Wyoming SNOTEL Snow/Precipitation Update Report
Based on Mountain Data from NRCS SNOTEL Sites
**Provisional data, subject to revision**
Data based on the first reading of the day (typically 00:00) for Saturday, May 04, 2024
Basin   Site Name Elev (ft) Snow Water Equivalent Water Year-to-Date Precipitation Current (in) Median (in) Pct of Median Current (in) Median (in) Pct of Median SNAKE RIVER Basin Index (%) 93    98    MADISON HEADWATERS IN WYOMING Basin Index (%) 84    95    YELLOWSTONE HEADWATERS IN WYOMING Basin Index (%) 77    89    WIND RIVER Basin Index (%) 105    110    BIGHORN BASIN Basin Index (%) 98    104    SHOSHONE RIVER Basin Index (%) 89    101    POWDER RIVER Basin Index (%) 69    98    TONGUE RIVER Basin Index (%) 83    95    BELLE FOURCHE Basin Index (%) *   74    CHEYENNE RIVER BASIN Basin Index (%) *   77    UPPER N. PLATTE Basin Index (%) 101    101    SWEETWATER Basin Index (%) 102    107    LOWER N. PLATTE Basin Index (%) 63    91    LARAMIE RIVER Basin Index (%) 108    102    S. PLATTE Basin Index (%) 0*   96    LITTLE SNAKE RIVER Basin Index (%) 103    104    UPPER GREEN RIVER Basin Index (%) 88    98    LOWER GREEN RIVER Basin Index (%) 92    104    UPPER BEAR RIVER Basin Index (%) 103    109

-M  = Missing data.
 *  = Analysis may not provide a valid measure of conditions.
N/A = Not available.

Footnotes for median and average:
(##) = If less than 30 years are available, this value specifies the number of years used for the median and average calculations.
Sites with less than 10 years available do not have medians or averages.

If the Basin Index (%) percent 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 represents the depth of water in the snowpack, if the
snowpack were melted, expressed in inches.


The WATER YEAR-TO-DATE-PRECIPITATION represents total precipitation since October 1st, expressed in inches.

Contact your state water supply staff for assistance.

Medians and averages are calculated for the period 1991-2020.


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 or average for the day is less than 10% of the maximum median or average value for the year.

* Basin - More than half of the stations for a basin with normals report missing or invalid data.

The basin index is calculated as the sum of the valid current values divided by the sum of the corresponding medians or averages and the resulting fraction multiplied by 100.