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Flood Warning

FLOOD WARNING
NATIONAL WEATHER SERVICE SEATTLE WA
422 PM PDT THU APR 24 2014

FLOOD BULLETIN NO. 38

WAC061-252345-
/O.EXT.KSEW.FA.W.0003.000000T0000Z-140425T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SNOHOMISH-
422 PM PDT THU APR 24 2014

THE NATIONAL WEATHER SERVICE IN SEATTLE HAS EXTENDED THE

* FLOOD WARNING THE FOLLOWING WESTERN WASHINGTON COUNTIES...
  NORTH CENTRAL SNOHOMISH COUNTY...

* UNTIL 445 PM PDT FRIDAY.

* 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.

* HEAVY RAIN WEDNESDAY NIGHT THROUGH THIS MORNING BROUGHT 0.85 TO
  1.00 INCH OF RAIN THE AREA WITH A 1 TO 1.5 FOOT RISE ON THE
  NORTH FORK OF THE STILLAGUAMISH RIVER. THE RIVER CRESTED THIS
  AFTERNOON AND IS NOW RECEDING. SCATTERED SHOWERS TONIGHT AND
  FRIDAY MAY BRING ANOTHER 0.25 INCHES OF RAIN...THEN ANOTHER 0.60
  INCHES OR SO WITH A COLD FRONT AND SHOWERS SATURDAY NIGHT THROUGH
  SUNDAY. THIS SYSTEM MAY PRODUCE SHARPER RISES ON THE RIVER AGAIN.

* AT 400 PM PDT THURSDAY...THE NORTH FORK OF THE STILLAGUAMISH
  RIVER NEAR ARLINGTON WAS AT 6.03 FEET OR 5124 CFS. THE NORTH FORK
  OF THE STILLAGUAMISH NEAR OSO WAS AT 218.01 FEET...OR 3322 CFS.

* AT 945 AM PDT THURSDAY...THE ELEVATION OF THE SLIDE POOL TO THE
  EAST OF THE SR 530 LANDSLIDE WAS 283.36 FEET. THERE CONTINUES TO
  BE A GREAT AMOUNT OF UNCERTAINTY IN THE FORECAST POOL ELEVATION
  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

$$


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