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 29 , 2018 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 12.9 10.0 129 24.9 22.6 110 Black Bear 8170 47.0 37.3 126 45.5 41.4 110 Blind Bull Sum 8650 39.5 23.7 167 22.1 21.1 105 Cottonwood Creek 7670 17.7 16.0 111 30.2 27.1 111 East Rim Divide 7930 3.8 8.4 45 13.6 12.7 107 Grand Targhee 9260 -M 44.1 * -M 34.1 * Granite Creek 6770 11.4 8.6 133 24.1 21.1 114 Grassy Lake 7265 28.9 29.7 97 40.1 38.9 103 Gros Ventre Summit 8750 14.9 11.8 126 17.1 14.4 119 Gunsight Pass 9820 17.1 13.0 132 18.9 15.9 119 Lewis Lake Divide 7850 42.9 30.4 141 44.2 38.2 116 Phillips Bench 8200 -M 25.6 * -M 30.3 * Salt River Summit 7640 2.8 8.1 35 14.3 18.2 79 Snake River Station 6920 10.1 8.4 120 26.4 24.5 108 Spring Creek Divide 9000 27.7 24.3 114 27.3 25.9 105 Thumb Divide 7980 -M 13.3 * -M 20.7 * Togwotee Pass 9580 34.7 24.7 140 37.4 27.0 139 Two Ocean Plateau 9240 43.6 29.6 147 34.2 29.8 115 Willow Creek 8080 -M 24.1 * -M 37.1 * Younts Peak 8350 -M 15.3 * -M 17.4 * ----- ----- Basin Index (%) 125 111 MADISON-GALLATIN Black Bear 8170 47.0 37.3 126 45.5 41.4 110 Canyon 7870 16.4 11.0 149 21.6 17.8 121 Madison Plateau 7750 28.6 21.9 131 30.5 28.7 106 West Yellowstone 6700 4.5 3.1 145 19.4 15.8 123 Whiskey Creek 6800 15.2 15.1 101 22.5 22.1 102 ----- ----- Basin Index (%) 126 111 YELLOWSTONE Beartooth Lake 9360 -M 23.1 * 39.0 21.7 180 Burnt Mtn 5880 3.2 .0 * 17.6 15.4 114 Canyon 7870 16.4 11.0 149 21.6 17.8 121 Cole Creek 7850 15.8 16.4 96 14.4 16.0 90 Evening Star 9200 44.1 24.8 178 -M 30.1 * Fisher Creek 9100 58.8 33.0 178 51.9 34.8 149 Northeast Entrance 7350 9.4 4.0 235 20.3 13.6 149 Parker Peak 9400 39.1 21.5 182 33.4 19.8 169 Sylvan Lake 8420 25.0 20.2 124 31.4 24.7 127 Thumb Divide 7980 -M 13.3 * -M 20.7 * Two Ocean Plateau 9240 43.6 29.6 147 34.2 29.8 115 White Mill 8700 44.3 23.8 186 35.8 26.0 138 Wolverine 7650 18.7 3.6 519 23.7 13.6 174 ----- ----- Basin Index (%) 169 139 WIND RIVER Burroughs Creek 8750 12.7 -M * 20.0 -M * Castle Creek 8400 1.3 -M * 11.0 -M * Cold Springs 9630 4.4 1.7 259 11.1 12.1 92 Deer Park 9700 10.3 16.2 64 16.8 23.1 73 Hobbs Park 10100 16.3 15.9 103 16.7 16.4 102 Kirwin 9550 19.4 10.3 188 20.2 13.5 150 Little Warm 9370 15.1 9.0 168 19.3 15.1 128 Owl Creek 8975 .0 1.4 0 7.6 7.7 99 South Pass 9040 9.1 15.1 60 -M 20.1 * St. Lawrence Alt 8620 .0 3.4 0 9.1 11.3 81 Togwotee Pass 9580 34.7 24.7 140 37.4 27.0 139 Townsend Creek 8700 2.7 8.0 34 10.9 14.7 74 ----- ----- Basin Index (%) 106 106 BIGHORN BASIN Bald Mtn. 9380 20.4 20.5 100 18.9 19.4 97 Bear Trap Meadow 8200 6.2 1.3 477 12.0 10.3 117 Bone Springs Div 9350 22.1 16.5 134 17.8 17.9 99 Grave Springs 8550 6.9 9.3 74 -M 12.5 * Kirwin 9550 19.4 10.3 188 20.2 13.5 150 Marquette 8760 5.7 -M * 11.7 -M * Middle Powder 7760 9.6 11.9 81 -M 13.9 * Owl Creek 8975 .0 1.4 0 7.6 7.7 99 Powder River Pass 9480 15.1 9.7 156 17.6 14.8 119 Shell Creek 9580 22.3 16.0 139 18.3 16.0 114 Timber Creek 7950 .0 3.4 0 -M 9.7 * ----- ----- Basin Index (%) 122 113 SHOSHONE RIVER Blackwater 9780 37.2 25.0 149 35.7 23.1 155 Evening Star 9200 44.1 24.8 178 -M 30.1 * Marquette 8760 5.7 -M * 11.7 -M * Sylvan Road 7120 7.0 6.7 104 24.8 18.4 135 Younts Peak 8350 -M 15.3 * -M 17.4 * ----- ----- Basin Index (%) 156 146* POWDER RIVER Bear Trap Meadow 8200 6.2 1.3 477 12.0 10.3 117 Cloud Peak Reservoir 9860 16.1 16.5 98 17.0 16.2 105 Grave Springs 8550 6.9 9.3 74 -M 12.5 * Hansen Sawmill 8360 6.3 3.3 191 12.2 10.6 115 Middle Powder 7760 9.6 11.9 81 -M 13.9 * Powder River Pass 9480 15.1 9.7 156 17.6 14.8 119 Soldier Park 8720 4.6 -M * 11.9 -M * ----- ----- Basin Index (%) 116 113 TONGUE RIVER Big Goose 7990 8.1 9.2 88 11.1 13.7 81 Bone Springs Div 9350 22.1 16.5 134 17.8 17.9 99 Burgess Junction 7880 11.2 12.1 93 10.9 14.5 75 Dome Lake 8880 12.9 11.6 111 15.0 16.1 93 Little Goose 8870 9.3 -M * 15.0 -M * Sucker Creek 8880 10.3 12.4 83 12.1 17.0 71 Tie Creek 6870 1.6 2.8 57 11.3 13.9 81 ----- ----- Basin Index (%) 102 84 BELLE FOURCHE Cole Canyon 5910 3.0 .3 1000* 12.7 11.5 110 ----- ----- Basin Index (%) 1000* 110 CHEYENNE RIVER BASIN Blind Park 6890 2.5 1.8 139 13.6 14.0 97 North Rapid Creek 6130 1.2 1.8 67 10.9 11.9 92 ----- ----- Basin Index (%) 103 95 UPPER N. PLATTE Arapaho Ridge 10960 22.2 22.3 100 23.9 25.9 92 Blackhall Mtn 9820 26.7 -M * 30.0 -M * Columbine 9160 19.1 19.1 100 29.0 28.2 103 Divide Peak 8880 8.7 18.0 48 20.2 24.0 84 Joe Wright 10120 22.1 23.5 94 33.9 29.5 115 Laprele Creek 8375 1.0 6.7 15 9.9 14.8 67 Med Bow 10500 44.5 -M * 37.9 -M * North French Creek 10130 29.3 33.0 89 31.2 30.4 103 Never Summer 10280 21.8 21.6 101 18.9 -M * Old Battle 10000 27.0 34.6 78 26.8 38.8 69 Rawah 9020 6.5 7.0 93 17.2 17.0 101 Sage Creek Basin 7850 -M 1.2 * 11.4 16.0 71 Sand Lake 10050 29.2 31.3 93 26.2 28.7 91 South Brush Creek 8440 2.5 9.8 26 13.6 17.6 77 Tower 10500 44.7 49.8 90 39.9 44.3 90 Webber Springs 9250 14.9 22.0 68 23.7 29.7 80 Willow Creek Pass 9540 13.9 13.9 100 16.3 15.5 105 Zirkel 9340 19.2 21.4 90 34.6 30.7 113 ----- ----- Basin Index (%) 84 91 SWEETWATER Deer Park 9700 10.3 16.2 64 16.8 23.1 73 Larsen Creek 9000 3.8 9.4 40 12.2 -M * South Pass 9040 9.1 15.1 60 -M 20.1 * ----- ----- Basin Index (%) 57 73* LOWER N. PLATTE Casper Mtn. 7900 5.9 14.0 42 8.2 17.7 46 Laprele Creek 8375 1.0 6.7 15 9.9 14.8 67 Reno Hill 8400 9.3 13.1 71 13.8 18.6 74 Windy Peak 7900 2.4 4.7 51 10.3 12.8 80 ----- ----- Basin Index (%) 48 66 LARAMIE RIVER Brooklyn Lake 10240 24.3 23.2 105 28.4 24.4 116 Cinnabar Park 9574 19.4 19.9 97 27.2 26.8 101 Crow Creek 8330 .0 .0 * 12.5 13.3 94 Deadman Hill 10220 21.2 18.8 113 22.2 20.4 109 Rawah 9020 6.5 7.0 93 17.2 17.0 101 Roach 9700 12.3 17.3 71 19.2 22.0 87 ----- ----- Basin Index (%) 97 102 S. PLATTE Black Mountain 8920 7.5 -M * 14.9 -M * Crow Creek 8330 .0 .0 * 12.5 13.3 94 Deadman Hill 10220 21.2 18.8 113 22.2 20.4 109 ----- ----- Basin Index (%) 113* 103 LITTLE SNAKE RIVER Battle Mountain 7440 .0 .0 * 12.8 17.0 75 Divide Peak 8880 8.7 18.0 48 20.2 24.0 84 Elk River 8700 6.8 13.8 49 18.6 22.4 83 Little Snake River 8915 15.9 22.7 70 30.6 32.4 94 Old Battle 10000 27.0 34.6 78 26.8 38.8 69 Sage Creek Basin 7850 -M 1.2 * 11.4 16.0 71 Sandstone RS 8150 .0 6.7 0 11.1 20.6 54 Whiskey Park 8950 20.8 26.1 80 28.6 31.1 92 ----- ----- Basin Index (%) 65 79 UPPER GREEN RIVER Big Sandy Opening 9080 10.4 11.3 92 14.2 15.0 95 Blind Bull Sum 8650 39.5 23.7 167 22.1 21.1 105 East Rim Divide 7930 3.8 8.4 45 13.6 12.7 107 Elkhart Park G.S. 9400 10.5 11.6 91 13.2 14.8 89 Gros Ventre Summit 8750 14.9 11.8 126 17.1 14.4 119 Gunsight Pass 9820 17.1 13.0 132 18.9 15.9 119 Kendall R.S. 7740 6.8 5.2 131 16.9 15.4 110 Loomis Park 8240 12.8 11.3 113 20.4 18.7 109 New Fork Lake 8340 4.6 6.8 68 12.7 11.9 107 Pocket Creek 9360 8.6 -M * 10.1 -M * Snider Basin 8060 2.9 9.7 30 16.0 15.4 104 Spring Creek Divide 9000 27.7 24.3 114 27.3 25.9 105 Triple Peak 8500 29.3 18.2 161 35.2 27.6 128 ----- ----- Basin Index (%) 116 109 LOWER GREEN RIVER Blacks Fork Jct 8869 .2 -M * 10.5 -M * Buck Pasture 9632 7.5 -M * 15.4 -M * EF Blacks Fork GS 9360 3.0 -M * -M -M * Hams Fork 7840 .0 3.7 0 11.6 12.9 90 Hewinta 9500 .0 5.3 0 12.9 15.9 81 Hickerson Park 9122 .3 4.7 6 9.1 11.8 77 Hole-in-Rock 9168 .5 3.3 15 9.8 11.3 87 Indian Creek 9425 20.3 23.5 86 18.2 24.7 74 Kelley R.S. 8180 8.2 11.8 69 16.2 19.9 81 Spirit Lk 10235 6.6 -M * 13.5 -M * Steel Creek Park 10158 13.6 16.9 80 16.2 18.8 86 ----- ----- Basin Index (%) 62 82 UPPER BEAR RIVER Bear River RS 8777 .0 -M * 11.6 -M * Bug Lake 7987 8.9 15.7 57 18.0 21.4 84 Burts Miller Ranch 8000 .4 -M * 6.7 -M * Chalk Creek #1 9171 9.1 24.6 37 18.0 28.1 64 Hayden Fork 9130 .4 9.7 4 18.0 23.5 77 Kelley R.S. 8180 8.2 11.8 69 16.2 19.9 81 Lily Lake 9133 3.3 9.8 34 12.5 19.3 65 Monte Cristo 8932 18.5 27.1 68 24.6 28.9 85 Salt River Summit 7640 2.8 8.1 35 14.3 18.2 79 ----- ----- Basin Index (%) 48 76 ----------------------------------------------------------------------------- -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.