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 29 , 2018 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 17.6 14.7 120 19.9 19.9 100 Black Bear 8170 40.1 35.4 113 39.7 36.1 110 Blind Bull Sum 8650 31.3 21.8 144 18.8 18.5 102 Cottonwood Creek 7670 21.2 20.9 101 24.3 23.3 104 East Rim Divide 7930 11.9 9.8 121 11.7 11.2 104 Grand Targhee 9260 44.9 35.4 127 28.3 28.7 99 Granite Creek 6770 17.6 14.9 118 20.2 18.9 107 Grassy Lake 7265 31.2 31.3 100 33.9 34.2 99 Gros Ventre Summit 8750 14.5 12.6 115 14.0 12.2 115 Gunsight Pass 9820 15.7 13.1 120 15.0 12.9 116 Lewis Lake Divide 7850 37.7 29.3 129 36.9 33.6 110 Phillips Bench 8200 26.8 23.8 113 26.8 26.7 100 Salt River Summit 7640 11.1 12.7 87 12.5 15.8 79 Snake River Station 6920 18.9 15.8 120 22.8 21.4 107 Spring Creek Divide 9000 26.1 22.4 117 23.9 22.6 106 Thumb Divide 7980 18.3 15.1 121 18.1 17.5 103 Togwotee Pass 9580 30.6 21.5 142 30.7 22.9 134 Two Ocean Plateau 9240 35.8 25.3 142 28.2 25.8 109 Willow Creek 8080 32.6 27.0 121 33.8 31.6 107 Younts Peak 8350 -M 13.9 * -M 14.9 * ----- ----- Basin Index (%) 120 106 MADISON-GALLATIN Black Bear 8170 40.1 35.4 113 39.7 36.1 110 Canyon 7870 16.6 12.2 136 19.0 15.2 125 Madison Plateau 7750 26.7 21.1 127 26.4 24.9 106 West Yellowstone 6700 13.5 10.2 132 16.8 13.3 126 Whiskey Creek 6800 16.3 14.8 110 18.9 19.1 99 ----- ----- Basin Index (%) 121 111 YELLOWSTONE Beartooth Lake 9360 36.9 20.7 178 33.3 18.5 180 Burnt Mtn 5880 6.8 4.5 151 13.1 11.6 113 Canyon 7870 16.6 12.2 136 19.0 15.2 125 Cole Creek 7850 13.5 13.0 104 -M 11.7 * Evening Star 9200 38.6 23.8 162 41.5 25.7 161 Fisher Creek 9100 50.1 29.4 170 44.3 30.0 148 Northeast Entrance 7350 13.6 9.8 139 17.5 11.5 152 Parker Peak 9400 31.9 18.5 172 27.8 16.5 168 Sylvan Lake 8420 24.3 18.9 129 25.5 21.0 121 Thumb Divide 7980 18.3 15.1 121 18.1 17.5 103 Two Ocean Plateau 9240 35.8 25.3 142 28.2 25.8 109 White Mill 8700 39.1 21.3 184 30.3 22.3 136 Wolverine 7650 20.2 8.9 227 19.7 11.4 173 ----- ----- Basin Index (%) 156 140 WIND RIVER Burroughs Creek 8750 15.8 -M * 17.1 -M * Castle Creek 8400 8.2 -M * 9.3 -M * Cold Springs 9630 9.7 7.1 137 9.5 9.2 103 Deer Park 9700 12.3 14.3 86 15.0 18.3 82 Hobbs Park 10100 16.6 13.0 128 14.3 12.1 118 Kirwin 9550 19.0 9.1 209 17.0 10.7 159 Little Warm 9370 15.1 10.1 150 15.7 12.0 131 Owl Creek 8975 4.3 5.1 84 5.9 5.5 107 South Pass 9040 11.7 14.6 80 8.2 16.3 50 St. Lawrence Alt 8620 3.2 6.7 48 8.2 8.2 100 Togwotee Pass 9580 30.6 21.5 142 30.7 22.9 134 Townsend Creek 8700 6.9 8.8 78 8.6 11.0 78 ----- ----- Basin Index (%) 117 105 BIGHORN BASIN Bald Mtn. 9380 19.9 17.8 112 14.1 15.9 89 Bear Trap Meadow 8200 -M 5.1 * 10.6 7.7 138 Bone Springs Div 9350 18.2 15.1 121 13.9 14.4 97 Grave Springs 8550 7.1 8.6 83 -M 9.7 * Kirwin 9550 19.0 9.1 209 17.0 10.7 159 Marquette 8760 5.7 -M * 9.5 -M * Middle Powder 7760 9.2 10.8 85 -M 10.8 * Owl Creek 8975 4.3 5.1 84 5.9 5.5 107 Powder River Pass 9480 16.0 9.8 163 15.1 11.6 130 Shell Creek 9580 20.3 14.0 145 15.4 12.8 120 Timber Creek 7950 3.4 4.5 76 -M 6.8 * ----- ----- Basin Index (%) 124 117 SHOSHONE RIVER Blackwater 9780 32.6 21.7 150 30.4 19.2 158 Evening Star 9200 38.6 23.8 162 41.5 25.7 161 Marquette 8760 5.7 -M * 9.5 -M * Sylvan Road 7120 13.7 11.0 125 20.2 15.8 128 Younts Peak 8350 -M 13.9 * -M 14.9 * ----- ----- Basin Index (%) 150 152 POWDER RIVER Bear Trap Meadow 8200 -M 5.1 * 10.6 7.7 138 Cloud Peak Reservoir 9860 15.3 13.7 112 13.8 12.2 113 Grave Springs 8550 7.1 8.6 83 -M 9.7 * Hansen Sawmill 8360 8.7 6.2 140 10.1 7.9 128 Middle Powder 7760 9.2 10.8 85 -M 10.8 * Powder River Pass 9480 16.0 9.8 163 15.1 11.6 130 Soldier Park 8720 7.2 -M * 9.8 -M * ----- ----- Basin Index (%) 115 126 TONGUE RIVER Big Goose 7990 7.9 8.4 94 8.1 10.1 80 Bone Springs Div 9350 18.2 15.1 121 13.9 14.4 97 Burgess Junction 7880 9.3 10.9 85 7.6 11.4 67 Dome Lake 8880 14.3 11.2 128 11.5 12.5 92 Little Goose 8870 9.7 -M * 11.6 -M * Sucker Creek 8880 10.4 11.2 93 7.9 13.2 60 Tie Creek 6870 4.4 5.4 81 8.4 10.5 80 ----- ----- Basin Index (%) 104 80 BELLE FOURCHE Cole Canyon 5910 7.0 5.7 123 9.4 8.4 112 ----- ----- Basin Index (%) 123 112 CHEYENNE RIVER BASIN Blind Park 6890 7.4 7.2 103 10.6 11.0 96 North Rapid Creek 6130 6.9 6.7 103 8.2 9.0 91 ----- ----- Basin Index (%) 103 94 UPPER N. PLATTE Arapaho Ridge 10960 19.3 19.3 100 18.9 20.8 91 Blackhall Mtn 9820 26.8 -M * 26.0 -M * Columbine 9160 21.7 22.3 97 22.4 24.0 93 Divide Peak 8880 13.8 19.1 72 17.2 20.1 86 Joe Wright 10120 18.2 19.9 91 27.6 24.2 114 Laprele Creek 8375 6.0 9.4 64 7.4 11.5 64 Med Bow 10500 38.3 -M * 30.7 -M * North French Creek 10130 26.5 27.3 97 25.7 25.2 102 Never Summer 10280 18.3 19.1 96 15.0 -M * Old Battle 10000 24.4 28.6 85 23.0 32.9 70 Rawah 9020 11.0 10.1 109 14.5 13.1 111 Sage Creek Basin 7850 8.2 12.5 66 10.0 13.6 74 Sand Lake 10050 25.0 26.7 94 21.3 23.1 92 South Brush Creek 8440 10.0 12.1 83 11.4 14.2 80 Tower 10500 34.1 42.7 80 26.3 37.5 70 Webber Springs 9250 18.0 22.6 80 20.7 25.1 82 Willow Creek Pass 9540 12.9 11.6 111 13.7 12.5 110 Zirkel 9340 26.3 26.2 100 29.9 26.8 112 ----- ----- Basin Index (%) 89 89 SWEETWATER Deer Park 9700 12.3 14.3 86 15.0 18.3 82 Larsen Creek 9000 11.1 11.9 93 11.1 -M * South Pass 9040 11.7 14.6 80 8.2 16.3 50 ----- ----- Basin Index (%) 86 67 LOWER N. PLATTE Casper Mtn. 7900 7.4 12.9 57 6.2 13.7 45 Laprele Creek 8375 6.0 9.4 64 7.4 11.5 64 Reno Hill 8400 9.4 12.8 73 10.6 14.1 75 Windy Peak 7900 6.1 7.7 79 7.5 9.7 77 ----- ----- Basin Index (%) 68 65 LARAMIE RIVER Brooklyn Lake 10240 23.6 19.1 124 23.5 19.6 120 Cinnabar Park 9574 20.1 19.6 103 23.4 22.7 103 Crow Creek 8330 4.2 6.8 62 10.5 9.9 106 Deadman Hill 10220 19.8 15.1 131 18.9 16.0 118 Rawah 9020 11.0 10.1 109 14.5 13.1 111 Roach 9700 13.1 15.0 87 16.4 17.9 92 ----- ----- Basin Index (%) 107 108 S. PLATTE Black Mountain 8920 10.4 -M * 13.0 -M * Crow Creek 8330 4.2 6.8 62 10.5 9.9 106 Deadman Hill 10220 19.8 15.1 131 18.9 16.0 118 ----- ----- Basin Index (%) 110 114 LITTLE SNAKE RIVER Battle Mountain 7440 6.5 10.9 60 8.9 14.2 63 Divide Peak 8880 13.8 19.1 72 17.2 20.1 86 Elk River 8700 15.0 18.0 83 15.8 18.9 84 Little Snake River 8915 20.5 22.3 92 26.6 27.8 96 Old Battle 10000 24.4 28.6 85 23.0 32.9 70 Sage Creek Basin 7850 8.2 12.5 66 10.0 13.6 74 Sandstone RS 8150 9.1 13.1 69 8.7 17.4 50 Whiskey Park 8950 23.3 25.0 93 24.4 26.4 92 ----- ----- Basin Index (%) 81 79 UPPER GREEN RIVER Big Sandy Opening 9080 13.0 12.2 107 12.8 12.5 102 Blind Bull Sum 8650 31.3 21.8 144 18.8 18.5 102 East Rim Divide 7930 11.9 9.8 121 11.7 11.2 104 Elkhart Park G.S. 9400 12.0 11.7 103 11.5 12.5 92 Gros Ventre Summit 8750 14.5 12.6 115 14.0 12.2 115 Gunsight Pass 9820 15.7 13.1 120 15.0 12.9 116 Kendall R.S. 7740 14.4 11.3 127 14.6 13.6 107 Loomis Park 8240 17.1 14.4 119 17.6 16.4 107 New Fork Lake 8340 11.8 10.2 116 10.9 10.2 107 Pocket Creek 9360 8.7 -M * 8.8 -M * Snider Basin 8060 12.7 11.8 108 14.4 13.4 107 Spring Creek Divide 9000 26.1 22.4 117 23.9 22.6 106 Triple Peak 8500 28.8 21.1 136 29.7 24.0 124 ----- ----- Basin Index (%) 121 108 LOWER GREEN RIVER Blacks Fork Jct 8869 7.7 -M * 8.6 -M * Buck Pasture 9632 12.1 -M * 12.9 -M * EF Blacks Fork GS 9360 10.7 -M * 5.9 -M * Hams Fork 7840 9.3 10.6 88 9.2 10.8 85 Hewinta 9500 9.2 10.4 88 11.0 13.1 84 Hickerson Park 9122 6.5 7.2 90 7.6 9.4 81 Hole-in-Rock 9168 7.5 7.0 107 8.1 8.9 91 Indian Creek 9425 21.1 23.2 91 15.4 21.3 72 Kelley R.S. 8180 13.1 14.7 89 14.2 17.2 83 Spirit Lk 10235 10.5 -M * 11.8 -M * Steel Creek Park 10158 13.4 14.6 92 13.5 15.3 88 ----- ----- Basin Index (%) 91 82 UPPER BEAR RIVER Bear River RS 8777 8.4 -M * 10.3 -M * Bug Lake 7987 14.9 17.9 83 15.6 18.3 85 Burts Miller Ranch 8000 6.1 -M * 6.3 -M * Chalk Creek #1 9171 14.9 22.7 66 15.9 23.6 67 Hayden Fork 9130 13.9 14.8 94 15.7 19.7 80 Kelley R.S. 8180 13.1 14.7 89 14.2 17.2 83 Lily Lake 9133 9.5 11.9 80 11.2 16.0 70 Monte Cristo 8932 21.5 25.6 84 21.0 24.5 86 Salt River Summit 7640 11.1 12.7 87 12.5 15.8 79 ----- ----- Basin Index (%) 82 79 ----------------------------------------------------------------------------- -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.