Wed, 12 May 2010 08:34:45 -0500
SEATTLE, Wash. -- El Nino weather patterns and a relatively mild winter left Idaho, eastern Washington and south central Oregon drier than normal and vulnerable to wildfire. In addition to urging extreme caution with campfires, fireworks, trash fires, grills and other heat sources, FEMA Acting Regional Administrator Dennis Hunsinger encourages residents living on wooded lots and wildland/urban interface areas to stay informed on local conditions.
Showing posts with label El Nino. Show all posts
Showing posts with label El Nino. Show all posts
Wednesday, May 12, 2010
Thursday, February 11, 2010
Winter Returns...With a Twist
Over on Oregon Live there is an article about the return of winter storms to the North West.
The winter of our warm content will hit a small speed bump this week, as a series of storms sweep in off the Pacific, bringing rain to the valleys and much needed snow to the Cascades.
During this most typical of El Niño winters, every little bit helps when it comes to precipitation and especially building the snowpack before the gradual summer melt-off. Still, don't expect the kind of lashing rains and three foot snow dumps we should have been seeing in January and the first ten days of February.
El Niño -- the warming of the equatorial Pacific Ocean surface off the coast of South America that occurs about every two to six years -- tends to spell drier and warmer winters in the Pacific Northwest, wetter storms in the Southwest and colder winters in the South. "
As Februarys go, it's not going to be that bad," said forecaster Chris Collins of the National Weather Service in Portland. "We're going to see a system come through about every 24 hours for the next several days, but the jet stream is not aimed at us so the brunt of these storms will brush us and head to the north into Washington."
Check out the full explanation at http://www.oregonlive.com/news/index.ssf/2010/02/winter_returns_sort_of_with_a.html
The winter of our warm content will hit a small speed bump this week, as a series of storms sweep in off the Pacific, bringing rain to the valleys and much needed snow to the Cascades.
During this most typical of El Niño winters, every little bit helps when it comes to precipitation and especially building the snowpack before the gradual summer melt-off. Still, don't expect the kind of lashing rains and three foot snow dumps we should have been seeing in January and the first ten days of February.
El Niño -- the warming of the equatorial Pacific Ocean surface off the coast of South America that occurs about every two to six years -- tends to spell drier and warmer winters in the Pacific Northwest, wetter storms in the Southwest and colder winters in the South. "
As Februarys go, it's not going to be that bad," said forecaster Chris Collins of the National Weather Service in Portland. "We're going to see a system come through about every 24 hours for the next several days, but the jet stream is not aimed at us so the brunt of these storms will brush us and head to the north into Washington."
Check out the full explanation at http://www.oregonlive.com/news/index.ssf/2010/02/winter_returns_sort_of_with_a.html
Tuesday, January 26, 2010
El Nino helping Green River Valley
http://www.StatesmanJournal.com
El Nino helping Green River Valley
avoid floods
By GEORGE TIBBITS
Associated Press Writer
January 26, 2010
SEATTLE — With winter half gone, some weather experts say the Green River Valley south of
Seattle may have avoided catastrophic flooding, at least this season.
The El Nino weather pattern affecting the Pacific Coast has helped bring a warm January to
the Pacific Northwest, along with drenching rains and snow to California. Here, it’s a huge
contrast to a year ago when record rains fell in the Green River watershed in the Cascade
foothills southeast of Seattle. That weakened a reservoir wall at the Howard Hanson flood
control dam, imperiling the heavily developed valley downstream.
Cliff Mass, professor of atmospheric science at the University of Washington, said the current
mild weather could lead to Seattle’s warmest January on record. And in this region, he said,
“Once you get past the 20th of February, one month from now, I mean, winter’s over.”
For those living and working below the dam, “I think they’re home free at this point,” he said.
So has the worst passed?
“You can’t say that,” said J. Brent Bower, hydrologic program manager for the National
Weather Service in Seattle.
Bower points out that Washington suffered one of its most devastating floods in February
1996, which caused more than $300 million in damage throughout the state. The Green River
Valley escaped serious harm, but the 1996 combination of heavy rain and melting mountain
snow is precisely what worries emergency officials now.
El Nino is a periodic ocean warming along the equatorial Pacific that affects the climate.
Western Washington, meteorologists say, is having a typical El Nino season: normal winter
weather until around Jan. 1, then mostly milder, warmer and wetter conditions than usual.
Bower and Mass both say there’s no major storm in sight for the Seattle area for the next week
or so.
Meteorologist Larry Schick at the Army Corps of Engineers’ Seattle District says that while the
bulk of the flood season appears over, there’s no guarantee.
“We’re not quite there yet,” he said. “We’re close, though.”
Bower likewise says he’s getting more optimistic as the days go by, but that’s still tempered
with a large dose of caution.
“I think it would be a mistake to say the worst is over,” he said, “because this is the weather
business and that’s not a prudent tack to take.”
The series of rainstorms that have soaked Southern California resulted from a weather pattern
that pushed the storm track south, Bower said. Without that pattern, “instead of hitting down
there, it could have come up here.”
After the rains weakened the Hanson Dam’s right abutment a year ago, the Army corps, which
operates the dam, quickly drained the reservoir and drastically restricted the amount of water it
could hold. Over the summer, the corps hurriedly made temporary repairs, but by fall, corps
officials warned there was still a 1-in-25 chance that heavy rains might force them to release
enough water to cause flooding in the valley.
Downstream, millions of dollars have been spent to sandbag the meandering river’s channel
and to urge residents to protect their property and possibly evacuate. Besides the suburbs of
Auburn, Kent, Renton and Tukwila, the valley has one of the largest warehouse areas on the
West Coast and is home to a major Boeing factory and Starbucks’ regional coffee roasting
plant.
King County is still passing out free sand and sacks to valley residents and businesses, and
valley cities are patrolling levees and the sandbags atop them to make sure they remain
sound. Officials say they aren’t slacking off just because the weather’s been good.
“Oh my goodness, no,” said Christine Lange, spokeswoman for County Executive Dow
Constantine. “We’re in full force, just making sure people are aware of the risk.”
As it does every winter, the corps has kept the dam’s reservoir essentially empty so it can
absorb heavy flows from the watershed, Schick said.
While Seattle had a lot of rain earlier this month, Schick said precipitation at the dam has been
close to normal. Rainfall that’s spread over a week or more isn’t really a problem, he said: “It’s
the short, intense storms like last year that dump a lot of rain in just a few hours.”
Meteorologists said the downpour in early 2009 was exactly that: a powerful, moisture-laden
“Pineapple Express” storm track from the mid-Pacific that directly hit the Green’s watershed.
El Nino helping Green River Valley
avoid floods
By GEORGE TIBBITS
Associated Press Writer
January 26, 2010
SEATTLE — With winter half gone, some weather experts say the Green River Valley south of
Seattle may have avoided catastrophic flooding, at least this season.
The El Nino weather pattern affecting the Pacific Coast has helped bring a warm January to
the Pacific Northwest, along with drenching rains and snow to California. Here, it’s a huge
contrast to a year ago when record rains fell in the Green River watershed in the Cascade
foothills southeast of Seattle. That weakened a reservoir wall at the Howard Hanson flood
control dam, imperiling the heavily developed valley downstream.
Cliff Mass, professor of atmospheric science at the University of Washington, said the current
mild weather could lead to Seattle’s warmest January on record. And in this region, he said,
“Once you get past the 20th of February, one month from now, I mean, winter’s over.”
For those living and working below the dam, “I think they’re home free at this point,” he said.
So has the worst passed?
“You can’t say that,” said J. Brent Bower, hydrologic program manager for the National
Weather Service in Seattle.
Bower points out that Washington suffered one of its most devastating floods in February
1996, which caused more than $300 million in damage throughout the state. The Green River
Valley escaped serious harm, but the 1996 combination of heavy rain and melting mountain
snow is precisely what worries emergency officials now.
El Nino is a periodic ocean warming along the equatorial Pacific that affects the climate.
Western Washington, meteorologists say, is having a typical El Nino season: normal winter
weather until around Jan. 1, then mostly milder, warmer and wetter conditions than usual.
Bower and Mass both say there’s no major storm in sight for the Seattle area for the next week
or so.
Meteorologist Larry Schick at the Army Corps of Engineers’ Seattle District says that while the
bulk of the flood season appears over, there’s no guarantee.
“We’re not quite there yet,” he said. “We’re close, though.”
Bower likewise says he’s getting more optimistic as the days go by, but that’s still tempered
with a large dose of caution.
“I think it would be a mistake to say the worst is over,” he said, “because this is the weather
business and that’s not a prudent tack to take.”
The series of rainstorms that have soaked Southern California resulted from a weather pattern
that pushed the storm track south, Bower said. Without that pattern, “instead of hitting down
there, it could have come up here.”
After the rains weakened the Hanson Dam’s right abutment a year ago, the Army corps, which
operates the dam, quickly drained the reservoir and drastically restricted the amount of water it
could hold. Over the summer, the corps hurriedly made temporary repairs, but by fall, corps
officials warned there was still a 1-in-25 chance that heavy rains might force them to release
enough water to cause flooding in the valley.
Downstream, millions of dollars have been spent to sandbag the meandering river’s channel
and to urge residents to protect their property and possibly evacuate. Besides the suburbs of
Auburn, Kent, Renton and Tukwila, the valley has one of the largest warehouse areas on the
West Coast and is home to a major Boeing factory and Starbucks’ regional coffee roasting
plant.
King County is still passing out free sand and sacks to valley residents and businesses, and
valley cities are patrolling levees and the sandbags atop them to make sure they remain
sound. Officials say they aren’t slacking off just because the weather’s been good.
“Oh my goodness, no,” said Christine Lange, spokeswoman for County Executive Dow
Constantine. “We’re in full force, just making sure people are aware of the risk.”
As it does every winter, the corps has kept the dam’s reservoir essentially empty so it can
absorb heavy flows from the watershed, Schick said.
While Seattle had a lot of rain earlier this month, Schick said precipitation at the dam has been
close to normal. Rainfall that’s spread over a week or more isn’t really a problem, he said: “It’s
the short, intense storms like last year that dump a lot of rain in just a few hours.”
Meteorologists said the downpour in early 2009 was exactly that: a powerful, moisture-laden
“Pineapple Express” storm track from the mid-Pacific that directly hit the Green’s watershed.
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