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 THURSDAY: MARCH 15 , 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 14.2 118 18.4 18.6 99 Black Bear 8170 38.6 32.0 121 36.0 33.7 107 Blind Bull Sum 8650 29.5 20.0 148 17.7 17.2 103 Cottonwood Creek 7670 19.3 18.9 102 21.5 21.2 101 East Rim Divide 7930 10.7 9.5 113 10.7 10.3 104 Grand Targhee 9260 40.9 32.5 126 26.7 26.5 101 Granite Creek 6770 16.1 14.9 108 18.0 17.7 102 Grassy Lake 7265 28.5 28.5 100 31.8 31.8 100 Gros Ventre Summit 8750 12.6 11.1 114 12.5 11.1 113 Gunsight Pass 9820 14.0 11.7 120 13.7 11.9 115 Lewis Lake Divide 7850 34.7 27.2 128 35.2 31.3 112 Phillips Bench 8200 22.7 21.8 104 23.3 24.6 95 Salt River Summit 7640 9.8 11.6 84 11.1 14.5 77 Snake River Station 6920 16.7 15.2 110 21.6 19.9 109 Spring Creek Divide 9000 23.1 20.1 115 21.8 20.8 105 Thumb Divide 7980 17.8 13.6 131 17.0 16.0 106 Togwotee Pass 9580 28.3 20.0 142 28.7 21.1 136 Two Ocean Plateau 9240 34.0 23.5 145 26.5 23.7 112 Willow Creek 8080 29.8 24.7 121 30.5 29.1 105 Younts Peak 8350 -M 12.8 * -M 13.7 * ----- ----- Basin Index (%) 120 105 MADISON-GALLATIN Black Bear 8170 38.6 32.0 121 36.0 33.7 107 Canyon 7870 16.0 11.6 138 18.0 14.2 127 Madison Plateau 7750 24.6 19.8 124 24.3 23.1 105 West Yellowstone 6700 12.8 9.9 129 15.6 12.5 125 Whiskey Creek 6800 15.0 13.6 110 17.1 17.7 97 ----- ----- Basin Index (%) 123 110 YELLOWSTONE Beartooth Lake 9360 36.1 18.6 194 31.5 17.1 184 Burnt Mtn 5880 6.7 4.4 152 13.1 10.5 125 Canyon 7870 16.0 11.6 138 18.0 14.2 127 Cole Creek 7850 12.8 11.5 111 8.3 10.2 81 Evening Star 9200 37.2 21.6 172 -M 23.7 * Fisher Creek 9100 47.6 27.7 172 41.8 27.7 151 Northeast Entrance 7350 13.3 8.7 153 16.4 10.7 153 Parker Peak 9400 30.4 17.1 178 -M 15.3 * Sylvan Lake 8420 22.0 17.5 126 23.9 19.4 123 Thumb Divide 7980 17.8 13.6 131 17.0 16.0 106 Two Ocean Plateau 9240 34.0 23.5 145 26.5 23.7 112 White Mill 8700 37.5 19.4 193 28.6 20.6 139 Wolverine 7650 19.9 8.8 226 19.3 10.7 180 ----- ----- Basin Index (%) 162 135 WIND RIVER Burroughs Creek 8750 14.8 -M * 17.0 -M * Castle Creek 8400 7.8 -M * 9.2 -M * Cold Springs 9630 8.8 6.1 144 9.1 8.2 111 Deer Park 9700 9.9 12.3 80 12.6 16.6 76 Hobbs Park 10100 14.6 11.2 130 12.4 10.6 117 Kirwin 9550 18.0 8.1 222 16.4 9.6 171 Little Warm 9370 13.9 9.0 154 14.4 10.8 133 Owl Creek 8975 3.7 4.5 82 5.4 4.7 115 South Pass 9040 9.7 12.9 75 -M 14.8 * St. Lawrence Alt 8620 3.0 5.9 51 7.3 7.2 101 Togwotee Pass 9580 28.3 20.0 142 28.7 21.1 136 Townsend Creek 8700 6.3 7.6 83 7.8 9.6 81 ----- ----- Basin Index (%) 119 116 BIGHORN BASIN Bald Mtn. 9380 18.0 16.2 111 12.8 14.3 90 Bear Trap Meadow 8200 8.2 4.8 171 8.7 6.8 128 Bone Springs Div 9350 16.1 13.6 118 12.3 12.8 96 Grave Springs 8550 5.7 7.7 74 4.6 8.6 53 Kirwin 9550 18.0 8.1 222 16.4 9.6 171 Marquette 8760 5.3 -M * 8.9 -M * Middle Powder 7760 7.3 9.1 80 -M 9.6 * Owl Creek 8975 3.7 4.5 82 5.4 4.7 115 Powder River Pass 9480 14.2 8.8 161 13.4 10.4 129 Shell Creek 9580 18.4 12.5 147 13.6 11.4 119 Timber Creek 7950 3.0 4.2 71 -M 5.8 * ----- ----- Basin Index (%) 126 111 SHOSHONE RIVER Blackwater 9780 31.3 19.7 159 29.3 17.6 166 Evening Star 9200 37.2 21.6 172 -M 23.7 * Marquette 8760 5.3 -M * 8.9 -M * Sylvan Road 7120 13.1 10.2 128 19.4 14.8 131 Younts Peak 8350 -M 12.8 * -M 13.7 * ----- ----- Basin Index (%) 158 150* POWDER RIVER Bear Trap Meadow 8200 8.2 4.8 171 8.7 6.8 128 Cloud Peak Reservoir 9860 13.3 12.2 109 11.9 10.6 112 Grave Springs 8550 5.7 7.7 74 4.6 8.6 53 Hansen Sawmill 8360 6.8 5.3 128 8.2 6.8 121 Middle Powder 7760 7.3 9.1 80 -M 9.6 * Powder River Pass 9480 14.2 8.8 161 13.4 10.4 129 Soldier Park 8720 5.5 -M * 8.1 -M * ----- ----- Basin Index (%) 116 108 TONGUE RIVER Big Goose 7990 6.3 7.4 85 6.8 8.7 78 Bone Springs Div 9350 16.1 13.6 118 12.3 12.8 96 Burgess Junction 7880 7.9 9.4 84 7.1 10.0 71 Dome Lake 8880 12.5 9.7 129 9.7 10.9 89 Little Goose 8870 7.5 -M * 9.7 -M * Sucker Creek 8880 8.6 10.4 83 6.7 11.7 57 Tie Creek 6870 3.7 4.7 79 7.2 9.3 77 ----- ----- Basin Index (%) 100 79 BELLE FOURCHE Cole Canyon 5910 5.7 5.4 106 7.5 7.7 97 ----- ----- Basin Index (%) 106 97 CHEYENNE RIVER BASIN Blind Park 6890 6.8 7.1 96 9.6 10.2 94 North Rapid Creek 6130 6.5 6.4 102 7.0 8.3 84 ----- ----- Basin Index (%) 99 90 UPPER N. PLATTE Arapaho Ridge 10960 16.6 18.0 92 16.5 19.0 87 Blackhall Mtn 9820 23.6 -M * 23.0 -M * Columbine 9160 19.9 21.5 93 20.0 22.2 90 Divide Peak 8880 12.1 17.2 70 15.2 18.4 83 Joe Wright 10120 14.1 18.7 75 23.0 22.0 105 Laprele Creek 8375 5.5 8.8 62 7.1 10.4 68 Med Bow 10500 34.2 -M * 28.3 -M * North French Creek 10130 22.7 23.9 95 22.2 23.0 97 Never Summer 10280 14.9 17.3 86 11.9 -M * Old Battle 10000 21.5 26.0 83 21.3 30.5 70 Rawah 9020 8.8 9.2 96 12.4 11.6 107 Sage Creek Basin 7850 7.9 11.8 67 8.6 12.8 67 Sand Lake 10050 22.2 23.5 94 18.7 20.9 89 South Brush Creek 8440 8.2 11.2 73 9.7 12.9 75 Tower 10500 28.7 38.9 74 26.3 34.6 76 Webber Springs 9250 16.4 20.5 80 18.8 23.1 81 Willow Creek Pass 9540 10.8 10.5 103 11.6 11.3 103 Zirkel 9340 23.8 25.5 93 27.2 24.8 110 ----- ----- Basin Index (%) 84 87 SWEETWATER Deer Park 9700 9.9 12.3 80 12.6 16.6 76 Larsen Creek 9000 10.1 10.7 94 9.9 -M * South Pass 9040 9.7 12.9 75 -M 14.8 * ----- ----- Basin Index (%) 83 76* LOWER N. PLATTE Casper Mtn. 7900 6.3 11.8 53 5.5 12.3 45 Laprele Creek 8375 5.5 8.8 62 7.1 10.4 68 Reno Hill 8400 8.0 11.5 70 9.2 12.4 74 Windy Peak 7900 5.1 6.7 76 7.0 8.7 80 ----- ----- Basin Index (%) 64 66 LARAMIE RIVER Brooklyn Lake 10240 20.8 17.3 120 21.4 17.8 120 Cinnabar Park 9574 19.1 17.8 107 21.6 20.8 104 Crow Creek 8330 2.3 7.1 32 8.2 8.6 95 Deadman Hill 10220 16.3 13.4 122 15.6 14.3 109 Rawah 9020 8.8 9.2 96 12.4 11.6 107 Roach 9700 11.5 13.5 85 14.6 16.3 90 ----- ----- Basin Index (%) 101 105 S. PLATTE Black Mountain 8920 7.7 -M * 10.4 -M * Crow Creek 8330 2.3 7.1 32 8.2 8.6 95 Deadman Hill 10220 16.3 13.4 122 15.6 14.3 109 ----- ----- Basin Index (%) 91 104 LITTLE SNAKE RIVER Battle Mountain 7440 5.5 10.9 50 8.6 13.2 65 Divide Peak 8880 12.1 17.2 70 15.2 18.4 83 Elk River 8700 13.1 17.2 76 13.9 17.4 80 Little Snake River 8915 18.2 20.5 89 23.7 26.1 91 Old Battle 10000 21.5 26.0 83 21.3 30.5 70 Sage Creek Basin 7850 7.9 11.8 67 8.6 12.8 67 Sandstone RS 8150 7.3 11.6 63 7.2 16.3 44 Whiskey Park 8950 20.8 23.8 87 21.7 24.4 89 ----- ----- Basin Index (%) 77 76 UPPER GREEN RIVER Big Sandy Opening 9080 11.1 11.1 100 11.0 11.4 96 Blind Bull Sum 8650 29.5 20.0 148 17.7 17.2 103 East Rim Divide 7930 10.7 9.5 113 10.7 10.3 104 Elkhart Park G.S. 9400 11.0 10.3 107 10.4 11.4 91 Gros Ventre Summit 8750 12.6 11.1 114 12.5 11.1 113 Gunsight Pass 9820 14.0 11.7 120 13.7 11.9 115 Kendall R.S. 7740 13.7 10.9 126 13.8 12.6 110 Loomis Park 8240 15.7 13.0 121 16.3 15.1 108 New Fork Lake 8340 10.7 9.2 116 9.9 9.5 104 Pocket Creek 9360 7.7 -M * 7.7 -M * Snider Basin 8060 11.9 10.8 110 13.5 12.4 109 Spring Creek Divide 9000 23.1 20.1 115 21.8 20.8 105 Triple Peak 8500 25.8 19.0 136 27.5 22.0 125 ----- ----- Basin Index (%) 121 108 LOWER GREEN RIVER Blacks Fork Jct 8869 6.5 -M * 7.6 -M * Buck Pasture 9632 9.6 -M * 10.4 -M * EF Blacks Fork GS 9360 9.4 -M * -M -M * Hams Fork 7840 8.4 10.1 83 8.2 9.8 84 Hewinta 9500 6.9 9.1 76 9.5 11.9 80 Hickerson Park 9122 6.1 6.6 92 5.9 8.5 69 Hole-in-Rock 9168 5.6 6.3 89 6.2 7.9 78 Indian Creek 9425 18.6 20.7 90 13.8 19.3 72 Kelley R.S. 8180 11.8 12.9 91 12.8 15.7 82 Spirit Lk 10235 7.0 -M * 8.5 -M * Steel Creek Park 10158 -M 13.0 * 11.4 13.8 83 ----- ----- Basin Index (%) 87 78 UPPER BEAR RIVER Bear River RS 8777 7.2 -M * 8.8 -M * Bug Lake 7987 13.4 16.4 82 13.7 16.9 81 Burts Miller Ranch 8000 4.1 -M * 5.5 -M * Chalk Creek #1 9171 12.1 20.5 59 13.0 21.4 61 Hayden Fork 9130 9.9 14.0 71 13.1 17.9 73 Kelley R.S. 8180 11.8 12.9 91 12.8 15.7 82 Lily Lake 9133 7.6 11.3 67 9.2 14.5 63 Monte Cristo 8932 17.4 23.5 74 16.9 22.4 75 Salt River Summit 7640 9.8 11.6 84 11.1 14.5 77 ----- ----- Basin Index (%) 74 73 ----------------------------------------------------------------------------- -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.