National Weather Service Text Product Display

Flood Potential Outlook
Issued by NWS Portland, OR
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WATER SUPPLY OUTLOOK
NATIONAL WEATHER SERVICE PORTLAND OR
330 PM PST WED JUNE 12 2013

...OREGON WATER SUPPLY OUTLOOK AS OF JUNE 12 2013...

THE OREGON WATER SUPPLY FOR SUMMER 2013 IS FORECAST TO BE
BELOW-NORMAL FOR MUCH OF SOUTHWEST...CENTRAL AND EASTERN
OREGON...ESPECIALLY SO FOR SOUTH-CENTRAL AND SOUTHEAST BASINS. THE
WATER SUPPLY FORECAST FOR NORTHWEST AND NORTH-CENTRAL OREGON BASINS
IS NEAR-NORMAL. WATER SUPPLY FORECASTS ARE BASED ON SNOWPACK
CONDITIONS AND OBSERVED PRECIPITATION FOR THE 2013 WATER YEAR THUS
FAR /OCTOBER 2012 - MAY 2013/. WET CONDITIONS DURING THE SECOND HALF
OF MAY PROVIDED SOME RELIEF FROM DRY CONDITIONS IN NORTHWEST OREGON
BUT THE PARTS OF THE STATE ALREADY FACING THE THREAT OF DROUGHT THIS
SUMMER SAW LITTLE CHANGE IN CONDITIONS. THE NATIONAL DROUGHT MONITOR
INDICATES SEVERE DROUGHT /D2/ FOR FAR-SOUTHEAST OREGON...MODERATE
DROUGHT /D1/ CONDITIONS FOR MUCH OF SOUTH-CENTRAL...SOUTHEAST...AND
NORTHEAST OREGON...AND ABNORMALLY DRY CONDITIONS /D0/ FOR MUCH OF
THE REST OF THE STATE.

REFER TO THE SECTIONS BELOW AND THE LINKS PROVIDED FOR DETAILS
REGARDING SNOWPACK...PRECIPITATION...RESERVOIR CONDITIONS AND WATER
SUPPLY FORECASTS FOR INDIVIDUAL BASINS.

NOAA`S CLIMATE OUTLOOK FOR JUNE-AUGUST CALLS FOR AN ENHANCED
POSSIBILITY OF BELOW-NORMAL PRECIPITATION AND ABOVE-NORMAL
TEMPERATURES...ESPECIALLY FOR THE EASTERN HALF OF OREGON. THIS WOULD
LIKELY EXACERBATE DROUGHT IMPACTS. FOR MORE INFORMATION ON SEASONAL
OUTLOOKS...VISIT THE CLIMATE PREDICTION CENTER WEB PAGE AT
WWW.CPC.NCEP.NOAA.GOV.

THIS IS THE FINAL WATER SUPPLY OUTLOOK OF THE SEASON.
HOWEVER...DROUGHT CONDITIONS ARE LIKELY TO PERSIST...SO LOOK FOR
DROUGHT INFORMATION STATEMENTS FROM THE WEATHER FORECAST OFFICES
SERVING OREGON THROUGH THE SUMMER MONTHS.

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SNOWPACK ACROSS OREGON

VERY LITTLE SNOWPACK REMAINED IN OREGON AS OF EARLY JUNE. ONLY A FEW
SNOTEL STATIONS ABOVE 6000 FEET IN NORTHERN OREGON WERE STILL
REPORTING SNOW. OVERALL...THE SEASONAL SNOWPACK WAS BELOW-NORMAL IN
MOST BASINS...AND SPRING SNOWMELT CAME TWO TO FOUR WEEKS EARLIER
THAN USUAL. REFER TO THE FOLLOWING LINKS FOR MORE DETAILS.

NOAA`S NATIONAL WEATHER SERVICE - NORTHWEST RIVER FORECAST CENTER
WWW.NWRFC.NOAA.GOV/SNOW/

USDA - NATURAL RESOURCES CONSERVATION SERVICE
WWW.WCC.NRCS.USDA.GOV/SNOWCOURSE/SC-SNOWPACK.HTML

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PRECIPITATION ACROSS OREGON

SEASONAL PRECIPITATION TOTALS ARE NEAR-NORMAL IN NORTHWEST OREGON
AND BELOW-NORMAL IN SOUTHWEST...CENTRAL AND EASTERN OREGON FOR THE
FIRST EIGHT MONTHS OF THE 2013 WATER YEAR /OCT-MAY/...RANGING FROM
70 TO 99 PERCENT IN WESTERN OREGON AND 65 TO 85 PERCENT IN CENTRAL
AND EASTERN OREGON. THE FIRST HALF OF MAY 2013 WAS DRY ACROSS THE
STATE...BUT THE SECOND HALF WAS NOTABLY WET IN NORTHWEST AND
NORTH-CENTRAL OREGON...WITH LESSER PRECIPITATION AMOUNTS FOR THE
REST OF THE STATE. VISIT THE FOLLOWING LINKS FOR MORE DETAILS ON
PRECIPITATION TOTALS.

NOAA`S NATIONAL WEATHER SERVICE - NORTHWEST RIVER FORECAST CENTER
WWW.NWRFC.NOAA.GOV/WATER_SUPPLY/WY_SUMMARY/WY_SUMMARY.PHP

USDA - NATURAL RESOURCES CONSERVATION SERVICE
WWW.WCC.NRCS.USDA.GOV/SNOW/SNOTEL-PRECIP-REPORT.HTML

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MAJOR IRRIGATION RESERVOIRS

AT THE CLOSE OF MAY...RESERVOIR STORAGE WAS 74 PERCENT OF
AVERAGE...DOWN 9 PERCENT FROM THE PREVIOUS MONTH. THE CURRENT
STORAGE OF 1.8 MILLION ACRE FEET IN 26 IRRIGATION RESERVOIRS AROUND
THE STATE IS 56 PERCENT OF USABLE CAPACITY AND 75 PERCENT OF STORAGE
FOR THIS SAME TIME LAST YEAR. RESERVOIR DATA IS PROVIDED COURTESY OF
THE NATURAL RESOURCES CONSERVATION SERVICE.

VISIT THE FOLLOWING LINK FOR MORE INFORMATION:
WWW.WCC.NRCS.USDA.GOV/WSF/WSF-RESERVOIR.HTML

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CURRENT AND FORECAST STREAMFLOW

OBSERVED STREAMFLOW FOR MAY WAS BELOW-NORMAL...EXCEPT FOR SOME
SIGNIFICANT RISES AND NEAR-NORMAL FLOW IN NORTHWEST OREGON DURING
THE LATTER HALF OF MAY. VISIT WATERWATCH.USGS.GOV FOR MORE DETAILS
ON OBSERVED STREAMFLOW.

FORECAST STREAMFLOW VOLUMES FOR THE SPRING AND SUMMER ARE GENERALLY
BELOW-NORMAL AND RANGE FROM 20 TO 95 PERCENT OF NORMAL...WITH THE
LOWEST PERCENTAGES IN SOUTHEAST AND SOUTH-CENTRAL OREGON...INCLUDING
THE OWYHEE BASIN AND PORTIONS OF THE KLAMATH...AND THE HIGHEST
PERCENTAGES IN NORTHWEST OREGON BASINS DRAINING THE WEST SLOPES OF
THE CASCADES. THE FORECAST FOR THE COLUMBIA RIVER AT THE DALLES...
WHICH IS A GOOD INDEX OF CONDITIONS IN THE COLUMBIA BASIN...IS 97%
OF AVERAGE FOR THE APRIL-SEPTEMBER PERIOD.

VISIT THE FOLLOWING LINKS FOR MORE DETAILS ON BASIN-SCALE WATER
SUPPLY FORECASTS:

NOAA`S NATIONAL WEATHER SERVICE - NORTHWEST RIVER FORECAST CENTER
WWW.NWRFC.NOAA.GOV/WS/

USDA - NATURAL RESOURCES CONSERVATION SERVICE
WWW.OR.NRCS.USDA.GOV/WSF/

BRYANT
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National Weather Service Weather Forecast Office
