Snohomish County, Washington
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The National Weather Service's Watches, Warnings and Advisories by state counties include: Thunderstorm, Tornado, Flood, Flash Flood, Winter Storm, High Wind, Gale, Small Aircraft, High Surf, Marine, Heat, Air Quality, Ashfall, Hazardous, and Special Statements.
Weather Alerts: Snohomish County, Washington
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Flood Warning
WAC061-242345-
/O.EXT.KSEW.FA.W.0003.000000T0000Z-140424T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SNOHOMISH-
1245 PM PDT THU APR 17 2014

THE NATIONAL WEATHER SERVICE IN SEATTLE HAS EXTENDED THE

* FLOOD WARNING FOR THE NORTH FORK STILLAGUAMISH RIVER EAST OF THE
STATE ROUTE 530 SLIDE IN NORTH CENTRAL SNOHOMISH COUNTY...

* UNTIL 445 PM PDT APRIL 24.

* FLOODING CONTINUES ON THE NORTH FORK OF THE STILLAGUAMISH RIVER
UPSTREAM OF THE SR 530 SLIDE DUE TO DEBRIS FROM THE STATE ROUTE
530 SLIDE PARTIALLY BLOCKING THE RIVER AND THE RESULTING POOLING
OF WATER BEHIND THE DEBRIS DAM. WE WILL BE UPDATING THE FLOOD
WARNING ON A DAY TO DAY BASIS.

* THE OSO AREA HAS RECEIVED 1.84 INCHES OF RAIN IN THE LAST 24
HOURS. THE RAINFALL FORECAST IS FOR ANOTHER 1.0 INCHES OF RAIN IN
THE OSO AREA AND UP TO 1.5 INCHES IN THE MOUNTAINS THROUGH FRIDAY
MORNING. THE RIVER WILL CONTINUE RISING TODAY...CRESTING TONIGHT
BEFORE MIDNIGHT WITH THE LARGEST FLOWS SINCE THE SLIDE OCCURRED.
THE PEAK FLOW FORECAST FOR THE NORTH FORK RIVER NEAR ARLINGTON
GAGE IS NEAR 9.3 FT. OR 13000 CFS AND NEAR 7900 CFS FOR THE
NORTH FORK STILLAGUAMISH RIVER AT OSO.

* AT 1200 PM PDT...THE POOL ELEVATION WAS 285.8 FT.

* THE POOL ELEVATION IS FORECAST TO RISE TO 287.7 FT. BY THURSDAY
NIGHT BEFORE MIDNIGHT. THE POOL ELEVATION WILL START DROPPING
SIGNIFICANTLY FRIDAY. THERE IS A GREAT AMOUNT OF UNCERTAINTY IN
THE FORECAST POOL ELEVATION CREST DUE IN PART TO LIMITED KNOWLEDGE
OF HOW MUCH WATER THE NEW STREAM CHANNEL THROUGH THE SLIDE DEBRIS
WILL BE ABLE TO CONVEY.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLOOD WARNING MEANS FLOODING IS OCCURRING OR IMMINENT. MOST FLOOD
RELATED DEATHS OCCUR IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS WATER
COVERED BRIDGES...DIPS...OR LOW WATER CROSSINGS. NEVER TRY TO CROSS A
FLOWING STREAM...EVEN A SMALL ONE...ON FOOT. TO ESCAPE RISING WATER
MOVE UP TO HIGHER GROUND.

&&

LAT...LON 4825 12181 4829 12185 4829 12177 4829 12166
4824 12165 4826 12174

$$

National Weather Service

Providing "weather, water cycle, and climate forecasts and warnings for the United States, its territories, adjacent waters and ocean areas, for the protection of life and property and the enhancement of the national economy."
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