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: MAY 7 , 2018 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 9.3 6.1 152 25.7 23.4 110 Black Bear 8170 47.6 37.0 129 46.8 42.6 110 Blind Bull Sum 8650 -M 22.6 * 22.6 21.9 103 Cottonwood Creek 7670 13.9 13.5 103 30.8 28.3 109 East Rim Divide 7930 .0 6.9 0 14.2 13.3 107 Grand Targhee 9260 55.2 46.4 119 39.3 35.7 110 Granite Creek 6770 7.1 6.7 106 24.6 21.9 112 Grassy Lake 7265 25.2 27.0 93 41.1 40.1 102 Gros Ventre Summit 8750 12.1 10.2 119 17.5 15.1 116 Gunsight Pass 9820 15.1 11.7 129 19.5 16.5 118 Lewis Lake Divide 7850 40.9 29.4 139 -M 39.3 * Phillips Bench 8200 27.1 23.6 115 33.0 31.4 105 Salt River Summit 7640 .0 6.2 0 14.9 18.8 79 Snake River Station 6920 4.8 4.0 120 27.4 25.3 108 Spring Creek Divide 9000 25.0 24.1 104 27.8 26.8 104 Thumb Divide 7980 11.7 9.7 121 22.3 21.5 104 Togwotee Pass 9580 33.6 25.0 134 38.5 28.1 137 Two Ocean Plateau 9240 38.4 29.8 129 34.8 30.8 113 Willow Creek 8080 28.0 21.7 129 42.0 38.6 109 Younts Peak 8350 -M 15.6 * -M 18.3 * ----- ----- Basin Index (%) 117 109 MADISON-GALLATIN Black Bear 8170 47.6 37.0 129 46.8 42.6 110 Canyon 7870 13.6 8.2 166 22.0 18.5 119 Madison Plateau 7750 28.0 20.7 135 32.1 29.6 108 West Yellowstone 6700 .1 .0 * 20.2 16.4 123 Whiskey Creek 6800 14.1 11.9 118 23.3 22.8 102 ----- ----- Basin Index (%) 133 111 YELLOWSTONE Beartooth Lake 9360 37.0 22.9 162 39.4 22.7 174 Burnt Mtn 5880 .1 .0 * 18.6 16.6 112 Canyon 7870 13.6 8.2 166 22.0 18.5 119 Cole Creek 7850 15.1 16.9 89 15.4 17.2 90 Evening Star 9200 41.9 25.1 167 48.8 31.3 156 Fisher Creek 9100 56.2 33.4 168 52.4 36.1 145 Northeast Entrance 7350 4.3 1.0 430 20.7 14.3 145 Parker Peak 9400 36.6 21.6 169 33.8 20.7 163 Sylvan Lake 8420 24.6 18.4 134 32.1 25.9 124 Thumb Divide 7980 11.7 9.7 121 22.3 21.5 104 Two Ocean Plateau 9240 38.4 29.8 129 34.8 30.8 113 White Mill 8700 41.3 24.3 170 36.0 27.0 133 Wolverine 7650 13.3 .5 2660* 24.0 14.2 169 ----- ----- Basin Index (%) 158 135 WIND RIVER Burroughs Creek 8750 9.6 -M * 20.8 -M * Castle Creek 8400 .1 -M * 11.8 -M * Cold Springs 9630 .2 1.6 12 11.6 13.1 89 Deer Park 9700 10.8 14.7 73 18.9 24.2 78 Hobbs Park 10100 16.3 15.9 103 17.6 17.4 101 Kirwin 9550 17.7 10.8 164 20.9 14.5 144 Little Warm 9370 12.3 7.1 173 19.6 15.9 123 Owl Creek 8975 .0 .5 0* 8.8 8.4 105 South Pass 9040 8.2 13.1 63 11.3 21.0 54 St. Lawrence Alt 8620 .0 1.5 0 9.6 12.1 79 Togwotee Pass 9580 33.6 25.0 134 38.5 28.1 137 Townsend Creek 8700 .7 5.2 13 12.6 15.5 81 ----- ----- Basin Index (%) 105 100 BIGHORN BASIN Bald Mtn. 9380 22.6 20.4 111 19.9 20.4 98 Bear Trap Meadow 8200 2.0 .2 1000* 12.4 11.3 110 Bone Springs Div 9350 20.2 16.4 123 18.6 19.0 98 Grave Springs 8550 5.3 8.5 62 6.9 13.6 51 Kirwin 9550 17.7 10.8 164 20.9 14.5 144 Marquette 8760 5.7 -M * 13.5 -M * Middle Powder 7760 6.1 11.2 54 7.9 14.8 53 Owl Creek 8975 .0 .5 0* 8.8 8.4 105 Powder River Pass 9480 13.6 9.0 151 18.3 15.8 116 Shell Creek 9580 22.3 16.4 136 19.1 17.0 112 Timber Creek 7950 .0 1.9 0 -M 10.6 * ----- ----- Basin Index (%) 115 99 SHOSHONE RIVER Blackwater 9780 37.0 25.5 145 36.4 24.2 150 Evening Star 9200 41.9 25.1 167 48.8 31.3 156 Marquette 8760 5.7 -M * 13.5 -M * Sylvan Road 7120 .1 2.9 3 25.0 19.0 132 Younts Peak 8350 -M 15.6 * -M 18.3 * ----- ----- Basin Index (%) 148 148 POWDER RIVER Bear Trap Meadow 8200 2.0 .2 1000* 12.4 11.3 110 Cloud Peak Reservoir 9860 15.7 16.5 95 18.4 17.5 105 Grave Springs 8550 5.3 8.5 62 6.9 13.6 51 Hansen Sawmill 8360 4.6 1.5 307 13.4 11.4 118 Middle Powder 7760 6.1 11.2 54 7.9 14.8 53 Powder River Pass 9480 13.6 9.0 151 18.3 15.8 116 Soldier Park 8720 3.2 -M * 13.2 -M * ----- ----- Basin Index (%) 101 92 TONGUE RIVER Big Goose 7990 6.9 10.1 68 12.0 15.1 79 Bone Springs Div 9350 20.2 16.4 123 18.6 19.0 98 Burgess Junction 7880 10.1 11.4 89 11.6 15.5 75 Dome Lake 8880 12.8 11.2 114 16.1 17.2 94 Little Goose 8870 8.1 -M * 15.9 -M * Sucker Creek 8880 8.7 12.1 72 12.9 18.3 70 Tie Creek 6870 .1 2.1 5 12.3 15.1 81 ----- ----- Basin Index (%) 93 83 BELLE FOURCHE Cole Canyon 5910 .0 .0 * 13.0 12.9 101 ----- ----- Basin Index (%) * 101 CHEYENNE RIVER BASIN Blind Park 6890 .0 .0 * 13.7 14.9 92 North Rapid Creek 6130 .0 .0 * 11.2 12.9 87 ----- ----- Basin Index (%) * 90 UPPER N. PLATTE Arapaho Ridge 10960 21.1 22.3 95 25.5 26.9 95 Blackhall Mtn 9820 24.1 -M * 30.7 -M * Columbine 9160 13.1 15.1 87 29.7 29.3 101 Divide Peak 8880 2.9 16.3 18 20.5 25.0 82 Joe Wright 10120 21.7 22.9 95 35.8 30.8 116 Laprele Creek 8375 .1 4.6 2 10.4 15.6 67 Med Bow 10500 43.6 -M * 38.9 -M * North French Creek 10130 27.5 32.8 84 31.9 31.6 101 Never Summer 10280 22.3 22.0 101 20.7 -M * Old Battle 10000 26.6 35.8 74 27.6 40.2 69 Rawah 9020 3.9 3.8 103 18.5 17.8 104 Sage Creek Basin 7850 -M .2 * 11.6 16.6 70 Sand Lake 10050 28.5 31.8 90 27.1 29.9 91 South Brush Creek 8440 .0 6.7 0 14.0 18.5 76 Tower 10500 44.6 51.3 87 42.8 45.9 93 Webber Springs 9250 12.0 20.5 59 24.4 30.6 80 Willow Creek Pass 9540 14.0 14.3 98 17.7 16.2 109 Zirkel 9340 11.9 20.2 59 35.1 31.8 110 ----- ----- Basin Index (%) 78 92 SWEETWATER Deer Park 9700 10.8 14.7 73 18.9 24.2 78 Larsen Creek 9000 .4 7.4 5 13.0 -M * South Pass 9040 8.2 13.1 63 11.3 21.0 54 ----- ----- Basin Index (%) 55 67 LOWER N. PLATTE Casper Mtn. 7900 .5 11.9 4 9.0 18.9 48 Laprele Creek 8375 .1 4.6 2 10.4 15.6 67 Reno Hill 8400 5.8 11.8 49 14.4 19.7 73 Windy Peak 7900 .1 2.0 5 10.7 13.5 79 ----- ----- Basin Index (%) 21 66 LARAMIE RIVER Brooklyn Lake 10240 21.3 22.2 96 29.2 25.5 115 Cinnabar Park 9574 16.2 18.1 90 27.8 27.9 100 Crow Creek 8330 .0 .0 * 13.7 14.1 97 Deadman Hill 10220 20.5 18.9 108 23.8 21.3 112 Rawah 9020 3.9 3.8 103 18.5 17.8 104 Roach 9700 11.5 16.6 69 20.9 23.0 91 ----- ----- Basin Index (%) 92 103 S. PLATTE Black Mountain 8920 5.4 -M * 16.4 -M * Crow Creek 8330 .0 .0 * 13.7 14.1 97 Deadman Hill 10220 20.5 18.9 108 23.8 21.3 112 ----- ----- Basin Index (%) 108* 106 LITTLE SNAKE RIVER Battle Mountain 7440 .0 .0 * 13.3 17.5 76 Divide Peak 8880 2.9 16.3 18 20.5 25.0 82 Elk River 8700 .7 10.1 7 19.2 23.4 82 Little Snake River 8915 12.1 21.0 58 31.2 33.7 93 Old Battle 10000 26.6 35.8 74 27.6 40.2 69 Sage Creek Basin 7850 -M .2 * 11.6 16.6 70 Sandstone RS 8150 .0 3.2 0 12.0 21.3 56 Whiskey Park 8950 19.0 27.1 70 29.1 32.3 90 ----- ----- Basin Index (%) 54 78 UPPER GREEN RIVER Big Sandy Opening 9080 7.6 8.7 87 14.9 15.8 94 Blind Bull Sum 8650 -M 22.6 * 22.6 21.9 103 East Rim Divide 7930 .0 6.9 0 14.2 13.3 107 Elkhart Park G.S. 9400 7.8 10.0 78 13.5 15.6 87 Gros Ventre Summit 8750 12.1 10.2 119 17.5 15.1 116 Gunsight Pass 9820 15.1 11.7 129 19.5 16.5 118 Kendall R.S. 7740 1.7 .7 243* 17.2 15.9 108 Loomis Park 8240 9.5 8.4 113 20.9 19.5 107 New Fork Lake 8340 .7 4.0 18 13.4 12.6 106 Pocket Creek 9360 6.9 -M * 10.7 -M * Snider Basin 8060 .0 7.9 0 16.2 16.0 101 Spring Creek Divide 9000 25.0 24.1 104 27.8 26.8 104 Triple Peak 8500 24.4 15.4 158 35.6 28.7 124 ----- ----- Basin Index (%) 96 107 LOWER GREEN RIVER Blacks Fork Jct 8869 .2 -M * 11.3 -M * Buck Pasture 9632 6.1 -M * 16.7 -M * EF Blacks Fork GS 9360 1.1 -M * 9.0 -M * Hams Fork 7840 .0 .5 0* 11.9 13.5 88 Hewinta 9500 .0 3.4 0 14.1 16.8 84 Hickerson Park 9122 .5 1.8 28 10.5 12.5 84 Hole-in-Rock 9168 .0 1.0 0 11.3 12.0 94 Indian Creek 9425 16.9 21.3 79 18.8 25.6 73 Kelley R.S. 8180 5.0 9.2 54 17.0 20.7 82 Spirit Lk 10235 6.2 -M * 15.1 -M * Steel Creek Park 10158 15.2 17.6 86 17.9 19.8 90 ----- ----- Basin Index (%) 69 84 UPPER BEAR RIVER Bear River RS 8777 .0 -M * 12.0 -M * Bug Lake 7987 5.0 12.8 39 18.7 22.3 84 Burts Miller Ranch 8000 .1 -M * 6.9 -M * Chalk Creek #1 9171 5.4 22.5 24 18.4 29.3 63 Hayden Fork 9130 .1 7.1 1 18.6 24.5 76 Kelley R.S. 8180 5.0 9.2 54 17.0 20.7 82 Lily Lake 9133 .0 7.8 0 13.2 20.2 65 Monte Cristo 8932 15.9 23.3 68 25.4 30.1 84 Salt River Summit 7640 .0 6.2 0 14.9 18.8 79 ----- ----- Basin Index (%) 35 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.