HYDROLOGIC OUTLOOK

 
 FGUS76 KSEW 250023 CCA
 ESFSEW
 WAC009-027-031-033-041-045-053-057-061-067-073-251500-
 
 HYDROLOGIC OUTLOOK...CORRECTED
 NATIONAL WEATHER SERVICE SEATTLE WA
 422 PM PST TUE NOV 24 2009
 
 ...POSSIBILITY FOR FLOODING ON SOME WESTERN WASHINGTON RIVERS THURSDAY
 NIGHT INTO FRIDAY...
 
 A COLD FRONT WILL STALL OVER WESTERN WASHINGTON WEDNESDAY NIGHT
 AND REMAIN IN PLACE INTO THURSDAY NIGHT GENERATING PERIODS OF RAIN
 ACROSS THE REGION. A SURFACE LOW PRESSURE CENTER IS EXPECTED TO
 DEVELOP ALONG THE FRONT WELL WEST OF OREGON THEN MOVE UP THE FRONT
 AND ACROSS THE NORTHWEST EARLY FRIDAY. THIS LOW WILL GENERATE
 ANOTHER PERIOD OF HEAVIER RAIN ACROSS PARTS OF WESTERN WASHINGTON.
 THROUGH THIS PERIOD...FREEZING LEVELS WILL REMAIN HIGH ENOUGH FOR
 MOSTLY RAIN ACROSS THE MOUNTAINS.
 
 WHERE THE AREAS OF HEAVIER RAIN OCCUR WILL DEPEND UPON ON WHERE
 THE FRONT STALLS AND THE EXACT PATH OF THE LOW THAT IS EXPECTED TO
 MOVE UP THE FRONT. A NORTH OR SOUTH SHIFT OF EITHER WILL MAKE A
 SIGNIFICANT DIFFERENCE ON WHICH AREA RECEIVES THE HEAVIER RAINS.
 
 UNDER MORE NORMAL CIRCUMSTANCES...THE AMOUNT OF RAIN FORECAST
 WOULD GENERALLY NOT POSE THIS MUCH OF A PROBLEM...BUT RIVERS ARE
 STILL DRAINING WATER FROM THE RECENT RAINS AND COULD RESPOND MORE
 READILY TO ADDITIONAL RAINFALL.
 
 AT THIS TIME...RIVERS OF CONCERN INCLUDE THE SKOKOMISH ON THE
 OLYMPIC PENINSULA...AND THE FOLLOWING RIVERS FLOWING OFF THE
 CASCADES...THE SNOQUALMIE AT CARNATION...THE PUYALLUP RIVER NEAR
 ORTING AND THE LOWER REACHES OF THE CHEHALIS RIVER. IF MORE RAIN
 FALLS THAN IS CURRENTLY ANTICIPATED THEN A FEW ADDITIONAL RIVERS
 WOULD BE ADDED TO THIS LIST.
 
 THIS PRECIPITATION PATTERN IS NOT GOOD FOR GENERATING SIGNIFICANT
 RAINS IN THE GREEN RIVER BASIN...SO NO FLOODING IS EXPECTED ON
 THE GREEN RIVER DURING THE PERIOD.
 
 

 
 CERNIGLIA