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 SATURDAY: MARCH 31 , 2018 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 17.1 14.7 116 20.0 20.1 100 Black Bear 8170 40.6 36.0 113 39.8 36.4 109 Blind Bull Sum 8650 31.3 22.2 141 18.9 18.7 101 Cottonwood Creek 7670 21.2 21.1 100 24.4 23.5 104 East Rim Divide 7930 11.8 9.9 119 11.8 11.3 104 Grand Targhee 9260 45.0 36.1 125 28.4 29.1 98 Granite Creek 6770 17.5 14.9 117 20.2 19.0 106 Grassy Lake 7265 31.2 31.5 99 34.2 34.5 99 Gros Ventre Summit 8750 14.7 12.8 115 14.1 12.3 115 Gunsight Pass 9820 15.7 13.3 118 15.2 13.1 116 Lewis Lake Divide 7850 38.1 29.4 130 -M 34.0 * Phillips Bench 8200 27.0 24.0 112 26.8 27.0 99 Salt River Summit 7640 11.1 12.8 87 12.6 15.9 79 Snake River Station 6920 18.6 15.6 119 22.9 21.6 106 Spring Creek Divide 9000 26.0 22.5 116 24.0 22.8 105 Thumb Divide 7980 18.6 14.9 125 18.1 17.7 102 Togwotee Pass 9580 30.6 21.6 142 31.1 23.2 134 Two Ocean Plateau 9240 35.9 25.5 141 28.2 26.1 108 Willow Creek 8080 32.5 27.6 118 33.8 32.0 106 Younts Peak 8350 -M 14.1 * -M 15.1 * ----- ----- Basin Index (%) 119 105 MADISON-GALLATIN Black Bear 8170 40.6 36.0 113 39.8 36.4 109 Canyon 7870 16.6 12.3 135 19.0 15.5 123 Madison Plateau 7750 26.5 21.2 125 26.5 25.1 106 West Yellowstone 6700 13.5 10.2 132 16.8 13.5 124 Whiskey Creek 6800 16.3 14.9 109 19.0 19.3 98 ----- ----- Basin Index (%) 120 110 YELLOWSTONE Beartooth Lake 9360 37.1 20.9 178 33.6 18.8 179 Burnt Mtn 5880 6.8 4.4 155 13.3 12.0 111 Canyon 7870 16.6 12.3 135 19.0 15.5 123 Cole Creek 7850 13.6 13.4 101 -M 11.9 * Evening Star 9200 39.1 23.9 164 41.6 26.0 160 Fisher Creek 9100 50.4 29.9 169 44.2 30.3 146 Northeast Entrance 7350 13.7 9.7 141 17.6 11.6 152 Parker Peak 9400 32.3 18.7 173 28.0 16.8 167 Sylvan Lake 8420 24.3 19.1 127 25.6 21.2 121 Thumb Divide 7980 18.6 14.9 125 18.1 17.7 102 Two Ocean Plateau 9240 35.9 25.5 141 28.2 26.1 108 White Mill 8700 39.3 21.5 183 30.4 22.6 135 Wolverine 7650 20.4 9.0 227 19.9 11.6 172 ----- ----- Basin Index (%) 156 139 WIND RIVER Burroughs Creek 8750 15.6 -M * 17.3 -M * Castle Creek 8400 8.2 -M * 9.5 -M * Cold Springs 9630 9.7 7.1 137 9.7 9.4 103 Deer Park 9700 12.3 14.6 84 15.2 18.5 82 Hobbs Park 10100 16.6 13.2 126 14.4 12.4 116 Kirwin 9550 19.1 9.4 203 17.2 11.0 156 Little Warm 9370 15.2 10.2 149 15.8 12.2 130 Owl Creek 8975 4.5 5.3 85 6.0 5.6 107 South Pass 9040 11.9 14.8 80 8.4 16.5 51 St. Lawrence Alt 8620 3.4 6.7 51 8.4 8.5 99 Togwotee Pass 9580 30.6 21.6 142 31.1 23.2 134 Townsend Creek 8700 7.1 8.9 80 9.1 11.2 81 ----- ----- Basin Index (%) 117 105 BIGHORN BASIN Bald Mtn. 9380 20.5 18.4 111 14.5 16.2 90 Bear Trap Meadow 8200 -M 5.1 * 10.9 8.0 136 Bone Springs Div 9350 18.6 15.6 119 14.3 14.7 97 Grave Springs 8550 7.6 8.8 86 5.5 9.9 56 Kirwin 9550 19.1 9.4 203 17.2 11.0 156 Marquette 8760 5.6 -M * 9.6 -M * Middle Powder 7760 9.6 11.2 86 6.3 11.1 57 Owl Creek 8975 4.5 5.3 85 6.0 5.6 107 Powder River Pass 9480 16.2 9.9 164 15.4 11.9 129 Shell Creek 9580 20.6 14.4 143 15.7 13.1 120 Timber Creek 7950 3.3 4.7 70 -M 6.9 * ----- ----- Basin Index (%) 123 104 SHOSHONE RIVER Blackwater 9780 32.8 22.0 149 30.5 19.5 156 Evening Star 9200 39.1 23.9 164 41.6 26.0 160 Marquette 8760 5.6 -M * 9.6 -M * Sylvan Road 7120 13.4 11.1 121 20.2 16.0 126 Younts Peak 8350 -M 14.1 * -M 15.1 * ----- ----- Basin Index (%) 150 150 POWDER RIVER Bear Trap Meadow 8200 -M 5.1 * 10.9 8.0 136 Cloud Peak Reservoir 9860 15.7 14.0 112 14.2 12.5 114 Grave Springs 8550 7.6 8.8 86 5.5 9.9 56 Hansen Sawmill 8360 8.8 6.3 140 10.3 8.0 129 Middle Powder 7760 9.6 11.2 86 6.3 11.1 57 Powder River Pass 9480 16.2 9.9 164 15.4 11.9 129 Soldier Park 8720 7.5 -M * 10.0 -M * ----- ----- Basin Index (%) 115 102 TONGUE RIVER Big Goose 7990 8.2 8.7 94 8.4 10.5 80 Bone Springs Div 9350 18.6 15.6 119 14.3 14.7 97 Burgess Junction 7880 9.8 11.2 88 8.0 11.6 69 Dome Lake 8880 14.7 11.4 129 11.8 12.8 92 Little Goose 8870 10.0 -M * 12.0 -M * Sucker Creek 8880 10.8 11.4 95 8.3 13.5 61 Tie Creek 6870 4.8 5.4 89 8.8 10.8 81 ----- ----- Basin Index (%) 105 81 BELLE FOURCHE Cole Canyon 5910 7.7 5.8 133 9.8 8.7 113 ----- ----- Basin Index (%) 133 113 CHEYENNE RIVER BASIN Blind Park 6890 7.7 7.2 107 11.0 11.2 98 North Rapid Creek 6130 7.2 6.7 107 8.7 9.2 95 ----- ----- Basin Index (%) 107 97 UPPER N. PLATTE Arapaho Ridge 10960 19.5 19.6 99 19.1 21.1 91 Blackhall Mtn 9820 27.1 -M * 26.1 -M * Columbine 9160 22.0 22.6 97 22.7 24.3 93 Divide Peak 8880 14.0 19.4 72 17.3 20.4 85 Joe Wright 10120 18.6 20.1 93 28.0 24.5 114 Laprele Creek 8375 6.4 9.4 68 7.9 11.7 68 Med Bow 10500 38.8 -M * 30.8 -M * North French Creek 10130 27.0 27.8 97 26.2 25.5 103 Never Summer 10280 18.5 19.4 95 15.2 -M * Old Battle 10000 24.6 29.2 84 23.3 33.4 70 Rawah 9020 11.2 10.3 109 14.6 13.5 108 Sage Creek Basin 7850 8.4 12.6 67 10.1 13.7 74 Sand Lake 10050 25.4 27.3 93 21.6 23.4 92 South Brush Creek 8440 10.4 12.2 85 11.7 14.5 81 Tower 10500 34.4 43.6 79 -M 37.9 * Webber Springs 9250 18.1 22.8 79 20.9 25.4 82 Willow Creek Pass 9540 13.0 11.7 111 13.8 12.7 109 Zirkel 9340 26.8 26.3 102 30.3 27.1 112 ----- ----- Basin Index (%) 89 92 SWEETWATER Deer Park 9700 12.3 14.6 84 15.2 18.5 82 Larsen Creek 9000 11.2 12.1 93 11.2 -M * South Pass 9040 11.9 14.8 80 8.4 16.5 51 ----- ----- Basin Index (%) 85 67 LOWER N. PLATTE Casper Mtn. 7900 7.7 13.2 58 6.7 13.9 48 Laprele Creek 8375 6.4 9.4 68 7.9 11.7 68 Reno Hill 8400 10.0 13.0 77 11.3 14.4 78 Windy Peak 7900 6.4 7.8 82 7.9 10.0 79 ----- ----- Basin Index (%) 70 68 LARAMIE RIVER Brooklyn Lake 10240 23.8 19.7 121 23.9 20.0 120 Cinnabar Park 9574 20.4 19.8 103 23.9 22.9 104 Crow Creek 8330 4.2 6.7 63 10.6 10.1 105 Deadman Hill 10220 19.9 15.4 129 19.0 16.3 117 Rawah 9020 11.2 10.3 109 14.6 13.5 108 Roach 9700 13.4 15.4 87 16.7 18.2 92 ----- ----- Basin Index (%) 106 108 S. PLATTE Black Mountain 8920 10.5 -M * 13.1 -M * Crow Creek 8330 4.2 6.7 63 10.6 10.1 105 Deadman Hill 10220 19.9 15.4 129 19.0 16.3 117 ----- ----- Basin Index (%) 109 112 LITTLE SNAKE RIVER Battle Mountain 7440 6.2 10.7 58 10.4 14.4 72 Divide Peak 8880 14.0 19.4 72 17.3 20.4 85 Elk River 8700 15.3 18.3 84 16.1 19.1 84 Little Snake River 8915 21.0 22.9 92 26.8 28.2 95 Old Battle 10000 24.6 29.2 84 23.3 33.4 70 Sage Creek Basin 7850 8.4 12.6 67 10.1 13.7 74 Sandstone RS 8150 9.1 13.1 69 8.9 17.6 51 Whiskey Park 8950 23.8 25.5 93 24.6 26.7 92 ----- ----- Basin Index (%) 81 79 UPPER GREEN RIVER Big Sandy Opening 9080 13.1 12.3 107 12.8 12.6 102 Blind Bull Sum 8650 31.3 22.2 141 18.9 18.7 101 East Rim Divide 7930 11.8 9.9 119 11.8 11.3 104 Elkhart Park G.S. 9400 12.1 12.0 101 11.6 12.7 91 Gros Ventre Summit 8750 14.7 12.8 115 14.1 12.3 115 Gunsight Pass 9820 15.7 13.3 118 15.2 13.1 116 Kendall R.S. 7740 14.2 11.4 125 14.7 13.7 107 Loomis Park 8240 17.1 14.4 119 17.7 16.6 107 New Fork Lake 8340 11.7 10.3 114 11.0 10.3 107 Pocket Creek 9360 8.5 -M * 8.9 -M * Snider Basin 8060 12.5 12.1 103 14.5 13.6 107 Spring Creek Divide 9000 26.0 22.5 116 24.0 22.8 105 Triple Peak 8500 28.9 21.5 134 29.7 24.3 122 ----- ----- Basin Index (%) 120 108 LOWER GREEN RIVER Blacks Fork Jct 8869 7.7 -M * 8.6 -M * Buck Pasture 9632 12.2 -M * 12.9 -M * EF Blacks Fork GS 9360 10.9 -M * 5.9 -M * Hams Fork 7840 9.2 10.8 85 9.3 10.9 85 Hewinta 9500 9.4 10.8 87 11.1 13.3 83 Hickerson Park 9122 6.9 7.4 93 7.8 9.6 81 Hole-in-Rock 9168 7.7 7.0 110 8.2 9.1 90 Indian Creek 9425 21.1 23.7 89 15.5 21.6 72 Kelley R.S. 8180 13.2 14.8 89 14.2 17.3 82 Spirit Lk 10235 10.6 -M * 11.8 -M * Steel Creek Park 10158 13.4 15.1 89 13.4 15.5 86 ----- ----- Basin Index (%) 90 82 UPPER BEAR RIVER Bear River RS 8777 7.8 -M * 10.3 -M * Bug Lake 7987 14.9 18.0 83 15.7 18.5 85 Burts Miller Ranch 8000 5.4 -M * 6.2 -M * Chalk Creek #1 9171 14.8 23.2 64 15.8 24.0 66 Hayden Fork 9130 13.3 15.0 89 15.7 20.0 78 Kelley R.S. 8180 13.2 14.8 89 14.2 17.3 82 Lily Lake 9133 9.7 12.0 81 11.1 16.2 69 Monte Cristo 8932 21.5 26.0 83 21.1 24.8 85 Salt River Summit 7640 11.1 12.8 87 12.6 15.9 79 ----- ----- Basin Index (%) 81 78 ----------------------------------------------------------------------------- -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.