Drought Information Statement
Issued by NWS Portland, OR

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DROUGHT INFORMATION STATEMENT
NATIONAL WEATHER SERVICE PORTLAND OREGON
515 PM PDT THU AUG 13 2015

...UPDATE ON DROUGHT CONDITIONS AND IMPACTS FOR OREGON AS OF
AUGUST 13TH 2015...

DROUGHT CONDITIONS ACROSS OREGON RANGE FROM MODERATE TO EXTREME...AS
IDENTIFIED BY THE U.S. DROUGHT MONITOR. DROUGHT CONDITIONS HAVE
INTENSIFIED AND EXPANDED ACROSS THE STATE OVER THE PAST SEVERAL
MONTHS...DUE TO TWO MAIN FACTORS:

1 - A WINTER WITH RECORD-LOW OR NEAR-RECORD-LOW SNOWPACK CAUSED BY A
COMBINATION OF BELOW-AVERAGE PRECIPITATION AND MUCH-ABOVE-AVERAGE
TEMPERATURES.

2 - A DRY AND HOT SPRING AND SUMMER..WITH PERIODS OF RECORD-HIGH
TEMPERATURES IN MAY...JUNE...AND JULY...ESPECIALLY IN WESTERN AND
NORTH-EAST OREGON. OVERALL IT WAS THE HOTTEST JUNE ON RECORD FOR
MOST OF OREGON AND ONE OF THE HOTTEST JULYS ON RECORD.

VISIT DROUGHT.GOV FOR MORE DETAILS ON DROUGHT CONDITIONS AND
CATEGORIES IN OREGON AND THE PACIFIC NORTHWEST.

STATE DROUGHT DECLARATIONS HAVE BEEN ISSUED FOR MANY COUNTIES...TOO
MANY TO LIST HERE. AFFECTED COUNTIES INCLUDE ALL THOSE IN
SOUTHWEST...SOUTHEAST...AND NORTH-CENTRAL OREGON. FOR DETAILS...
VISIT THE OREGON WATER RESOURCES DROUGHT WATCH AT
WWW.OREGON.GOV/OWRD/PAGES/WR/DROUGHT.ASPX.

US DEPT OF AGRICULTURE DROUGHT DISASTER DECLARATIONS ARE ALSO IN
EFFECT FOR MOST OREGON COUNTIES...EXCEPT FOR A HANDFULL OF COUNTIES
IN EXTREME NORTHWEST OREGON. VISIT USDA.GOV FOR MORE INFORMATION ON
DISASTER DECLARATIONS AND ASSISTANCE PROGRAMS FOR DROUGHT-IMPACTED
AREAS.

FOR MUCH OF SOUTHERN OREGON...THIS IS THE SECOND OR THIRD YEAR OF
DROUGHT...AND DROUGHT IMPACTS CONTINUE TO INTENSIFY. HOWEVER...THE
AREAL EXTENT AND SEVERITY OF THIS YEAR`S DROUGHT EXCEED THE TWO
PREVIOUS YEARS FOR THE STATE AS A WHOLE.

DROUGHT IMPACTS WILL EVOLVE AND CHANGE THROUGH THE FALL AND MAY
PERSIST INTO NEXT WINTER. THE MUCH-PUBLICIZED ONSET OF A STRONG EL
NINO IN THE TROPICAL PACIFIC OCEAN MAY PROVIDE SOME DROUGHT RELIEF
FOR OREGON...ESPECIALLY THE SOUTHERN HALF...THIS COMING WINTER.

RECENT MAJOR DROUGHT IMPACTS INCLUDE ACTIVE WILDFIRES IN VARIOUS
PARTS OF THE STATE...AND MAJOR DIE-OFFS FOR STURGEON AND MIGRATING
SALMON DUE TO THE LOW STREAMFLOW AND VERY WARM WATER TEMPERATURES.
ONGOING DROUGHT IMPACTS ALSO INCLUDE: DRASTICALLY-REDUCED WATER
ALLOCATIONS FOR IRRIGATORS IN SOME BASINS...REDUCED WATER SUPPLY FOR
COMMUNITIES ESPECIALLY WHERE DEPENDENT ON NATURAL STREAMFLOW
ONLY...REDUCED ACREAGE AND OVERALL PRODUCTION FOR MANY FIELD
CROPS...AND POOR RANGE CONDITIONS AND WATER AVAILABILITY FOR CATTLE
AND OTHER RANGE ANIMALS.

NOTE...THIS PRODUCT WILL BE ISSUED ON AT LEAST A MONTHLY BASIS IN
2015 AS LONG AS WIDESPREAD DROUGHT CONDITIONS PERSIST IN OREGON. THE
NEXT UPDATE WILL BE ISSUED BY SEPTEMBER 11TH.

===================================================================
...OBSERVED PRECIPITATION AND TEMPERATURES...

WATER-YEAR PRECIPITATION /OCTOBER 2014 - JULY 2015/ IS GENERALLY 60
TO 80 PERCENT OF AVERAGE...EXCEPT FOR 80 TO 100 PERCENT IN FAR-
SOUTHEAST OREGON. THESE NUMBERS AREN`T EXTREME...BUT IT`S WORTH
NOTING THAT MOST OF THE WINTER PRECIPITATION CAME IN BIG PULSES AS
TROPICALLY-SOURCED ATMOSPHERIC RIVERS...WHICH BROUGHT SEVERAL DAYS
OF FAIRLY HEAVY RAIN INTERSPERSED AMONG EXTENDED DRY PERIODS. THIS
MEANT THAT MOST STORMS DID NOT PRODUCE MOUNTAIN SNOW AND GRADUAL
RECHARGE OF SOIL MOISTURE THROUGH THE WINTER. BY APRIL AND MAY...
MOST RIVERS WERE DROPPING TOWARD SUMMER BASEFLOW LEVELS INSTEAD OF
THE USUAL SPRING SNOWMELT RISES. SUMMER SHOWERS AND THUNDERSTORMS
HAVE PROVIDED SOME RELIEF FROM VERY DRY CONDITIONS...ESPECIALLY FOR
PORTIONS OF SOUTH-CENTRAL AND SOUTHEAST OREGON.

TEMPERATURES FOR THE PAST SEVERAL MONTHS HAVE BEEN NOTABLY ABOVE-
AVERAGE...BOTH FOR VALLEY AND MOUNTAIN LOCATIONS. JUNE AND JULY HAVE
BEEN NOTABLY HOT AND EXCACERBATED DRY CONDITIONS...FIRE THREAT...AND
WARM WATER TEMPERATURES.

THE FOLLOWING TABLE SHOWS JULY 2015 TEMPERATURE DEPARTURE FROM
AVERAGE...MONTHLY PRECIPITATION TOTAL AND PERCENT OF AVERAGE...AND
WATER YEAR PRECIPITATION (OCT 2014 - JUL 2015) AND PERCENT OF
AVERAGE FOR SELECTED OREGON LOCATIONS.

LOCATION   JULY AVE   JULY PRECIP  PERCENT    WY PRECIP    PERCENT
           TEMP DEP    (INCHES)    AVERAGE     (INCHES)    AVERAGE
========   ========   ===========  =======    =========    =======
ASTORIA      +3.8         0.39        38        53.40         83
NORTH BEND   +3.6         0.00         0        42.54         68
PORTLAND     +4.7         0.57        88        30.04         89
EUGENE       +4.7         0.05        93        29.46         67
MEDFORD      +4.3         0.29        98        14.28         82
REDMOND      +1.6         0.44        80         8.75        110
PENDLETON    +3.5         0.00         0         9.70         83
KLAM. FALLS  +2.2         0.52       108        12.40         89
ONTARIO      +0.4         0.49       163         9.23         97
BURNS        +8.4         0.51       128         9.07         90

VISIT WWW.NWRFC.NOAA.GOV/WATER_SUPPLY/WY_SUMMARY/WY_SUMMARY.PHP FOR
MORE DETAILS ON OBSERVED PRECIPITATION AND TEMPERATURES IN OREGON.

===================================================================
...PRECIPITATION AND TEMPERATURE OUTLOOK FOR THE NEXT SEVERAL
MONTHS...

CONTINUED ABOVE-NORMAL TEMPERATURES ARE EXPECTED THROUGH THE REST OF
SUMMER AND FALL. WITH THE ONSET OF A STRONG EL NINO IN THE TROPICAL
PACIFIC...THE CLIMATE PREDICTION OUTLOOK FOR TEMPERATURES SHOWS HIGH
LIKELIHOOD OF ABOVE-NORMAL TEMPERATURES CONTINUING THROUGH THE
UPCOMING WINTER OF 2015-16. THE OUTLOOK FOR PRECIPITATION FOR THE
COMING FALL AND WINTER IS MORE UNCERTAIN BUT LEANS BELOW-AVERAGE.

VISIT WWW.CPC.NCEP.NOAA.GOV FOR MORE INFORMATION ON SEASONAL
OUTLOOKS AND EVOLVING EL NINO CONDITIONS.

===================================================================
...RESERVOIR CONDITIONS...

SEVERAL RESERVOIRS IN SOUTH-CENTRAL AND SOUTHEAST OREGON HAVE LITTLE
OR NO REMAINING STORAGE AS OF MID JULY. FOR EXAMPLE...WARM SPRINGS
RESERVOIR STORAGE IS 0 PERCENT OF CAPACITY AND OWYHEE RESERVOIR IS 4
PERCENT OF CAPACITY. IN OTHER PARTS OF THE STATE...RESERVOIR STORAGE
IS GENERALLY 20 TO 60 PERCENT OF AVERAGE...AND OPERATORS ARE DOING
THEIR BEST TO MANAGE THE REMAINING STORAGE FOR A VARIETY OF
DOWNSTREAM NEEDS...INCLUDING IRRIGATION...IN-STREAM FISHERIES
HABITAT...RECREATION...AND HYDRO-ELECTRIC POWER.

MOST OF THE SMALLER RESERVOIRS SUPPLYING URBAN AREAS...SUCH AS THE
BULL RUN PROJECT OPERATED BY PORTLAND WATER BUREAU...ARE NEAR NORMAL
STORAGE WITH ADEQUATE SUPPLY FOR THE SUMMER AND FALL.

VISIT WWW.WCC.NRCS.USDA.GOV/CGIBIN/RESV_RPT.PL?STATE=OREGON FOR MORE
INFORMATION ON RESERVOIR CONDITIONS.

===================================================================
...STREAMFLOW AND SUMMER WATER SUPPLY VOLUMES...

STREAMFLOW IN JULY WAS BELOW AVERAGE FOR MOST OREGON RIVERS...BUT
NEAR-AVERAGE IN FAR-SOUTHWEST AND MUCH OF SOUTHEAST OREGON. MANY
RIVERS AND STREAMS ALONG THE OREGON COAST HAVE BEEN NEAR OR BELOW
PREVIOUS RECORDS FOR THIS TIME OF YEAR.

WATER SUPPLY VOLUMES FOR APRIL - SEPTEMBER ARE TRENDING 25 TO 60
PERCENT OF AVERAGE ACROSS THE STATE...WITH SOME BASINS IN EASTERN
OREGON ONLY 15 TO 25 PERCENT. MANY OF THESE VOLUMES ARE AT OR NEAR
THE PREVIOUS LOWEST STREAMFLOW VOLUMES ON RECORD. THE COLUMBIA RIVER
AT THE DALLES...A GOOD INDEX FOR CONDITIONS THROUGHOUT THE COLUMBIA
BASIN...IS ON TRACK FOR 67 PERCENT OF AVERAGE FOR APR-SEP.

VISIT WATERWATCH.USGS.GOV FOR DETAILS ABOUT INDIVIDUAL BASINS AND
RIVER GAGES AND WWW.NWRFC.NOAA.GOV FOR WATER SUPPLY VOLUMES.

===================================================================
...DROUGHT IMPACTS IN OREGON...

HOT AND DRY CONDITIONS SINCE MAY HAVE EXACERBATED DROUGHT IMPACTS
AROUND THE STATE...ESPECIALLY IN WESTERN AND NORTHEAST OREGON.

ONE OF THE MOST TANGIBLE IMPACTS OF THE DROUGHT IS THAT MANY RIVERS
HAVE BEEN AT OR NEAR RECORD LOW STREAMFLOW FOR THIS TIME OF
YEAR...LEADING TO RESTRICTIONS AND REDUCTIONS IN WATER USE FOR MANY
IRRIGATION DISTRICTS AND SOME COMMUNITIES.

SEVERAL OREGON RIVERS HAVE SEEN HIGH FISH MORTALITY DUE TO THE LOW
FLOWS AND WARM TEMPERATURES...AND MANY RIVERS HAVE FISHING
RESTRICTIONS IN PLACE.

FOREST FUEL CONDITIONS REMAIN VERY DRY FOR MOST OF WESTERN...CENTRAL
AND NORTHEAST OREGON...AND IT HAS BEEN AN ACTIVE FIRE SEASON SINCE
JUNE.

IF YOU HAVE QUESTIONS OR COMMENTS ABOUT THIS DROUGHT INFORMATION
STATEMENT PLEASE CONTACT...

NATIONAL WEATHER SERVICE - PORTLAND
PHONE: 503-261-9246
EMAIL: W-PQR.WEBMASTER@NOAA.GOV

$$


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