

000 

WGUS76 KSGX 042117

FFSSGX



FLASH FLOOD STATEMENT

NATIONAL WEATHER SERVICE SAN DIEGO CA

217 PM PDT MON AUG 4 2008



CAC065-042230-

/O.CON.KSGX.FF.W.0040.000000T0000Z-080804T2230Z/

/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

RIVERSIDE CA-

217 PM PDT MON AUG 4 2008



...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 330 PM PDT FOR

CENTRAL RIVERSIDE COUNTY...



AT 207 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO

INDICATE A THUNDERSTORM PRODUCING FLASH FLOODING OVER THE WARNED

AREA.



LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO RANCHO 

MIRAGE...PALM SPRINGS...PALM DESERT COUNTRY...PALM 

DESERT...CATHEDRAL CITY AND HIGHWAY 74 BETWEEN MOUNTAIN CENTER AND 

PALM DESERT. 



STEEP TERRAIN AND THE WATERSHEDS BURNED THIS FALL ARE PARTICULARLY 

SUSCEPTIBLE TO FLASH FLOODS AND DEBRIS FLOWS DURING RAINSTORMS. A 

SHORT PERIOD OF EVEN MODERATE RAINFALL ON STEEP TERRAIN OR A BURNED 

WATERSHED CAN LEAD TO DEBRIS FLOWS. RAINFALL THAT IS NORMALLY 

ABSORBED INTO HILLSLOPE SOILS CAN RUN OFF ALMOST INSTANTLY AFTER 

VEGETATION HAS BEEN REMOVED BY WILDFIRE. THIS CAUSES MUCH GREATER 

AND MORE RAPID RUNOFF THAN IS NORMAL FROM CREEKS AND DRAINAGE AREAS. 

THE HIGHLY ERODIBLE SOILS IN A BURN SCAR ALLOW FLOOD WATERS TO 

ENTRAIN LARGE AMOUNTS OF ASH, MUD...BOULDERS...AND UNBURNED 

VEGETATION. WITHIN THE BURNED AREA AND DOWNSTREAM...THE FORCE OF 

RUSHING WATER...SOIL AND ROCK CAN DESTROY 

CULVERTS...BRIDGES...ROADWAYS AND BUILDINGS...POTENTIALLY CAUSING 

INJURY OR DEATH.



MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO

AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY

DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL

ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED

ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.



LAT...LON 3380 11666 3385 11650 3384 11630 3353 11628

      3351 11654



$$



ATKIN

