National Weather Service Text Product Display

Flood Potential Outlook
Issued by NWS Great Falls, MT
Versions: 1 2
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WATER SUPPLY OUTLOOK
NATIONAL WEATHER SERVICE GREAT FALLS MT
343 PM MDT WED MAY 15 2013

...Montana Water Supply Outlook as of May 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 west of
the continental divide to be near to below average with the outlook
east of the divide to be below to well below average. These
forecasts assume near normal moisture and runoff conditions for May
through July and do not account for much below average - 70% or
less - or above average - 100% or more - snowmelt or spring rains.

Detailed summary of April weather conditions for Montana.
www.wrh.noaa.gov/tfx/climate/droughtsum/pdfs/montanawx_2013_04.pdf

Streamflow forecasts for rivers and sites west of the Continental
Divide provided by the Northwest River Forecast Center /NWRFC/ in
Portland, Oregon.
www.nwrfc.noaa.gov/water_supply/ws_report.cgi?Type=STATE&
Source=Montana&Wyr=2013

Streamflow forecasts for rivers and sites east of the Continental
Divide provided by the Missouri Basin River Forecast Center /MBRFC/
in Pleasant Hill, Missouri.
www.crh.noaa.gov/Image/mbrfc/water_supply/2013/may/
streamflow_forecast.gif


SNOWPACK INFORMATION...
Current day snow water equivalent information from the National
Operational Hydrologic Remote Sensing Center /NOHRSC/.
www.nohrsc.noaa.gov/interactive/html/map_only.php?var=ssm_swe&
min_x=-116.29166666667&min_y=43.158333333334&max_x=-103.65833333333&
max_y=50.266666666667&bgvar=dem&shdvar=shading&title=0&width=800&
height=450&font=0&lbl=m&palette=1&h_o=0&metric=0&snap=1&o9=1&o12=1
&o13=1

Current day percent of normal snow water equivalent by basin.
www.wcc.nrcs.usda.gov/gis/images/mt_swepctnormal_update.png


PRECIPITATION INFORMATION...
April 2013 percent of normal precipitation
www.wrcc.dri.edu/wwdt/images/pon1/mo_cl.png

Calendar Year 2013 percent of normal precipitation
www.wrcc.dri.edu/wwdt/images/pon4/mo_cl.png

Water Year 2013 percent of normal precipitation
www.wrcc.dri.edu/wwdt/images/pon7/mo_cl.png

Preliminary map of percent of normal precipitation for the current
month provided by the Western Region Climate Center /WRCC/.
www.wrcc.dri.edu/cgi-bin/anomimage.pl?mon1mPpct.gif


RESERVOIR INFORMATION...
Reservoir storage provided by Natural Resources Conservation
Service /NRCS/ including percent of capacity, percent of average and
percent of last year.
www.wcc.nrcs.usda.gov/cgibin/resv-graph.pl?state=MT


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 May 2013 provided by NRCS.
nris.mt.gov/NRCS/swsi/pdf/swsi201304.pdf


CLIMATE OUTLOOK...
Current climate outlook issued by the Climate Prediction
Center /CPC/.
www.cpc.ncep.noaa.gov/products/predictions/multi_season/
13_seasonal_outlooks/color/page2.gif

The final Water Supply Outlook for 2013 will be issued by June 15.


&&
National Weather Service Weather Forecast Office
