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 TUESDAY: MARCH 27 , 2018 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 17.9 14.7 122 19.8 19.7 101 Black Bear 8170 -M 34.6 * 39.6 35.6 111 Blind Bull Sum 8650 31.2 21.3 146 18.7 18.3 102 Cottonwood Creek 7670 21.0 20.6 102 24.0 23.0 104 East Rim Divide 7930 11.6 9.8 118 11.5 11.0 105 Grand Targhee 9260 44.8 34.6 129 28.2 28.3 100 Granite Creek 6770 17.3 14.8 117 20.1 18.7 107 Grassy Lake 7265 30.9 30.8 100 33.8 33.9 100 Gros Ventre Summit 8750 14.4 12.2 118 13.9 11.9 117 Gunsight Pass 9820 15.5 12.9 120 15.0 12.7 118 Lewis Lake Divide 7850 37.3 29.0 129 -M 33.2 * Phillips Bench 8200 26.4 23.4 113 26.4 26.4 100 Salt River Summit 7640 10.9 12.5 87 12.3 15.6 79 Snake River Station 6920 18.3 15.8 116 22.6 21.1 107 Spring Creek Divide 9000 25.7 22.2 116 23.6 22.3 106 Thumb Divide 7980 18.3 15.1 121 -M 17.2 * Togwotee Pass 9580 30.3 21.3 142 30.5 22.6 135 Two Ocean Plateau 9240 35.7 25.0 143 28.1 25.4 111 Willow Creek 8080 32.3 26.2 123 33.5 31.2 107 Younts Peak 8350 -M 13.8 * -M 14.7 * ----- ----- Basin Index (%) 121 106 MADISON-GALLATIN Black Bear 8170 -M 34.6 * 39.6 35.6 111 Canyon 7870 16.5 12.1 136 18.8 15.0 125 Madison Plateau 7750 26.9 20.8 129 26.4 24.5 108 West Yellowstone 6700 13.4 10.1 133 16.8 13.1 128 Whiskey Creek 6800 16.3 14.6 112 18.8 18.8 100 ----- ----- Basin Index (%) 127 113 YELLOWSTONE Beartooth Lake 9360 36.5 20.4 179 33.0 18.4 179 Burnt Mtn 5880 6.7 4.7 143 13.0 11.4 114 Canyon 7870 16.5 12.1 136 18.8 15.0 125 Cole Creek 7850 13.0 12.8 102 -M 11.4 * Evening Star 9200 37.8 23.5 161 40.9 25.4 161 Fisher Creek 9100 49.6 28.9 172 43.9 29.6 148 Northeast Entrance 7350 13.5 9.7 139 17.2 11.4 151 Parker Peak 9400 31.2 18.3 170 27.3 16.3 167 Sylvan Lake 8420 24.2 18.8 129 25.4 20.7 123 Thumb Divide 7980 18.3 15.1 121 -M 17.2 * Two Ocean Plateau 9240 35.7 25.0 143 28.1 25.4 111 White Mill 8700 38.7 21.1 183 29.9 22.0 136 Wolverine 7650 19.9 8.9 224 19.3 11.3 171 ----- ----- Basin Index (%) 156 143 WIND RIVER Burroughs Creek 8750 15.7 -M * 16.8 -M * Castle Creek 8400 7.9 -M * 9.2 -M * Cold Springs 9630 9.5 6.9 138 9.3 9.0 103 Deer Park 9700 12.1 14.2 85 14.7 17.9 82 Hobbs Park 10100 16.4 12.8 128 14.0 11.8 119 Kirwin 9550 18.8 8.9 211 16.9 10.5 161 Little Warm 9370 15.0 9.9 152 15.6 11.8 132 Owl Creek 8975 4.0 4.8 83 5.8 5.4 107 South Pass 9040 11.4 14.4 79 -M 16.0 * St. Lawrence Alt 8620 3.0 6.6 45 8.2 8.0 102 Togwotee Pass 9580 30.3 21.3 142 30.5 22.6 135 Townsend Creek 8700 6.6 8.7 76 8.3 10.6 78 ----- ----- Basin Index (%) 117 115 BIGHORN BASIN Bald Mtn. 9380 19.6 17.3 113 13.9 15.5 90 Bear Trap Meadow 8200 -M 5.1 * 10.2 7.6 134 Bone Springs Div 9350 17.8 14.7 121 13.6 14.1 96 Grave Springs 8550 6.6 8.4 79 -M 9.4 * Kirwin 9550 18.8 8.9 211 16.9 10.5 161 Marquette 8760 5.4 -M * 9.2 -M * Middle Powder 7760 8.6 10.6 81 -M 10.6 * Owl Creek 8975 4.0 4.8 83 5.8 5.4 107 Powder River Pass 9480 15.8 9.6 165 14.8 11.4 130 Shell Creek 9580 19.8 13.7 145 15.0 12.5 120 Timber Creek 7950 3.3 4.3 77 -M 6.5 * ----- ----- Basin Index (%) 124 117 SHOSHONE RIVER Blackwater 9780 32.3 21.4 151 30.1 18.9 159 Evening Star 9200 37.8 23.5 161 40.9 25.4 161 Marquette 8760 5.4 -M * 9.2 -M * Sylvan Road 7120 13.8 10.9 127 20.2 15.7 129 Younts Peak 8350 -M 13.8 * -M 14.7 * ----- ----- Basin Index (%) 150 152 POWDER RIVER Bear Trap Meadow 8200 -M 5.1 * 10.2 7.6 134 Cloud Peak Reservoir 9860 14.6 13.5 108 13.0 11.9 109 Grave Springs 8550 6.6 8.4 79 -M 9.4 * Hansen Sawmill 8360 8.2 6.1 134 9.5 7.7 123 Middle Powder 7760 8.6 10.6 81 -M 10.6 * Powder River Pass 9480 15.8 9.6 165 14.8 11.4 130 Soldier Park 8720 6.5 -M * 9.2 -M * ----- ----- Basin Index (%) 112 123 TONGUE RIVER Big Goose 7990 7.4 8.3 89 7.6 9.8 78 Bone Springs Div 9350 17.8 14.7 121 13.6 14.1 96 Burgess Junction 7880 8.8 10.5 84 7.2 11.1 65 Dome Lake 8880 13.9 11.0 126 11.1 12.2 91 Little Goose 8870 9.1 -M * 11.0 -M * Sucker Creek 8880 9.8 11.1 88 7.4 12.9 57 Tie Creek 6870 4.0 5.3 75 8.0 10.2 78 ----- ----- Basin Index (%) 101 78 BELLE FOURCHE Cole Canyon 5910 7.0 5.7 123 9.3 8.3 112 ----- ----- Basin Index (%) 123 112 CHEYENNE RIVER BASIN Blind Park 6890 7.2 7.1 101 10.4 10.8 96 North Rapid Creek 6130 6.9 6.7 103 8.1 8.9 91 ----- ----- Basin Index (%) 102 94 UPPER N. PLATTE Arapaho Ridge 10960 18.7 18.9 99 18.2 20.5 89 Blackhall Mtn 9820 26.2 -M * 25.4 -M * Columbine 9160 21.0 22.0 95 21.4 23.8 90 Divide Peak 8880 13.0 18.8 69 16.7 19.8 84 Joe Wright 10120 17.4 19.7 88 26.9 23.8 113 Laprele Creek 8375 6.0 9.4 64 7.1 11.4 62 Med Bow 10500 37.8 -M * 30.6 -M * North French Creek 10130 25.7 27.0 95 25.0 24.8 101 Never Summer 10280 17.9 18.7 96 14.7 -M * Old Battle 10000 23.8 28.1 85 22.8 32.5 70 Rawah 9020 10.4 10.0 104 13.9 12.9 108 Sage Creek Basin 7850 8.6 12.2 70 9.8 13.4 73 Sand Lake 10050 24.4 26.1 93 20.7 22.7 91 South Brush Creek 8440 9.4 11.8 80 11.0 14.0 79 Tower 10500 33.1 41.9 79 26.1 37.1 70 Webber Springs 9250 17.8 22.3 80 20.3 24.8 82 Willow Creek Pass 9540 12.6 11.4 111 13.4 12.2 110 Zirkel 9340 26.1 25.9 101 29.5 26.5 111 ----- ----- Basin Index (%) 88 88 SWEETWATER Deer Park 9700 12.1 14.2 85 14.7 17.9 82 Larsen Creek 9000 10.8 11.8 92 11.0 -M * South Pass 9040 11.4 14.4 79 -M 16.0 * ----- ----- Basin Index (%) 85 82* LOWER N. PLATTE Casper Mtn. 7900 7.4 12.8 58 5.8 13.4 43 Laprele Creek 8375 6.0 9.4 64 7.1 11.4 62 Reno Hill 8400 9.0 12.6 71 10.2 13.8 74 Windy Peak 7900 5.8 7.7 75 7.3 9.6 76 ----- ----- Basin Index (%) 66 63 LARAMIE RIVER Brooklyn Lake 10240 23.3 18.7 125 23.1 19.3 120 Cinnabar Park 9574 20.1 19.5 103 23.1 22.4 103 Crow Creek 8330 3.6 6.9 52 10.0 9.7 103 Deadman Hill 10220 19.2 14.8 130 18.4 15.8 116 Rawah 9020 10.4 10.0 104 13.9 12.9 108 Roach 9700 12.7 14.7 86 15.8 17.6 90 ----- ----- Basin Index (%) 106 107 S. PLATTE Black Mountain 8920 9.8 -M * 12.5 -M * Crow Creek 8330 3.6 6.9 52 10.0 9.7 103 Deadman Hill 10220 19.2 14.8 130 18.4 15.8 116 ----- ----- Basin Index (%) 105 111 LITTLE SNAKE RIVER Battle Mountain 7440 6.3 11.0 57 -M 14.0 * Divide Peak 8880 13.0 18.8 69 16.7 19.8 84 Elk River 8700 14.3 17.8 80 15.4 18.6 83 Little Snake River 8915 20.0 21.9 91 26.0 27.5 95 Old Battle 10000 23.8 28.1 85 22.8 32.5 70 Sage Creek Basin 7850 8.6 12.2 70 9.8 13.4 73 Sandstone RS 8150 8.6 13.0 66 8.2 17.2 48 Whiskey Park 8950 22.5 24.8 91 23.8 26.0 92 ----- ----- Basin Index (%) 79 79 UPPER GREEN RIVER Big Sandy Opening 9080 12.9 12.0 108 12.7 12.3 103 Blind Bull Sum 8650 31.2 21.3 146 18.7 18.3 102 East Rim Divide 7930 11.6 9.8 118 11.5 11.0 105 Elkhart Park G.S. 9400 11.8 11.5 103 11.4 12.3 93 Gros Ventre Summit 8750 14.4 12.2 118 13.9 11.9 117 Gunsight Pass 9820 15.5 12.9 120 15.0 12.7 118 Kendall R.S. 7740 14.3 11.3 127 14.5 13.5 107 Loomis Park 8240 16.9 14.3 118 17.4 16.2 107 New Fork Lake 8340 11.5 9.9 116 -M 10.1 * Pocket Creek 9360 8.6 -M * 8.6 -M * Snider Basin 8060 12.6 11.5 110 14.0 13.2 106 Spring Creek Divide 9000 25.7 22.2 116 23.6 22.3 106 Triple Peak 8500 27.9 20.7 135 29.1 23.7 123 ----- ----- Basin Index (%) 122 109 LOWER GREEN RIVER Blacks Fork Jct 8869 7.3 -M * 8.6 -M * Buck Pasture 9632 11.8 -M * 12.7 -M * EF Blacks Fork GS 9360 10.5 -M * 5.8 -M * Hams Fork 7840 9.3 10.6 88 9.1 10.6 86 Hewinta 9500 8.8 10.0 88 10.7 12.9 83 Hickerson Park 9122 6.7 7.0 96 7.4 9.3 80 Hole-in-Rock 9168 7.1 6.9 103 8.0 8.7 92 Indian Creek 9425 20.7 22.7 91 15.1 21.0 72 Kelley R.S. 8180 12.9 14.4 90 14.1 17.0 83 Spirit Lk 10235 10.4 -M * 11.6 -M * Steel Creek Park 10158 13.3 14.2 94 13.2 15.0 88 ----- ----- Basin Index (%) 92 82 UPPER BEAR RIVER Bear River RS 8777 7.9 -M * 10.3 -M * Bug Lake 7987 14.7 17.6 84 15.5 18.1 86 Burts Miller Ranch 8000 5.6 -M * 6.2 -M * Chalk Creek #1 9171 14.7 22.4 66 15.8 23.2 68 Hayden Fork 9130 13.3 14.6 91 15.6 19.4 80 Kelley R.S. 8180 12.9 14.4 90 14.1 17.0 83 Lily Lake 9133 9.1 11.8 77 11.1 15.7 71 Monte Cristo 8932 21.4 25.3 85 20.9 24.2 86 Salt River Summit 7640 10.9 12.5 87 12.3 15.6 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.