Columbia Basin Seasonal Precipitation Division Averages
Northwest River Forecast Center
(Weekly Summary: 12Z apr 1 - 08, 2013)
DIVISION ..APR TO DAY 8.. ....OCT - APR....
OBSD DEP PCT AV OBSD DEP PCT AV
COLUMBIA ABOVE COULEE 0.67 0.23 151. 16.72 2.03 114.
SNAKE RV AB ICE HARBOR 0.60 0.21 155. 10.22 -0.46 96.
COLUMBIA AB THE DALLES 0.72 0.29 165. 15.02 0.30 102.
COLUMBIA AB CASTLEGAR 0.87 0.34 164. 23.49 2.58 112.
KOOTENAI 0.75 0.28 161. 17.94 2.88 119.
CLARK FORK 0.37 0.04 112. 9.87 0.55 106.
FLATHEAD 0.47 0.05 112. 14.52 1.92 115.
PEND OREILLE/ SPOKANE 1.00 0.39 165. 20.95 0.15 101.
NORTHEAST WASHINGTON 0.79 0.38 195. 12.58 1.35 112.
OKANOGAN 0.60 0.32 217. 10.94 1.69 118.
EAST SLOPES WASH CASC. 1.14 0.57 201. 27.05 -5.13 84.
CENTRAL WASHINGTON 0.41 0.24 242. 6.19 0.11 102.
UPPER SNAKE 0.80 0.37 187. 11.71 -0.06 99.
SNAKE RIVER PLAIN 0.34 0.06 122. 5.12 -1.27 80.
OWYHEE/ MALHEUR 0.38 0.12 145. 5.97 -0.84 88.
SALMON/ BOISE/ PAYETTE 0.70 0.27 163. 11.82 -1.38 90.
BURNT/ GRANDE RONDE 0.38 0.02 104. 9.26 -0.71 93.
CLEARWATER 1.07 0.36 151. 19.27 -0.05 100.
SOUTHEAST WASHINGTON 0.65 0.21 147. 11.09 -1.83 86.
UPPER JOHN DAY 0.41 0.07 122. 8.44 -0.59 93.
UMATILLA/ LWR JOHN DAY 0.73 0.33 184. 10.87 0.12 101.
UPR DESCHUTES/ CROOKED 0.30 0.03 113. 10.43 0.21 102.
HOOD/ LOWER DESCHUTES 1.22 0.65 213. 23.10 1.01 105.
NW SLOPE WASH CASCADES 3.67 2.01 221. 67.88 0.76 101.
SW WA CASCADES/COWLITZ 3.06 1.63 215. 54.25 -0.65 99.
WILLAMETTE VALLEY 2.47 1.18 191. 47.96 1.40 103.
ROGUE/ UMPQUA 1.72 0.98 232. 33.56 5.00 118.
KLAMATH BASIN 0.63 0.30 190. 12.44 -1.54 89.
LAKE COUNTY-GOOSE LAKE 0.41 0.10 132. 7.35 -0.60 92.
HARNEY/ MALHEUR BASIN 0.32 0.03 112. 6.58 -0.38 95.
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.
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