

000 

WGUS56 KSGX 190757

FFWSGX

CAC059-191200-



BULLETIN - EAS ACTIVATION REQUESTED

FLASH FLOOD WARNING

NATIONAL WEATHER SERVICE SAN DIEGO CA

1158 PM PST SAT FEB 18 2006



THE NATIONAL WEATHER SERVICE IN SAN DIEGO HAS ISSUED A



* FLASH FLOOD WARNING FOR...

  NORTH CENTRAL ORANGE COUNTY IN SOUTHWEST CALIFORNIA

  THIS INCLUDES THE CITY OF YORBA LINDA



* UNTIL 400 AM PST



* AT 1150 PM PST...A LINE OF SHOWERS AND THUNDERSTORMS WAS MOVING 

  ACROSS NORTHERN ORANGE COUNTY FROM HUNTINGTON BEACH TO YORBA 

  LINDA. THE RAIN EXTENDED WEST OVER THE PACIFIC OCEAN...AND WAS

  MOVING NORTHEAST AT 25 MPH...RESULTING IN A 2 TO 3 HOUR PERIOD OF 

  MODERATE TO HEAVY RAIN ACROSS ORANGE COUNTY.



IN ADDITION TO FLASH FLOODING...RAINFALL IS EXPECTED TO CAUSE DEBRIS 

FLOWS IN THE WATERSHEDS BURNED BY THE SIERRA AND YORBA LINDA FIRES. 

THE SOILS IN A BURN SCAR ARE HIGHLY ERODIBLE SO FLOOD WATERS CAN 

CONTAIN SIGNIFICANT AMOUNTS OF ASH...MUD... BOULDERS...AND 

VEGETATION.



A SHORT PERIOD OF MODERATE RAINFALL ON THE BURNED WATERSHEDS CAN 

LEAD TO FLASH FLOODS AND DEBRIS FLOWS. DRAINAGES IN FEATHERLY 

REGIONAL PARK...THE STREAM CROSSINGS ON STATE HIGHWAYS 91 AND 241 

AND GYPSUM CANYON ROAD...AND SANTIAGO RESERVOIR COULD BE IMPACTED BY 

THESE EVENTS. 



IN ADDITION TO FLASH FLOODING...RAINFALL IS EXPECTED TO CAUSE DEBRIS 

FLOWS IN THE YORBA LINDA BURN AREA ACCORDING TO THRESHOLDS PROVIDED 

BY THE USGS. AREAS AFFECTED INCLUDE PARTS OF TELEGRAPH CANYON ROAD 

AND CARBON CANYON ROAD.



LAT...LON 3384 11779 3378 11774 3374 11772 3381 11762

      3388 11768 3394 11777 3391 11779



$$



MGM/RB

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