Posted: Feb 14, 2013 3:39 PM by Meteorologist Mike Heard
Montana Water Supply Outlook as of February 2013
The Montana Water Supply Forecast is issued by the National Weather
Service Office in Great Falls in cooperation and coordination with
the National Weather Service Office in Missoula.
The outlook for the 2013 summer season projects water supply east and
west of the continental divide to be near to below average. These
forecasts assume near normal moisture and runoff conditions for
February through July and do not account for much below average - 70%
or less - or above average - 100% or more - snowmelt or spring
* Detailed summary of January weather conditions for Montana
* Streamflow forecasts for rivers and sites west of the
Continental Divide provided by the Northwest River Forecast
Center - NWRFC - in Portland, Oregon.
* Streamflow forecasts for rivers and sites east of the
Continental Divide provided by the Missouri Basin River Forecast
Center - MBRFC - in Pleasant Hill, Missouri.
* Current day snow water equivalent information from the National
Operational Hydrologic Remote Sensing Center - NOHRSC.
* Current day percent of normal snow water equivalent by basin.
* January 2013 percent of normal precipitation
* Calendar Year 2013 percent of normal precipitation
* Water Year 2013 percent of normal precipitation
* Preliminary map of percent of normal precipitation for the
current month provided by the Western Region Climate Center
* Reservoir storage provided by NRCS - percent of capacity,
percent of average and percent of last year
SURFACE WATER SUPPLY INDEX...
The Surface Water Supply Index - SWSI - is a measure of available
surface water availability for the spring and summer months. The
SWSI accounts for mountain snowpack, mountain precipitation,
streamflow, reservoir storage and soil moisture. SWSI values are
provided by the Natural Resources Conservation Service - NRCS - with
the US Dept of Agriculture.
* SWSI for February 2013 provided by NRCS
* Current climate outlook issued by the Climate Prediction
Center - CPC
The next Water Supply Outlook for 2013 will be issued by March 15.