000 FGUS76 KPQR 122118 ESFPQR HYDROLOGIC OUTLOOK NATIONAL WEATHER SERVICE PORTLAND OR 215 PM PDT THU JUN 12 2008 ...OREGON WATER SUPPLY SUMMARY AS OF JUNE 12TH 2008... EXPECT NORMAL TO ABOVE-NORMAL WATER SUPPLY THIS SUMMER IN MOST OREGON RIVER BASINS...WITH THE EXCEPTION OF BASINS IN SOUTHEAST AND SOUTH-CENTRAL OREGON. HIGH-COUNTRY SNOWPACK REMAINS ABOVE NORMAL... ALTHOUGH MOST OF THE SNOW MELTED IN MID AND LATE MAY...RESULTING IN SOME MINOR SNOWMELT FLOODING IN NORTHEAST OREGON. SPRING PRECIPITATION HAS BEEN BELOW NORMAL...RESULTING IN SOME REDUCTIONS TO PREDICTED SUMMER RUNOFF VOLUMES FOR LOWER-ELEVATION BASINS. OVERALL...CONDITIONS ARE FAVORABLE FOR ADEQUATE WATER SUPPLY FOR THE SUMMER MONTHS. NOAA'S TEMPERATURE AND PRECIPITATION OUTLOOK FOR THE SUMMER CALLS FOR CONTINUED WEAKENING OF LA NINA CONDITIONS IN THE TROPICAL PACIFIC...WITH A RETURN TO NEUTRAL ENSO CONDITIONS BY JULY. THE LATEST OUTLOOK FOR THE SUMMER CALLS FOR ENHANCED PROBABILITY OF ABOVE-NORMAL TEMPERATURES ACROSS MOST OF THE STATE...ESPECIALLY IN SOUTHEAST OREGON...WITH BELOW-NORMAL TEMPERATURES LIKELY IN FAR- NORTHWEST OREGON. BELOW-NORMAL PRECIPITATION IS EXPECTED ACROSS THE PACIFIC NORTHWEST. FOR MORE INFORMATION ON SEASONAL OUTLOOKS AND LA NINA...VISIT WWW.CPC.NCEP.NOAA.GOV (LOWER CASE). THIS IS FINAL OUTLOOK FOR THE SEASON. REFER TO THE VARIOUS LINKS IN THIS PRODUCT TO MONITOR CONDITIONS THROUGH THE SUMMER. =================================================================== ...SNOWPACK ACROSS OREGON... SNOWPACK AS OF EARLY JUNE REMAINED ABOVE-NORMAL IN THE NORTH AND CENTRAL OREGON CASCADES AND IN THE NORTHEAST OREGON MOUNTAINS. REMAINING SNOW IS LIMITED TO ELEVATIONS ABOVE 4000 FEET IN THE NORTH OREGON CASCADES AND 5000 FEET IN THE CENTRAL OREGON CASCADES AND BLUE AND WALLOWA MOUNTAINS IN NORTHEAST OREGON. THE SNOWPACK HAS COMPLETELY MELTED IN THE SOUTHERN PART OF THE STATE. =================================================================== ...PRECIPITATION ACROSS OREGON... MAY PRECIPITATION WAS HIGHLY VARIABLE ACROSS THE STATE AND GENERALLY SHOWERY IN NATURE. MONTHLY TOTALS WERE ESPECIALLY AND BENEFICIALLY HIGH IN SOUTH-CENTRAL AND SOUTHEAST OREGON...AN AREA THAT HAS NOT SEEN AS MUCH PRECIPITATION IN THE WINTER AND EARLY SPRING AS OTHER PARTS OF THE STATE. THE TABLE BELOW SHOWS PRECIPITATION TOTALS IN TERMS OF PERCENT OF NORMAL FOR MAY AND THE FIRST EIGHT MONTHS OF THE 2008 WATER YEAR...ALONG WITH THE CHANGE IN THE SEASONAL TOTAL FROM THE PREVIOUS MONTH. BASIN PERCENT OF AVG FOR MAY OCT-MAY CHANGE ...CENTRAL AND EASTERN OREGON... KLAMATH (OREGON ONLY) 155 102 +3 LAKE COUNTY/GOOSE LAKE 143 85 +9 HARNEY/MALHEUR BASIN 102 86 +2 OWYHEE/MALHEUR 98 88 -1 GRANDE RONDE/BURNT 125 105 +1 UMATILLA/LOWER JOHN DAY 122 117 +1 UPPER JOHN DAY 109 104 -2 UPPER DESCHUTES/CROOKED 138 100 +5 HOOD/LOWER DESCHUTES 134 114 +1 ...WESTERN OREGON... WILLAMETTE VALLEY 65 103 -3 ROGUE/UMPQUA 85 104 -4 ================================================================== ...MAJOR IRRIGATION RESERVOIRS... AT THE CLOSE OF MAY...2,240,000 ACRE-FEET OF WATER WAS STORED IN 27 MAJOR IRRIGATION RESERVOIRS IN OREGON. THE CURRENT STORAGE REPRESENTS 86 PERCENT OF AVERAGE...AND IS 69 PERCENT OF HOLDING CAPACITY. THE CURRENT STORAGE IS 101 PERCENT OF STORAGE FOR THIS SAME TIME LAST YEAR. FLOOD CONTROL RESERVOIRS IN THE WILLAMETTE BASIN HAVE FILLED TO SUMMER FULL-POOL LEVELS. FOR MORE INFORMATION ON RESERVOIR CONDITIONS...VISIT THE FOLLOWING WEBSITES: WWW.WCC.NRCS.USDA.GOV/WSF/WSF-RESERVOIR.HTML (LOWER CASE)... WWW.USBR.GOV/PN/HYDROMET/SELECT.HTML (LOWER CASE) AND...WWW.NWD-WC.USACE.ARMY.MIL/NWP (LOWER CASE). ================================================================== ...OBSERVED AND FORECAST STREAMFLOW... OBSERVED STREAMFLOW IN MAY WAS ABOVE NORMAL ACROSS MOST OF THE STATE...WITH MAJOR RISES IN NORTHERN OREGON BASINS THAT INCLUDE MOUNTAIN TERRAIN. SNOWMELT RUNOFF RESULTED IN SOME MINOR FLOODING ALONG A FEW NORTHEAST OREGON RIVERS IN MID AND LATE MAY. FORECAST STREAMFLOW VOLUMES FOR THE SPRING AND SUMMER ARE GENERALLY A LITTLE ABOVE-NORMAL IN WESTERN AND NORTHEAST OREGON BASINS...AND NORMAL OR BELOW-NORMAL IN CENTRAL AND SOUTHEAST OREGON. THE FORECAST FOR THE COLUMBIA RIVER AT THE DALLES... WHICH IS A GOOD INDEX OF CONDITIONS IN THE COLUMBIA BASIN...IS 99% OF AVERAGE FOR THE APR-SEP PERIOD. THE FOLLOWING TABLE SUMMARIZES THE FORECASTS FOR SELECTED RIVERS... UPDATED JUNE 6TH. THESE FORECASTS ARE BASED ON OBSERVED PRECIPITATION AND STREAMFLOW AND ASSUME 90% OF NORMAL PRECIPITATION FOR THE FIRST HALF OF JUNE AND NORMAL PRECIPITATION THEREAFTER. 'CHANGE' INDICATES THE CHANGE IN THE FORECAST PERCENT OF NORMAL FROM LAST MONTH. W A T E R S U P P L Y F O R E C A S T S ...FORECAST AND AVERAGE ARE IN THOUSANDS OF ACRE-FEET... ...'%' IS PERCENT OF AVERAGE BASED ON 1971 - 2000 NORMALS... STREAM AND STATION PERIOD FORECAST % CHANGE AVERAGE COLUMBIA RIVER THE DALLES APR-SEP 97400.0 99 +1 98650. OWYHEE RIVER OWYHEE RES INFLOW MAR-JUL 465.0 76 -1 613. MALHEUR RIVER NEAR DREWSEY MAR-JUL 83.0 75 -4 110. N.F. MALHEUR RIVER BEULAH RES INFLOW MAR-JUL 77.0 95 +5 81. BURNT RIVER NEAR HEREFORD MAR-JUL 54.0 106 +6 51. POWDER RIVER NEAR SUMPTER MAR-JUL 74.0 106 -5 70. IMNAHA RIVER IMNAHA MAR-JUL 325.0 108 +5 301. GRANDE RONDE RIVER LA GRANDE MAR-JUL 305.0 122 +18 249. TROY MAR-JUL 1770.0 112 +4 1578. UMATILLA RIVER NEAR GIBBON APR-JUL 107.0 147 +40 73. PENDLETON APR-JUL 225.0 151 +43 149. S.F. WALLA WALLA RIVER NEAR MILTON APR-JUL 90.0 170 +55 53. M.F. JOHN DAY RIVER RITTER APR-JUL 165.0 134 +19 123. N.F. JOHN DAY RIVER NEAR MONUMENT MAR-JUL 800.0 134 +30 597. JOHN DAY RIVER SERVICE CREEK MAR-SEP 1280.0 111 +10 1153. DESCHUTES RIVER BENHAM FALLS APR-SEP 560.0 106 +11 528. CROOKED RIVER PRINEVILLE RES INFLOW MAR-JUL 148.0 80 -2 184. OCHOCO CREEK OCHOCO RES INFLOW MAR-JUL 33.0 92 0 36. MCKENZIE RIVER NEAR VIDA APR-SEP 1520.0 127 +10 1201. S. SANTIAM RIVER WATERLOO APR-SEP 815.0 139 +19 587. N. SANTIAM RIVER MEHAMA APR-SEP 1260.0 151 +22 834. WILLAMETTE RIVER SALEM APR-SEP 5510.0 115 -4 4804. CLACKAMAS RIVER ESTACADA APR-SEP 1010.0 135 +6 748. N. UMPQUA RIVER LEMOLO LK INFLOW APR-SEP 153.0 101 -13 151. ROGUE RIVER RAYGOLD APR-SEP 1030.0 116 +6 889. CHEWAUCAN RIVER NEAR PAISLEY MAR-JUL 57.0 64 -6 89. SILVIES RIVER NEAR BURNS APR-SEP 79.0 80 -9 99. WILLIAMSON RIVER BELOW SPRAGUE JUN-SEP 160.0 99 +2 267. SPRAGUE RIVER, NEAR CHILOQUIN JUN-SEP 72.0 88 -6 155. KLAMATH RIVER UPPER LAKE INFLOW JUN-SEP 195.0 98 +1 340. THESE FORECASTS ARE SELECTED FROM THOSE PREPARED BY: NATIONAL WEATHER SERVICE, NATURAL RESOURCE CONSERVATION SERVICER, AND B.C. HYDRO AND POWER AUTHORITY. FOR VARIOUS PROJECT INFLOWS, THE FORECASTS HAVE BEEN COORDINATED WITH THE U.S. ARMY CORP OF ENGINEERS AND THE U.S. BUREAU OF RECLAMATION. FOR FURTHER DETAILS...VISIT WWW.NWRFC.NOAA.GOV/WATER_SUPPLY/WATER_SUPPLY.CGI (LOWER CASE) AND WWW.CNRFC.NOAA.GOV/WATER_SUPPLY.PHP (LOWER CASE). BRYANT $$