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 MONDAY: APRIL 9 , 2018 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 19.0 15.1 126 23.0 20.8 111 Black Bear 8170 41.2 36.9 112 42.9 38.0 113 Blind Bull Sum 8650 36.0 23.4 154 21.4 19.4 110 Cottonwood Creek 7670 23.9 20.9 114 27.6 24.5 113 East Rim Divide 7930 13.0 10.2 127 13.1 11.7 112 Grand Targhee 9260 49.6 39.0 127 30.5 30.8 99 Granite Creek 6770 18.7 14.1 133 23.2 19.6 118 Grassy Lake 7265 33.7 31.4 107 37.3 35.8 104 Gros Ventre Summit 8750 17.4 12.8 136 16.3 12.9 126 Gunsight Pass 9820 18.7 13.9 135 17.8 13.9 128 Lewis Lake Divide 7850 42.7 30.1 142 40.8 35.2 116 Phillips Bench 8200 31.0 25.6 121 30.0 28.0 107 Salt River Summit 7640 11.1 12.6 88 13.8 16.6 83 Snake River Station 6920 19.0 14.6 130 24.9 22.4 111 Spring Creek Divide 9000 28.2 22.6 125 26.1 23.7 110 Thumb Divide 7980 20.7 14.7 141 20.3 18.5 110 Togwotee Pass 9580 34.5 22.3 155 32.8 24.2 136 Two Ocean Plateau 9240 40.0 26.3 152 30.4 27.1 112 Willow Creek 8080 36.8 28.3 130 36.5 33.5 109 Younts Peak 8350 -M 14.5 * -M 15.7 * ----- ----- Basin Index (%) 129 111 MADISON-GALLATIN Black Bear 8170 41.2 36.9 112 42.9 38.0 113 Canyon 7870 17.7 12.4 143 20.3 16.1 126 Madison Plateau 7750 27.6 21.7 127 28.0 26.2 107 West Yellowstone 6700 -M 9.1 * -M 14.1 * Whiskey Creek 6800 16.4 14.8 111 19.4 20.0 97 ----- ----- Basin Index (%) 120 110 YELLOWSTONE Beartooth Lake 9360 40.5 21.5 188 37.2 19.6 190 Burnt Mtn 5880 8.3 4.0 208 15.3 13.1 117 Canyon 7870 17.7 12.4 143 20.3 16.1 126 Cole Creek 7850 15.3 14.9 103 -M 13.1 * Evening Star 9200 43.6 23.9 182 42.3 27.2 156 Fisher Creek 9100 54.1 31.3 173 48.1 31.4 153 Northeast Entrance 7350 15.2 8.8 173 18.9 12.2 155 Parker Peak 9400 35.9 19.7 182 30.0 17.6 170 Sylvan Lake 8420 27.5 19.5 141 29.3 22.2 132 Thumb Divide 7980 20.7 14.7 141 20.3 18.5 110 Two Ocean Plateau 9240 40.0 26.3 152 30.4 27.1 112 White Mill 8700 43.0 22.5 191 33.3 23.6 141 Wolverine 7650 23.6 9.6 246 22.5 12.2 184 ----- ----- Basin Index (%) 168 144 WIND RIVER Burroughs Creek 8750 17.1 -M * 18.5 -M * Castle Creek 8400 8.7 -M * 10.2 -M * Cold Springs 9630 10.1 6.5 155 10.2 10.0 102 Deer Park 9700 13.2 16.0 82 15.9 20.0 80 Hobbs Park 10100 18.1 14.3 127 15.6 13.6 115 Kirwin 9550 20.6 9.6 215 18.5 11.6 159 Little Warm 9370 17.5 10.3 170 18.1 12.9 140 Owl Creek 8975 4.6 5.8 79 6.4 6.1 105 South Pass 9040 12.4 15.5 80 -M 17.5 * St. Lawrence Alt 8620 2.0 6.9 29 8.6 9.0 96 Togwotee Pass 9580 34.5 22.3 155 32.8 24.2 136 Townsend Creek 8700 7.3 9.8 74 9.6 12.2 79 ----- ----- Basin Index (%) 120 113 BIGHORN BASIN Bald Mtn. 9380 22.9 19.2 119 16.9 17.0 99 Bear Trap Meadow 8200 -M 4.8 * 11.6 8.7 133 Bone Springs Div 9350 20.9 17.0 123 16.0 15.6 103 Grave Springs 8550 8.3 9.5 87 -M 10.7 * Kirwin 9550 20.6 9.6 215 18.5 11.6 159 Marquette 8760 6.9 -M * 10.5 -M * Middle Powder 7760 10.9 12.2 89 -M 11.8 * Owl Creek 8975 4.6 5.8 79 6.4 6.1 105 Powder River Pass 9480 17.2 10.3 167 16.4 12.7 129 Shell Creek 9580 22.2 15.3 145 17.0 13.8 123 Timber Creek 7950 3.7 5.1 73 -M 7.4 * ----- ----- Basin Index (%) 126 120 SHOSHONE RIVER Blackwater 9780 36.8 22.8 161 -M 20.5 * Evening Star 9200 43.6 23.9 182 42.3 27.2 156 Marquette 8760 6.9 -M * 10.5 -M * Sylvan Road 7120 15.8 10.6 149 23.5 16.6 142 Younts Peak 8350 -M 14.5 * -M 15.7 * ----- ----- Basin Index (%) 168 150* POWDER RIVER Bear Trap Meadow 8200 -M 4.8 * 11.6 8.7 133 Cloud Peak Reservoir 9860 17.0 15.0 113 15.5 13.5 115 Grave Springs 8550 8.3 9.5 87 -M 10.7 * Hansen Sawmill 8360 9.9 6.1 162 11.4 8.7 131 Middle Powder 7760 10.9 12.2 89 -M 11.8 * Powder River Pass 9480 17.2 10.3 167 16.4 12.7 129 Soldier Park 8720 8.7 -M * 11.0 -M * ----- ----- Basin Index (%) 119 126 TONGUE RIVER Big Goose 7990 9.5 9.8 97 9.8 11.7 84 Bone Springs Div 9350 20.9 17.0 123 16.0 15.6 103 Burgess Junction 7880 11.3 12.0 94 9.6 12.4 77 Dome Lake 8880 16.4 11.8 139 13.3 13.8 96 Little Goose 8870 11.4 -M * 13.4 -M * Sucker Creek 8880 12.4 12.4 100 10.1 14.5 70 Tie Creek 6870 6.3 5.5 115 10.5 11.9 88 ----- ----- Basin Index (%) 112 87 BELLE FOURCHE Cole Canyon 5910 -M 4.6 * 11.1 9.6 116 ----- ----- Basin Index (%) * 116 CHEYENNE RIVER BASIN Blind Park 6890 9.2 6.8 135 12.5 12.0 104 North Rapid Creek 6130 8.1 6.4 127 9.8 10.0 98 ----- ----- Basin Index (%) 131 101 UPPER N. PLATTE Arapaho Ridge 10960 22.4 21.1 106 21.8 22.8 96 Blackhall Mtn 9820 29.8 -M * 28.3 -M * Columbine 9160 25.1 23.3 108 26.6 25.6 104 Divide Peak 8880 15.1 20.1 75 18.8 21.5 87 Joe Wright 10120 21.4 21.5 100 31.2 25.9 120 Laprele Creek 8375 7.0 9.4 74 8.7 12.6 69 Med Bow 10500 43.4 -M * 30.9 -M * North French Creek 10130 30.5 30.0 102 29.4 26.9 109 Never Summer 10280 21.0 20.4 103 17.1 -M * Old Battle 10000 26.8 31.6 85 25.0 35.2 71 Rawah 9020 11.8 10.6 111 15.6 14.6 107 Sage Creek Basin 7850 7.5 11.4 66 11.0 14.7 75 Sand Lake 10050 29.0 29.3 99 24.6 25.0 98 South Brush Creek 8440 11.3 11.8 96 12.7 15.3 83 Tower 10500 40.7 46.3 88 26.7 40.0 67 Webber Springs 9250 19.4 23.2 84 22.4 26.8 84 Willow Creek Pass 9540 14.0 12.3 114 15.0 13.5 111 Zirkel 9340 28.2 26.1 108 33.0 28.6 115 ----- ----- Basin Index (%) 95 92 SWEETWATER Deer Park 9700 13.2 16.0 82 15.9 20.0 80 Larsen Creek 9000 11.8 11.4 104 12.0 -M * South Pass 9040 12.4 15.5 80 -M 17.5 * ----- ----- Basin Index (%) 87 80* LOWER N. PLATTE Casper Mtn. 7900 8.6 14.4 60 7.1 15.2 47 Laprele Creek 8375 7.0 9.4 74 8.7 12.6 69 Reno Hill 8400 10.7 14.1 76 12.1 15.7 77 Windy Peak 7900 7.0 7.6 92 8.9 10.6 84 ----- ----- Basin Index (%) 73 68 LARAMIE RIVER Brooklyn Lake 10240 26.7 22.1 121 26.6 21.2 125 Cinnabar Park 9574 22.1 21.4 103 26.0 24.3 107 Crow Creek 8330 4.6 6.8 68 11.7 11.0 106 Deadman Hill 10220 21.5 16.3 132 20.4 17.4 117 Rawah 9020 11.8 10.6 111 15.6 14.6 107 Roach 9700 14.2 16.6 86 17.9 19.3 93 ----- ----- Basin Index (%) 108 110 S. PLATTE Black Mountain 8920 10.7 -M * 13.9 -M * Crow Creek 8330 4.6 6.8 68 11.7 11.0 106 Deadman Hill 10220 21.5 16.3 132 20.4 17.4 117 ----- ----- Basin Index (%) 113 113 LITTLE SNAKE RIVER Battle Mountain 7440 5.7 9.0 63 11.2 15.1 74 Divide Peak 8880 15.1 20.1 75 18.8 21.5 87 Elk River 8700 15.8 18.9 84 17.4 20.1 87 Little Snake River 8915 23.0 25.8 89 29.4 30.1 98 Old Battle 10000 26.8 31.6 85 25.0 35.2 71 Sage Creek Basin 7850 7.5 11.4 66 11.0 14.7 75 Sandstone RS 8150 9.4 12.7 74 9.7 18.4 53 Whiskey Park 8950 25.8 27.6 93 26.9 28.1 96 ----- ----- Basin Index (%) 82 82 UPPER GREEN RIVER Big Sandy Opening 9080 14.0 12.8 109 13.7 13.3 103 Blind Bull Sum 8650 36.0 23.4 154 21.4 19.4 110 East Rim Divide 7930 13.0 10.2 127 13.1 11.7 112 Elkhart Park G.S. 9400 13.2 12.3 107 12.5 13.3 94 Gros Ventre Summit 8750 17.4 12.8 136 16.3 12.9 126 Gunsight Pass 9820 18.7 13.9 135 17.8 13.9 128 Kendall R.S. 7740 15.6 11.2 139 16.7 14.1 118 Loomis Park 8240 19.2 13.8 139 19.7 17.3 114 New Fork Lake 8340 12.4 10.2 122 12.0 10.8 111 Pocket Creek 9360 9.7 -M * 9.7 -M * Snider Basin 8060 12.8 12.3 104 15.3 14.1 109 Spring Creek Divide 9000 28.2 22.6 125 26.1 23.7 110 Triple Peak 8500 34.0 21.6 157 33.7 25.2 134 ----- ----- Basin Index (%) 132 115 LOWER GREEN RIVER Blacks Fork Jct 8869 6.9 -M * 9.6 -M * Buck Pasture 9632 11.9 -M * 13.9 -M * EF Blacks Fork GS 9360 10.4 -M * 6.6 -M * Hams Fork 7840 9.1 10.3 88 10.1 11.4 89 Hewinta 9500 7.5 10.8 69 11.8 14.1 84 Hickerson Park 9122 6.3 7.9 80 8.1 10.3 79 Hole-in-Rock 9168 7.1 7.1 100 8.6 9.8 88 Indian Creek 9425 23.2 24.8 94 17.0 22.5 76 Kelley R.S. 8180 14.1 14.5 97 15.5 18.1 86 Spirit Lk 10235 10.8 -M * 12.1 -M * Steel Creek Park 10158 14.4 15.9 91 14.5 16.6 87 ----- ----- Basin Index (%) 89 83 UPPER BEAR RIVER Bear River RS 8777 4.8 -M * 10.9 -M * Bug Lake 7987 14.4 18.7 77 17.0 19.4 88 Burts Miller Ranch 8000 2.2 -M * 6.4 -M * Chalk Creek #1 9171 15.2 24.5 62 17.0 25.3 67 Hayden Fork 9130 10.8 15.2 71 17.0 21.2 80 Kelley R.S. 8180 14.1 14.5 97 15.5 18.1 86 Lily Lake 9133 9.4 12.8 73 11.8 17.3 68 Monte Cristo 8932 23.2 27.8 83 22.8 26.0 88 Salt River Summit 7640 11.1 12.6 88 13.8 16.6 83 ----- ----- Basin Index (%) 78 80 ----------------------------------------------------------------------------- -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.