FLASH FLOOD WATCH NOW IN EFFECT THROUGH TUESDAY AFTERNOON... THE FLASH FLOOD WATCH IS NOW IN EFFECT FOR * A PORTION OF WESTERN WASHINGTON...INCLUDING THE FOLLOWING COUNTY... SNOHOMISH. * THROUGH TUESDAY AFTERNOON * THE NORTH FORK STILLAGUAMISH RIVER IS MAKING A NEW RIVER CHANNEL ON THE NORTH END OF THE OSO LANDSLIDE BLOCKAGE. AT THIS TIME IT IS FLOWING IN AN ORDERLY FASHION. * THE INSTABILITY OF THE DEBRIS DAM AND THE MATERIAL IN IT...AND THE UNKNOWN NATURE OF HOW AND HOW FAST THE NEW RIVER CHANNEL WILL CUT DOWN THROUGH IT AND DRAIN THE LAKE...MEANS THERE REMAINS A FLASH FLOOD THREAT BELOW THE BLOCKAGE UNTIL THE IMPOUNDED LAKE DRAINS DOWN AT LEAST TO SOME DEGREE. THIS COULD STILL RESULT IN A RAPID RISE OF WATER AND IS A POTENTIALLY DANGEROUS SITUATION. * THE GREATEST THREAT OF FLOODING FROM A RELEASE OF THE IMPOUNDED WATER IS IN THE VICINITY OF THE SLIDE DEBRIS BLOCKAGE... IMMEDIATELY DOWNSTREAM OF IT...AND IN THE STREAM CHANNEL DOWN TO THE CONFLUENCE WITH THE SOUTH FORK.
Posted on: Tue, 25 Mar 2014 01:13:08 +0000
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