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 SUNDAY: MAY 20 , 2018 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 .0 .0 * 26.7 24.5 109 Black Bear 8170 42.9 33.8 127 48.1 44.6 108 Blind Bull Sum 8650 -M 19.9 * 25.2 23.2 109 Cottonwood Creek 7670 3.6 6.3 57 32.3 30.0 108 East Rim Divide 7930 .0 .5 0* 16.2 14.1 115 Grand Targhee 9260 46.5 42.3 110 41.0 36.8 111 Granite Creek 6770 .1 .0 * 27.4 22.9 120 Grassy Lake 7265 12.9 17.4 74 42.0 41.8 100 Gros Ventre Summit 8750 5.6 5.6 100 18.8 16.1 117 Gunsight Pass 9820 13.4 10.4 129 21.6 17.7 122 Lewis Lake Divide 7850 26.7 22.4 119 45.6 41.0 111 Phillips Bench 8200 20.1 19.2 105 34.3 32.8 105 Salt River Summit 7640 .0 .0 * 16.1 19.9 81 Snake River Station 6920 .0 .0 * 27.8 26.5 105 Spring Creek Divide 9000 21.0 20.3 103 30.1 28.0 108 Thumb Divide 7980 .0 1.4 0* 22.6 22.8 99 Togwotee Pass 9580 29.8 23.0 130 39.8 29.7 134 Two Ocean Plateau 9240 35.1 28.3 124 35.3 32.8 108 Willow Creek 8080 14.2 16.6 86 44.3 40.8 109 Younts Peak 8350 -M 11.8 * -M 19.5 * ----- ----- Basin Index (%) 110 109 MADISON-GALLATIN Black Bear 8170 42.9 33.8 127 48.1 44.6 108 Canyon 7870 5.0 2.2 227 22.5 19.9 113 Madison Plateau 7750 18.9 14.3 132 33.6 31.5 107 West Yellowstone 6700 .0 .0 * 21.4 17.5 122 Whiskey Creek 6800 6.8 5.6 121 24.2 24.3 100 ----- ----- Basin Index (%) 132 109 YELLOWSTONE Beartooth Lake 9360 37.8 21.6 175 39.7 24.1 165 Burnt Mtn 5880 .2 .0 * 21.2 19.1 111 Canyon 7870 5.0 2.2 227 22.5 19.9 113 Cole Creek 7850 11.5 16.2 71 19.3 19.5 99 Evening Star 9200 35.1 23.7 148 49.8 33.3 150 Fisher Creek 9100 54.7 32.8 167 52.9 38.3 138 Northeast Entrance 7350 .1 .0 * 21.3 15.5 137 Parker Peak 9400 27.0 19.8 136 34.2 22.4 153 Sylvan Lake 8420 12.0 15.1 79 32.7 27.6 118 Thumb Divide 7980 .0 1.4 0* 22.6 22.8 99 Two Ocean Plateau 9240 35.1 28.3 124 35.3 32.8 108 White Mill 8700 37.5 22.3 168 36.2 28.9 125 Wolverine 7650 .0 .0 * 24.1 15.5 155 ----- ----- Basin Index (%) 140 129 WIND RIVER Burroughs Creek 8750 .4 -M * 22.2 -M * Castle Creek 8400 .0 -M * 13.7 -M * Cold Springs 9630 .0 .0 * 13.6 14.4 94 Deer Park 9700 7.4 10.5 70 20.7 25.9 80 Hobbs Park 10100 13.6 13.1 104 19.5 19.3 101 Kirwin 9550 12.7 8.4 151 23.0 15.9 145 Little Warm 9370 6.2 2.7 230 20.8 17.4 120 Owl Creek 8975 -M .0 * 11.1 9.6 116 South Pass 9040 1.3 6.8 19 13.1 22.5 58 St. Lawrence Alt 8620 .0 .0 * 11.9 13.5 88 Togwotee Pass 9580 29.8 23.0 130 39.8 29.7 134 Townsend Creek 8700 .0 .0 * 14.2 17.1 83 ----- ----- Basin Index (%) 110 101 BIGHORN BASIN Bald Mtn. 9380 17.4 19.2 91 20.7 22.1 94 Bear Trap Meadow 8200 .0 .0 * 13.0 12.6 103 Bone Springs Div 9350 14.3 14.3 100 19.9 20.8 96 Grave Springs 8550 .0 2.6 0 8.4 15.0 56 Kirwin 9550 12.7 8.4 151 23.0 15.9 145 Marquette 8760 .5 -M * 15.3 -M * Middle Powder 7760 .0 5.3 0 8.9 16.3 55 Owl Creek 8975 -M .0 * 11.1 9.6 116 Powder River Pass 9480 7.6 5.4 141 19.1 17.3 110 Shell Creek 9580 17.2 15.3 112 19.8 18.5 107 Timber Creek 7950 .0 .0 * 6.6 12.2 54 ----- ----- Basin Index (%) 98 94 SHOSHONE RIVER Blackwater 9780 32.0 24.3 132 37.0 26.0 142 Evening Star 9200 35.1 23.7 148 49.8 33.3 150 Marquette 8760 .5 -M * 15.3 -M * Sylvan Road 7120 .1 .0 * 25.3 20.3 125 Younts Peak 8350 -M 11.8 * -M 19.5 * ----- ----- Basin Index (%) 140* 141 POWDER RIVER Bear Trap Meadow 8200 .0 .0 * 13.0 12.6 103 Cloud Peak Reservoir 9860 11.3 14.8 76 20.0 19.6 102 Grave Springs 8550 .0 2.6 0 8.4 15.0 56 Hansen Sawmill 8360 .0 .0 * 14.6 12.9 113 Middle Powder 7760 .0 5.3 0 8.9 16.3 55 Powder River Pass 9480 7.6 5.4 141 19.1 17.3 110 Soldier Park 8720 .2 -M * 13.9 -M * ----- ----- Basin Index (%) 67 90 TONGUE RIVER Big Goose 7990 .0 4.8 0 12.8 17.1 75 Bone Springs Div 9350 14.3 14.3 100 19.9 20.8 96 Burgess Junction 7880 3.4 8.1 42 12.6 17.0 74 Dome Lake 8880 6.2 6.2 100 18.2 19.0 96 Little Goose 8870 1.5 -M * 16.8 -M * Sucker Creek 8880 .1 8.6 1 13.6 20.2 67 Tie Creek 6870 .1 .0 * 13.2 17.3 76 ----- ----- Basin Index (%) 57 81 BELLE FOURCHE Cole Canyon 5910 .0 .0 * 13.4 14.9 90 ----- ----- Basin Index (%) * 90 CHEYENNE RIVER BASIN Blind Park 6890 .0 .0 * 15.0 16.6 90 North Rapid Creek 6130 .0 .0 * 13.4 14.5 92 ----- ----- Basin Index (%) * 91 UPPER N. PLATTE Arapaho Ridge 10960 13.5 18.1 75 25.6 28.5 90 Blackhall Mtn 9820 12.5 -M * 30.8 -M * Columbine 9160 .0 3.0 0 29.7 30.6 97 Divide Peak 8880 .0 5.7 0 20.5 26.5 77 Joe Wright 10120 13.3 21.1 63 35.9 32.8 109 Laprele Creek 8375 .1 .0 * 11.1 16.9 66 Med Bow 10500 32.6 -M * 39.2 -M * North French Creek 10130 19.4 29.6 66 32.1 33.7 95 Never Summer 10280 18.7 20.3 92 21.0 -M * Old Battle 10000 20.2 32.5 62 27.4 42.1 65 Rawah 9020 .2 .4 50* 18.4 18.9 97 Sage Creek Basin 7850 -M .0 * 11.7 17.4 67 Sand Lake 10050 22.4 27.8 81 27.7 31.9 87 South Brush Creek 8440 .0 .0 * 13.8 20.1 69 Tower 10500 30.5 47.7 64 42.8 47.9 89 Webber Springs 9250 .4 12.0 3 24.3 32.1 76 Willow Creek Pass 9540 5.5 9.3 59 17.6 17.3 102 Zirkel 9340 -M 9.7 * 35.2 33.4 105 ----- ----- Basin Index (%) 63 87 SWEETWATER Deer Park 9700 7.4 10.5 70 20.7 25.9 80 Larsen Creek 9000 .0 3.6 0 14.5 -M * South Pass 9040 1.3 6.8 19 13.1 22.5 58 ----- ----- Basin Index (%) 42 70 LOWER N. PLATTE Casper Mtn. 7900 .0 4.5 0 10.0 20.4 49 Laprele Creek 8375 .1 .0 * 11.1 16.9 66 Reno Hill 8400 .1 3.6 3 15.8 21.3 74 Windy Peak 7900 .2 .0 * 13.1 14.9 88 ----- ----- Basin Index (%) 5 68 LARAMIE RIVER Brooklyn Lake 10240 10.5 16.4 64 29.3 27.2 108 Cinnabar Park 9574 6.3 12.3 51 28.1 29.5 95 Crow Creek 8330 .0 .0 * 14.6 15.1 97 Deadman Hill 10220 9.7 16.5 59 24.1 23.0 105 Rawah 9020 .2 .4 50* 18.4 18.9 97 Roach 9700 1.7 11.5 15 20.8 24.7 84 ----- ----- Basin Index (%) 50 98 S. PLATTE Black Mountain 8920 -M -M * 16.7 -M * Crow Creek 8330 .0 .0 * 14.6 15.1 97 Deadman Hill 10220 9.7 16.5 59 24.1 23.0 105 ----- ----- Basin Index (%) 59* 102 LITTLE SNAKE RIVER Battle Mountain 7440 .0 .0 * 13.2 18.6 71 Divide Peak 8880 .0 5.7 0 20.5 26.5 77 Elk River 8700 .0 .0 * 18.9 24.6 77 Little Snake River 8915 .0 13.3 0 31.2 35.2 89 Old Battle 10000 20.2 32.5 62 27.4 42.1 65 Sage Creek Basin 7850 -M .0 * 11.7 17.4 67 Sandstone RS 8150 -M .0 * 11.7 22.5 52 Whiskey Park 8950 3.7 21.9 17 29.3 33.9 86 ----- ----- Basin Index (%) 33 74 UPPER GREEN RIVER Big Sandy Opening 9080 -M 3.1 * 16.4 16.8 98 Blind Bull Sum 8650 -M 19.9 * 25.2 23.2 109 East Rim Divide 7930 .0 .5 0* 16.2 14.1 115 Elkhart Park G.S. 9400 2.9 5.7 51 16.5 16.7 99 Gros Ventre Summit 8750 5.6 5.6 100 18.8 16.1 117 Gunsight Pass 9820 13.4 10.4 129 21.6 17.7 122 Kendall R.S. 7740 .1 .0 * 19.5 16.8 116 Loomis Park 8240 .5 2.6 19 22.6 20.5 110 New Fork Lake 8340 .1 .0 * 15.4 13.5 114 Pocket Creek 9360 -M -M * 12.1 -M * Snider Basin 8060 .0 .4 0* 18.0 16.8 107 Spring Creek Divide 9000 21.0 20.3 103 30.1 28.0 108 Triple Peak 8500 14.0 8.4 167 37.8 30.2 125 ----- ----- Basin Index (%) 107* 112 LOWER GREEN RIVER Blacks Fork Jct 8869 .0 -M * 12.2 -M * Buck Pasture 9632 .0 -M * 18.5 -M * EF Blacks Fork GS 9360 .0 -M * 12.2 -M * Hams Fork 7840 .0 .0 * 13.6 14.4 94 Hewinta 9500 .0 .0 * 15.3 17.7 86 Hickerson Park 9122 .4 .0 * 12.7 13.4 95 Hole-in-Rock 9168 .0 .0 * 13.1 13.0 101 Indian Creek 9425 12.8 18.5 69 20.5 27.0 76 Kelley R.S. 8180 .0 2.8 0 18.4 21.8 84 Spirit Lk 10235 1.3 -M * 17.2 -M * Steel Creek Park 10158 9.5 14.7 65 19.5 21.0 93 ----- ----- Basin Index (%) 63* 88 UPPER BEAR RIVER Bear River RS 8777 .0 -M * 13.6 -M * Bug Lake 7987 .0 4.9 0 20.0 23.5 85 Burts Miller Ranch 8000 .0 -M * 7.7 -M * Chalk Creek #1 9171 .1 15.6 1 20.0 30.8 65 Hayden Fork 9130 .2 .0 * 20.3 25.8 79 Kelley R.S. 8180 .0 2.8 0 18.4 21.8 84 Lily Lake 9133 .0 .0 * 14.6 21.3 69 Monte Cristo 8932 8.2 14.9 55 26.8 31.6 85 Salt River Summit 7640 .0 .0 * 16.1 19.9 81 ----- ----- Basin Index (%) 22* 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.