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: MARCH 12 , 2018 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 16.8 13.8 122 18.2 18.3 99 Black Bear 8170 38.3 31.6 121 35.3 33.3 106 Blind Bull Sum 8650 28.7 19.6 146 17.2 17.0 101 Cottonwood Creek 7670 19.0 18.6 102 20.9 20.9 100 East Rim Divide 7930 10.6 9.5 112 10.4 10.2 102 Grand Targhee 9260 40.5 32.1 126 26.3 25.7 102 Granite Creek 6770 16.1 14.7 110 17.8 17.6 101 Grassy Lake 7265 28.2 27.7 102 31.5 31.4 100 Gros Ventre Summit 8750 12.2 10.9 112 12.2 11.0 111 Gunsight Pass 9820 13.7 11.6 118 13.4 11.7 115 Lewis Lake Divide 7850 34.2 26.7 128 34.9 30.9 113 Phillips Bench 8200 22.2 21.4 104 23.0 24.3 95 Salt River Summit 7640 9.4 11.3 83 10.8 14.3 76 Snake River Station 6920 16.8 15.2 111 21.3 19.7 108 Spring Creek Divide 9000 22.5 19.7 114 21.3 20.5 104 Thumb Divide 7980 17.1 13.3 129 16.8 15.8 106 Togwotee Pass 9580 27.8 19.6 142 28.3 20.8 136 Two Ocean Plateau 9240 33.6 23.2 145 -M 23.4 * Willow Creek 8080 27.9 24.2 115 30.1 28.7 105 Younts Peak 8350 -M 12.4 * -M 13.5 * ----- ----- Basin Index (%) 119 105 MADISON-GALLATIN Black Bear 8170 38.3 31.6 121 35.3 33.3 106 Canyon 7870 15.8 11.5 137 17.8 14.0 127 Madison Plateau 7750 24.4 19.4 126 24.0 22.9 105 West Yellowstone 6700 12.5 9.8 128 15.5 12.4 125 Whiskey Creek 6800 14.8 13.3 111 17.0 17.5 97 ----- ----- Basin Index (%) 124 109 YELLOWSTONE Beartooth Lake 9360 35.9 18.4 195 31.1 16.9 184 Burnt Mtn 5880 6.9 4.3 160 13.1 10.2 128 Canyon 7870 15.8 11.5 137 17.8 14.0 127 Cole Creek 7850 12.8 11.3 113 8.3 10.0 83 Evening Star 9200 36.7 21.1 174 31.3 23.5 133 Fisher Creek 9100 47.7 27.2 175 41.1 27.4 150 Northeast Entrance 7350 13.5 8.7 155 16.4 10.5 156 Parker Peak 9400 30.2 16.8 180 23.5 15.0 157 Sylvan Lake 8420 22.2 17.1 130 23.7 19.1 124 Thumb Divide 7980 17.1 13.3 129 16.8 15.8 106 Two Ocean Plateau 9240 33.6 23.2 145 -M 23.4 * White Mill 8700 37.5 19.3 194 28.5 20.3 140 Wolverine 7650 20.0 9.0 222 19.2 10.5 183 ----- ----- Basin Index (%) 164 140 WIND RIVER Burroughs Creek 8750 14.6 -M * 16.7 -M * Castle Creek 8400 7.8 -M * 9.1 -M * Cold Springs 9630 8.4 6.0 140 8.9 8.1 110 Deer Park 9700 9.5 12.2 78 12.4 16.3 76 Hobbs Park 10100 14.1 11.0 128 12.2 10.4 117 Kirwin 9550 17.8 7.9 225 16.3 9.4 173 Little Warm 9370 13.7 8.8 156 14.3 10.6 135 Owl Creek 8975 3.6 4.4 82 5.4 4.6 117 South Pass 9040 9.5 12.6 75 -M 14.6 * St. Lawrence Alt 8620 3.0 5.9 51 7.2 7.1 101 Togwotee Pass 9580 27.8 19.6 142 28.3 20.8 136 Townsend Creek 8700 6.0 7.4 81 7.4 9.4 79 ----- ----- Basin Index (%) 118 116 BIGHORN BASIN Bald Mtn. 9380 18.1 16.0 113 12.7 14.0 91 Bear Trap Meadow 8200 8.1 4.7 172 8.6 6.6 130 Bone Springs Div 9350 16.1 13.3 121 12.0 12.6 95 Grave Springs 8550 5.6 7.5 75 4.5 8.4 54 Kirwin 9550 17.8 7.9 225 16.3 9.4 173 Marquette 8760 5.2 -M * 8.8 -M * Middle Powder 7760 7.3 8.9 82 -M 9.4 * Owl Creek 8975 3.6 4.4 82 5.4 4.6 117 Powder River Pass 9480 14.4 8.6 167 13.2 10.2 129 Shell Creek 9580 18.0 12.3 146 13.6 11.2 121 Timber Creek 7950 2.9 4.1 71 -M 5.6 * ----- ----- Basin Index (%) 128 112 SHOSHONE RIVER Blackwater 9780 31.2 19.2 162 29.1 17.3 168 Evening Star 9200 36.7 21.1 174 31.3 23.5 133 Marquette 8760 5.2 -M * 8.8 -M * Sylvan Road 7120 13.6 10.0 136 19.4 14.6 133 Younts Peak 8350 -M 12.4 * -M 13.5 * ----- ----- Basin Index (%) 162 144 POWDER RIVER Bear Trap Meadow 8200 8.1 4.7 172 8.6 6.6 130 Cloud Peak Reservoir 9860 13.1 11.9 110 11.6 10.4 112 Grave Springs 8550 5.6 7.5 75 4.5 8.4 54 Hansen Sawmill 8360 6.7 5.2 129 8.1 6.6 123 Middle Powder 7760 7.3 8.9 82 -M 9.4 * Powder River Pass 9480 14.4 8.6 167 13.2 10.2 129 Soldier Park 8720 5.4 -M * 8.0 -M * ----- ----- Basin Index (%) 118 109 TONGUE RIVER Big Goose 7990 6.2 7.0 89 6.7 8.5 79 Bone Springs Div 9350 16.1 13.3 121 12.0 12.6 95 Burgess Junction 7880 7.8 9.3 84 6.9 9.8 70 Dome Lake 8880 12.4 9.4 132 9.6 10.7 90 Little Goose 8870 7.5 -M * 9.7 -M * Sucker Creek 8880 8.6 10.2 84 6.6 11.4 58 Tie Creek 6870 3.7 4.7 79 7.3 9.0 81 ----- ----- Basin Index (%) 102 79 BELLE FOURCHE Cole Canyon 5910 5.8 5.1 114 7.5 7.4 101 ----- ----- Basin Index (%) 114 101 CHEYENNE RIVER BASIN Blind Park 6890 6.8 6.9 99 9.5 10.1 94 North Rapid Creek 6130 6.5 6.3 103 6.9 8.1 85 ----- ----- Basin Index (%) 101 90 UPPER N. PLATTE Arapaho Ridge 10960 16.6 17.8 93 16.3 18.9 86 Blackhall Mtn 9820 23.4 -M * 23.0 -M * Columbine 9160 19.4 21.2 92 19.7 21.9 90 Divide Peak 8880 11.6 17.0 68 15.1 18.1 83 Joe Wright 10120 13.7 18.5 74 23.0 21.6 106 Laprele Creek 8375 5.5 8.6 64 6.9 10.2 68 Med Bow 10500 34.1 -M * 27.8 -M * North French Creek 10130 22.5 23.3 97 22.1 22.6 98 Never Summer 10280 14.7 17.1 86 11.9 -M * Old Battle 10000 21.5 25.7 84 21.0 30.0 70 Rawah 9020 9.1 9.3 98 12.3 11.6 106 Sage Creek Basin 7850 7.8 11.7 67 8.4 12.5 67 Sand Lake 10050 21.9 22.8 96 18.6 20.5 91 South Brush Creek 8440 8.0 11.2 71 9.6 12.6 76 Tower 10500 28.6 38.4 74 25.5 34.1 75 Webber Springs 9250 16.3 20.2 81 18.8 22.8 82 Willow Creek Pass 9540 10.7 10.3 104 11.5 11.1 104 Zirkel 9340 23.4 25.3 92 27.1 24.7 110 ----- ----- Basin Index (%) 84 87 SWEETWATER Deer Park 9700 9.5 12.2 78 12.4 16.3 76 Larsen Creek 9000 9.5 10.5 90 9.5 -M * South Pass 9040 9.5 12.6 75 -M 14.6 * ----- ----- Basin Index (%) 81 76* LOWER N. PLATTE Casper Mtn. 7900 6.3 11.6 54 5.3 12.1 44 Laprele Creek 8375 5.5 8.6 64 6.9 10.2 68 Reno Hill 8400 7.9 11.3 70 9.0 12.2 74 Windy Peak 7900 5.0 6.6 76 6.7 8.6 78 ----- ----- Basin Index (%) 65 65 LARAMIE RIVER Brooklyn Lake 10240 20.7 17.0 122 21.3 17.5 122 Cinnabar Park 9574 19.0 17.8 107 21.6 20.7 104 Crow Creek 8330 2.3 7.1 32 8.1 8.5 95 Deadman Hill 10220 16.2 13.1 124 15.6 14.1 111 Rawah 9020 9.1 9.3 98 12.3 11.6 106 Roach 9700 11.4 13.5 84 14.5 16.0 91 ----- ----- Basin Index (%) 101 106 S. PLATTE Black Mountain 8920 7.6 -M * 10.4 -M * Crow Creek 8330 2.3 7.1 32 8.1 8.5 95 Deadman Hill 10220 16.2 13.1 124 15.6 14.1 111 ----- ----- Basin Index (%) 92 105 LITTLE SNAKE RIVER Battle Mountain 7440 5.7 10.7 53 -M 13.0 * Divide Peak 8880 11.6 17.0 68 15.1 18.1 83 Elk River 8700 13.2 17.0 78 13.9 17.2 81 Little Snake River 8915 18.5 20.3 91 23.6 26.0 91 Old Battle 10000 21.5 25.7 84 21.0 30.0 70 Sage Creek Basin 7850 7.8 11.7 67 8.4 12.5 67 Sandstone RS 8150 7.1 11.8 60 7.1 16.0 44 Whiskey Park 8950 20.4 23.5 87 21.7 24.0 90 ----- ----- Basin Index (%) 77 77 UPPER GREEN RIVER Big Sandy Opening 9080 10.6 10.8 98 10.6 11.3 94 Blind Bull Sum 8650 28.7 19.6 146 17.2 17.0 101 East Rim Divide 7930 10.6 9.5 112 10.4 10.2 102 Elkhart Park G.S. 9400 10.5 10.2 103 10.1 11.3 89 Gros Ventre Summit 8750 12.2 10.9 112 12.2 11.0 111 Gunsight Pass 9820 13.7 11.6 118 13.4 11.7 115 Kendall R.S. 7740 13.1 10.6 124 13.5 12.5 108 Loomis Park 8240 15.1 12.8 118 15.9 15.0 106 New Fork Lake 8340 10.3 9.1 113 9.7 9.4 103 Pocket Creek 9360 7.1 -M * 7.2 -M * Snider Basin 8060 11.6 10.7 108 13.4 12.2 110 Spring Creek Divide 9000 22.5 19.7 114 21.3 20.5 104 Triple Peak 8500 25.2 18.7 135 27.1 21.6 125 ----- ----- Basin Index (%) 119 107 LOWER GREEN RIVER Blacks Fork Jct 8869 6.0 -M * 7.3 -M * Buck Pasture 9632 9.1 -M * 10.0 -M * EF Blacks Fork GS 9360 9.2 -M * 4.4 -M * Hams Fork 7840 8.1 10.0 81 7.9 9.7 81 Hewinta 9500 6.8 8.7 78 9.2 11.6 79 Hickerson Park 9122 5.9 6.5 91 5.5 8.2 67 Hole-in-Rock 9168 5.1 6.2 82 5.8 7.7 75 Indian Creek 9425 17.8 20.4 87 13.2 19.1 69 Kelley R.S. 8180 11.2 12.8 88 12.3 15.5 79 Spirit Lk 10235 6.2 -M * 7.7 -M * Steel Creek Park 10158 11.9 12.7 94 10.9 13.4 81 ----- ----- Basin Index (%) 86 76 UPPER BEAR RIVER Bear River RS 8777 7.0 -M * 8.6 -M * Bug Lake 7987 13.2 16.3 81 13.4 16.6 81 Burts Miller Ranch 8000 4.0 -M * 5.3 -M * Chalk Creek #1 9171 11.6 20.2 57 12.8 21.0 61 Hayden Fork 9130 9.8 13.6 72 12.5 17.6 71 Kelley R.S. 8180 11.2 12.8 88 12.3 15.5 79 Lily Lake 9133 7.3 11.2 65 9.0 14.3 63 Monte Cristo 8932 16.8 23.0 73 16.4 22.0 75 Salt River Summit 7640 9.4 11.3 83 10.8 14.3 76 ----- ----- Basin Index (%) 73 72 ----------------------------------------------------------------------------- -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.