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 19 , 2018 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 16.9 14.7 115 18.6 18.9 98 Black Bear 8170 39.3 32.4 121 36.4 34.3 106 Blind Bull Sum 8650 29.5 20.4 145 17.8 17.6 101 Cottonwood Creek 7670 19.9 19.7 101 22.1 21.8 101 East Rim Divide 7930 11.0 9.5 116 10.8 10.5 103 Grand Targhee 9260 41.3 32.9 126 26.8 26.9 100 Granite Creek 6770 16.3 15.0 109 18.2 18.1 101 Grassy Lake 7265 29.1 29.3 99 32.1 32.5 99 Gros Ventre Summit 8750 13.1 11.6 113 12.7 11.4 111 Gunsight Pass 9820 14.5 12.0 121 14.1 12.0 118 Lewis Lake Divide 7850 34.6 27.6 125 35.4 31.9 111 Phillips Bench 8200 23.2 22.3 104 23.8 25.2 94 Salt River Summit 7640 9.9 12.0 82 11.4 14.9 77 Snake River Station 6920 16.9 15.1 112 21.7 20.3 107 Spring Creek Divide 9000 23.6 20.9 113 22.1 21.3 104 Thumb Divide 7980 17.3 14.0 124 17.1 16.4 104 Togwotee Pass 9580 28.6 20.5 140 28.9 21.7 133 Two Ocean Plateau 9240 34.3 23.9 144 27.1 24.2 112 Willow Creek 8080 29.8 25.4 117 31.1 29.8 104 Younts Peak 8350 -M 13.4 * -M 14.0 * ----- ----- Basin Index (%) 118 105 MADISON-GALLATIN Black Bear 8170 39.3 32.4 121 36.4 34.3 106 Canyon 7870 16.0 11.7 137 18.1 14.5 125 Madison Plateau 7750 25.0 20.0 125 24.6 23.5 105 West Yellowstone 6700 12.7 9.9 128 15.8 12.7 124 Whiskey Creek 6800 15.2 14.1 108 17.3 18.0 96 ----- ----- Basin Index (%) 123 109 YELLOWSTONE Beartooth Lake 9360 36.0 19.1 188 31.1 17.6 177 Burnt Mtn 5880 6.6 4.5 147 13.1 10.8 121 Canyon 7870 16.0 11.7 137 18.1 14.5 125 Cole Creek 7850 13.0 11.9 109 8.3 10.6 78 Evening Star 9200 36.8 22.0 167 40.0 24.3 165 Fisher Creek 9100 48.0 28.2 170 42.2 28.4 149 Northeast Entrance 7350 13.2 9.0 147 16.5 10.9 151 Parker Peak 9400 30.4 17.5 174 26.7 15.6 171 Sylvan Lake 8420 22.7 18.0 126 24.3 19.8 123 Thumb Divide 7980 17.3 14.0 124 17.1 16.4 104 Two Ocean Plateau 9240 34.3 23.9 144 27.1 24.2 112 White Mill 8700 37.5 19.7 190 28.7 21.1 136 Wolverine 7650 19.9 8.9 224 19.2 10.9 176 ----- ----- Basin Index (%) 159 139 WIND RIVER Burroughs Creek 8750 15.0 -M * 16.5 -M * Castle Creek 8400 7.9 -M * 9.1 -M * Cold Springs 9630 8.8 6.3 140 8.9 8.5 105 Deer Park 9700 10.6 13.1 81 13.2 17.0 78 Hobbs Park 10100 14.7 11.6 127 12.4 11.0 113 Kirwin 9550 17.9 8.4 213 16.4 9.9 166 Little Warm 9370 14.2 9.2 154 14.7 11.1 132 Owl Creek 8975 3.6 4.6 78 5.4 4.9 110 South Pass 9040 10.3 13.6 76 -M 15.2 * St. Lawrence Alt 8620 2.9 6.1 48 7.3 7.4 99 Togwotee Pass 9580 28.6 20.5 140 28.9 21.7 133 Townsend Creek 8700 6.3 8.1 78 7.7 10.0 77 ----- ----- Basin Index (%) 116 113 BIGHORN BASIN Bald Mtn. 9380 18.5 16.4 113 12.9 14.7 88 Bear Trap Meadow 8200 8.4 5.0 168 8.8 7.0 126 Bone Springs Div 9350 16.5 14.0 118 12.3 13.3 92 Grave Springs 8550 5.9 8.1 73 4.5 8.9 51 Kirwin 9550 17.9 8.4 213 16.4 9.9 166 Marquette 8760 5.0 -M * 8.7 -M * Middle Powder 7760 7.9 9.6 82 -M 9.9 * Owl Creek 8975 3.6 4.6 78 5.4 4.9 110 Powder River Pass 9480 14.8 9.0 164 13.5 10.7 126 Shell Creek 9580 18.3 12.8 143 13.8 11.8 117 Timber Creek 7950 2.9 4.2 69 -M 6.1 * ----- ----- Basin Index (%) 125 108 SHOSHONE RIVER Blackwater 9780 31.5 20.6 153 29.3 18.0 163 Evening Star 9200 36.8 22.0 167 40.0 24.3 165 Marquette 8760 5.0 -M * 8.7 -M * Sylvan Road 7120 13.3 10.4 128 19.5 15.1 129 Younts Peak 8350 -M 13.4 * -M 14.0 * ----- ----- Basin Index (%) 154 155 POWDER RIVER Bear Trap Meadow 8200 8.4 5.0 168 8.8 7.0 126 Cloud Peak Reservoir 9860 13.4 12.8 105 11.9 11.1 107 Grave Springs 8550 5.9 8.1 73 4.5 8.9 51 Hansen Sawmill 8360 6.6 5.6 118 8.0 7.1 113 Middle Powder 7760 7.9 9.6 82 -M 9.9 * Powder River Pass 9480 14.8 9.0 164 13.5 10.7 126 Soldier Park 8720 5.4 -M * 8.0 -M * ----- ----- Basin Index (%) 114 104 TONGUE RIVER Big Goose 7990 6.4 7.7 83 6.7 9.2 73 Bone Springs Div 9350 16.5 14.0 118 12.3 13.3 92 Burgess Junction 7880 8.0 9.5 84 6.9 10.4 66 Dome Lake 8880 12.6 10.1 125 9.7 11.4 85 Little Goose 8870 7.8 -M * 9.8 -M * Sucker Creek 8880 8.8 10.8 81 6.5 12.1 54 Tie Creek 6870 3.7 5.0 74 7.3 9.7 75 ----- ----- Basin Index (%) 98 75 BELLE FOURCHE Cole Canyon 5910 6.5 5.5 118 8.1 7.8 104 ----- ----- Basin Index (%) 118 104 CHEYENNE RIVER BASIN Blind Park 6890 7.2 7.2 100 10.0 10.5 95 North Rapid Creek 6130 6.9 6.5 106 7.5 8.5 88 ----- ----- Basin Index (%) 103 92 UPPER N. PLATTE Arapaho Ridge 10960 17.2 18.0 96 16.9 19.6 86 Blackhall Mtn 9820 23.9 -M * 23.6 -M * Columbine 9160 20.3 21.9 93 20.4 22.7 90 Divide Peak 8880 12.6 17.5 72 16.1 19.0 85 Joe Wright 10120 15.3 19.0 81 24.8 22.7 109 Laprele Creek 8375 5.7 9.1 63 7.0 10.8 65 Med Bow 10500 35.6 -M * 28.7 -M * North French Creek 10130 23.7 24.9 95 23.4 23.5 100 Never Summer 10280 16.5 17.7 93 13.6 -M * Old Battle 10000 22.0 26.2 84 21.3 31.2 68 Rawah 9020 9.6 9.3 103 13.1 12.0 109 Sage Creek Basin 7850 8.5 11.6 73 9.3 12.9 72 Sand Lake 10050 22.9 24.4 94 19.3 21.5 90 South Brush Creek 8440 9.0 11.1 81 10.2 13.2 77 Tower 10500 29.8 39.7 75 26.1 35.5 74 Webber Springs 9250 16.5 21.0 79 19.1 23.7 81 Willow Creek Pass 9540 11.8 10.8 109 12.7 11.6 109 Zirkel 9340 24.0 25.8 93 27.5 25.3 109 ----- ----- Basin Index (%) 86 88 SWEETWATER Deer Park 9700 10.6 13.1 81 13.2 17.0 78 Larsen Creek 9000 10.3 11.1 93 10.3 -M * South Pass 9040 10.3 13.6 76 -M 15.2 * ----- ----- Basin Index (%) 83 78* LOWER N. PLATTE Casper Mtn. 7900 7.3 12.1 60 5.6 12.6 44 Laprele Creek 8375 5.7 9.1 63 7.0 10.8 65 Reno Hill 8400 8.7 11.9 73 9.7 12.8 76 Windy Peak 7900 5.5 7.0 79 7.0 9.0 78 ----- ----- Basin Index (%) 68 65 LARAMIE RIVER Brooklyn Lake 10240 21.3 17.6 121 21.7 18.3 119 Cinnabar Park 9574 19.1 17.9 107 22.2 21.2 105 Crow Creek 8330 3.7 7.0 53 9.7 8.8 110 Deadman Hill 10220 17.9 13.8 130 17.3 14.9 116 Rawah 9020 9.6 9.3 103 13.1 12.0 109 Roach 9700 12.1 13.9 87 15.1 16.8 90 ----- ----- Basin Index (%) 105 108 S. PLATTE Black Mountain 8920 9.4 -M * 12.2 -M * Crow Creek 8330 3.7 7.0 53 9.7 8.8 110 Deadman Hill 10220 17.9 13.8 130 17.3 14.9 116 ----- ----- Basin Index (%) 104 114 LITTLE SNAKE RIVER Battle Mountain 7440 6.3 11.3 56 8.4 13.4 63 Divide Peak 8880 12.6 17.5 72 16.1 19.0 85 Elk River 8700 13.1 17.3 76 14.0 17.9 78 Little Snake River 8915 18.4 21.0 88 24.2 26.3 92 Old Battle 10000 22.0 26.2 84 21.3 31.2 68 Sage Creek Basin 7850 8.5 11.6 73 9.3 12.9 72 Sandstone RS 8150 7.9 12.0 66 7.4 16.6 45 Whiskey Park 8950 20.8 24.2 86 22.2 24.8 90 ----- ----- Basin Index (%) 78 76 UPPER GREEN RIVER Big Sandy Opening 9080 11.6 11.6 100 11.6 11.7 99 Blind Bull Sum 8650 29.5 20.4 145 17.8 17.6 101 East Rim Divide 7930 11.0 9.5 116 10.8 10.5 103 Elkhart Park G.S. 9400 11.1 10.6 105 10.8 11.8 92 Gros Ventre Summit 8750 13.1 11.6 113 12.7 11.4 111 Gunsight Pass 9820 14.5 12.0 121 14.1 12.0 118 Kendall R.S. 7740 13.6 11.2 121 13.9 12.9 108 Loomis Park 8240 15.9 13.3 120 16.6 15.5 107 New Fork Lake 8340 11.1 9.3 119 10.1 9.7 104 Pocket Creek 9360 8.0 -M * 7.9 -M * Snider Basin 8060 12.1 11.0 110 13.6 12.7 107 Spring Creek Divide 9000 23.6 20.9 113 22.1 21.3 104 Triple Peak 8500 26.0 19.3 135 27.8 22.6 123 ----- ----- Basin Index (%) 120 107 LOWER GREEN RIVER Blacks Fork Jct 8869 6.8 -M * 8.2 -M * Buck Pasture 9632 10.8 -M * 11.7 -M * EF Blacks Fork GS 9360 10.2 -M * -M -M * Hams Fork 7840 8.5 10.2 83 8.5 10.1 84 Hewinta 9500 7.7 9.8 79 10.3 12.2 84 Hickerson Park 9122 7.6 6.6 115 7.1 8.8 81 Hole-in-Rock 9168 6.9 6.6 105 7.5 8.2 91 Indian Creek 9425 19.3 21.2 91 14.2 20.0 71 Kelley R.S. 8180 12.3 13.3 92 13.3 16.1 83 Spirit Lk 10235 9.2 -M * 10.6 -M * Steel Creek Park 10158 13.6 13.4 101 12.5 14.2 88 ----- ----- Basin Index (%) 94 82 UPPER BEAR RIVER Bear River RS 8777 8.0 -M * 9.7 -M * Bug Lake 7987 14.2 16.6 86 14.5 17.3 84 Burts Miller Ranch 8000 5.1 -M * 5.9 -M * Chalk Creek #1 9171 13.5 21.0 64 14.5 22.0 66 Hayden Fork 9130 11.2 14.2 79 14.1 18.4 77 Kelley R.S. 8180 12.3 13.3 92 13.3 16.1 83 Lily Lake 9133 8.4 11.4 74 10.3 14.9 69 Monte Cristo 8932 19.1 24.2 79 18.0 23.0 78 Salt River Summit 7640 9.9 12.0 82 11.4 14.9 77 ----- ----- Basin Index (%) 79 76 ----------------------------------------------------------------------------- -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.