Wyoming – NRCS

Report #22                                   Weekly Snow Report                             May 12, 2025

 

Good day to all. This is the 22^nd Snow Report for Water Year 2025 (2024-2025 snow season). Currently the state’s SNOTELs are reading 66% of median with a basin high of 83% and a basin low of 36%. Last year the state was at 106%, and at 111% in 2023. The map may differ slightly from the table depending upon how many stations were reporting at the time. This report and a map displaying basin SWE percentages of median for the state may be found at: http://www.wrds.uwyo.edu/wrds/nrcs/nrcs.html.

 

For information on the use of median vs. average go to http://www.wcc.nrcs.usda.gov/normals/median_average.htm

 

SNOW WATER EQUIVALENT AS PERCENT OF MEDIAN. The following table shows the percent of median for today, the 2 previous weeks, one year ago, and two years ago for Wyoming basins. Normal (median) is based on all reporting SNOTEL sites in the basin with calculated medians (newer SNOTEL sites do not have medians figured), but does not include manually measured snow courses. The statewide SNOTEL percent of median is calculated by averaging medians for all stations associated with Wyoming basins. The weighted state average is figured using the area of basins (square miles). The reference period for computing medians is the 30-year period 1991 through 2020.

Basin	5/12/2025	5/5/2025	4/28/2025	5/12/2024	5/12/2023
Snake	75	90	97	100	115
Madison	60	73	82	82	128
Yellowstone	76	94	97	83	96
Wind	74	93	100	124	103
Bighorn	70	95	88	113	68
Shoshone	65	86	89	94	80
Powder	47	67	56	95	64
Tongue	83	109	97	103	70
Belle Fourche	*	*	*	*	*
Cheyenne	*	*	*	*	*
Upper North Platte	63	74	81	111	109
Sweetwater	74	91	90	131	153
Lower North Platte	36	50	59	160	91
Laramie	54	59	72	128	87
South Platte	*	*	*	*	*
Little Snake	51	64	73	116	144
Upper Green	80	93	103	99	115
Lower Green	57	67	75	123	149
Upper Bear	48	68	82	123	171
Statewide SNOTEL Percent of Median	66	81	86	106	111
Weighted State Average (Area)	53	67	70	100	88
Minimum	36	50	56	82	64
Maximum	83	109	103	160	171

 

red = down       blue = up      green = same       * Basin SWE values, close to dates of first measurable                                                                                                                      snowfall and melt-out, can be irregular or erratic

 

For more info contact:

 

Jeff Coyle Jeffrey.Coyle@usda.gov

(307) 233-6787

NRCS Snow Survey

100 East B St., Room 3124

Casper, WY 82601