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 SATURDAY: MARCH 17 , 2018 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 16.7 14.4 116 18.5 18.8 98 Black Bear 8170 38.8 32.2 120 36.0 33.9 106 Blind Bull Sum 8650 29.4 20.2 146 17.6 17.4 101 Cottonwood Creek 7670 19.6 19.3 102 21.8 21.5 101 East Rim Divide 7930 10.9 9.5 115 10.8 10.4 104 Grand Targhee 9260 41.0 32.7 125 26.8 26.7 100 Granite Creek 6770 16.0 14.9 107 18.1 17.9 101 Grassy Lake 7265 28.8 28.9 100 31.9 32.2 99 Gros Ventre Summit 8750 12.8 11.3 113 12.5 11.2 112 Gunsight Pass 9820 14.3 11.9 120 13.8 12.0 115 Lewis Lake Divide 7850 34.7 27.4 127 35.2 31.6 111 Phillips Bench 8200 22.7 22.0 103 23.3 24.9 94 Salt River Summit 7640 9.7 11.8 82 11.2 14.7 76 Snake River Station 6920 17.0 15.2 112 21.6 20.1 107 Spring Creek Divide 9000 23.2 20.5 113 21.9 21.1 104 Thumb Divide 7980 17.7 13.8 128 17.0 16.2 105 Togwotee Pass 9580 28.4 20.3 140 28.7 21.4 134 Two Ocean Plateau 9240 34.0 23.7 143 26.7 24.0 111 Willow Creek 8080 29.5 25.2 117 30.9 29.4 105 Younts Peak 8350 -M 13.1 * -M 13.9 * ----- ----- Basin Index (%) 119 105 MADISON-GALLATIN Black Bear 8170 38.8 32.2 120 36.0 33.9 106 Canyon 7870 16.0 11.7 137 18.0 14.3 126 Madison Plateau 7750 24.8 19.9 125 24.3 23.3 104 West Yellowstone 6700 12.8 9.9 129 15.6 12.6 124 Whiskey Creek 6800 15.0 13.8 109 17.2 17.9 96 ----- ----- Basin Index (%) 123 109 YELLOWSTONE Beartooth Lake 9360 36.0 18.8 191 31.0 17.4 178 Burnt Mtn 5880 6.9 4.4 157 13.1 10.6 124 Canyon 7870 16.0 11.7 137 18.0 14.3 126 Cole Creek 7850 12.9 11.7 110 8.3 10.3 81 Evening Star 9200 37.0 21.8 170 -M 24.0 * Fisher Creek 9100 47.8 28.0 171 42.2 28.1 150 Northeast Entrance 7350 13.3 8.8 151 16.4 10.8 152 Parker Peak 9400 30.3 17.3 175 -M 15.4 * Sylvan Lake 8420 22.4 17.8 126 24.0 19.6 122 Thumb Divide 7980 17.7 13.8 128 17.0 16.2 105 Two Ocean Plateau 9240 34.0 23.7 143 26.7 24.0 111 White Mill 8700 37.5 19.6 191 28.6 20.9 137 Wolverine 7650 20.0 8.8 227 19.0 10.8 176 ----- ----- Basin Index (%) 161 133 WIND RIVER Burroughs Creek 8750 14.6 -M * 16.6 -M * Castle Creek 8400 7.7 -M * 8.9 -M * Cold Springs 9630 8.7 6.2 140 8.9 8.3 107 Deer Park 9700 9.9 12.6 79 12.6 16.8 75 Hobbs Park 10100 14.2 11.4 125 12.1 10.8 112 Kirwin 9550 17.8 8.3 214 16.3 9.7 168 Little Warm 9370 14.0 9.1 154 14.5 10.9 133 Owl Creek 8975 3.7 4.5 82 5.3 4.8 110 South Pass 9040 9.7 13.2 73 -M 15.0 * St. Lawrence Alt 8620 2.7 5.9 46 7.2 7.3 99 Togwotee Pass 9580 28.4 20.3 140 28.7 21.4 134 Townsend Creek 8700 6.2 7.9 78 7.7 9.8 79 ----- ----- Basin Index (%) 116 114 BIGHORN BASIN Bald Mtn. 9380 18.3 16.3 112 12.8 14.5 88 Bear Trap Meadow 8200 8.3 4.9 169 8.7 6.8 128 Bone Springs Div 9350 16.4 13.8 119 12.2 13.1 93 Grave Springs 8550 5.8 7.9 73 4.5 8.7 52 Kirwin 9550 17.8 8.3 214 16.3 9.7 168 Marquette 8760 5.0 -M * 8.7 -M * Middle Powder 7760 7.7 9.3 83 -M 9.7 * Owl Creek 8975 3.7 4.5 82 5.3 4.8 110 Powder River Pass 9480 14.6 8.9 164 13.3 10.6 125 Shell Creek 9580 18.2 12.6 144 13.7 11.6 118 Timber Creek 7950 2.9 4.2 69 -M 5.9 * ----- ----- Basin Index (%) 125 109 SHOSHONE RIVER Blackwater 9780 31.2 20.2 154 29.2 17.8 164 Evening Star 9200 37.0 21.8 170 -M 24.0 * Marquette 8760 5.0 -M * 8.7 -M * Sylvan Road 7120 13.4 10.3 130 19.5 14.9 131 Younts Peak 8350 -M 13.1 * -M 13.9 * ----- ----- Basin Index (%) 156 149* POWDER RIVER Bear Trap Meadow 8200 8.3 4.9 169 8.7 6.8 128 Cloud Peak Reservoir 9860 13.2 12.5 106 11.5 10.8 106 Grave Springs 8550 5.8 7.9 73 4.5 8.7 52 Hansen Sawmill 8360 6.6 5.5 120 8.0 6.9 116 Middle Powder 7760 7.7 9.3 83 -M 9.7 * Powder River Pass 9480 14.6 8.9 164 13.3 10.6 125 Soldier Park 8720 5.3 -M * 7.9 -M * ----- ----- Basin Index (%) 115 105 TONGUE RIVER Big Goose 7990 6.4 7.5 85 6.8 8.8 77 Bone Springs Div 9350 16.4 13.8 119 12.2 13.1 93 Burgess Junction 7880 8.0 9.4 85 6.9 10.1 68 Dome Lake 8880 12.6 9.9 127 9.7 11.1 87 Little Goose 8870 7.7 -M * 9.8 -M * Sucker Creek 8880 8.8 10.6 83 6.6 11.8 56 Tie Creek 6870 3.7 4.8 77 7.3 9.5 77 ----- ----- Basin Index (%) 100 77 BELLE FOURCHE Cole Canyon 5910 5.9 5.4 109 7.6 7.8 97 ----- ----- Basin Index (%) 109 97 CHEYENNE RIVER BASIN Blind Park 6890 7.0 7.2 97 9.8 10.3 95 North Rapid Creek 6130 6.7 6.4 105 7.3 8.4 87 ----- ----- Basin Index (%) 101 91 UPPER N. PLATTE Arapaho Ridge 10960 17.0 18.0 94 16.6 19.1 87 Blackhall Mtn 9820 23.7 -M * 23.2 -M * Columbine 9160 20.1 21.7 93 20.1 22.5 89 Divide Peak 8880 12.4 17.4 71 15.7 18.6 84 Joe Wright 10120 14.8 18.8 79 24.1 22.3 108 Laprele Creek 8375 5.7 9.0 63 7.0 10.5 67 Med Bow 10500 34.9 -M * 28.5 -M * North French Creek 10130 23.3 24.3 96 23.0 23.2 99 Never Summer 10280 15.6 17.5 89 12.7 -M * Old Battle 10000 21.9 26.1 84 21.2 30.8 69 Rawah 9020 9.4 9.2 102 12.8 11.7 109 Sage Creek Basin 7850 8.3 11.7 71 9.1 12.8 71 Sand Lake 10050 22.5 23.9 94 18.9 21.1 90 South Brush Creek 8440 8.6 11.1 77 9.9 13.0 76 Tower 10500 29.5 39.3 75 26.1 35.1 74 Webber Springs 9250 16.6 20.8 80 19.0 23.3 82 Willow Creek Pass 9540 11.2 10.7 105 11.9 11.5 103 Zirkel 9340 23.9 25.7 93 27.2 25.0 109 ----- ----- Basin Index (%) 85 87 SWEETWATER Deer Park 9700 9.9 12.6 79 12.6 16.8 75 Larsen Creek 9000 10.0 10.9 92 9.8 -M * South Pass 9040 9.7 13.2 73 -M 15.0 * ----- ----- Basin Index (%) 81 75* LOWER N. PLATTE Casper Mtn. 7900 7.0 11.9 59 5.6 12.4 45 Laprele Creek 8375 5.7 9.0 63 7.0 10.5 67 Reno Hill 8400 8.4 11.7 72 9.4 12.5 75 Windy Peak 7900 5.5 6.8 81 7.0 8.8 80 ----- ----- Basin Index (%) 68 66 LARAMIE RIVER Brooklyn Lake 10240 20.9 17.5 119 21.4 18.0 119 Cinnabar Park 9574 19.0 17.8 107 21.7 21.1 103 Crow Creek 8330 3.5 7.1 49 9.5 8.7 109 Deadman Hill 10220 16.9 13.6 124 16.3 14.5 112 Rawah 9020 9.4 9.2 102 12.8 11.7 109 Roach 9700 11.8 13.7 86 14.8 16.5 90 ----- ----- Basin Index (%) 103 107 S. PLATTE Black Mountain 8920 8.5 -M * 11.1 -M * Crow Creek 8330 3.5 7.1 49 9.5 8.7 109 Deadman Hill 10220 16.9 13.6 124 16.3 14.5 112 ----- ----- Basin Index (%) 99 111 LITTLE SNAKE RIVER Battle Mountain 7440 6.2 11.1 56 -M 13.3 * Divide Peak 8880 12.4 17.4 71 15.7 18.6 84 Elk River 8700 13.4 17.3 77 14.0 17.6 80 Little Snake River 8915 18.3 20.7 88 23.9 26.2 91 Old Battle 10000 21.9 26.1 84 21.2 30.8 69 Sage Creek Basin 7850 8.3 11.7 71 9.1 12.8 71 Sandstone RS 8150 7.8 11.7 67 7.2 16.4 44 Whiskey Park 8950 20.9 24.0 87 22.0 24.5 90 ----- ----- Basin Index (%) 78 77 UPPER GREEN RIVER Big Sandy Opening 9080 11.2 11.3 99 11.1 11.6 96 Blind Bull Sum 8650 29.4 20.2 146 17.6 17.4 101 East Rim Divide 7930 10.9 9.5 115 10.8 10.4 104 Elkhart Park G.S. 9400 10.8 10.5 103 10.4 11.6 90 Gros Ventre Summit 8750 12.8 11.3 113 12.5 11.2 112 Gunsight Pass 9820 14.3 11.9 120 13.8 12.0 115 Kendall R.S. 7740 13.7 11.0 125 13.7 12.8 107 Loomis Park 8240 15.9 13.1 121 16.4 15.3 107 New Fork Lake 8340 10.7 9.2 116 9.9 9.6 103 Pocket Creek 9360 7.6 -M * 7.6 -M * Snider Basin 8060 11.9 10.9 109 13.5 12.6 107 Spring Creek Divide 9000 23.2 20.5 113 21.9 21.1 104 Triple Peak 8500 25.8 19.2 134 27.6 22.3 124 ----- ----- Basin Index (%) 120 107 LOWER GREEN RIVER Blacks Fork Jct 8869 6.5 -M * 7.8 -M * Buck Pasture 9632 9.9 -M * 11.0 -M * EF Blacks Fork GS 9360 9.6 -M * -M -M * Hams Fork 7840 8.5 10.2 83 8.4 10.0 84 Hewinta 9500 6.8 9.4 72 9.7 12.0 81 Hickerson Park 9122 6.6 6.6 100 6.3 8.6 73 Hole-in-Rock 9168 5.8 6.4 91 6.5 8.1 80 Indian Creek 9425 19.0 20.9 91 13.9 19.7 71 Kelley R.S. 8180 12.0 13.1 92 13.0 15.9 82 Spirit Lk 10235 7.8 -M * 9.2 -M * Steel Creek Park 10158 11.7 13.2 89 11.6 14.0 83 ----- ----- Basin Index (%) 88 79 UPPER BEAR RIVER Bear River RS 8777 7.2 -M * 9.0 -M * Bug Lake 7987 13.7 16.5 83 14.1 17.1 82 Burts Miller Ranch 8000 4.3 -M * 5.5 -M * Chalk Creek #1 9171 12.5 20.6 61 13.6 21.7 63 Hayden Fork 9130 10.2 14.1 72 13.3 18.2 73 Kelley R.S. 8180 12.0 13.1 92 13.0 15.9 82 Lily Lake 9133 7.7 11.4 68 9.5 14.7 65 Monte Cristo 8932 18.0 23.9 75 17.2 22.7 76 Salt River Summit 7640 9.7 11.8 82 11.2 14.7 76 ----- ----- Basin Index (%) 75 74 ----------------------------------------------------------------------------- -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.