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 25 , 2018 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 15.9 10.8 147 24.9 22.1 113 Black Bear 8170 46.7 36.9 127 45.4 40.7 112 Blind Bull Sum 8650 37.5 24.3 154 22.0 20.7 106 Cottonwood Creek 7670 21.5 17.3 124 30.1 26.5 114 East Rim Divide 7930 7.8 9.0 87 13.5 12.4 109 Grand Targhee 9260 54.7 43.1 127 37.8 33.5 113 Granite Creek 6770 14.2 9.5 149 24.1 20.6 117 Grassy Lake 7265 32.1 30.2 106 39.9 38.2 104 Gros Ventre Summit 8750 16.0 12.5 128 17.0 14.0 121 Gunsight Pass 9820 18.6 13.5 138 18.8 15.4 122 Lewis Lake Divide 7850 44.9 30.7 146 -M 37.5 * Phillips Bench 8200 32.7 25.4 129 32.3 29.8 108 Salt River Summit 7640 6.7 8.5 79 14.4 17.8 81 Snake River Station 6920 15.0 10.1 149 26.3 24.0 110 Spring Creek Divide 9000 29.1 23.7 123 27.3 25.4 107 Thumb Divide 7980 18.4 14.2 130 21.5 20.2 106 Togwotee Pass 9580 36.0 24.4 148 37.4 26.3 142 Two Ocean Plateau 9240 43.6 29.0 150 34.0 29.2 116 Willow Creek 8080 36.4 25.7 142 40.9 36.3 113 Younts Peak 8350 -M 15.1 * -M 17.0 * ----- ----- Basin Index (%) 132 112 MADISON-GALLATIN Black Bear 8170 46.7 36.9 127 45.4 40.7 112 Canyon 7870 18.3 11.7 156 21.6 17.4 124 Madison Plateau 7750 30.3 22.6 134 30.5 28.0 109 West Yellowstone 6700 8.8 5.1 173 19.3 15.4 125 Whiskey Creek 6800 16.3 15.5 105 22.3 21.7 103 ----- ----- Basin Index (%) 131 113 YELLOWSTONE Beartooth Lake 9360 42.3 23.6 179 39.0 21.2 184 Burnt Mtn 5880 5.9 .0 * 17.2 14.9 115 Canyon 7870 18.3 11.7 156 21.6 17.4 124 Cole Creek 7850 17.1 16.3 105 14.4 15.2 95 Evening Star 9200 45.2 24.5 184 -M 29.4 * Fisher Creek 9100 57.1 33.2 172 51.8 34.1 152 Northeast Entrance 7350 13.0 5.1 255 20.2 13.3 152 Parker Peak 9400 39.2 21.8 180 33.3 19.3 173 Sylvan Lake 8420 27.1 20.3 133 31.4 24.2 130 Thumb Divide 7980 18.4 14.2 130 21.5 20.2 106 Two Ocean Plateau 9240 43.6 29.0 150 34.0 29.2 116 White Mill 8700 45.6 23.8 192 35.6 25.4 140 Wolverine 7650 21.7 5.6 388 23.4 13.2 177 ----- ----- Basin Index (%) 172 139 WIND RIVER Burroughs Creek 8750 15.5 -M * 19.7 -M * Castle Creek 8400 4.9 -M * 10.8 -M * Cold Springs 9630 7.1 3.1 229 10.8 11.6 93 Deer Park 9700 12.0 16.3 74 16.5 22.7 73 Hobbs Park 10100 18.7 15.6 120 16.4 15.7 104 Kirwin 9550 19.3 10.1 191 20.1 13.0 155 Little Warm 9370 16.8 9.5 177 19.2 14.5 132 Owl Creek 8975 1.9 2.7 70 7.4 7.3 101 South Pass 9040 11.1 15.2 73 -M 19.4 * St. Lawrence Alt 8620 -M 4.9 * 9.0 10.6 85 Togwotee Pass 9580 36.0 24.4 148 37.4 26.3 142 Townsend Creek 8700 5.4 8.8 61 9.9 14.1 70 ----- ----- Basin Index (%) 121 108 BIGHORN BASIN Bald Mtn. 9380 24.5 20.4 120 18.9 18.7 101 Bear Trap Meadow 8200 8.7 2.0 435 11.9 9.9 120 Bone Springs Div 9350 22.6 16.4 138 17.4 17.3 101 Grave Springs 8550 8.0 9.2 87 -M 12.2 * Kirwin 9550 19.3 10.1 191 20.1 13.0 155 Marquette 8760 6.9 -M * 11.6 -M * Middle Powder 7760 11.0 12.3 89 -M 13.3 * Owl Creek 8975 1.9 2.7 70 7.4 7.3 101 Powder River Pass 9480 16.5 10.2 162 17.4 14.2 123 Shell Creek 9580 23.6 15.8 149 18.3 15.3 120 Timber Creek 7950 .0 3.7 0 -M 9.0 * ----- ----- Basin Index (%) 132 116 SHOSHONE RIVER Blackwater 9780 37.7 24.4 155 35.6 22.5 158 Evening Star 9200 45.2 24.5 184 -M 29.4 * Marquette 8760 6.9 -M * 11.6 -M * Sylvan Road 7120 12.3 8.3 148 25.0 17.9 140 Younts Peak 8350 -M 15.1 * -M 17.0 * ----- ----- Basin Index (%) 166 150* POWDER RIVER Bear Trap Meadow 8200 8.7 2.0 435 11.9 9.9 120 Cloud Peak Reservoir 9860 17.8 16.3 109 16.5 15.6 106 Grave Springs 8550 8.0 9.2 87 -M 12.2 * Hansen Sawmill 8360 8.8 4.3 205 11.9 10.1 118 Middle Powder 7760 11.0 12.3 89 -M 13.3 * Powder River Pass 9480 16.5 10.2 162 17.4 14.2 123 Soldier Park 8720 6.9 -M * 11.6 -M * ----- ----- Basin Index (%) 130 116 TONGUE RIVER Big Goose 7990 9.6 9.1 105 10.9 13.4 81 Bone Springs Div 9350 22.6 16.4 138 17.4 17.3 101 Burgess Junction 7880 11.9 12.4 96 10.6 13.9 76 Dome Lake 8880 16.6 11.8 141 14.8 15.4 96 Little Goose 8870 11.3 -M * 14.8 -M * Sucker Creek 8880 12.8 12.7 101 11.8 16.4 72 Tie Creek 6870 4.3 3.5 123 11.3 13.6 83 ----- ----- Basin Index (%) 118 85 BELLE FOURCHE Cole Canyon 5910 5.8 .8 725 12.4 10.9 114 ----- ----- Basin Index (%) 725 114 CHEYENNE RIVER BASIN Blind Park 6890 5.5 3.6 153 13.4 13.6 99 North Rapid Creek 6130 4.2 3.5 120 10.7 11.6 92 ----- ----- Basin Index (%) 137 96 UPPER N. PLATTE Arapaho Ridge 10960 23.7 21.8 109 23.8 25.4 94 Blackhall Mtn 9820 29.0 -M * 29.9 -M * Columbine 9160 23.0 20.6 112 28.5 27.7 103 Divide Peak 8880 12.4 18.1 69 20.1 23.5 86 Joe Wright 10120 23.3 23.2 100 33.8 28.8 117 Laprele Creek 8375 4.3 7.3 59 9.5 14.3 66 Med Bow 10500 45.1 -M * 37.8 -M * North French Creek 10130 30.8 32.6 94 31.1 29.5 105 Never Summer 10280 22.7 21.1 108 18.8 -M * Old Battle 10000 28.0 34.1 82 26.5 37.9 70 Rawah 9020 9.4 8.0 118 17.0 16.6 102 Sage Creek Basin 7850 -M 2.7 * 11.4 15.6 73 Sand Lake 10050 30.1 31.0 97 26.1 27.9 94 South Brush Creek 8440 6.1 10.0 61 13.4 17.0 79 Tower 10500 45.0 49.3 91 -M 43.3 * Webber Springs 9250 17.4 21.9 79 23.7 29.0 82 Willow Creek Pass 9540 15.0 13.7 109 16.3 15.1 108 Zirkel 9340 23.5 22.3 105 34.4 30.3 114 ----- ----- Basin Index (%) 94 93 SWEETWATER Deer Park 9700 12.0 16.3 74 16.5 22.7 73 Larsen Creek 9000 7.6 9.8 78 12.0 -M * South Pass 9040 11.1 15.2 73 -M 19.4 * ----- ----- Basin Index (%) 74 73* LOWER N. PLATTE Casper Mtn. 7900 8.0 14.2 56 8.0 17.1 47 Laprele Creek 8375 4.3 7.3 59 9.5 14.3 66 Reno Hill 8400 10.7 13.8 78 13.4 17.9 75 Windy Peak 7900 4.8 6.1 79 9.7 12.3 79 ----- ----- Basin Index (%) 67 66 LARAMIE RIVER Brooklyn Lake 10240 26.8 22.8 118 28.3 23.7 119 Cinnabar Park 9574 21.8 20.0 109 27.2 26.1 104 Crow Creek 8330 .5 .0 * 12.4 12.8 97 Deadman Hill 10220 22.9 18.1 127 22.0 19.8 111 Rawah 9020 9.4 8.0 118 17.0 16.6 102 Roach 9700 14.2 16.8 85 19.2 21.4 90 ----- ----- Basin Index (%) 112 105 S. PLATTE Black Mountain 8920 9.6 -M * 14.8 -M * Crow Creek 8330 .5 .0 * 12.4 12.8 97 Deadman Hill 10220 22.9 18.1 127 22.0 19.8 111 ----- ----- Basin Index (%) 129* 106 LITTLE SNAKE RIVER Battle Mountain 7440 .0 1.9 0 11.8 16.5 72 Divide Peak 8880 12.4 18.1 69 20.1 23.5 86 Elk River 8700 11.4 14.6 78 18.6 21.9 85 Little Snake River 8915 19.7 23.3 85 30.5 31.7 96 Old Battle 10000 28.0 34.1 82 26.5 37.9 70 Sage Creek Basin 7850 -M 2.7 * 11.4 15.6 73 Sandstone RS 8150 3.6 8.6 42 10.9 20.1 54 Whiskey Park 8950 23.8 25.6 93 28.6 30.4 94 ----- ----- Basin Index (%) 78 80 UPPER GREEN RIVER Big Sandy Opening 9080 12.2 12.1 101 14.0 14.6 96 Blind Bull Sum 8650 37.5 24.3 154 22.0 20.7 106 East Rim Divide 7930 7.8 9.0 87 13.5 12.4 109 Elkhart Park G.S. 9400 12.6 11.8 107 13.1 14.4 91 Gros Ventre Summit 8750 16.0 12.5 128 17.0 14.0 121 Gunsight Pass 9820 18.6 13.5 138 18.8 15.4 122 Kendall R.S. 7740 9.9 6.6 150 16.9 15.0 113 Loomis Park 8240 15.4 11.9 129 20.3 18.3 111 New Fork Lake 8340 7.7 7.4 104 12.5 11.6 108 Pocket Creek 9360 9.5 -M * 10.0 -M * Snider Basin 8060 5.9 10.1 58 15.9 15.1 105 Spring Creek Divide 9000 29.1 23.7 123 27.3 25.4 107 Triple Peak 8500 33.6 19.0 177 35.1 27.0 130 ----- ----- Basin Index (%) 127 111 LOWER GREEN RIVER Blacks Fork Jct 8869 2.8 -M * 10.5 -M * Buck Pasture 9632 10.8 -M * 15.5 -M * EF Blacks Fork GS 9360 7.6 -M * -M -M * Hams Fork 7840 3.8 5.0 76 11.6 12.5 93 Hewinta 9500 4.5 6.9 65 12.8 15.5 83 Hickerson Park 9122 .7 5.0 14 9.0 11.5 78 Hole-in-Rock 9168 3.1 5.0 62 9.5 11.0 86 Indian Creek 9425 23.5 23.7 99 18.1 24.2 75 Kelley R.S. 8180 11.4 11.9 96 16.2 19.5 83 Spirit Lk 10235 9.7 -M * 13.5 -M * Steel Creek Park 10158 15.4 16.5 93 16.2 18.4 88 ----- ----- Basin Index (%) 84 83 UPPER BEAR RIVER Bear River RS 8777 .0 -M * 11.6 -M * Bug Lake 7987 12.3 16.2 76 18.0 20.9 86 Burts Miller Ranch 8000 .4 -M * 6.7 -M * Chalk Creek #1 9171 12.9 24.6 52 18.0 27.5 65 Hayden Fork 9130 3.7 10.7 35 18.0 22.9 79 Kelley R.S. 8180 11.4 11.9 96 16.2 19.5 83 Lily Lake 9133 7.1 9.9 72 12.5 18.8 66 Monte Cristo 8932 22.3 27.4 81 24.5 28.2 87 Salt River Summit 7640 6.7 8.5 79 14.4 17.8 81 ----- ----- Basin Index (%) 70 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.