Water Supply Precipitation Summary

Weekly Divisional Precipitation Summary

Click on date to display a different weekly forecast:

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 sep 1 - 15, 2008) 

  DIVISION               ..SEP TO DAY 15..   ....OCT - SEP.... 
                          OBSD  DEP  PCT AV    OBSD   DEP  PCT AV 

 COLUMBIA ABOVE COULEE   0.30  -0.50  37.    24.09  -0.71  97. 
 SNAKE RV AB ICE HARBOR  0.03  -0.50   6.    16.03  -1.38  92. 
 COLUMBIA AB THE DALLES  0.13  -0.52  20.    21.70  -1.07  95. 
 COLUMBIA AB CASTLEGAR   0.46  -0.66  41.    33.75   0.06 100. 
 KOOTENAI                0.19  -0.62  23.    22.44  -2.98  88. 
 CLARK FORK              0.36  -0.25  60.    18.11   0.81 105. 
 FLATHEAD                0.34  -0.47  42.    22.31  -0.55  98. 
 PEND OREILLE/ SPOKANE   0.04  -0.71   5.    30.10  -0.54  98. 
 NORTHEAST WASHINGTON    0.01  -0.50   3.    16.05  -3.32  83. 
 OKANOGAN                0.02  -0.47   5.    14.49  -1.34  92. 
 EAST SLOPES WASH CASC.  0.00  -0.69   0.    33.83  -5.00  87. 
 CENTRAL WASHINGTON      0.00  -0.22   0.     6.17  -2.76  69. 
 UPPER SNAKE             0.12  -0.60  17.    21.11   0.60 103. 
 SNAKE RIVER PLAIN       0.02  -0.40   4.     8.27  -2.92  74. 
 OWYHEE/ MALHEUR         0.00  -0.30   0.     8.67  -2.27  79. 
 SALMON/ BOISE/ PAYETTE  0.00  -0.51   1.    18.75  -0.89  95. 
 BURNT/ GRANDE RONDE     0.00  -0.41   0.    15.55  -0.48  97. 
 CLEARWATER              0.02  -0.83   2.    29.75  -0.54  98. 
 SOUTHEAST WASHINGTON    0.01  -0.46   2.    15.58  -3.73  81. 
 UPPER JOHN DAY          0.00  -0.35   0.    13.30  -1.29  91. 
 UMATILLA/ LWR JOHN DAY  0.00  -0.38   0.    17.76   1.70 111. 
 UPR DESCHUTES/ CROOKED  0.00  -0.29   0.    12.95  -1.43  90. 
 HOOD/ LOWER DESCHUTES   0.00  -0.58   0.    31.00   2.87 110. 
 NW SLOPE WASH CASCADES  0.00  -1.98   0.    78.98  -7.30  92. 
 SW WA CASCADES/COWLITZ  0.00  -1.55   0.    63.94  -6.12  91. 
 WILLAMETTE VALLEY       0.00  -1.07   0.    58.59  -0.27 100. 
 ROGUE/ UMPQUA           0.00  -0.58   0.    34.75  -0.59  98. 
 KLAMATH BASIN           0.00  -0.34   0.    16.93  -1.35  93. 
 LAKE COUNTY-GOOSE LAKE  0.00  -0.34   0.     9.13  -3.43  73. 
 HARNEY/ MALHEUR BASIN   0.00  -0.31   0.     8.71  -2.63  77. 

 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:

8/2008 7/2008 6/2008 5/2008 4/2008 3/2008 2/2008 1/2008 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 13/0606

 Columbia Basin Seasonal Precipitation Division Averages  
 Northwest River Forecast Center 


 (Monthly Summary -  20)  

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

 COLUMBIA ABOVE COULEE   2.38   0.69 141.    23.79  -0.20  99. 
 SNAKE RV AB ICE HARBOR  0.64  -0.22  75.    16.00  -0.88  95. 
 COLUMBIA AB THE DALLES  1.39   0.20 117.    21.57  -0.55  98. 
 COLUMBIA AB CASTLEGAR   3.84   1.41 158.    33.29   0.73 102. 
 KOOTENAI                2.44   0.75 145.    22.25  -2.36  90. 
 CLARK FORK              1.76   0.46 135.    17.75   1.05 106. 
 FLATHEAD                1.73   0.12 108.    21.97  -0.07 100. 
 PEND OREILLE/ SPOKANE   1.87   0.60 147.    30.06   0.17 101. 
 NORTHEAST WASHINGTON    1.44   0.35 132.    16.04  -2.82  85. 
 OKANOGAN                2.13   1.02 192.    14.47  -0.87  94. 
 EAST SLOPES WASH CASC.  0.94   0.15 119.    33.83  -4.31  89. 
 CENTRAL WASHINGTON      0.38   0.00  99.     6.19  -2.52  71. 
 UPPER SNAKE             0.80  -0.54  60.    20.99   1.21 106. 
 SNAKE RIVER PLAIN       0.30  -0.28  52.     8.25  -2.52  77. 
 OWYHEE/ MALHEUR         0.18  -0.27  40.     8.67  -1.97  81. 
 SALMON/ BOISE/ PAYETTE  0.39  -0.31  55.    18.74  -0.39  98. 
 BURNT/ GRANDE RONDE     0.84   0.03 104.    15.55  -0.07 100. 
 CLEARWATER              2.09   0.89 174.    29.74   0.29 101. 
 SOUTHEAST WASHINGTON    0.97   0.13 115.    15.57  -3.27  83. 
 UPPER JOHN DAY          0.46  -0.33  58.    13.30  -0.93  93. 
 UMATILLA/ LWR JOHN DAY  0.72   0.07 111.    17.76   2.08 113. 
 UPR DESCHUTES/ CROOKED  0.51  -0.13  80.    12.95  -1.14  92. 
 HOOD/ LOWER DESCHUTES   0.80   0.18 130.    31.00   3.45 113. 
 NW SLOPE WASH CASCADES  5.00   2.91 239.    78.98  -5.32  94. 
 SW WA CASCADES/COWLITZ  2.84   1.30 184.    63.94  -4.56  93. 
 WILLAMETTE VALLEY       1.37   0.30 128.    58.59   0.80 101. 
 ROGUE/ UMPQUA           0.21  -0.50  30.    34.75  -0.01 100. 
 KLAMATH BASIN           0.27  -0.34  44.    16.93  -1.00  94. 
 LAKE COUNTY-GOOSE LAKE  0.15  -0.37  29.     9.13  -3.09  75. 
 HARNEY/ MALHEUR BASIN   0.24  -0.35  41.     8.71  -2.33  79. 

 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 !
 
Aug 08 
 

 

 
WEATHER SUMMARY !
 

 
A MAINLY PROGRESSIVE UPPER LEVEL FLOW BROUGHT NEAR TO SLIGHTLY ABOVE NORMAL 
 
TEMPERATURES TO THE NORTHWEST DURING AUGUST. SURFACE HIGH PRESSURE OVER 
 
THE INLAND NORTHWEST HELPED KEEP THE NORTHERN ROCKIES AND INTERMOUNTAN 
 
PARTS OF WASHINGTON AND OREGON DRY...WHILE BRINGING MONSOONAL MOISTURE 
 
FROM THE SOUTHWEST UP TO THE CASCADES AND COASTAL AREAS. DURING MID MONTH
 
...THIS HIGH PRESSURE CENTER GREW ABNORMALLY STRONG...AND HELPED TO BREAK
 
HIGH TEMPERATURE RECORDS OVER MUCH OF THE NORTHWEST.
 

 
PRECIPITATION SUMMARY ! 
 

 
Seasonal (October through August) precipitation was: 99 percent of normal
 
(1971-2000) at Columbia above Coulee, 95 percent of normal at the 
 
Snake River above Ice Harbor, and 97 percent of normal at Columbia above the Dalles.
 
 
 

 
TEMPERATURE SUMMARY
 
 
 
The 31 station temperature index for the Pacific Northwest departed
 
 +1.5 degrees from normal relative to the 1971-2000 normals.  Mean
 
temperature departures ranged from -2.9 to 7.5 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.
 
  
 
RECORD LOW MINIMUM TEMPERATURES  - AUGUST
 

 
10 MEACHAM OR                   34 DEGREES F
 
   REDMOND OR                   37
 
  
 
12 STANLEY ID                   29
 
   WENATCHEE WA                 45
 

 
RECORD HIGH MINIMUM TEMPERATURES - AUGUST
 

 
15 SEATTLE-TACOMA AIRPORT WA    65 DEGREES F
 
   STAMPEDE PASS                67 
 
   SALEM OR                     64
 
   
 
16 SEATTLE-TACOMA AIRPORT WA    63
 
   STAMPEDE PASS                73 
 
   PORTLAND AIRPORT OR          68
 
   MEDFORD OR                   70
 
   
 
17 SEATTLE-TACOMA AIRPORT WA    67
 
   VANCOUVER WA                 72
 
   SALEM OR                     67
 
   EPHRATA AIRPORT WA           70
 
   MULLAN PASS ID               69
 
    
 
18 MOSES LAKE AIRPORT WA        65
 
   WINTHROP WA                  66
 
   
 
RECORD LOW MAXIMUM TEMPERATURES  - AUGUST
 

 
22 COEUR D ALENE ID             60
 
   
 
RECORD HIGH MAXIMUM TEMPERATURES - AUGUST
 

 
14 PORTLAND AIRPORT OR         102 DEGREES F
 
   MEDFORD OR                  108
 
   
 
15 THE DALLES OR               106
 
   MOSES LAKE WA               103
 
   MEDFORD OR                  108
 
16 VANCOUVER WA                101
 
   REDMOND OR                  106
 
   THE DALLES OR               109
 
   WALLA WALLA WA              106
 
   CHIEF JOSEPH DAM WA         106
 
   OMAK WA                     105
 
   BURNS OR                     97
 
   
 
17 PENDLETON OR                105
 
   YAKIMA WA                   101
 
   WENATCHEE AIRPORT WA        104
 
   BONNERS FERRY ID            101
 
   LEWISTON AIRPORT ID         108
 
   BAKER OR                     98
 

 
18 GRAND COULEE DAM WA         104
 
   MULLAN PASS                  86
 
   
 
19 MISSOULA MT                 100
 
   KALISPELL MT                 99
 
   
 
RECORD DAILY RAINFALL            - AUGUST
 

 
18 REDMOND OR                 0.78 INCHES
 

 
19 ASTORIA OR                 0.79
 
   TILLAMOOK OR               0.72
 

 
21 PORTHILL ID                1.05 
 
   MULLAN PASS ID             1.07
 

 

 

 

 

 

 

 

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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: May 17, 2007

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