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 20 , 2019 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 17.9 11.9 150 23.9 21.7 110 Black Bear 8170 -M 36.9 * 48.3 39.8 121 Blind Bull Sum 8650 26.3 24.0 110 20.7 20.2 102 Cottonwood Creek 7670 22.0 18.6 118 28.6 25.8 111 East Rim Divide 7930 9.0 9.5 95 13.0 12.2 107 Grand Targhee 9260 47.6 42.0 113 -M 32.6 * Granite Creek 6770 17.4 10.8 161 22.8 20.3 112 Grassy Lake 7265 35.0 31.3 112 41.3 37.3 111 Gros Ventre Summit 8750 8.9 13.2 67 13.4 13.7 98 Gunsight Pass 9820 14.2 13.6 104 16.9 14.9 113 Lewis Lake Divide 7850 39.5 30.4 130 42.3 36.8 115 Phillips Bench 8200 31.6 25.6 123 34.8 29.2 119 Salt River Summit 7640 14.4 9.7 148 18.4 17.4 106 Snake River Station 6920 17.8 11.3 158 27.4 23.5 117 Spring Creek Divide 9000 24.4 23.5 104 25.4 24.7 103 Thumb Divide 7980 20.0 14.5 138 20.9 19.7 106 Togwotee Pass 9580 25.8 23.8 108 27.1 25.7 105 Two Ocean Plateau 9240 34.1 28.1 121 28.6 28.5 100 Willow Creek 8080 34.9 26.8 130 38.9 35.3 110 Younts Peak 8350 13.8 15.1 91 15.2 16.6 92 ----- ----- Basin Index (%) 118 110 MADISON-GALLATIN Black Bear 8170 -M 36.9 * 48.3 39.8 121 Canyon 7870 14.4 12.2 118 18.0 17.0 106 Madison Plateau 7750 32.5 22.9 142 30.9 27.5 112 West Yellowstone 6700 8.9 7.4 120 18.8 15.1 125 Whiskey Creek 6800 19.4 15.3 127 23.7 21.2 112 ----- ----- Basin Index (%) 130 116 YELLOWSTONE Beartooth Lake 9360 23.5 23.4 100 22.0 20.8 106 Burnt Mtn 5880 5.1 .0 * 15.2 14.2 107 Canyon 7870 14.4 12.2 118 18.0 17.0 106 Cole Creek 7850 17.8 16.3 109 -M 14.5 * Evening Star 9200 28.4 24.8 115 31.6 28.7 110 Fisher Creek 9100 36.6 32.4 113 39.1 33.3 117 Northeast Entrance 7350 8.3 6.7 124 15.8 13.0 122 Parker Peak 9400 26.6 20.9 127 26.5 18.7 142 Sylvan Lake 8420 22.4 20.4 110 29.7 23.6 126 Thumb Divide 7980 20.0 14.5 138 20.9 19.7 106 Two Ocean Plateau 9240 34.1 28.1 121 28.6 28.5 100 White Mill 8700 25.5 23.7 108 23.2 24.9 93 Wolverine 7650 8.5 7.2 118 13.9 12.8 109 Younts Peak 8350 13.8 15.1 91 15.2 16.6 92 ----- ----- Basin Index (%) 116 110 WIND RIVER Burroughs Creek 8750 11.4 -M * 15.2 -M * Castle Creek 8400 1.8 -M * 7.0 -M * Cold Springs 9630 6.6 4.6 143 8.9 10.9 82 Deer Park 9700 17.7 16.3 109 20.3 21.5 94 Hobbs Park 10100 16.8 14.8 114 14.2 14.8 96 Kirwin 9550 10.9 10.0 109 12.2 12.4 98 Little Warm 9370 10.2 10.1 101 10.2 13.9 73 Owl Creek 8975 2.6 4.0 65 7.3 6.9 106 South Pass 9040 15.8 15.5 102 13.9 18.6 75 St. Lawrence Alt 8620 -M 5.3 * -M 9.9 * Togwotee Pass 9580 25.8 23.8 108 27.1 25.7 105 Townsend Creek 8700 10.6 9.4 113 12.9 13.3 97 ----- ----- Basin Index (%) 108 92 BIGHORN BASIN Bald Mtn. 9380 16.0 19.8 81 13.5 18.2 74 Bear Trap Meadow 8200 3.6 3.2 112 7.6 9.4 81 Bone Springs Div 9350 13.3 16.1 83 12.5 16.7 75 Grave Springs 8550 8.4 9.6 88 10.0 11.7 85 Kirwin 9550 10.9 10.0 109 12.2 12.4 98 Marquette 8760 7.6 -M * 10.1 -M * Middle Powder 7760 7.9 12.5 63 9.3 12.8 73 Owl Creek 8975 2.6 4.0 65 7.3 6.9 106 Powder River Pass 9480 9.7 10.2 95 -M 13.7 * Shell Creek 9580 13.8 15.4 90 11.4 14.8 77 Timber Creek 7950 1.8 4.8 38 7.0 8.4 83 ----- ----- Basin Index (%) 83 82 SHOSHONE RIVER Blackwater 9780 26.9 23.8 113 27.2 21.8 125 Evening Star 9200 28.4 24.8 115 31.6 28.7 110 Marquette 8760 7.6 -M * 10.1 -M * Sylvan Lake 8420 22.4 20.4 110 29.7 23.6 126 Sylvan Road 7120 7.6 9.8 78 17.4 17.6 99 Younts Peak 8350 13.8 15.1 91 15.2 16.6 92 ----- ----- Basin Index (%) 106 112 POWDER RIVER Bear Trap Meadow 8200 3.6 3.2 112 7.6 9.4 81 Cloud Peak Reservoir 9860 12.0 15.8 76 11.9 14.9 80 Grave Springs 8550 8.4 9.6 88 10.0 11.7 85 Hansen Sawmill 8360 5.3 4.8 110 8.4 9.5 88 Middle Powder 7760 7.9 12.5 63 9.3 12.8 73 Powder River Pass 9480 9.7 10.2 95 -M 13.7 * Soldier Park 8720 2.9 -M * 7.6 -M * ----- ----- Basin Index (%) 84 81 TONGUE RIVER Big Goose 7990 8.1 9.3 87 10.7 12.6 85 Bone Springs Div 9350 13.3 16.1 83 12.5 16.7 75 Burgess Junction 7880 8.8 12.5 70 9.1 13.4 68 Dome Lake 8880 7.2 11.8 61 9.2 14.9 62 Little Goose 8870 9.2 -M * 8.4 -M * Sucker Creek 8880 10.7 12.7 84 10.5 15.8 66 Tie Creek 6870 3.0 4.4 68 11.3 12.8 88 ----- ----- Basin Index (%) 76 73 BELLE FOURCHE Blind Park 6890 .7 4.1 17 8.1 13.1 62 Cole Canyon 5910 3.6 2.0 180 13.0 10.4 125 ----- ----- Basin Index (%) 70 90 CHEYENNE RIVER BASIN Blind Park 6890 .7 4.1 17 8.1 13.1 62 North Rapid Creek 6130 2.3 4.2 55 7.7 11.0 70 ----- ----- Basin Index (%) 36 66 UPPER N. PLATTE Arapaho Ridge 10960 26.7 21.4 125 27.2 24.3 112 Blackhall Mtn 9820 34.8 -M * 35.4 -M * Columbine 9160 25.9 20.6 126 30.1 26.9 112 Divide Peak 8880 21.2 18.9 112 24.9 22.8 109 Joe Wright 10120 23.2 22.2 105 31.3 27.7 113 Laprele Creek 8375 11.6 8.0 145 15.4 13.7 112 Med Bow 10500 40.6 -M * 36.4 -M * Never Summer 10280 23.1 20.7 112 19.9 -M * North French Creek 10130 31.4 32.0 98 31.6 28.6 110 Old Battle 10000 38.3 32.7 117 38.6 37.0 104 Rawah 9020 10.8 8.4 129 18.2 15.5 117 Sage Creek Basin 7850 15.7 6.0 262 17.0 15.3 111 Sand Lake 10050 31.5 30.5 103 26.0 26.8 97 South Brush Creek 8440 7.8 9.8 80 12.9 16.5 78 Tower 10500 51.7 48.0 108 48.8 42.1 116 Webber Springs 9250 26.4 22.0 120 32.8 28.4 115 Whiskey Park 8950 31.3 25.9 121 34.0 29.6 115 Willow Creek Pass 9540 17.2 13.1 131 18.4 14.4 128 Zirkel 9340 33.4 22.7 147 39.6 29.7 133 ----- ----- Basin Index (%) 118 112 SWEETWATER Deer Park 9700 17.7 16.3 109 20.3 21.5 94 Larsen Creek 9000 9.1 10.3 88 15.4 -M * South Pass 9040 15.8 15.5 102 13.9 18.6 75 ----- ----- Basin Index (%) 101 85 LOWER N. PLATTE Casper Mtn. 7900 14.9 14.4 103 13.6 16.6 82 Laprele Creek 8375 11.6 8.0 145 15.4 13.7 112 Reno Hill 8400 17.2 13.9 124 18.9 17.2 110 Windy Peak 7900 8.6 6.6 130 12.6 11.6 109 ----- ----- Basin Index (%) 122 102 LARAMIE RIVER Brooklyn Lake 10240 25.1 22.2 113 27.2 22.8 119 Cinnabar Park 9574 20.5 20.1 102 24.6 25.3 97 Crow Creek 8330 2.9 .7 414* 11.4 12.0 95 Deadman Hill 10220 23.1 17.0 136 21.1 18.9 112 Rawah 9020 10.8 8.4 129 18.2 15.5 117 Roach 9700 17.0 16.6 102 22.9 20.6 111 Windy Peak 7900 8.6 6.6 130 12.6 11.6 109 ----- ----- Basin Index (%) 118 109 S. PLATTE Black Mountain 8920 12.0 -M * 14.4 -M * Crow Creek 8330 2.9 .7 414* 11.4 12.0 95 Deadman Hill 10220 23.1 17.0 136 21.1 18.9 112 ----- ----- Basin Index (%) 147* 105 LITTLE SNAKE RIVER Battle Mountain 7440 6.8 4.3 158 17.1 16.1 106 Divide Peak 8880 21.2 18.9 112 24.9 22.8 109 Elk River 8700 17.1 15.5 110 20.7 21.3 97 Little Snake River 8915 28.1 24.3 116 39.3 31.2 126 Old Battle 10000 38.3 32.7 117 38.6 37.0 104 Sage Creek Basin 7850 15.7 6.0 262 17.0 15.3 111 Sandstone RS 8150 12.1 10.1 120 19.2 19.5 98 Whiskey Park 8950 31.3 25.9 121 34.0 29.6 115 ----- ----- Basin Index (%) 124 109 UPPER GREEN RIVER Big Sandy Opening 9080 14.3 12.7 113 15.6 14.1 111 Blind Bull Sum 8650 26.3 24.0 110 20.7 20.2 102 East Rim Divide 7930 9.0 9.5 95 13.0 12.2 107 Elkhart Park G.S. 9400 13.8 11.9 116 14.9 14.0 106 Gros Ventre Summit 8750 8.9 13.2 67 13.4 13.7 98 Gunsight Pass 9820 14.2 13.6 104 16.9 14.9 113 Indian Creek 9425 24.9 23.3 107 19.9 23.5 85 Kendall R.S. 7740 9.0 8.4 107 12.5 14.8 84 Loomis Park 8240 15.3 13.0 118 18.4 18.0 102 New Fork Lake 8340 9.5 8.8 108 10.5 11.3 93 Pocket Creek 9360 15.7 -M * 16.3 -M * Snider Basin 8060 9.1 10.7 85 14.3 14.8 97 Spring Creek Divide 9000 24.4 23.5 104 25.4 24.7 103 Triple Peak 8500 24.8 19.3 128 27.5 26.3 105 ----- ----- Basin Index (%) 106 100 LOWER GREEN RIVER Blacks Fork Jct 8869 9.0 -M * 14.6 -M * Buck Pasture 9632 17.1 -M * 21.7 -M * EF Blacks Fork GS 9360 12.4 -M * 13.3 -M * Hams Fork 7840 8.2 6.7 122 12.3 12.0 102 Hewinta 9500 12.2 8.1 151 16.8 15.0 112 Hickerson Park 9122 9.2 5.4 170 13.1 11.0 119 Hole-in-Rock 9168 6.4 5.9 108 12.1 10.5 115 Indian Creek 9425 24.9 23.3 107 19.9 23.5 85 Kelley R.S. 8180 15.3 12.7 120 17.4 18.9 92 Spirit Lk 10235 17.4 -M * 19.0 -M * Steel Creek Park 10158 15.1 16.2 93 21.1 17.7 119 ----- ----- Basin Index (%) 117 104 UPPER BEAR RIVER Bear River RS 8777 9.7 -M * 17.0 -M * Bug Lake 7987 23.7 17.2 138 25.4 20.4 125 Burts Miller Ranch 8000 4.0 -M * 10.0 -M * Chalk Creek #1 9171 28.7 24.6 117 32.5 26.7 122 Hayden Fork 9130 15.8 11.8 134 25.5 22.4 114 Kelley R.S. 8180 15.3 12.7 120 17.4 18.9 92 Lily Lake 9133 14.4 10.6 136 18.2 18.3 99 Monte Cristo 8932 37.4 27.5 136 34.7 27.3 127 Salt River Summit 7640 14.4 9.7 148 18.4 17.4 106 Spring Creek Divide 9000 24.4 23.5 104 25.4 24.7 103 ----- ----- Basin Index (%) 127 112 ----------------------------------------------------------------------------- -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.