National Weather Service Text Product Display

Flood Potential Outlook
Issued by NWS Great Falls, MT
Versions: 1 2
000
FGUS75 KTFX 112012
ESFTFX
122012-
WATER SUPPLY OUTLOOK
NATIONAL WEATHER SERVICE GREAT FALLS MT
212 PM MDT TUE JUN 11 2013

...Montana Water Supply Outlook as of June 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 June
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 May weather conditions for Montana
http://www.wrh.noaa.gov/tfx/climate/droughtsum/pdfs/montanawx_2013_05.pdf

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

Streamflow forecasts for rivers and sites east of the Continental
Divide provided by the Missouri Basin River Forecast Center -
MBRFC - in Pleasant Hill, Missouri
http://www.nwrfc.noaa.gov/ws/?zoom=8¢er=47.57652571374621,-114.7576904296875&map_type=esp_poa&overlay_basins=0&overlay_hsa=0&overlay_counties=0


SNOWPACK INFORMATION...
Current day snow water equivalent information from the National
Operational Hydrologic Remote Sensing Center - NOHRSC
http://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.
http://www.wcc.nrcs.usda.gov/gis/images/mt_swepctnormal_update.png


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

Calendar Year 2013 percent of normal precipitation
http://www.wrcc.dri.edu/wwdt/images/pon5/mo_cl.png

Water Year 2013 percent of normal precipitation
http://www.wrcc.dri.edu/wwdt/images/pon8/mo_cl.png

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


RESERVOIR INFORMATION...
Reservoir storage provided by NRCS - percent of capacity, percent of
average and percent of last year
http://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 June 2013 provided by NRCS
http://nris.mt.gov/NRCS/swsi/pdf/swsi201306.pdf


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


This is the final Water Supply Outlook for 2013. Outlooks for 2014
will begin in January.


WEATHER.GOV/GREATFALLS

&
National Weather Service Weather Forecast Office
