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 WEDNESDAY: APRIL 4 , 2018 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 18.1 15.0 121 20.9 20.4 102 Black Bear 8170 42.9 37.0 116 40.7 37.3 109 Blind Bull Sum 8650 33.3 23.0 145 19.6 19.1 103 Cottonwood Creek 7670 22.3 21.2 105 25.5 24.1 106 East Rim Divide 7930 12.5 10.2 123 12.4 11.5 108 Grand Targhee 9260 45.2 37.6 120 28.7 30.2 95 Granite Creek 6770 18.6 14.7 127 21.5 19.3 111 Grassy Lake 7265 31.5 31.6 100 34.4 35.2 98 Gros Ventre Summit 8750 16.4 13.0 126 15.4 12.6 122 Gunsight Pass 9820 17.4 13.6 128 16.6 13.4 124 Lewis Lake Divide 7850 39.1 29.6 132 38.1 34.6 110 Phillips Bench 8200 28.6 24.7 116 28.2 27.5 103 Salt River Summit 7640 11.1 13.0 85 12.8 16.3 79 Snake River Station 6920 19.4 15.1 128 23.1 21.9 105 Spring Creek Divide 9000 26.4 22.5 117 24.6 23.3 106 Thumb Divide 7980 19.9 14.7 135 19.1 18.1 106 Togwotee Pass 9580 31.9 21.8 146 32.3 23.7 136 Two Ocean Plateau 9240 37.3 25.7 145 29.1 26.5 110 Willow Creek 8080 33.9 28.2 120 35.0 32.8 107 Younts Peak 8350 -M 14.2 * -M 15.4 * ----- ----- Basin Index (%) 123 107 MADISON-GALLATIN Black Bear 8170 42.9 37.0 116 40.7 37.3 109 Canyon 7870 17.1 12.4 138 19.3 15.8 122 Madison Plateau 7750 26.5 21.4 124 26.9 25.6 105 West Yellowstone 6700 13.7 10.0 137 17.0 13.8 123 Whiskey Creek 6800 16.3 15.0 109 19.1 19.6 97 ----- ----- Basin Index (%) 122 110 YELLOWSTONE Beartooth Lake 9360 38.9 21.2 183 35.4 19.2 184 Burnt Mtn 5880 7.8 4.6 170 14.7 12.6 117 Canyon 7870 17.1 12.4 138 19.3 15.8 122 Cole Creek 7850 15.0 14.1 106 12.0 12.4 97 Evening Star 9200 40.9 23.8 172 42.0 26.5 158 Fisher Creek 9100 52.1 30.8 169 45.6 30.8 148 Northeast Entrance 7350 14.2 9.2 154 18.0 11.9 151 Parker Peak 9400 33.8 19.1 177 29.2 17.1 171 Sylvan Lake 8420 25.5 19.3 132 27.0 21.7 124 Thumb Divide 7980 19.9 14.7 135 19.1 18.1 106 Two Ocean Plateau 9240 37.3 25.7 145 29.1 26.5 110 White Mill 8700 40.6 21.9 185 31.4 23.1 136 Wolverine 7650 22.2 9.4 236 20.9 11.9 176 ----- ----- Basin Index (%) 161 139 WIND RIVER Burroughs Creek 8750 15.9 -M * 17.5 -M * Castle Creek 8400 8.3 -M * 9.6 -M * Cold Springs 9630 10.1 7.0 144 10.0 9.7 103 Deer Park 9700 12.6 15.1 83 15.4 19.3 80 Hobbs Park 10100 17.6 13.8 128 15.2 13.0 117 Kirwin 9550 20.0 9.5 211 17.9 11.2 160 Little Warm 9370 16.3 10.2 160 17.0 12.5 136 Owl Creek 8975 4.6 5.7 81 6.0 5.9 102 South Pass 9040 12.0 15.1 79 8.5 17.0 50 St. Lawrence Alt 8620 2.8 6.8 41 8.5 8.7 98 Togwotee Pass 9580 31.9 21.8 146 32.3 23.7 136 Townsend Creek 8700 7.2 9.3 77 9.3 11.7 79 ----- ----- Basin Index (%) 118 106 BIGHORN BASIN Bald Mtn. 9380 21.3 18.9 113 15.4 16.5 93 Bear Trap Meadow 8200 -M 5.1 * 11.2 8.2 137 Bone Springs Div 9350 19.5 16.4 119 14.7 15.1 97 Grave Springs 8550 7.8 9.1 86 5.7 10.2 56 Kirwin 9550 20.0 9.5 211 17.9 11.2 160 Marquette 8760 6.5 -M * 10.1 -M * Middle Powder 7760 10.2 11.7 87 6.6 11.3 58 Owl Creek 8975 4.6 5.7 81 6.0 5.9 102 Powder River Pass 9480 16.5 10.1 163 15.5 12.2 127 Shell Creek 9580 21.2 14.8 143 16.1 13.4 120 Timber Creek 7950 3.7 4.9 76 -M 7.2 * ----- ----- Basin Index (%) 123 105 SHOSHONE RIVER Blackwater 9780 34.2 22.3 153 31.8 20.0 159 Evening Star 9200 40.9 23.8 172 42.0 26.5 158 Marquette 8760 6.5 -M * 10.1 -M * Sylvan Road 7120 14.5 11.0 132 21.6 16.3 133 Younts Peak 8350 -M 14.2 * -M 15.4 * ----- ----- Basin Index (%) 157 152 POWDER RIVER Bear Trap Meadow 8200 -M 5.1 * 11.2 8.2 137 Cloud Peak Reservoir 9860 16.5 14.4 115 14.9 12.9 116 Grave Springs 8550 7.8 9.1 86 5.7 10.2 56 Hansen Sawmill 8360 9.4 6.2 152 10.8 8.3 130 Middle Powder 7760 10.2 11.7 87 6.6 11.3 58 Powder River Pass 9480 16.5 10.1 163 15.5 12.2 127 Soldier Park 8720 8.2 -M * 10.5 -M * ----- ----- Basin Index (%) 117 103 TONGUE RIVER Big Goose 7990 8.9 9.3 96 9.3 11.1 84 Bone Springs Div 9350 19.5 16.4 119 14.7 15.1 97 Burgess Junction 7880 10.6 11.6 91 9.1 12.0 76 Dome Lake 8880 15.5 11.6 134 12.5 13.2 95 Little Goose 8870 10.7 -M * 12.7 -M * Sucker Creek 8880 11.6 11.8 98 9.3 14.0 66 Tie Creek 6870 5.8 5.5 105 9.7 11.3 86 ----- ----- Basin Index (%) 109 84 BELLE FOURCHE Cole Canyon 5910 -M 5.6 * 10.4 9.1 114 ----- ----- Basin Index (%) * 114 CHEYENNE RIVER BASIN Blind Park 6890 8.2 7.1 115 11.4 11.5 99 North Rapid Creek 6130 7.6 6.7 113 8.9 9.5 94 ----- ----- Basin Index (%) 114 97 UPPER N. PLATTE Arapaho Ridge 10960 19.5 20.4 96 19.1 21.8 88 Blackhall Mtn 9820 27.8 -M * 26.7 -M * Columbine 9160 21.5 23.3 92 23.0 25.0 92 Divide Peak 8880 14.0 19.7 71 17.7 21.0 84 Joe Wright 10120 19.1 20.6 93 28.8 25.2 114 Laprele Creek 8375 6.5 9.4 69 8.0 12.2 66 Med Bow 10500 40.4 -M * 30.8 -M * North French Creek 10130 28.1 28.7 98 27.2 26.1 104 Never Summer 10280 18.6 20.0 93 15.3 -M * Old Battle 10000 25.0 30.7 81 23.5 34.2 69 Rawah 9020 11.3 10.4 109 14.9 13.8 108 Sage Creek Basin 7850 8.2 12.5 66 10.5 14.2 74 Sand Lake 10050 26.7 28.3 94 22.8 24.2 94 South Brush Creek 8440 11.2 12.1 93 12.1 14.9 81 Tower 10500 35.0 45.1 78 -M 38.9 * Webber Springs 9250 18.8 23.0 82 21.3 26.1 82 Willow Creek Pass 9540 12.9 12.0 108 13.8 13.1 105 Zirkel 9340 27.0 26.3 103 30.9 27.8 111 ----- ----- Basin Index (%) 89 91 SWEETWATER Deer Park 9700 12.6 15.1 83 15.4 19.3 80 Larsen Creek 9000 11.2 11.9 94 11.3 -M * South Pass 9040 12.0 15.1 79 8.5 17.0 50 ----- ----- Basin Index (%) 85 66 LOWER N. PLATTE Casper Mtn. 7900 8.1 14.0 58 6.8 14.4 47 Laprele Creek 8375 6.5 9.4 69 8.0 12.2 66 Reno Hill 8400 10.1 13.7 74 11.4 14.9 77 Windy Peak 7900 6.3 7.8 81 8.1 10.2 79 ----- ----- Basin Index (%) 69 66 LARAMIE RIVER Brooklyn Lake 10240 25.2 21.0 120 25.0 20.6 121 Cinnabar Park 9574 21.1 20.6 102 24.7 23.6 105 Crow Creek 8330 4.2 7.0 60 10.8 10.5 103 Deadman Hill 10220 20.6 15.9 130 19.5 16.9 115 Rawah 9020 11.3 10.4 109 14.9 13.8 108 Roach 9700 13.7 16.1 85 17.0 18.8 90 ----- ----- Basin Index (%) 106 107 S. PLATTE Black Mountain 8920 10.6 -M * 13.4 -M * Crow Creek 8330 4.2 7.0 60 10.8 10.5 103 Deadman Hill 10220 20.6 15.9 130 19.5 16.9 115 ----- ----- Basin Index (%) 108 111 LITTLE SNAKE RIVER Battle Mountain 7440 5.8 10.2 57 9.3 14.7 63 Divide Peak 8880 14.0 19.7 71 17.7 21.0 84 Elk River 8700 15.3 19.1 80 16.3 19.6 83 Little Snake River 8915 21.5 24.2 89 27.2 29.1 93 Old Battle 10000 25.0 30.7 81 23.5 34.2 69 Sage Creek Basin 7850 8.2 12.5 66 10.5 14.2 74 Sandstone RS 8150 8.6 12.9 67 9.0 18.0 50 Whiskey Park 8950 24.4 26.8 91 25.1 27.3 92 ----- ----- Basin Index (%) 79 78 UPPER GREEN RIVER Big Sandy Opening 9080 13.2 12.4 106 13.0 12.9 101 Blind Bull Sum 8650 33.3 23.0 145 19.6 19.1 103 East Rim Divide 7930 12.5 10.2 123 12.4 11.5 108 Elkhart Park G.S. 9400 12.3 12.2 101 11.9 13.0 92 Gros Ventre Summit 8750 16.4 13.0 126 15.4 12.6 122 Gunsight Pass 9820 17.4 13.6 128 16.6 13.4 124 Kendall R.S. 7740 15.2 11.5 132 15.7 13.9 113 Loomis Park 8240 18.2 14.0 130 18.6 16.9 110 New Fork Lake 8340 11.6 10.3 113 11.4 10.5 109 Pocket Creek 9360 8.9 -M * 9.0 -M * Snider Basin 8060 12.6 12.3 102 14.8 13.9 106 Spring Creek Divide 9000 26.4 22.5 117 24.6 23.3 106 Triple Peak 8500 30.8 21.9 141 31.3 24.8 126 ----- ----- Basin Index (%) 124 110 LOWER GREEN RIVER Blacks Fork Jct 8869 7.3 -M * 8.8 -M * Buck Pasture 9632 11.9 -M * 13.0 -M * EF Blacks Fork GS 9360 10.8 -M * -M -M * Hams Fork 7840 9.4 10.9 86 9.4 11.1 85 Hewinta 9500 7.4 11.0 67 11.1 13.7 81 Hickerson Park 9122 6.8 7.7 88 7.6 10.0 76 Hole-in-Rock 9168 7.1 6.9 103 8.1 9.4 86 Indian Creek 9425 21.6 24.3 89 15.7 22.1 71 Kelley R.S. 8180 13.4 15.0 89 14.6 17.7 82 Spirit Lk 10235 10.7 -M * 11.7 -M * Steel Creek Park 10158 13.1 15.6 84 13.6 16.1 84 ----- ----- Basin Index (%) 86 80 UPPER BEAR RIVER Bear River RS 8777 6.3 -M * 10.4 -M * Bug Lake 7987 14.6 18.2 80 15.8 19.0 83 Burts Miller Ranch 8000 4.2 -M * 6.2 -M * Chalk Creek #1 9171 14.9 23.9 62 16.1 24.7 65 Hayden Fork 9130 11.7 15.3 76 15.9 20.6 77 Kelley R.S. 8180 13.4 15.0 89 14.6 17.7 82 Lily Lake 9133 9.3 12.4 75 11.2 16.7 67 Monte Cristo 8932 21.6 27.2 79 21.4 25.4 84 Salt River Summit 7640 11.1 13.0 85 12.8 16.3 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.