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 WEDNESDAY: MAY 1 , 2019 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 13.6 9.3 146 24.4 22.8 107 Black Bear 8170 42.6 37.4 114 48.8 41.7 117 Blind Bull Sum 8650 24.7 23.1 107 21.3 21.3 100 Cottonwood Creek 7670 19.0 15.3 124 29.4 27.5 107 East Rim Divide 7930 2.2 8.2 27 13.9 12.9 108 Grand Targhee 9260 48.0 44.8 107 37.3 34.6 108 Granite Creek 6770 13.1 8.3 158 23.5 21.3 110 Grassy Lake 7265 -M 29.1 * -M 39.3 * Gros Ventre Summit 8750 6.7 11.6 58 14.5 14.6 99 Gunsight Pass 9820 15.6 12.5 125 18.7 16.0 117 Lewis Lake Divide 7850 35.4 30.1 118 43.1 38.5 112 Phillips Bench 8200 28.9 25.4 114 35.8 30.7 117 Salt River Summit 7640 9.4 7.9 119 18.7 18.4 102 Snake River Station 6920 12.0 7.4 162 28.2 24.7 114 Spring Creek Divide 9000 24.2 24.3 100 26.4 26.2 101 Thumb Divide 7980 15.5 12.4 125 21.6 20.9 103 Togwotee Pass 9580 26.2 24.7 106 28.6 27.2 105 Two Ocean Plateau 9240 34.4 29.7 116 29.5 30.1 98 Willow Creek 8080 29.6 23.0 129 40.1 37.5 107 Younts Peak 8350 -M 15.5 * -M 17.6 * ----- ----- Basin Index (%) 113 108 MADISON-GALLATIN Black Bear 8170 42.6 37.4 114 48.8 41.7 117 Canyon 7870 12.6 10.4 121 18.4 18.0 102 Madison Plateau 7750 28.9 21.3 136 31.4 28.9 109 West Yellowstone 6700 2.7 1.8 150 19.1 16.0 119 Whiskey Creek 6800 16.1 14.6 110 23.9 22.3 107 ----- ----- Basin Index (%) 120 112 YELLOWSTONE Beartooth Lake 9360 24.3 22.8 107 22.7 21.9 104 Burnt Mtn 5880 4.0 .0 * 18.7 15.9 118 Canyon 7870 12.6 10.4 121 18.4 18.0 102 Cole Creek 7850 20.4 16.6 123 -M 16.4 * Evening Star 9200 28.8 24.9 116 33.7 30.4 111 Fisher Creek 9100 36.4 32.7 111 40.6 35.1 116 Northeast Entrance 7350 3.9 3.0 130 16.8 13.8 122 Parker Peak 9400 27.6 21.3 130 27.7 20.0 138 Sylvan Lake 8420 21.0 19.8 106 30.7 25.1 122 Thumb Divide 7980 15.5 12.4 125 21.6 20.9 103 Two Ocean Plateau 9240 34.4 29.7 116 29.5 30.1 98 White Mill 8700 27.6 23.8 116 23.9 26.3 91 Wolverine 7650 4.3 2.5 172 14.6 13.7 107 Younts Peak 8350 -M 15.5 * -M 17.6 * ----- ----- Basin Index (%) 119 110 WIND RIVER Burroughs Creek 8750 9.7 -M * 16.2 -M * Castle Creek 8400 .0 -M * 8.2 -M * Cold Springs 9630 4.9 1.3 377 10.8 12.4 87 Deer Park 9700 16.1 16.0 101 21.4 23.4 91 Hobbs Park 10100 17.4 16.0 109 15.7 16.6 95 Kirwin 9550 10.3 10.4 99 12.8 13.8 93 Little Warm 9370 9.3 8.7 107 10.6 15.3 69 Owl Creek 8975 .5 1.0 50 8.7 7.9 110 South Pass 9040 13.7 14.9 92 14.9 20.3 73 St. Lawrence Alt 8620 -M 2.5 * -M 11.5 * Togwotee Pass 9580 26.2 24.7 106 28.6 27.2 105 Townsend Creek 8700 9.4 7.5 125 14.2 14.9 95 ----- ----- Basin Index (%) 107 91 BIGHORN BASIN Bald Mtn. 9380 17.5 20.5 85 13.9 19.7 71 Bear Trap Meadow 8200 .1 .9 11 7.9 10.6 75 Bone Springs Div 9350 14.4 16.5 87 13.4 18.2 74 Grave Springs 8550 7.4 9.4 79 10.7 12.8 84 Kirwin 9550 10.3 10.4 99 12.8 13.8 93 Marquette 8760 7.4 -M * 11.4 -M * Middle Powder 7760 6.0 11.6 52 10.7 14.1 76 Owl Creek 8975 .5 1.0 50 8.7 7.9 110 Powder River Pass 9480 8.2 9.4 87 -M 15.1 * Shell Creek 9580 14.6 15.9 92 12.0 16.3 74 Timber Creek 7950 .9 3.1 29 8.9 9.9 90 ----- ----- Basin Index (%) 81 80 SHOSHONE RIVER Blackwater 9780 28.5 25.3 113 29.1 23.4 124 Evening Star 9200 28.8 24.9 116 33.7 30.4 111 Marquette 8760 7.4 -M * 11.4 -M * Sylvan Lake 8420 21.0 19.8 106 30.7 25.1 122 Sylvan Road 7120 2.0 5.8 34 18.2 18.6 98 Younts Peak 8350 -M 15.5 * -M 17.6 * ----- ----- Basin Index (%) 106 115 POWDER RIVER Bear Trap Meadow 8200 .1 .9 11 7.9 10.6 75 Cloud Peak Reservoir 9860 12.6 16.5 76 12.4 16.6 75 Grave Springs 8550 7.4 9.4 79 10.7 12.8 84 Hansen Sawmill 8360 3.3 2.5 132 9.4 10.8 87 Middle Powder 7760 6.0 11.6 52 10.7 14.1 76 Powder River Pass 9480 8.2 9.4 87 -M 15.1 * Soldier Park 8720 .6 -M * 8.4 -M * ----- ----- Basin Index (%) 75 79 TONGUE RIVER Big Goose 7990 7.4 9.2 80 12.0 14.0 86 Bone Springs Div 9350 14.4 16.5 87 13.4 18.2 74 Burgess Junction 7880 7.9 12.1 65 9.8 14.8 66 Dome Lake 8880 6.6 11.4 58 10.5 16.4 64 Little Goose 8870 9.3 -M * 9.4 -M * Sucker Creek 8880 10.0 12.2 82 11.5 17.3 66 Tie Creek 6870 1.0 2.7 37 12.9 14.3 90 ----- ----- Basin Index (%) 74 74 BELLE FOURCHE Blind Park 6890 .0 .8 0 8.8 14.3 62 Cole Canyon 5910 .3 .3 100* 14.1 11.8 119 ----- ----- Basin Index (%) 27 88 CHEYENNE RIVER BASIN Blind Park 6890 .0 .8 0 8.8 14.3 62 North Rapid Creek 6130 .0 .8 0 -M 12.2 * ----- ----- Basin Index (%) 0 62 UPPER N. PLATTE Arapaho Ridge 10960 25.3 22.3 113 29.7 26.2 113 Blackhall Mtn 9820 33.6 -M * 38.2 -M * Columbine 9160 17.6 18.2 97 32.3 28.5 113 Divide Peak 8880 15.6 18.0 87 26.6 24.3 109 Joe Wright 10120 22.2 23.3 95 33.9 29.8 114 Laprele Creek 8375 6.9 6.1 113 16.3 15.0 109 Med Bow 10500 42.5 -M * 40.4 -M * Never Summer 10280 25.1 21.8 115 22.3 -M * North French Creek 10130 31.8 32.9 97 34.6 30.7 113 Old Battle 10000 40.8 34.7 118 41.5 39.2 106 Rawah 9020 7.7 6.1 126 20.1 17.2 117 Sage Creek Basin 7850 9.7 1.1 882* 18.9 16.1 117 Sand Lake 10050 -M 31.4 * -M 29.0 * South Brush Creek 8440 2.2 9.2 24 14.6 17.8 82 Tower 10500 53.6 50.0 107 51.3 44.7 115 Webber Springs 9250 24.4 21.7 112 35.3 29.9 118 Whiskey Park 8950 28.9 26.5 109 37.3 31.5 118 Willow Creek Pass 9540 18.0 14.2 127 20.5 15.8 130 Zirkel 9340 27.1 21.0 129 42.4 31.0 137 ----- ----- Basin Index (%) 109 114 SWEETWATER Deer Park 9700 16.1 16.0 101 21.4 23.4 91 Larsen Creek 9000 3.6 9.2 39 16.3 -M * South Pass 9040 13.7 14.9 92 14.9 20.3 73 ----- ----- Basin Index (%) 83 83 LOWER N. PLATTE Casper Mtn. 7900 11.8 13.3 89 14.6 17.9 82 Laprele Creek 8375 6.9 6.1 113 16.3 15.0 109 Reno Hill 8400 15.2 12.6 121 20.2 18.9 107 Windy Peak 7900 4.8 4.0 120 12.8 13.0 98 ----- ----- Basin Index (%) 108 99 LARAMIE RIVER Brooklyn Lake 10240 24.7 23.3 106 30.0 24.7 121 Cinnabar Park 9574 19.7 19.4 102 27.5 26.9 102 Crow Creek 8330 .7 .0 * 13.0 13.4 97 Deadman Hill 10220 22.6 19.0 119 23.2 20.6 113 Rawah 9020 7.7 6.1 126 20.1 17.2 117 Roach 9700 16.1 17.2 94 25.5 22.2 115 Windy Peak 7900 4.8 4.0 120 12.8 13.0 98 ----- ----- Basin Index (%) 108 110 S. PLATTE Black Mountain 8920 9.4 -M * 16.7 -M * Crow Creek 8330 .7 .0 * 13.0 13.4 97 Deadman Hill 10220 22.6 19.0 119 23.2 20.6 113 ----- ----- Basin Index (%) 123* 106 LITTLE SNAKE RIVER Battle Mountain 7440 1.9 .0 * 19.8 17.1 116 Divide Peak 8880 15.6 18.0 87 26.6 24.3 109 Elk River 8700 12.5 13.2 95 22.6 22.7 100 Little Snake River 8915 26.6 22.3 119 42.8 32.7 131 Old Battle 10000 40.8 34.7 118 41.5 39.2 106 Sage Creek Basin 7850 9.7 1.1 882* 18.9 16.1 117 Sandstone RS 8150 8.2 5.9 139 21.6 20.8 104 Whiskey Park 8950 28.9 26.5 109 37.3 31.5 118 ----- ----- Basin Index (%) 118 113 UPPER GREEN RIVER Big Sandy Opening 9080 13.7 10.6 129 17.3 15.1 115 Blind Bull Sum 8650 24.7 23.1 107 21.3 21.3 100 East Rim Divide 7930 2.2 8.2 27 13.9 12.9 108 Elkhart Park G.S. 9400 14.0 11.3 124 16.7 15.0 111 Gros Ventre Summit 8750 6.7 11.6 58 14.5 14.6 99 Gunsight Pass 9820 15.6 12.5 125 18.7 16.0 117 Indian Creek 9425 21.5 23.0 93 20.3 25.0 81 Kendall R.S. 7740 5.3 4.3 123 13.8 15.5 89 Loomis Park 8240 12.5 11.0 114 19.5 18.9 103 New Fork Lake 8340 6.3 6.5 97 11.4 12.1 94 Pocket Creek 9360 14.4 -M * 17.3 -M * Snider Basin 8060 3.7 9.4 39 14.7 15.6 94 Spring Creek Divide 9000 24.2 24.3 100 26.4 26.2 101 Triple Peak 8500 20.7 17.5 118 28.9 27.9 104 ----- ----- Basin Index (%) 99 101 LOWER GREEN RIVER Blacks Fork Jct 8869 4.5 -M * 15.7 -M * Buck Pasture 9632 14.8 -M * 23.7 -M * EF Blacks Fork GS 9360 8.0 -M * 14.8 -M * Hams Fork 7840 2.0 2.9 69 13.9 13.1 106 Hewinta 9500 7.1 4.8 148 18.0 16.1 112 Hickerson Park 9122 4.2 4.2 100 14.0 12.0 117 Hole-in-Rock 9168 2.2 2.5 88 13.4 11.4 118 Indian Creek 9425 21.5 23.0 93 20.3 25.0 81 Kelley R.S. 8180 11.2 11.5 97 18.2 20.2 90 Spirit Lk 10235 14.8 -M * 19.9 -M * Steel Creek Park 10158 17.6 17.1 103 22.7 19.1 119 ----- ----- Basin Index (%) 100 103 UPPER BEAR RIVER Bear River RS 8777 3.6 -M * 17.8 -M * Bug Lake 7987 20.3 15.1 134 27.1 21.7 125 Burts Miller Ranch 8000 -M -M * 10.2 -M * Chalk Creek #1 9171 24.5 24.2 101 33.3 28.4 117 Hayden Fork 9130 10.1 9.3 109 27.0 23.8 113 Kelley R.S. 8180 11.2 11.5 97 18.2 20.2 90 Lily Lake 9133 10.5 9.9 106 19.3 19.5 99 Monte Cristo 8932 33.8 26.5 128 36.0 29.2 123 Salt River Summit 7640 9.4 7.9 119 18.7 18.4 102 Spring Creek Divide 9000 24.2 24.3 100 26.4 26.2 101 ----- ----- Basin Index (%) 112 110 ----------------------------------------------------------------------------- -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.