.9 14.9 127 18.2 17.8 102 Two Ocean Plateau 9240 36.0 25.6 141 28.2 26.2 108 White Mill 8700 39.3 21.6 182 30.4 22.7 134 Wolverine 7650 20.4 9.1 224 19.7 11.7 168 ----- ----- Basin Index (%) 156 138 WIND RIVER Burroughs Creek 8750 15.7 -M * 17.2 -M * Castle Creek 8400 8.2 -M * 9.5 -M * Cold Springs 9630 9.5 7.1 134 9.7 9.5 102 Deer Park 9700 12.3 14.7 84 15.2 18.6 82 Hobbs Park 10100 16.9 13.4 126 14.4 12.5 115 Kirwin 9550 19.1 9.4 203 17.2 11.0 156 Little Warm 9370 15.4 10.2 151 15.9 12.3 129 Owl Creek 8975 4.4 5.5 80 6.0 5.7 105 South Pass 9040 11.8 14.9 79 8.4 16.6 51 St. Lawrence Alt 8620 3.0 6.8 44 8.3 8.5 98 Togwotee Pass 9580 30.8 21.6 143 31.1 23.3 133 Townsend Creek 8700 7.0 9.0 78 9.0 11.3 80 ----- ----- Basin Index (%) 116 105 BIGHORN BASIN Bald Mtn. 9380 20.5 18.6 110 14.6 16.3 90 Bear Trap Meadow 8200 -M 5.1 * 10.9 8.1 135 Bone Springs Div 9350 18.7 15.9 118 14.2 14.8 96 Grave Springs 8550 7.5 8.9 84 -M 10.0 * Kirwin 9550 19.1 9.4 203 17.2 11.0 156 Marquette 8760 5.7 -M * 9.4 -M * Middle Powder 7760 9.6 11.4 84 -M 11.1 * Owl Creek 8975 4.4 5.5 80 6.0 5.7 105 Powder River Pass 9480 16.3 10.0 163 15.4 12.0 128 Shell Creek 9580 20.7 14.5 143 15.7 13.2 119 Timber Creek 7950 3.4 4.8 71 -M 7.0 * ----- ----- Basin Index (%) 121 116 SHOSHONE RIVER Blackwater 9780 32.8 22.1 148 30.6 19.7 155 Evening Star 9200 39.3 23.9 164 41.7 26.1 160 Marquette 8760 5.7 -M * 9.4 -M * Sylvan Road 7120 13.5 11.1 122 20.2 16.1 125 Younts Peak 8350 -M 14.1 * -M 15.2 * ----- ----- Basin Index (%) 150 149 POWDER RIVER Bear Trap Meadow 8200 -M 5.1 * 10.9 8.1 135 Cloud Peak Reservoir 9860 15.8 14.1 112 14.2 12.6 113 Grave Springs 8550 7.5 8.9 84 -M 10.0 * Hansen Sawmill 8360 8.9 6.3 141 10.3 8.1 127 Middle Powder 7760 9.6 11.4 84 -M 11.1 * Powder River Pass 9480 16.3 10.0 163 15.4 12.0 128 Soldier Park 8720 7.5 -M * 10.0 -M * ----- ----- Basin Index (%) 115 125 TONGUE RIVER Big Goose 7990 8.2 8.9 92 8.5 10.6 80 Bone Springs Div 9350 18.7 15.9 118 14.2 14.8 96 Burgess Junction 7880 9.9 11.3 88 8.3 11.7 71 Dome Lake 8880 14.7 11.5 128 11.9 12.9 92 Little Goose 8870 10.0 -M * 12.0 -M * Sucker Creek 8880 10.9 11.4 96 8.5 13.6 62 Tie Creek 6870 4.9 5.4 91 9.0 10.9 83 ----- ----- Basin Index (%) 105 81 BELLE FOURCHE Cole Canyon 5910 7.6 5.8 131 9.8 8.8 111 ----- ----- Basin Index (%) 131 111 CHEYENNE RIVER BASIN Blind Park 6890 7.8 7.2 108 11.0 11.3 97 North Rapid Creek 6130 7.1 6.7 106 8.4 9.3 90 ----- ----- Basin Index (%) 107 94 UPPER N. PLATTE Arapaho Ridge 10960 19.5 19.8 98 19.1 21.3 90 Blackhall Mtn 9820 27.4 -M * 26.3 -M * Columbine 9160 22.3 22.8 98 22.8 24.5 93 Divide Peak 8880 14.1 19.5 72 17.4 20.5 85 Joe Wright 10120 18.8 20.2 93 28.1 24.6 114 Laprele Creek 8375 6.5 9.5 68 7.9 11.8 67 Med Bow 10500 39.4 -M * 30.8 -M * North French Creek 10130 27.3 28.0 98 26.4 25.7 103 Never Summer 10280 18.5 19.6 94 15.2 -M * Old Battle 10000 24.7 29.6 83 23.4 33.6 70 Rawah 9020 11.2 10.3 109 14.7 13.5 109 Sage Creek Basin 7850 8.4 12.7 66 10.2 13.9 73 Sand Lake 10050 26.0 27.5 95 22.0 23.6 93 South Brush Creek 8440 10.6 12.2 87 11.7 14.6 80 Tower 10500 34.5 44.0 78 -M 38.1 * Webber Springs 9250 18.1 23.0 79 20.9 25.6 82 Willow Creek Pass 9540 13.0 11.8 110 13.9 12.8 109 Zirkel 9340 26.8 26.4 102 30.4 27.2 112 ----- ----- Basin Index (%) 89 92 SWEETWATER Deer Park 9700 12.3 14.7 84 15.2 18.6 82 Larsen Creek 9000 11.1 12.2 91 11.3 -M * South Pass 9040 11.8 14.9 79 8.4 16.6 51 ----- ----- Basin Index (%) 84 67 LOWER N. PLATTE Casper Mtn. 7900 7.8 13.4 58 6.6 14.0 47 Laprele Creek 8375 6.5 9.5 68 7.9 11.8 67 Reno Hill 8400 10.0 13.2 76 11.2 14.5 77 Windy Peak 7900 6.4 7.8 82 7.8 10.0 78 ----- ----- Basin Index (%) 70 67 LARAMIE RIVER Brooklyn Lake 10240 24.6 20.0 123 24.4 20.1 121 Cinnabar Park 9574 20.7 20.0 104 24.2 23.0 105 Crow Creek 8330 4.3 6.8 63 10.6 10.2 104 Deadman Hill 10220 20.1 15.6 129 19.1 16.4 116 Rawah 9020 11.2 10.3 109 14.7 13.5 109 Roach 9700 13.5 15.6 87 16.7 18.3 91 ----- ----- Basin Index (%) 107 108 S. PLATTE Black Mountain 8920 10.6 -M * 13.2 -M * Crow Creek 8330 4.3 6.8 63 10.6 10.2 104 Deadman Hill 10220 20.1 15.6 129 19.1 16.4 116 ----- ----- Basin Index (%) 109 112 LITTLE SNAKE RIVER Battle Mountain 7440 6.2 10.6 58 10.4 14.5 72 Divide Peak 8880 14.1 19.5 72 17.4 20.5 85 Elk River 8700 15.3 18.5 83 16.2 19.3 84 Little Snake River 8915 20.9 23.2 90 26.9 28.5 94 Old Battle 10000 24.7 29.6 83 23.4 33.6 70 Sage Creek Basin 7850 8.4 12.7 66 10.2 13.9 73 Sandstone RS 8150 9.0 13.1 69 8.9 17.7 50 Whiskey Park 8950 23.9 25.8 93 24.7 26.9 92 ----- ----- Basin Index (%) 80 79 UPPER GREEN RIVER Big Sandy Opening 9080 13.1 12.3 107 12.9 12.7 102 Blind Bull Sum 8650 31.8 22.4 142 19.0 18.8 101 East Rim Divide 7930 12.0 10.0 120 12.0 11.3 106 Elkhart Park G.S. 9400 12.1 12.1 100 11.7 12.8 91 Gros Ventre Summit 8750 15.3 12.9 119 14.5 12.4 117 Gunsight Pass 9820 16.3 13.4 122 15.8 13.2 120 Kendall R.S. 7740 14.7 11.4 129 15.2 13.7 111 Loomis Park 8240 17.5 14.3 122 17.9 16.7 107 New Fork Lake 8340 11.7 10.3 114 11.1 10.4 107 Pocket Creek 9360 8.6 -M * 8.9 -M * Snider Basin 8060 12.5 12.2 102 14.5 13.7 106 Spring Creek Divide 9000 26.2 22.5 116 24.2 22.9 106 Triple Peak 8500 29.5 21.7 136 30.0 24.4 123 ----- ----- Basin Index (%) 121 109 LOWER GREEN RIVER Blacks Fork Jct 8869 7.4 -M * 8.6 -M * Buck Pasture 9632 12.0 -M * 12.8 -M * EF Blacks Fork GS 9360 10.6 -M * 6.2 -M * Hams Fork 7840 9.2 10.8 85 9.3 10.9 85 Hewinta 9500 7.9 10.9 72 11.1 13.4 83 Hickerson Park 9122 6.8 7.5 91 7.8 9.7 80 Hole-in-Rock 9168 7.1 7.0 101 8.2 9.2 89 Indian Creek 9425 21.2 23.9 89 15.6 21.7 72 Kelley R.S. 8180 13.2 14.9 89 14.3 17.4 82 Spirit Lk 10235 10.4 -M * 11.7 -M * Steel Creek Park 10158 14.5 15.3 95 13.4 15.7 85 ----- ----- Basin Index (%) 88 81 UPPER BEAR RIVER Bear River RS 8777 7.0 -M * 10.3 -M * Bug Lake 7987 14.8 18.1 82 15.6 18.7 83 Burts Miller Ranch 8000 4.4 -M * 6.3 -M * Chalk Creek #1 9171 14.7 23.4 63 15.8 24.1 66 Hayden Fork 9130 12.0 15.1 79 15.7 20.1 78 Kelley R.S. 8180 13.2 14.9 89 14.3 17.4 82 Lily Lake 9133 9.2 12.1 76 11.1 16.3 68 Monte Cristo 8932 21.4 26.3 81 21.2 24.9 85 Salt River Summit 7640 11.1 12.9 86 12.7 16.0 79 ----- ----- Basin Index (%) 79 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.