Idaho SNOTEL Precipitation Update Report

Idaho SNOTEL 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 Sunday, May 11, 2025

Basin Site Name	Elev (ft)	Month-to-Date Precipitation			Water Year-to-Date Precipitation
Basin Site Name	Elev (ft)	Current (in)	Median (in)	Pct of Median	Current (in)	Median (in)	Pct of Median
NORTHERN PANHANDLE REGION
Basin Index (%)		-14			87
COEUR D'ALENE-ST. JOE RIVER BASIN
Basin Index (%)		31			81
CLEARWATER BASIN
Basin Index (%)		24			88
SALMON BASIN
Basin Index (%)		67			97
WEISER BASIN
Basin Index (%)		47			103
PAYETTE BASIN
Basin Index (%)		72			107
BOISE BASIN
Basin Index (%)		61			101
BIG WOOD BASIN
Basin Index (%)		16			92
LITTLE WOOD BASIN
Basin Index (%)		19			84
BIG LOST BASIN
Basin Index (%)		78			89
LITTLE LOST
Basin Index (%)		93			80
BIRCH, MEDICINE LODGE, BEAVER, CAMAS BASINS
Basin Index (%)		122			82
HENRYS FORK, TETON BASINS
Basin Index (%)		75			94
SNAKE BASIN ABOVE PALISADES
Basin Index (%)		39			98
WILLOW, BLACKFOOT, PORTNEUF BASINS
Basin Index (%)		56			100
SNAKE BASIN ABOVE AMERICAN FALLS
Basin Index (%)		50			97
RAFT BASIN
Basin Index (%)		58			93
GOOSE CREEK BASIN
Basin Index (%)		36			91
SALMON FALLS BASIN
Basin Index (%)		57			94
BRUNEAU BASIN
Basin Index (%)		56			97
OWYHEE BASIN
Basin Index (%)		126			104
BEAR RIVER BASIN
Basin Index (%)		74			99

-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.

The MONTH-TO-DATE PRECIPITATION Percent of Median (or Average) represents the total precipitation
(beginning on the 1st day of the current month) found at selected SNOTEL sites in or
near the basin compared to the Median (or Average) value for those sites on this day.

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.