Water Supply Summary

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: June 6, 2008

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