Water Supply Summary

General Summary ! Below average temperatures and Precipitationduring April have caused decreases in expected Spring streamflow.Cool temperatures have delayed active Spring snowmelt in all areas.The slow rate of snowmelt observed during April allowed more of themelt runoff to be retained as soil moisture. Near to slightly aboveaverage streamflow is predicted for most areas. The exception is themain stem of the Snake river from Milner to Brownlee Dam wherestreamflow will be 60 to 80 percentof average.

April "record" high/low temperatures and precipitation/snow amounts.Please see the complete list of records at the National WeatherService field office's Climatology Web pages for more details.

APR 12 2008 A RECORD LOW TEMPERATURE OF 20 DEGREES WAS SET AT ROME YESTERDAY. THIS BREAKS THE OLD RECORD OF 23 SET IN 1953.

MON APR 14 2008 A RECORD HIGH TEMPERATURE OF 80 DEGREES WAS SET AT BOISE YESTERDAY. THIS TIES THE OLD RECORD OF 80 SET IN 1988. A RECORD HIGH TEMPERATURE OF 80 DEGREES WAS SET AT BURNS OREGON YESTERDAY. THIS TIES THE OLD RECORD OF 80 SET IN 1947.

MON APR 21 2008 A RECORD LOW TEMPERATURE OF 13 DEGREES WAS SET AT BURNS YESTERDAY. THIS BREAKS THE OLD RECORD OF 18 SET IN 2007. A RECORD LOW TEMPERATURE OF 8 DEGREES WAS SET AT MCCALL YESTERDAY. THIS BREAKS THE OLD RECORD OF 12 SET IN 1982.

TUE APR 22 2008 A RECORD LOW TEMPERATURE OF 18 DEGREES WAS SET AT JEROME YESTERDAY. THIS BREAKS THE OLD RECORD OF 21 SET IN 1970.

TUE APR 22 2008 A RECORD LOW TEMPERATURE OF 14 DEGREES WAS SET AT MCCALL YESTERDAY. THIS BREAKS THE OLD RECORD OF 15 SET IN 1951.

TUE APR 22 2008 A RECORD LOW TEMPERATURE OF 11 DEGREES WAS SET AT BURNS YESTERDAY. THIS BREAKS THE OLD RECORD OF 15 SET IN 1963.

TUE APR 22 2008 A RECORD LOW TEMPERATURE OF 15 DEGREES WAS SET AT ROME YESTERDAY. THIS BREAKS THE OLD RECORD OF 23 SET IN 1968.

SUN APR 27 2008 A RECORD LOW TEMPERATURE OF 10 DEGREES WAS SET AT MCCALL YESTERDAY. THIS BREAKS THE OLD RECORD OF 11 SET IN 1948. A RECORD LOW TEMPERATURE OF 22 DEGREES WAS SET AT JEROME YESTERDAY. THIS BREAKS THE OLD RECORD OF 24 SET IN 1922. A RECORD LOW TEMPERATURE OF 20 DEGREES WAS SET AT ROME YESTERDAY. THIS BREAKS THE OLD RECORD OF 24 SET IN 1985.

MON APR 28 2008 A RECORD LOW TEMPERATURE OF 23 DEGREES WAS SET AT ROME YESTERDAY. THIS BREAKS THE OLD RECORD OF 26 SET IN 1966.

SUN APR 20 2008 A RECORD SNOWFALL OF A TRACE WAS SET AT MEDFORD TODAY. THIS TIES THE OLD RECORD OF TRACE SET IN 1972.

SUN APR 20 2008 A RECORD LOW TEMPERATURE OF 18 DEGREES WAS SET AT MONTAGUE TODAY. THIS BREAKS THE OLD RECORD OF 23 SET IN 1963.

SUN APR 13 2008WESTERN MONTANA THIS AFTERNOON APRIL 13, A RIDGE OF HIGH PRESSURE AND WARM SOUTHERLY WINDS ALLOWEDTEMPERATURES TO TIE PREVIOUS RECORD HIGHS. BELOW IS A PRELIMINARYLIST OF THE RECORDS TIED.LOCATION TODAYS RECORD HIGH HIGH (YEAR SET)MISSOULA 79 79 (1904)KALIELL 74 74 (1988)THOMPSON FALLS 80 80 (1913)

SUN APR 20 2008WESTERN MONTANA AND NORTH CENTRAL IDAHO ON APRIL 20 2008, NEW RECORD LOW PREVIOUS RECORD (YEAR)ANACONDA 9 11 (1927)DRUMMOND 9 11 (1951)BUTTE 7 10 (1927)

TUE APR 22 2008 A RECORD LOW TEMPERATURE OF 7 DEGREES TIES THE PREVIOUS RECORD LOWOF 7 DEGREES SET IN 2001.

SAT APR 19 2008 A RECORD LOW TEMPERATURE OF 29 DEGREES WAS SET AT WENATCHEE PANGBORN FIELD TODAY. THIS BREAKS THE OLD RECORD OF 32 SET IN 1966.RECORDS HAVE BEEN KEPT AT WENATCHEE AIRPORT SINCE 1959.

SAT APR 19 2008 A RECORD SNOWFALL OF 0.4 INCH(ES) WAS SET AT OKANE AIRPORT YESTERDAY APR 18 2008. THIS BREAKS THE OLD RECORD OF TRACE SET IN 2005. RECORDS HAVE BEEN KEPT AT OKANE AIRPORT SINCE 1881.

FRI APR 11 2008NOTE: STATIONS MARKED WITH * INDICATE THAT THE STATION REPORTS ONCEPER DAY. FOR CONSISTENCY, THESE VALUES ARE CONSIDERED TO HAVEOCCURRED ON THE DAY THE OBSERVATION WAS TAKEN BUT MAY HAVE ACTUALLYOCCURRED (EECIALLY FOR MAX TEMPERATURE) ON THE PREVIOUS DAY.STATION PREVIOUS NEW RECORDS RECORD/YEAR RECORD BEGAN*GOLDENDALE, WA 25 / 1997 25 (TIED) 1931

MON APR 14 2008NOTE: STATIONS MARKED WITH * INDICATE THAT THE STATION REPORTS ONCEPER DAY. FOR CONSISTENCY, THESE VALUES ARE CONSIDERED TO HAVEOCCURRED ON THE DAY THE OBSERVATION WAS TAKEN BUT MAY HAVE ACTUALLYOCCURRED (EECIALLY FOR MAX TEMPERATURE) ON THE PREVIOUS DAY.STATION PREVIOUS NEW RECORDS RECORD/YEAR RECORD BEGAN*LONG CREEK, OR 78 / 1962 79 1957*MONUMENT 2, OR 85 / 1985 88 1961*PENDLETON(ES), OR 83 / 1985 83 (TIED) 1956

TUE APR 15 2008NOTE: STATIONS MARKED WITH * INDICATE THAT THE STATION REPORTS ONCEPER DAY. FOR CONSISTENCY, THESE VALUES ARE CONSIDERED TO HAVEOCCURRED ON THE DAY THE OBSERVATION WAS TAKEN BUT MAY HAVE ACTUALLYOCCURRED (EECIALLY FOR MAX TEMPERATURE) ON THE PREVIOUS DAY.STATION PREVIOUS NEW RECORDS RECORD/YEAR RECORD BEGAN*PELTON DAM, OR 25 / 2001 25 (TIED) 1958*BICKLETON, WA 22 / 2001 21 1931

SAT APR 19 2008NOTE: STATIONS MARKED WITH * INDICATE THAT THE STATION REPORTS ONCEPER DAY. FOR CONSISTENCY, THESE VALUES ARE CONSIDERED TO HAVEOCCURRED ON THE DAY THE OBSERVATION WAS TAKEN BUT MAY HAVE ACTUALLYOCCURRED (EECIALLY FOR MAX TEMPERATURE) ON THE PREVIOUS DAY.STATION PREVIOUS NEW RECORDS RECORD/YEAR RECORD BEGAN*CONDON, OR 20 / 1966 20 (TIED) 1928*MITCHELL, OR 20 / 1966 20 (TIED) 1949REDMOND, OR 13 / 1964 13 (TIED) 1949 :SINCE MID

SUN APR 20 2008NOTE: STATIONS MARKED WITH * INDICATE THAT THE STATION REPORTS ONCEPER DAY. FOR CONSISTENCY, THESE VALUES ARE CONSIDERED TO HAVEOCCURRED ON THE DAY THE OBSERVATION WAS TAKEN BUT MAY HAVE ACTUALLYOCCURRED (EECIALLY FOR MAX TEMPERATURE) ON THE PREVIOUS DAY.STATION PREVIOUS NEW RECORDS RECORD/YEAR RECORD BEGAN*CONDON, OR 21 / 1952 18 1928*LONG CREEK, OR 20 / 1982 20 (TIED) 1957MEACHAM, OR 22 / 1975 22 (TIED) 1948 :SINCE MID

MON APR 21 2008NOTE: STATIONS MARKED WITH * INDICATE THAT THE STATION REPORTS ONCEPER DAY. FOR CONSISTENCY, THESE VALUES ARE CONSIDERED TO HAVEOCCURRED ON THE DAY THE OBSERVATION WAS TAKEN BUT MAY HAVE ACTUALLYOCCURRED (EECIALLY FOR MAX TEMPERATURE) ON THE PREVIOUS DAY.STATION PREVIOUS NEW RECORDS RECORD/YEAR RECORD BEGAN*JOSEPH, OR 15 / 1951 15 (TIED) 1893*LA GRANDE(CITY), OR 25 / 1982 19 1948*MADRAS 2N, OR 24 / 1995 24 (TIED) 1952

TUE APR 22 2008NOTE: STATIONS MARKED WITH * INDICATE THAT THE STATION REPORTS ONCEPER DAY. FOR CONSISTENCY, THESE VALUES ARE CONSIDERED TO HAVEOCCURRED ON THE DAY THE OBSERVATION WAS TAKEN BUT MAY HAVE ACTUALLYOCCURRED (EECIALLY FOR MAX TEMPERATURE) ON THE PREVIOUS DAY.STATION PREVIOUS NEW RECORDS RECORD/YEAR RECORD BEGAN*MITCHELL, OR 23 / 1968 19 1949

SAT APR 26 2008NOTE: STATIONS MARKED WITH * INDICATE THAT THE STATION REPORTS ONCEPER DAY. FOR CONSISTENCY, THESE VALUES ARE CONSIDERED TO HAVEOCCURRED ON THE DAY THE OBSERVATION WAS TAKEN BUT MAY HAVE ACTUALLYOCCURRED (EECIALLY FOR MAX TEMPERATURE) ON THE PREVIOUS DAY.STATION PREVIOUS NEW RECORDS RECORD/YEAR RECORD BEGAN*HERMISTON 2NW, OR 29 / 1969 28 1928MEACHAM, OR 19 / 1970 17 1948 :SINCE MIDPENDLETON(ARPT), OR 30 / 1970 28 1934 :SINCE MID

MON APR 28 2008NOTE: STATIONS MARKED WITH * INDICATE THAT THE STATION REPORTS ONCEPER DAY. FOR CONSISTENCY, THESE VALUES ARE CONSIDERED TO HAVEOCCURRED ON THE DAY THE OBSERVATION WAS TAKEN BUT MAY HAVE ACTUALLYOCCURRED (EECIALLY FOR MAX TEMPERATURE) ON THE PREVIOUS DAY.STATION PREVIOUS NEW RECORDS RECORD/YEAR RECORD BEGAN*MONUMENT 2, OR 25 / 1984 24 1961

TUE APR 08 2008 A RECORD LOW TEMPERATURE OF 0 DEGREES WAS SET AT STANLEY TODAY. THIS BREAKS THE OLD RECORD OF 2 SET IN 1973.1240 PM MDT WED APR 16 2008TODAYS LOW TEMPERATURE OF 18 AT CHALLIS TIED THE RECORD SET IN 1982.

MON APR 21 2008 TODAYS LOW TEMPERATURE OF 12 AT CHALLIS BREAKS OLD RECORD OF 20 SET IN 1985. TODAYS LOW TEMPERATURE OF 15 AT POCATELLO BREAKS OLD RECORD OF 18 SET IN 1982.

WED APR 23 2008 A RECORD LOW TEMPERATURE OF 21 DEGREES WAS SET AT POCATELLO YESTERDAY. THIS BREAKS THE OLD RECORD OF 23 SET IN 1982. A RECORD LOW TEMPERATURE OF 19 DEGREES WAS SET AT BURLEY YESTERDAY. THIS TIES THE OLD RECORD OF 19 SET IN 1968.

SAT APR 26 2008 A RECORD LOW TEMPERATURE OF 16 DEGREES WAS SET AT POCATELLO TODAY. THIS BREAKS THE OLD RECORD OF 23 SET IN 1945.

SAT APR 26 2008 A RECORD LOW TEMPERATURE OF 21 DEGREES WAS SET AT IDAHO FALLS TODAY. THIS BREAKS THE OLD RECORD OF 22 SET IN 1972.

SAT APR 26 2008 A RECORD LOW TEMPERATURE OF 22 DEGREES WAS SET AT BURLEY TODAY. THIS BREAKS THE OLD RECORD OF 24 SET IN 1983.

SAT APR 26 2008 A RECORD LOW TEMPERATURE OF 18 DEGREES WAS SET AT CHALLIS TODAY. THIS BREAKS THE OLD RECORD OF 19 SET IN 1948.

SAT APR 26 2008 A RECORD LOW TEMPERATURE OF 6 DEGREES WAS SET AT STANLEY TODAY. THIS BREAKS THE OLD RECORD OF 13 SET IN 1985.

SUN APR 27 2008 A RECORD LOW TEMPERATURE OF 16 DEGREES WAS SET AT POCATELLO YESTERDAY. THIS BREAKS THE OLD RECORD OF 23 SET IN 1945. A RECORD LOW TEMPERATURE OF 22 DEGREES WAS SET AT BURLEY YESTERDAY. THIS BREAKS THE OLD RECORD OF 24 SET IN 1983. A RECORD LOW TEMPERATURE OF 18 DEGREES WAS SET AT CHALLIS YESTERDAY. THIS BREAKS THE OLD RECORD OF 19 SET IN 1948.

SUN APR 27 2008 A RECORD LOW TEMPERATURE OF 22 DEGREES WAS SET AT CHALLIS TODAY. THIS TIES THE OLD RECORD OF 22 SET IN 1955.

SUN APR 27 2008 A RECORD LOW TEMPERATURE OF 11 DEGREES WAS SET AT STANLEY TODAY. THIS TIES THE OLD RECORD OF 11 SET IN 1983.

SUN APR 27 2008 A RECORD LOW TEMPERATURE OF 22 DEGREES WAS SET AT THE POCATELLO AIRPORT THIS MORNING AND BREAKS THE OLD RECORD OF 24 SET IN 1972.BURLEY AIRPORT ALSO RECORDED A RECORD LOW TEMPERATURE OF 24 DEGREES THIS MORNING AND BREAKS THE OLD RECORD OF 26 SET IN 1972.AIRPORTS, THIS MORNING, CHALLIS AIRPORT RECORDED A LOW OF 22 DEGREES, TYING THE PREVIOUS RECORD SET IN 1955.

SAT APR 12 2008CLEAR SKIES AND OFFSHORE FLOW SET THE STAGE FOR A FEW RECORD HIGH TEMPERATURES TO BE ECLIPSED THIS AFTERNOON. THE FOLLOWING TABLE SUMMARIZES THESE.THESE ARE THE NEW RECORD HIGHS FOR APRIL 12.LOCATION HIGH ON SAT AFTN PREVIOUS RECORD ASTORIA, , , , , . 77 (TIED) 77 IN 1940EUGENE, , , , , .. 84 82 IN 1951

WED APR 09 2008 A RECORD LOW TEMPERATURE OF 35 DEGREES WAS TIED AT SEATTLE WFO ON APR 8TH. THE OLD RECORD OF 35 SET WAS LAST SET IN 1992.

THU APR 12 2008, RECORD HIGH TEMPERATURES TIED OR BROKEN ON SATURDAY APRIL 12TH, APRIL 12TH OLD RECORDSEA TAC 79 77 1951OLYMPIA 82 82 1951HOQUIAM 78 78 1980WFO SEATTLE 79 68 1991

MON APR 14 2008 A RECORD RAINFALL OF 0.33 INCH(ES) WAS SET AT SEATTLE WFO TODAY. THIS BREAKS THE OLD RECORD OF 0.22 SET IN 1997.

FRI APR 18 2008 A RECORD LOW TEMPERATURE OF 36 DEGREES WAS SET AT SEATTLE WFO TODAY. THIS BREAKS THE OLD RECORD OF 37 SET IN 2006. A RECORD RAINFALL OF 0.22 INCHES WAS SET AT SEATTLE WFO TODAY. THIS BREAKS THE OLD RECORD OF 0.20 SET IN 2007.

SAT APR 19 2008 A RECORD LOW TEMPERATURE OF 36 DEGREES WAS SET AT SEATTLE WFO TODAY. THIS BREAKS THE OLD RECORD OF 37 SET IN 1987. A RECORD SNOWFALL OF A TRACE WAS SET AT SEATTLE TACOMA AIRPORT TODAY. THIS TIES THE OLD RECORD OF A TRACE SET IN 1985. A RECORD SNOWFALL OF A TRACE WAS SET AT OLYMPIA AIRPORT TODAY. THIS TIES THE OLD RECORD OF A TRACE SET IN 1985.

SUN APR 20 2008RECORD LOW MAXIMUM TEMPERATURES SET ON APRIL 20TH 2008LOCATION NEW RECORD OLD RECORDSEA TAC 48 49 1967,1970 WFO SEATTLE 47 56 2002 OLYMPIA 44 50 1972 BELLINGHAM 47 49 1972 A RECORD SNOWFALL OF TRACE INCH(ES) WAS SET AT OLYMPIA AIRPORT TODAY. THIS TIES THE OLD RECORD OF TRACE SET IN 1960.

TUE APR 22 2008LOCATION NEW RECORD OLD RECORDHOQUIAM 47 47 IN 1960, 1972 OLYMPIA 50 50 IN 1961 A RECORD LOW TEMPERATURE OF 36 DEGREES WAS SET AT SEATTLE WFO ON APRIL 21ST. THIS BREAKS THE OLD RECORD OF 38 SET IN 2001.

TUE APR 22 2008 A RECORD LOW TEMPERATURE OF 29 DEGREES WAS SET AT BELLINGHAM AIRPORT. THIS TIES THE OLD RECORD OF 31 SET IN 1960 AND 1968. A RECORD LOW TEMPERATURE OF 37 DEGREES WAS SET AT SEATTLE WFO TODAY. THIS TIES THE OLD RECORD OF 37 SET IN 2006.

SAT APR 26 2008 A RECORD LOW TEMPERATURE OF 27 DEGREES WAS SET AT OLYMPIA AIRPORT TODAY. THIS TIES THE OLD RECORD OF 27 SET IN 1984. A RECORD LOW TEMPERATURE OF 37 DEGREES WAS SET AT SEATTLE WFO TODAY. THIS BREAKS THE OLD RECORD OF 38 SET IN 1988.

Snow Summary - Because of the cool April conditions this Spring, snowmelt has been delayed. Only the low elevation snowpacks have been depleted.Retention of the snowpack has produced above average snow water equivalentson May 1st. The best May 1st smow conditions are on the Bitterroot riverin Montana, The lower Clark Fork river, the northern Idaho area, the YakimaRiver in Washington and on Blue mountain streams in Northeast Oregon at140 to 160 percent. Other eastside areas have average to slighty aboveaverage May 1st snow water equivalents.

Streamflow Summary - The lack of an April snowmelt contribution has kept streamflows for April well below average at 40 to 60 percent of averagefor most basins. Only the Weiser river in central Idaho, the Owyhee riverin southeast Oregon and the Blue Mountain tributaries in northeast Oregonhad average streamflows due to low elevation melt. April streamflow onthe Columbia river at The Dalles was at 50 percent.

The forecast streamflows for the April through September and April throughJuly periods has dropped 2 to 5 percent from April 1st forecasts. Nearto slightly above average streamflows are expected in all areas. The best Spring streamflow at 120 percent of average are forecast onthe Spokane and Yakima rivers. Streamflow this Spring west of the Cascadeswill be above average at 100 to 120 percent. http://www.nwrfc.noaa.gov/water_supply/ws_fcst.cgi has detailed water supply forecasts.

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US Dept of Commerce National Oceanic and Atmospheric Administration National Weather Service Northwest River Forecast Center (NWRFC) 5241 NE 122nd Avenue Portland, Oregon 97230-1089 Telephone: 503-326-7401 Last Modified: December 8, 2005

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