Summary of Western US 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 Friday, June 07, 2019
State/River Basin Snow Water Equivalent Water Year-to-Date Precipitation # of Sites Percent of Median # of Sites Percent of Median Alaska 29/59 22*   47/59 124    Arizona 21/23 *   19/23 142    California 32/32 708*   32/32 136    Colorado 101/105 677*   104/105 126    Idaho North of Salmon River 31/31 45*   29/31 87    Idaho South of Salmon River 64/65 146*   65/65 113    Montana 87/91 92*   87/91 96    Nevada 29/32 4538*   31/32 146    New Mexico 21/21 *   21/21 125    Oregon 78/81 63*   77/81 97    Utah 89/90 1619*   90/90 146    Washington 69/76 19*   67/76 79    Wyoming 82/85 220*   82/85 106    Arkansas River Basin 6/6 *   6/6 125    Colorado River Basin 105/108 688*   107/108 130    Columbia River Basin 261/266 52*   259/266 91    Missouri River Basin 45/48 124*   45/48 100    Rio Grande River Basin 28/29 *   29/29 132    The Great Basin 103/105 908*   105/105 141

-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.