Wyoming – NRCS

Report #24                                   Weekly Snow Report                  May 22, 2023

 

Good day to all. This is the 24th & last Snow Report for Water Year 2023 (2022-2023 snow season). Currently the state’s SNOTELs are reading 90% of median with a basin high of 180% and a basin low of 33%. Last year the state was at 101%, and at 69% in 2021. 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: https://www.nrcs.usda.gov/wps/portal/wcc/home/snowClimateMonitoring/30YearNormals

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 a percent of median using all SNOTEL sites in Wyoming with calculated medians. 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	5/22/2023	5/15/2023	5/8/2023	5/22/2022	5/22/2021
Snake	93	113	117	100	50
Madison	136	133	131	96	40
Yellowstone	80	92	100	113	69
Wind	89	110	110	125	87
Bighorn	46	67	76	123	99
Shoshone	61	79	84	113	63
Powder	55*	59	81	144*	130*
Tongue	33	72	82	152	169
Belle Fourche	*	*	*	*	*
Cheyenne	*	*	*	*	*
Upper North Platte	104	114	119	80	74
Sweetwater	155	152	185	100	82
Lower North Platte	44	79	109	166	114
Laramie	78*	98*	106	56	101
South Platte	*	*	*	*	*
Little Snake	120	141	158	74	59
Upper Green	94	106	124	109	53
Lower Green	141*	153*	174	79*	47*
Upper Bear	180*	178	196	66*	27*
Statewide SNOTEL Percent of Median	90	107	117	101	69
Weighted State Average (Area)	85	102	116	112	84
Minimum	33	59	76	56	40
Maximum	180	178	196	166	169

 

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 Goats jeff.goats@usda.gov (307) 233-6768

  NRCS Snow Survey

100 East B St., Room 3001

Casper, WY 82601