Weyerhaeuser Report on Washington and Oregon December 2007 Storm Now Available

FEDERAL WAY, Wash.--(Business Wire)--
Weyerhaeuser Company today issued a summary and report on the
series of storms that hit southwest Washington and northwest Oregon on
Dec. 1-4, 2007. The extremely high winds and rainfall caused
significant tree blowdown, landslides, and flooding, resulting in
extensive property damage and displacing hundreds of people from their
homes, farms and businesses.

The report, prepared by Weyerhaeuser hydrologist Maryanne Reiter,
is based on data gathered by the National Weather Service, the U.S.
Army Corps of Engineers, the U.S. Geological Survey, the Oregon
Climate Service, the Office of the Washington State Climatologist,
NASA, Weyerhaeuser and other private weather data sources. Various
agency personnel reviewed the data underlying the report and the
conclusions of the report.

The report was prepared by Weyerhaeuser in order to understand and
characterize the magnitude of the storm event and inform its practices
going forward.

Some highlights of the report:

-- "The December 1-3 storm offered nearly every winter season
hazard...snow...strong winds...heavy rainfall...major
flooding...landslides...avalanches and high coastal surf
and coastal flooding," National Weather Service report,
issued Dec. 19, 2007

-- The National Weather Service issued the first-ever
hurricane warning in the Pacific Northwest.

-- Record rainfall amounts fell in many areas of southwest
Washington and northwest Oregon, in some areas the highest
levels recorded in more than a century of reporting.

-- In addition to record rainfall, the intensity of the
precipitation was extremely high in some localized areas.
In other words, a great deal of rain fell and it fell very
quickly.

-- Five new, all-time flood records were set on the Chehalis
River in southwest Washington.

The report summary concludes: "This storm produced concurrent
extreme magnitude events; hurricane-strength winds along the coast and
an estimated 500-year flood further inland in the upper Chehalis River
basin. High winds impacted the coasts of Oregon and Washington from
Newport to Hoquiam. This storm produced a maximum recorded wind gust
of 147 mph and was the first ever hurricane force wind warning issued
by NWS in the Pacific Northwest. While maximum speeds may have been
higher in the 1962 Columbus Day storm, this event was of longer
duration, which led to extensive damage. The rain portion of the storm
produced not only high storm totals, but also 24-hour rainfall
intensities that were up to 140% higher than the 100-year amounts for
areas in southwest Washington. Two weather stations with records back
to the late 1800s broke all-time records. This high rain led to
extensive flooding with ten rivers in Washington exceeding their flood
of record. In the Chehalis River basin 5 all-time high records were
broken. For the stations in the upper Chehalis River, flood peaks were
twice the previous flood of record and estimated to have a recurrence
interval of 500-years. Either one of the events -- the windstorm or
the flooding, would have been notable individually, but taken
together, they compounded the extreme nature of the storm."

Copies of the report are available here
December2007StormEventSummary.pdf. (Due to its length, this URL may
need to be copied/pasted into your Internet browser's address field.
Remove the extra space if one exists.)

Weyerhaeuser Company, one of the world's largest forest products
companies, was incorporated in 1900. In 2007, sales were $16.3
billion. It has offices or operations in 13 countries, with customers
worldwide. Weyerhaeuser is principally engaged in the growing and
harvesting of timber; the manufacture, distribution and sale of forest
products; and real estate construction, development and related
activities. Additional information about Weyerhaeuser's businesses,
products and practices is available at www.weyerhaeuser.com.

Weyerhaeuser Company
Media
Frank Mendizabal, 253-924-3357

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