Water Supply Summary

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 6, 2008

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