Water Supply Precipitation Summary

Weekly Divisional Precipitation Summary

Click on date to display a different weekly forecast:

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 oct 1 - 26, 2009) 

  DIVISION               ..OCT TO DAY 26..   ....SEP - SEP.... 
                          OBSD  DEP  PCT AV    OBSD   DEP  PCT AV 

 COLUMBIA ABOVE COULEE   2.49   0.94 161.     0.82  -0.79  51. 
 SNAKE RV AB ICE HARBOR  1.60   0.60 159.     0.26  -0.80  25. 
 COLUMBIA AB THE DALLES  2.33   0.94 167.     0.62  -0.68  47. 
 COLUMBIA AB CASTLEGAR   3.72   1.37 158.     1.98  -0.27  88. 
 KOOTENAI                2.90   1.35 187.     0.83  -0.79  52. 
 CLARK FORK              1.31   0.32 133.     0.34  -0.87  28. 
 FLATHEAD                1.99   0.58 141.     0.36  -1.27  22. 
 PEND OREILLE/ SPOKANE   3.12   1.32 174.     0.40  -1.10  27. 
 NORTHEAST WASHINGTON    1.89   0.93 196.     0.50  -0.53  49. 
 OKANOGAN                1.94   1.09 229.     0.85  -0.13  87. 
 EAST SLOPES WASH CASC.  3.51   1.17 150.     1.15  -0.23  83. 
 CENTRAL WASHINGTON      0.89   0.37 173.     0.23  -0.21  53. 
 UPPER SNAKE             1.62   0.35 128.     0.58  -0.87  40. 
 SNAKE RIVER PLAIN       1.28   0.55 177.     0.35  -0.49  42. 
 OWYHEE/ MALHEUR         1.06   0.44 171.     0.08  -0.52  13. 
 SALMON/ BOISE/ PAYETTE  2.05   1.01 197.     0.11  -0.91  11. 
 BURNT/ GRANDE RONDE     1.71   0.83 194.     0.02  -0.80   3. 
 CLEARWATER              1.75  -0.07  96.     0.22  -1.48  13. 
 SOUTHEAST WASHINGTON    1.60   0.38 132.     0.12  -0.81  13. 
 UPPER JOHN DAY          1.33   0.53 165.     0.03  -0.68   5. 
 UMATILLA/ LWR JOHN DAY  1.86   0.88 190.     0.10  -0.66  13. 
 UPR DESCHUTES/ CROOKED  1.65   0.88 214.     0.02  -0.57   4. 
 HOOD/ LOWER DESCHUTES   2.35   0.62 136.     0.85  -0.31  73. 
 NW SLOPE WASH CASCADES  9.74   3.57 158.     3.74  -0.21  95. 
 SW WA CASCADES/COWLITZ  5.56   0.92 120.     2.35  -0.76  76. 
 WILLAMETTE VALLEY       4.00   0.41 111.     1.37  -0.76  64. 
 ROGUE/ UMPQUA           2.69   0.54 125.     0.47  -0.69  40. 
 KLAMATH BASIN           1.35   0.39 140.     0.04  -0.65   6. 
 LAKE COUNTY-GOOSE LAKE  1.19   0.47 166.     0.02  -0.66   3. 
 HARNEY/ MALHEUR BASIN   1.03   0.37 155.     0.09  -0.52  15. 

 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:

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 - OCT 2009) 


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

 COLUMBIA ABOVE COULEE   3.04   1.19 164.     0.82  -0.79  51. 
 SNAKE RV AB ICE HARBOR  1.85   0.65 154.     0.26  -0.80  25. 
 COLUMBIA AB THE DALLES  2.82   1.16 170.     0.62  -0.68  47. 
 COLUMBIA AB CASTLEGAR   4.63   1.83 165.     1.98  -0.27  88. 
 KOOTENAI                3.24   1.39 175.     0.83  -0.79  52. 
 CLARK FORK              1.72   0.54 145.     0.34  -0.87  28. 
 FLATHEAD                2.55   0.87 152.     0.36  -1.27  22. 
 PEND OREILLE/ SPOKANE   3.45   1.31 161.     0.40  -1.10  27. 
 NORTHEAST WASHINGTON    2.08   0.93 181.     0.50  -0.53  49. 
 OKANOGAN                1.79   0.78 177.     0.85  -0.13  87. 
 EAST SLOPES WASH CASC.  4.68   1.89 168.     1.15  -0.23  83. 
 CENTRAL WASHINGTON      1.05   0.44 172.     0.23  -0.21  53. 
 UPPER SNAKE             2.21   0.70 147.     0.58  -0.87  40. 
 SNAKE RIVER PLAIN       1.34   0.48 156.     0.35  -0.49  42. 
 OWYHEE/ MALHEUR         1.28   0.54 173.     0.08  -0.52  13. 
 SALMON/ BOISE/ PAYETTE  2.40   1.16 193.     0.11  -0.91  11. 
 BURNT/ GRANDE RONDE     1.71   0.66 163.     0.02  -0.80   3. 
 CLEARWATER              2.29   0.12 105.     0.22  -1.48  13. 
 SOUTHEAST WASHINGTON    1.97   0.52 136.     0.12  -0.81  13. 
 UPPER JOHN DAY          1.73   0.77 181.     0.03  -0.68   5. 
 UMATILLA/ LWR JOHN DAY  1.95   0.78 166.     0.10  -0.66  13. 
 UPR DESCHUTES/ CROOKED  1.85   0.93 202.     0.02  -0.57   4. 
 HOOD/ LOWER DESCHUTES   3.29   1.23 160.     0.85  -0.31  73. 
 NW SLOPE WASH CASCADES 12.60   5.24 171.     3.74  -0.21  95. 
 SW WA CASCADES/COWLITZ  7.29   1.76 132.     2.35  -0.76  76. 
 WILLAMETTE VALLEY       5.69   1.40 133.     1.37  -0.76  64. 
 ROGUE/ UMPQUA           3.20   0.64 125.     0.47  -0.69  40. 
 KLAMATH BASIN           1.47   0.32 128.     0.04  -0.65   6. 
 LAKE COUNTY-GOOSE LAKE  1.10   0.25 130.     0.02  -0.66   3. 
 HARNEY/ MALHEUR BASIN   1.34   0.55 169.     0.09  -0.52  15. 

 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
 
OCT 09 
 

 
WEATHER SUMMARY 
 
PROGRESSIVE COLD WEATHER SYSTEMS BROUGHT CHILLY TEMPERATURES 
 
AND COPIOUS RAIN AND SNOW TO THE COLUMBIA BASIN DURING THE
 
FIRST HALF OF OCTOBER. DURING THE FIRST WEEK...COLD 
 
TEMPERATURES STAYED MAINLY EAST OF THE CASCADE MOUNTAINS...
 
BUT MOVED INTO THE ENTIRE REGION BY THE SECOND WEEK AS A 
 
ARCTIC FRONT MOVED THROUGH FROM THE NORTH. HIGH PRESSURE 
 
BROUGHT SOME RELIEF TO THE NORTHWEST AT THE BEGINNING OF THE 
 
THIRD WEEK...BUT THIS WAS SHORT LIVED. BY MID MONTH...A 
 
STRONG WARM SYSTEM BROUGHT ANOTHER SIGNIFICANT RAINFALL TO 
 
THE NORTHWEST U.S. AND SOUTHERN BRITISH COLUMBIA. PROGRESSIVE 
 
UPPER LEVEL FLOW BROUGHT A SERIES OF COLD FRONTAL SYSTEMS INTO 
 
THE REGION THROUGH THE THIRD AND FOURTH WEEKS. 
 

 
PRECIPITATION SUMMARY 
 

 
SEPTEMBER PRECIPITATION WAS: 114 PERCENT OF NORMAL (1971-2000) AT COLUMBIA ABOVE
 
COULEE, 181 PERCENT OF NORMAL AT THE SNAKE RIVER ABOVE ICE HARBOR, AND 131 
 
PERCENT OF NORMAL AT COLUMBIA ABOVE THE DALLES.
 

 
SEASONAL (OCTOBER THROUGH SEPTEMBER) PRECIPITATION WAS: 51 PERCENT OF NORMAL
 
(1971-2000) AT COLUMBIA ABOVE COULEE, 25 PERCENT OF NORMAL AT THE SNAKE RIVER
 
ABOVE ICE HARBOR, AND 47 PERCENT OF NORMAL AT COLUMBIA ABOVE THE DALLES.
 

 
TEMPERATURE SUMMARY
 
 
 
THE 37 STATION TEMPERATURE INDEX FOR THE PACIFIC NORTHWEST DEPARTED
 
 +0.7 DEGREES FROM NORMAL RELATIVE TO THE 1971-2000 NORMALS.  MEAN
 
TEMPERATURE DEPARTURES RANGED FROM -1.3 TO 2.7 DEGREES.
 

 
 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.
 
  
 

 
10/01 	A RECORD LOW TEMPERATURE OF 16 DEGREES WAS SET AT BURNS OR.
 

 
10/02 	A RECORD LOW TEMPERATURE OF 23 DEGREES WAS SET AT POCATELLO ID.
 

 
10/04	A RECORD RAINFALL FO 0.42 INCHES WAS SET AT PENDLETON OR.
 

 
10/06	A RECORD LOW TEMPERATURE OF 29 DEGREES WAS SET AT EUGENE OR.
 

 
10/08	A RECORD LOW TEMPERATURE OF 21 DEGREES WAS SET AT PULLMAN WA.
 
	A RECORD LOW TEMPERATURE OF 14 DEGREES WAS SET AT KALISPELL MT.
 

 
10/09	A RECORD LOW TEMPERATURE OF 10 DEGREES WAS SET AT KALISPELL MT.
 
	A RECORD SNOWFALL OF 1 INCH WAS SET AT MISSOULA MT TODAY
 

 
10/10	A RECORD LOW TEMPERATURE OF 10 DEGREES WAS SET AT MISSOULA MT.
 
 	A RECORD LOW TEMPERATURE OF 5 DEGREES WAS SET AT KALISPELL MT.
 
 	A RECORD LOW TEMPERATURE OF 23 DEGREES WAS SET AT SPOKANE WA.
 
	A RECORD LOW TEMPERATURE OF 11 DEGREES WAS SET AT PULLMAN WA.
 
	A RECORD LOW TEMPERATURE OF 19 DEGREES WAS SET AT COEUR D'ALENE ID.
 
	
 
10/11	A RECORD LOW TEMPERATURE OF 28 DEGREES WAS SET AT OLYMPIA WA.
 
	A RECORD LOW TEMPERATURE OF 17 DEGREES WAS SET AT MOSES LAKE WA.
 
	A RECORD LOW TEMPERATURE OF 8 DEGREES WAS SET AT PULLMAN WA.
 
	A RECORD LOW TEMPERATURE OF 20 DEGREES WAS SET AT SPOKANE WA.
 
	A RECORD LOW TEMPERATURE OF 23 DEGREES WAS SET AT WENATCHEE WA
 
	A RECORD LOW TEMPERATURE OF 11 DEGREES WAS SET AT MISSOULA MT.
 
	A RECORD LOW TEMPERATURE OF 11 DEGREES WAS SET AT BUTTE MT.
 
	A RECORD LOW TEMPERATURE OF 6 DEGREES WAS SET AT KALISPELL MT.
 
	A RECORD LOW TEMPERATURE OF 21 DEGREES WAS SET AT PENDLETON OR.
 
	A RECORD LOW TEMPERATURE OF 26 DEGREES WAS SET AT WALLA WALLA WA.
 
 	A RECORD LOW TEMPERATURE OF 14 DEGREES WAS SET AT CHALLIS ID.
 

 
10/12	A RECORD LOW TEMPERATURE OF 25 DEGREES WAS SET AT BELLINGHAM WA.
 
	A RECORD LOW TEMPERATURE OF 8 DEGREES WAS SET AT MISSOULA MT.
 
	A RECORD LOW TEMPERATURE OF 2 DEGREES WAS SET AT KALISPELL MT.
 
	A RECORD LOW TEMPERATURE OF 6 DEGREES WAS SET AT BUTTE MT.
 
	A RECORD LOW TEMPERATURE OF 18 DEGREES WAS SET AT COEUR D'ALENE ID.
 
	A RECORD LOW TEMPERATURE OF 13 DEGREES WAS SET AT PULLMAN WA.	  
 
	A RECORD LOW TEMPERATURE OF 29 DEGREES WAS SET AT WENATCHEE WA.
 
 	A RECORD LOW TEMPERATURE OF 21 DEGREES WAS SET AT PENDLETON OR.
 
	
 
10/13	RECORD HIGH PRECIPIATION OF 0.28 INCHES WAS SET AT PENDLETON OR.	
 

 
10/14	A RECORD RAINFALL OF 0.49 INCHES WAS SET AT HILLSBORO OR.
 

 
10/17	A RECORD LOW TEMPERATURE OF 23 DEGREES WAS SET AT PULLMAN WA.
 
	A RECORD RAINFALL OF 1.24 INCHES WAS SET AT SEA-TAC WA.
 
	A RECORD RAINFALL OF 1.19 INCHES WAS SET AT OLYMPIA WA.
 

 
10/19	A RECORD RAINFALL OF 0.76 INCHES WAS SET AT BUTTE MT.
 

 
10/26 	A RECORD RAINFALL OF 1.17 INCHES WAS SET AT MULLAN PASS 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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