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: APRIL 28 , 2018 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 13.8 10.2 135 24.9 22.4 111 Black Bear 8170 47.5 37.1 128 45.4 41.2 110 Blind Bull Sum 8650 38.0 23.9 159 22.1 20.9 106 Cottonwood Creek 7670 18.6 16.4 113 30.2 26.9 112 East Rim Divide 7930 4.7 8.6 55 13.5 12.6 107 Grand Targhee 9260 54.6 43.8 125 37.8 33.9 112 Granite Creek 6770 12.3 8.8 140 24.1 20.9 115 Grassy Lake 7265 30.0 29.9 100 40.0 38.7 103 Gros Ventre Summit 8750 15.2 12.0 127 17.1 14.3 120 Gunsight Pass 9820 17.4 13.2 132 18.9 15.7 120 Lewis Lake Divide 7850 43.6 30.5 143 44.2 38.0 116 Phillips Bench 8200 30.2 25.6 118 32.2 30.2 107 Salt River Summit 7640 4.1 8.2 50 14.3 18.1 79 Snake River Station 6920 11.8 8.9 133 26.3 24.3 108 Spring Creek Divide 9000 28.5 24.1 118 27.3 25.8 106 Thumb Divide 7980 16.6 13.7 121 21.5 20.6 104 Togwotee Pass 9580 35.2 24.7 143 37.4 26.8 140 Two Ocean Plateau 9240 43.5 29.4 148 34.0 29.6 115 Willow Creek 8080 33.8 24.5 138 40.9 36.9 111 Younts Peak 8350 -M 15.2 * -M 17.3 * ----- ----- Basin Index (%) 127 111 MADISON-GALLATIN Black Bear 8170 47.5 37.1 128 45.4 41.2 110 Canyon 7870 17.1 11.3 151 21.6 17.7 122 Madison Plateau 7750 29.5 22.1 133 30.4 28.4 107 West Yellowstone 6700 5.9 3.7 159 19.3 15.6 124 Whiskey Creek 6800 15.6 15.2 103 22.5 22.0 102 ----- ----- Basin Index (%) 129 111 YELLOWSTONE Beartooth Lake 9360 42.0 23.2 181 39.0 21.6 181 Burnt Mtn 5880 4.2 .0 * 17.5 15.2 115 Canyon 7870 17.1 11.3 151 21.6 17.7 122 Cole Creek 7850 16.4 16.3 101 14.4 15.8 91 Evening Star 9200 44.6 24.8 180 -M 29.9 * Fisher Creek 9100 57.5 33.1 174 51.9 34.6 150 Northeast Entrance 7350 10.5 4.4 239 20.3 13.5 150 Parker Peak 9400 39.6 21.7 182 33.4 19.6 170 Sylvan Lake 8420 25.8 20.3 127 31.4 24.6 128 Thumb Divide 7980 16.6 13.7 121 21.5 20.6 104 Two Ocean Plateau 9240 43.5 29.4 148 34.0 29.6 115 White Mill 8700 44.8 23.8 188 35.8 25.8 139 Wolverine 7650 19.7 4.2 469 23.6 13.5 175 ----- ----- Basin Index (%) 169 137 WIND RIVER Burroughs Creek 8750 13.5 -M * 19.9 -M * Castle Creek 8400 2.2 -M * 11.0 -M * Cold Springs 9630 5.1 2.0 255 11.0 12.0 92 Deer Park 9700 10.9 16.3 67 16.7 23.0 73 Hobbs Park 10100 17.4 15.8 110 16.7 16.3 102 Kirwin 9550 19.5 10.3 189 20.2 13.4 151 Little Warm 9370 15.6 9.1 171 19.3 14.8 130 Owl Creek 8975 .0 1.7 0 7.5 7.6 99 South Pass 9040 9.8 15.1 65 -M 20.0 * St. Lawrence Alt 8620 .0 3.8 0 9.0 11.2 80 Togwotee Pass 9580 35.2 24.7 143 37.4 26.8 140 Townsend Creek 8700 3.6 8.2 44 10.6 14.6 73 ----- ----- Basin Index (%) 109 106 BIGHORN BASIN Bald Mtn. 9380 -M 20.5 * 18.9 19.2 98 Bear Trap Meadow 8200 7.1 1.5 473 12.0 10.2 118 Bone Springs Div 9350 22.4 16.5 136 17.7 17.7 100 Grave Springs 8550 7.5 9.2 82 -M 12.4 * Kirwin 9550 19.5 10.3 189 20.2 13.4 151 Marquette 8760 6.2 -M * 11.7 -M * Middle Powder 7760 10.3 12.1 85 -M 13.8 * Owl Creek 8975 .0 1.7 0 7.5 7.6 99 Powder River Pass 9480 15.6 9.8 159 17.6 14.6 121 Shell Creek 9580 23.2 16.0 145 18.3 15.8 116 Timber Creek 7950 .0 3.5 0 -M 9.5 * ----- ----- Basin Index (%) 131 114 SHOSHONE RIVER Blackwater 9780 37.5 24.9 151 35.7 22.9 156 Evening Star 9200 44.6 24.8 180 -M 29.9 * Marquette 8760 6.2 -M * 11.7 -M * Sylvan Road 7120 8.8 7.1 124 24.9 18.2 137 Younts Peak 8350 -M 15.2 * -M 17.3 * ----- ----- Basin Index (%) 160 147* POWDER RIVER Bear Trap Meadow 8200 7.1 1.5 473 12.0 10.2 118 Cloud Peak Reservoir 9860 17.2 16.5 104 16.9 16.1 105 Grave Springs 8550 7.5 9.2 82 -M 12.4 * Hansen Sawmill 8360 7.1 3.6 197 12.1 10.5 115 Middle Powder 7760 10.3 12.1 85 -M 13.8 * Powder River Pass 9480 15.6 9.8 159 17.6 14.6 121 Soldier Park 8720 5.5 -M * 11.7 -M * ----- ----- Basin Index (%) 123 114 TONGUE RIVER Big Goose 7990 8.6 9.1 95 11.1 13.6 82 Bone Springs Div 9350 22.4 16.5 136 17.7 17.7 100 Burgess Junction 7880 11.6 12.2 95 10.8 14.4 75 Dome Lake 8880 14.3 11.7 122 14.9 16.0 93 Little Goose 8870 10.1 -M * 14.9 -M * Sucker Creek 8880 11.4 12.5 91 11.9 16.9 70 Tie Creek 6870 2.7 2.8 96 11.4 13.8 83 ----- ----- Basin Index (%) 110 84 BELLE FOURCHE Cole Canyon 5910 4.0 .3 1333* 12.6 11.4 111 ----- ----- Basin Index (%) 1333* 111 CHEYENNE RIVER BASIN Blind Park 6890 3.6 2.3 157 13.5 13.9 97 North Rapid Creek 6130 2.2 2.3 96 10.8 11.9 91 ----- ----- Basin Index (%) 126 94 UPPER N. PLATTE Arapaho Ridge 10960 23.4 22.3 105 23.9 25.8 93 Blackhall Mtn 9820 27.4 -M * 30.0 -M * Columbine 9160 20.1 19.5 103 28.8 28.1 102 Divide Peak 8880 10.0 18.0 56 20.3 23.9 85 Joe Wright 10120 22.5 23.5 96 33.9 29.3 116 Laprele Creek 8375 2.1 6.9 30 9.9 14.7 67 Med Bow 10500 44.9 -M * 37.9 -M * North French Creek 10130 30.0 33.0 91 31.1 30.2 103 Never Summer 10280 21.9 21.5 102 18.8 -M * Old Battle 10000 27.0 34.6 78 26.8 38.6 69 Rawah 9020 7.3 7.4 99 17.2 17.0 101 Sage Creek Basin 7850 -M 1.4 * 11.3 15.9 71 Sand Lake 10050 29.6 31.2 95 26.2 28.5 92 South Brush Creek 8440 3.4 9.9 34 13.5 17.5 77 Tower 10500 45.3 49.8 91 -M 44.1 * Webber Springs 9250 15.5 22.0 70 23.7 29.5 80 Willow Creek Pass 9540 14.3 13.8 104 16.2 15.4 105 Zirkel 9340 20.5 21.6 95 34.5 30.5 113 ----- ----- Basin Index (%) 87 92 SWEETWATER Deer Park 9700 10.9 16.3 67 16.7 23.0 73 Larsen Creek 9000 4.7 9.5 49 12.1 -M * South Pass 9040 9.8 15.1 65 -M 20.0 * ----- ----- Basin Index (%) 62 73* LOWER N. PLATTE Casper Mtn. 7900 6.8 14.1 48 8.2 17.6 47 Laprele Creek 8375 2.1 6.9 30 9.9 14.7 67 Reno Hill 8400 9.9 13.4 74 13.8 18.4 75 Windy Peak 7900 3.2 5.1 63 10.2 12.7 80 ----- ----- Basin Index (%) 56 66 LARAMIE RIVER Brooklyn Lake 10240 25.4 23.1 110 28.4 24.2 117 Cinnabar Park 9574 20.2 20.0 101 27.2 26.6 102 Crow Creek 8330 .0 .0 * 12.4 13.1 95 Deadman Hill 10220 22.2 18.6 119 22.1 20.2 109 Rawah 9020 7.3 7.4 99 17.2 17.0 101 Roach 9700 13.0 17.1 76 19.2 21.9 88 ----- ----- Basin Index (%) 102 103 S. PLATTE Black Mountain 8920 8.4 -M * 14.9 -M * Crow Creek 8330 .0 .0 * 12.4 13.1 95 Deadman Hill 10220 22.2 18.6 119 22.1 20.2 109 ----- ----- Basin Index (%) 119* 104 LITTLE SNAKE RIVER Battle Mountain 7440 .0 .6 0* 12.6 16.9 75 Divide Peak 8880 10.0 18.0 56 20.3 23.9 85 Elk River 8700 8.2 14.1 58 18.7 22.3 84 Little Snake River 8915 16.8 22.9 73 30.5 32.1 95 Old Battle 10000 27.0 34.6 78 26.8 38.6 69 Sage Creek Basin 7850 -M 1.4 * 11.3 15.9 71 Sandstone RS 8150 .5 7.2 7 11.1 20.4 54 Whiskey Park 8950 21.9 25.9 85 28.6 30.9 93 ----- ----- Basin Index (%) 68 80 UPPER GREEN RIVER Big Sandy Opening 9080 10.9 11.6 94 14.1 14.9 95 Blind Bull Sum 8650 38.0 23.9 159 22.1 20.9 106 East Rim Divide 7930 4.7 8.6 55 13.5 12.6 107 Elkhart Park G.S. 9400 11.2 11.7 96 13.2 14.7 90 Gros Ventre Summit 8750 15.2 12.0 127 17.1 14.3 120 Gunsight Pass 9820 17.4 13.2 132 18.9 15.7 120 Kendall R.S. 7740 7.4 5.6 132 16.8 15.2 111 Loomis Park 8240 13.5 11.4 118 20.3 18.6 109 New Fork Lake 8340 5.3 6.9 77 12.6 11.8 107 Pocket Creek 9360 8.8 -M * 10.1 -M * Snider Basin 8060 3.7 9.9 37 16.0 15.3 105 Spring Creek Divide 9000 28.5 24.1 118 27.3 25.8 106 Triple Peak 8500 30.7 18.5 166 35.2 27.4 128 ----- ----- Basin Index (%) 118 110 LOWER GREEN RIVER Blacks Fork Jct 8869 .2 -M * 10.5 -M * Buck Pasture 9632 8.3 -M * 15.5 -M * EF Blacks Fork GS 9360 4.1 -M * -M -M * Hams Fork 7840 .5 4.1 12 11.6 12.8 91 Hewinta 9500 .8 5.7 14 12.9 15.8 82 Hickerson Park 9122 .3 4.9 6 9.1 11.8 77 Hole-in-Rock 9168 .8 3.8 21 9.8 11.2 88 Indian Creek 9425 21.0 23.7 89 18.3 24.6 74 Kelley R.S. 8180 9.1 11.8 77 16.2 19.8 82 Spirit Lk 10235 7.9 -M * 13.6 -M * Steel Creek Park 10158 14.0 16.8 83 16.3 18.7 87 ----- ----- Basin Index (%) 66 82 UPPER BEAR RIVER Bear River RS 8777 .0 -M * 11.6 -M * Bug Lake 7987 10.0 15.9 63 18.1 21.3 85 Burts Miller Ranch 8000 .4 -M * 6.7 -M * Chalk Creek #1 9171 10.0 24.6 41 17.9 27.9 64 Hayden Fork 9130 .9 9.9 9 18.0 23.3 77 Kelley R.S. 8180 9.1 11.8 77 16.2 19.8 82 Lily Lake 9133 4.4 9.8 45 12.5 19.2 65 Monte Cristo 8932 19.4 27.2 71 24.6 28.7 86 Salt River Summit 7640 4.1 8.2 50 14.3 18.1 79 ----- ----- Basin Index (%) 54 77 ----------------------------------------------------------------------------- -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.