Water Supply Precipitation Summary

Weekly Divisional Precipitation Summary

Click on date to display a different weekly forecast:

02/09/2010 01/26/2010 01/19/2010 01/13/2010 12/30/2009 12/23/2009 12/15/2009 12/08/2009 11/24/2009 11/17/2009 11/10/2009 10/27/2009 10/20/2009 10/14/2009 09/29/2009 09/22/2009 09/15/2009 09/09/2009 09/01/2009 08/26/2009 08/19/2009 08/12/2009 07/28/2009 07/21/2009 07/14/2009 06/30/2009 06/27/2009 06/23/2009 06/16/2009 06/10/2009 05/26/2009 05/19/2009 05/12/2009 04/28/2009 04/22/2009 04/14/2009 03/31/2009 03/24/2009 03/17/2009 03/11/2009 02/24/2009 02/19/2009 02/10/2009 01/27/2009 01/20/2009 01/13/2009 12/31/2008 12/24/2008 12/16/2008 12/09/2008 11/25/2008 11/18/2008 11/12/2008 10/28/2008 10/21/2008 10/14/2008 10/07/2008 09/23/2008 09/16/2008 09/09/2008 08/26/2008 08/19/2008 08/12/2008 07/29/2008 07/22/2008 07/15/2008 06/24/2008 06/17/2008 06/10/2008 05/27/2008 05/20/2008 05/13/2008 04/29/2008 04/22/2008 04/15/2008 04/08/2008 03/25/2008 03/18/2008 03/12/2008 03/11/2008 02/26/2008 02/20/2008 02/19/2008 02/13/2008 02/12/2008 01/30/2008 01/29/2008 01/23/2008 01/22/2008 01/16/2008 01/08/2008 12/26/2007 12/18/2007 12/11/2007 11/27/2007 11/20/2007 11/13/2007 10/23/2007 10/16/2007 10/09/2007 09/25/2007 09/21/2007 09/11/2007 08/28/2007 08/21/2007 08/14/2007 07/24/2007 07/18/2007 07/17/2007 07/10/2007 06/26/2007 06/19/2007 06/12/2007 05/29/2007 05/23/2007 05/15/2007 05/08/2007 04/24/2007 04/17/2007 04/10/2007 03/27/2007 03/20/2007 03/13/2007 02/27/2007 02/20/2007 02/13/2007 01/23/2007 01/16/2007 01/09/2007 12/26/2006 12/19/2006 12/12/2006 11/28/2006 11/21/2006 11/14/2006 11/07/2006 10/24/2006 10/17/2006 10/12/2006 09/26/2006 09/19/2006 09/12/2006 08/29/2006 08/22/2006 08/16/2006 08/09/2006 07/25/2006 07/18/2006 07/11/2006 06/27/2006 06/20/2006 06/13/2006 05/30/2006 05/23/2006 05/16/2006 05/09/2006 04/18/2006 04/11/2006 03/28/2006 03/21/2006 03/14/2006 03/07/2006 02/21/2006 02/14/2006 02/08/2006 01/24/2006 12/13/2005 12/06/2005 11/29/2005 11/28/2005 11/22/2005 11/15/2005 08/09/2005 07/26/2005 07/19/2005 07/12/2005 06/14/2005 06/07/2005 05/24/2005 05/17/2005 05/11/2005 04/26/2005 04/19/2005 04/12/2005 03/29/2005 03/22/2005 03/15/2005 03/09/2005 02/23/2005 02/15/2005 02/08/2005 01/26/2005 01/19/2005 01/12/2005 12/28/2004 12/22/2004 12/16/2004 12/15/2004 12/08/2004 11/24/2004 11/17/2004 11/09/2004 10/27/2004 10/20/2004 10/13/2004 09/28/2004 09/21/2004 09/15/2004 09/08/2004 08/24/2004 08/17/2004 08/10/2004 07/27/2004 07/20/2004 07/15/2004 07/13/2004 06/29/2004 06/22/2004

 Columbia Basin Seasonal Precipitation Division Averages  
 Northwest River Forecast Center 


 (Weekly Summary: 12Z feb 1 - 08, 2010) 

  DIVISION               ..FEB TO DAY  8..   ....OCT - FEB.... 
                          OBSD  DEP  PCT AV    OBSD   DEP  PCT AV 

 COLUMBIA ABOVE COULEE   0.22  -0.35  39.     8.87  -2.16  80. 
 SNAKE RV AB ICE HARBOR  0.25  -0.21  53.     6.27  -1.22  84. 
 COLUMBIA AB THE DALLES  0.29  -0.31  49.     9.06  -1.81  83. 
 COLUMBIA AB CASTLEGAR   0.34  -0.47  42.    12.79  -3.15  80. 
 KOOTENAI                0.21  -0.34  39.     9.51  -1.92  83. 
 CLARK FORK              0.14  -0.23  38.     5.03  -1.83  73. 
 FLATHEAD                0.16  -0.34  32.     7.72  -1.57  83. 
 PEND OREILLE/ SPOKANE   0.38  -0.49  44.    11.70  -3.55  77. 
 NORTHEAST WASHINGTON    0.25  -0.21  54.     7.74  -0.32  96. 
 OKANOGAN                0.25  -0.14  64.     6.07  -0.81  88. 
 EAST SLOPES WASH CASC.  0.47  -0.94  33.    18.93  -5.71  77. 
 CENTRAL WASHINGTON      0.16  -0.09  64.     3.95  -0.51  88. 
 UPPER SNAKE             0.26  -0.24  52.     6.35  -2.00  76. 
 SNAKE RIVER PLAIN       0.14  -0.11  55.     3.64  -0.71  84. 
 OWYHEE/ MALHEUR         0.35   0.06 122.     4.62  -0.08  98. 
 SALMON/ BOISE/ PAYETTE  0.35  -0.24  59.     8.28  -1.08  88. 
 BURNT/ GRANDE RONDE     0.36  -0.04  90.     6.52  -0.70  90. 
 CLEARWATER              0.30  -0.52  37.    10.54  -3.22  77. 
 SOUTHEAST WASHINGTON    0.27  -0.28  49.     6.88  -2.29  75. 
 UPPER JOHN DAY          0.36   0.01 103.     6.15  -0.28  96. 
 UMATILLA/ LWR JOHN DAY  0.32  -0.13  72.     8.05   0.44 106. 
 UPR DESCHUTES/ CROOKED  0.41  -0.02  95.     7.59   0.09 101. 
 HOOD/ LOWER DESCHUTES   0.72  -0.26  74.    16.17  -0.21  99. 
 NW SLOPE WASH CASCADES  0.47  -2.32  17.    43.71  -6.11  88. 
 SW WA CASCADES/COWLITZ  0.91  -1.49  38.    33.41  -6.97  83. 
 WILLAMETTE VALLEY       1.11  -0.96  54.    27.52  -6.18  82. 
 ROGUE/ UMPQUA           0.84  -0.45  65.    16.77  -3.69  82. 
 KLAMATH BASIN           0.36  -0.25  59.     8.52  -1.57  84. 
 LAKE COUNTY-GOOSE LAKE  0.22  -0.13  64.     4.97  -0.51  91. 
 HARNEY/ MALHEUR BASIN   0.33   0.05 116.     5.00   0.25 105. 

 This precipitation summary for the Columbia River Basin is based on an 
 analysis using a limited number of reporting stations. Final values 
 depicted in this narrative are prorated by the number of elapsed days  
 in the month. 

 Precipitation normals are based on 1971-2000 historical data. 

 Please contact NWRFC for further information: (503) 326-7291. 
    

Monthly Divisional Precipitation Summary

Click on date to display forecast:

1/2010 1/2010 12/2009 11/2009 10/2009 9/2009 8/2009 7/2009 6/2009 5/2009 4/2009 3/2009 2/2009 1/2009 12/2008 11/2008 10/2008 9/2008 8/2008 7/2008 6/2008 5/2008 4/2008 3/2008 2/2008 1/2008 12/2007 11/2007 10/2007 9/2007 8/2007 7/2007 6/2007 5/2007 4/2007 3/2007 2/2007 2/2007 1/2007 12/2006 11/2006 10/2006 9/2006 8/2006 7/2006 6/2006 5/2006 4/2006 3/2006 2/2006 1/2006 11/2005 7/2005 6/2005 5/2005 4/2005 3/2005 2/2005 1/2005 12/2004 11/2004 10/2004 9/2004 8/2004 7/2004 6/2004

 Columbia Basin Seasonal Precipitation Division Averages  
 Northwest River Forecast Center 


 (Monthly Summary - jan 2010) 


  DIVISION               ..JAN TO DAY 31..   ....OCT - JAN.... 
                          OBSD  DEP  PCT AV    OBSD   DEP  PCT AV 

 COLUMBIA ABOVE COULEE   2.14  -0.57  79.     8.65  -1.81  83. 
 SNAKE RV AB ICE HARBOR  1.91  -0.07  96.     6.03  -1.00  86. 
 COLUMBIA AB THE DALLES  2.42  -0.37  87.     8.76  -1.50  85. 
 COLUMBIA AB CASTLEGAR   3.28  -0.73  82.    12.45  -2.68  82. 
 KOOTENAI                2.45  -0.32  88.     9.29  -1.58  85. 
 CLARK FORK              1.21  -0.57  68.     4.88  -1.60  75. 
 FLATHEAD                1.51  -0.74  67.     7.56  -1.23  86. 
 PEND OREILLE/ SPOKANE   2.65  -1.23  68.    11.32  -3.06  79. 
 NORTHEAST WASHINGTON    1.91   0.05 103.     7.49  -0.12  98. 
 OKANOGAN                1.74   0.01 100.     5.82  -0.67  90. 
 EAST SLOPES WASH CASC.  5.43  -1.26  81.    18.46  -4.77  79. 
 CENTRAL WASHINGTON      1.29   0.23 122.     3.79  -0.43  90. 
 UPPER SNAKE             1.87  -0.38  83.     6.09  -1.76  78. 
 SNAKE RIVER PLAIN       1.07  -0.07  94.     3.51  -0.59  86. 
 OWYHEE/ MALHEUR         1.41   0.16 113.     4.27  -0.15  97. 
 SALMON/ BOISE/ PAYETTE  2.59   0.10 104.     7.94  -0.83  90. 
 BURNT/ GRANDE RONDE     1.89   0.04 102.     6.16  -0.66  90. 
 CLEARWATER              2.97  -0.64  82.    10.24  -2.70  79. 
 SOUTHEAST WASHINGTON    1.76  -0.48  79.     6.61  -2.01  77. 
 UPPER JOHN DAY          1.80   0.19 112.     5.79  -0.29  95. 
 UMATILLA/ LWR JOHN DAY  2.47   0.55 129.     7.72   0.56 108. 
 UPR DESCHUTES/ CROOKED  2.51   0.41 120.     7.17   0.11 102. 
 HOOD/ LOWER DESCHUTES   4.60   0.28 106.    15.45   0.05 100. 
 NW SLOPE WASH CASCADES 10.84  -1.82  86.    43.23  -3.79  92. 
 SW WA CASCADES/COWLITZ  9.28  -1.04  90.    32.50  -5.48  86. 
 WILLAMETTE VALLEY       7.56  -1.02  88.    26.41  -5.22  84. 
 ROGUE/ UMPQUA           5.51   0.40 108.    15.93  -3.24  83. 
 KLAMATH BASIN           2.82   0.00 100.     8.15  -1.32  86. 
 LAKE COUNTY-GOOSE LAKE  1.53   0.11 108.     4.75  -0.39  92. 
 HARNEY/ MALHEUR BASIN   1.61   0.42 135.     4.68   0.21 105. 

 Columbia River Basin division values are computed by utilizing 
 un-weighted precipitation amounts from key stations in each area. 

 Precipitation normals are based on 1971-2000 historical data. 

 Please contact NWRFC for further information: (503) 326-7291. 
    
NORTHWEST RIVER FORECAST CENTER PORTLAND OR
 
PRECIPITATION, TEMPERATURE, SNOW, AND STREAMFLOW SUMMARIES
 
jan 10 
 

 

 
WEATHER SUMMARY 
 
A SERIES OF PACIFIC SYSTEMS BROUGHT HEAVY RAIN AND SNOW TO THE NORTHWEST DURING THE FIRST 
 
WEEK OF THE YEAR. BY THE SECOND WEEK OF JANUARY...A SPLIT UPPER LEVEL JET STREAM SET UP 
 
OVER THE WESTERN U.S. THIS ALONG WITH SOUTHERLY FLOW AT THE MID AND LOWER LEVELS KEPT
 
TEMPERATURES UNSEASONABLY WARM FOR MUCH OF THE REGION...AND PRECIPITATION MAINLY LIGHT. 
 

 

 
PRECIPITATION SUMMARY 
 

 
January precipitation was: 79 percent of normal (1971-2000) at Columbia above
 
Coulee, 96 percent of normal at the Snake River above Ice Harbor, and 87 
 
percent of normal at Columbia above the Dalles.
 

 

 
Seasonal (October through January) precipitation was: 83 percent of normal
 
(1971-2000) at Columbia above Coulee, 86 percent of normal at the Snake River
 
above Ice Harbor, and 85 percent of normal at Columbia above the Dalles.
 

 

 
 
 

 
TEMPERATURE SUMMARY
 
 
 
The 37 station temperature index for the Pacific Northwest departed
 
 +5.5 degrees from normal relative to the 1971-2000 normals.  Mean
 
temperature departures ranged from -0.2 to 8.0 degrees.
 

 
General Summary !
 

 
 The split flow pattern that impacted the Columbia-Snake basin in early Winter has been 
 
 replaced by a strong southerly jet which is directing storms into California.  Consequently
 
 Northern basin areas had below average January precipitation at 60 to 80 percent.  In the
 
 Southern reaches of the drainage January precipitation ranged from 85 to 120 percent.  Warm
 
 temperatures basinwide perevented the normal snow accumulations during January.  Lastly, it
 
 is clear that we are in an El Nino pattern. Floods in California and the Southwest US, dry warm 
 
 conditions in the Noerthwest and floods in Peru all indicate an El Nino year.  Because of 
 
 this condition and the NOAA Climate Center's dry forecast for February, a weight of 60 percent
 
 was applied to precipitation in the month of February.  This resulted in a sharp drop in
 
 expected Spring streamflow for all areas.
 

 
Snow Summary !
 

 
 Warm conditions during January prevented the normal snow accumulations over most of the  
 
 the Columbia-Snake basin.  February 1st snow water equivalents (SWE's) range from 80 to 90
 
 percent in Canada to 60 to 70 percent in much of the Snake River drainage.  Most of the basin
 
 has February 1st SWE's in the 65 to 80 percent range.  West of the Cascades February 1st SWE's
 
 are in the 50 to 70 percent range. 
 

 
Streamflow Summary !
 

 
 Streamflow in January was below average in the entire drainage area.  The Upper Columbia-
 
 Kootenai rivers and the Upper Snake river area had the best January streamflow at 80 to 90
 
 percent.  Most of the remaining basin area had streamflow at the 60 to 80 percent leve.
 
 Lowest January flows were found in the SE Oregon basins and in the Spokane basin in Idaho
 
 at 50 to 60 percent.
 
 
 
 Lower than average snow accumulations and a fairly dry January especially in northern areas
 
 coupled with an anticipated dry February due to El Nino conditions has produced sharp drops
 
 in the expected Spring streamflow.  On the average streamflow forecasts dropped around ten
 
 percent from the January 1st levels.  The forecast for the Columbia River at The Dalles
 
 has dropped to near the 70 percent of the 30-year average.
 
 See http://www.nwrfc.noaa.gov/water_supply/ws_fcst.cgi for detailed water supply forecasts.
 
 
 

 

 
 MONTHLY PRECIPITATION AND TEMPERATURE RECORDS 
 

 
  
 
Partial list of record high and low temperatures in degrees (F) are listed below.
 
Precipitation is reported in inches.
 
Please see the complete list of records at the National Weather Service Field
 
Offices Climatology Web pages.
 
  
 

 
01/01	RECORD HIGH TEMPERATURE OF 48 DEGREES WAS SET AT TWIN FALLS ID.
 
	RECORD SNOWFALL OF 6.4 INCHES WAS SET AT KALISPELL MT.
 
	RECORD RAINFALL OF 1.25 INCHES WAS SET AT PORTLAND OR.
 
	
 
01/02	RECORD SNOWFALL OF 18.0 INCHES WAS SET AT KALISPELL MT.
 

 
01/04	RECORD SNOWFALL OF 5.0 INCHES WAS SET AT RITZVILLE WA.
 
	RECORD RAINFALL OF 0.71 INCHES WAS SET AT SEATTLE WA.
 
	
 
01/05	RECORD SNOWFALL OF 7.5 INCHES WAS SET AT SPOKANE WA.
 

 
01/06	RECORD RAINFALL OF 1.22 INCHES WAS SET AT SEATTLE-TACOMA WA.
 
	RECORD HIGH TEMPERATURE OF 56 DEGREES WAS SET AT THE DALLES OR.
 

 
01/07	RECORD PRECIPITATION OF 1.47 INCHES WAS SET AT KELLOGG ID.
 
	RECORD RAINFALL OF 4.82 INCHES WAS SET AT OLYMPIA WA.
 
	RECORD RAINFALL OF 2.29 INCHES WAS SET AT SEATTLE-TACOMA W.
 
		
 
01/08	RECORD HIGH TEMPERATURE OF 67 DEGREES WAS SET AT THE DALLES OR.
 
	RECORD HIGH TEMPERATURE OF 46 DEGREES WAS SET AT IDAHO FALLS ID.
 

 
01/09	RECORD HIGH TEMPERATURE OF 57 DEGREES WAS SET AT OLYMPIA WA.
 

 
01/10	RECORD HIGH TEMPERATURE OF 57 DEGREES WAS SET AT QUILLAYUTE WA.
 
	RECORD RAINFALL OF 2.13 INCHES WAS SET AT QUILLAYUTE WA.
 

 
01/11	RECORD HIGH TEMPERATURE OF 61 DEGREES SET AT BELLINGHAM WA.
 
	RECORD RAINFALL OF 4.59 INCHES WAS SET AT QUILLAYUTE WA.
 
	RECORD HIGH TEMPERATURE OF 67 DEGREES WAS SET AT MEDFORD OR.
 

 
01/12	RECORD HIGH TEMPERATURE OF 62 DEGREES WAS SET AT THE DALLES OR.
 

 
01/14	RECORD RAINFALL OF 3.41 INCHES WAS SET AT QUILLAYUTE WA AIRPORT.
 

 
01/15	RECORD RAINFALL OF 2.27 INCHES WAS SET AT QUILLAYUTE WA.
 
	RECORD HIGH TEMPERATURE OF 59 DEGREES WAS SET AT MEDFORD OR.
 
	RECORD HIGH TEMPERATURE OF 52 DEGREES WAS SET AT PULLMAN WA.
 

 
01/16	RECORD HIGH TEMPERATURE OF 57 DEGREES WAS SET AT QUILLAYUTE WA.
 

 
01/17	RECORD HIGH TEMPERATURE OF 62 DEGREES WAS SET AT QUILLAYUTE WA.
 
	
 
01/18 	RECORD HIGH TEMPERATURE OF 49 DEGREES WAS SET AT MULLAN PASS ID.
 

 
01/19	RECORD HIGH TEMPERATURE OF 52 DEGREES WAS SET AT MULLAN PASS ID.
 

 
01/26	RECORD LOW TEMPERATURE OF -18 DEGREES WAS SET AT IDAHO FALLS ID.
 

 
01/27	RECORD LOW TEMPERATURE OF -29 DEGREES WAS SET AT IDAHO FALLS ID.
 
	RECORD LOW TEMPERATURE OF -10 DEGREES WAS SET AT POCATELLO ID.
 

 

 

 

 

 

 

 

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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: June 5, 2009

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