CA: California Watches and Warnings - Socal flash flood warnings

FLOOD WATCH
NATIONAL WEATHER SERVICE SAN DIEGO CA
1033 AM PST TUE DEC 18 2007

...FLASH FLOOD WATCH FOR ORANGE COUNTY AND THE MOUNTAINS OF
SOUTHWEST SAN BERNARDINO COUNTY FOR THIS AFTERNOON THROUGH
WEDNESDAY MORNING...MAINLY IN AND BELOW RECENTLY BURNED AREAS AND
ON STEEP TERRAIN...

.A COLD FRONT WILL MOVE ACROSS SOUTHWEST CALIFORNIA TONIGHT.
BETWEEN ONE AND TWO INCHES OF RAIN IS FORECAST TO FALL DURING THIS
TIME PERIOD. LIGHT TO MODERATE RAIN IS FORECAST FOR THE AFTERNOON...WITH
MODERATE TO HEAVY RAIN OCCURRING DURING THE EVENING THROUGH EARLY
WEDNESDAY MORNING. THE GROUND IS EXPECTED TO BECOME SATURATED BY
THIS EVENING...AND EXCESSIVE RAINFALL OCCURRING LATER MAY PRODUCE
FLASH FLOODING. MUD AND DEBRIS FLOWS ARE POSSIBLE IN AND BELOW THE
AREAS BURNED IN THE SANTIAGO...GRASS VALLEY...AND SLIDE WILDFIRES
IN OCTOBER.

A FLASH FLOOD WATCH FOR THE BURN AREAS IS ISSUED WHEN THERE IS
THE POTENTIAL THAT RAINFALL INTENSITIES COULD REACH OR EXCEED
THRESHOLDS...AS DETERMINED BY THE UNITED STATES GEOLOGICAL
SURVEY...DEEMED TO BE CAPABLE OF PRODUCING FLASH FLOODING WITH MUD
AND DEBRIS FLOWS IN AND AROUND THE BURN AREAS.

...FLASH FLOOD WATCH REMAINS IN EFFECT FROM 2 PM PST THIS
AFTERNOON THROUGH WEDNESDAY MORNING...

THE FLASH FLOOD WATCH CONTINUES FOR

* A PORTION OF SOUTHWEST CALIFORNIA...INCLUDING THE FOLLOWING
AREAS...ORANGE COUNTY COASTAL AREAS...SAN BERNARDINO COUNTY
MOUNTAINS AND SANTA ANA MOUNTAINS AND FOOTHILLS.

* FROM 2 PM PST THIS AFTERNOON THROUGH WEDNESDAY MORNING

* EXCESSIVE RAINFALL WITH RAINFALL RATES OF A HALF INCH OR MORE
PER HOUR DURING THE PEAK OF THE EVENT.

* FLASH FLOODING OF CREEKS...LOW LYING AREAS OF THE COASTAL
PLAIN...MUD AND DEBRIS FLOWS IN AND BELOW THE AREAS BURNED
DURING THE SANTIAGO...GRASS VALLEY...AND SLIDE WILDFIRES AND IN
STEEP TERRAIN.

A FLASH FLOOD WATCH FOR THE BURN AREAS IS ISSUED WHEN THERE IS
THE POTENTIAL THAT RAINFALL INTENSITIES COULD REACH OR EXCEED
THRESHOLDS...AS DETERMINED BY THE UNITED STATES GEOLOGICAL
SURVEY...DEEMED TO BE CAPABLE OF PRODUCING FLASH FLOODING WITH MUD
AND DEBRIS FLOWS IN AND AROUND THE BURN AREAS.

A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD
TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION.

YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION
SHOULD FLASH FLOOD WARNINGS BE ISSUED.

CAZ042-043-048-050-055>058-060>062-182200-
ORANGE COUNTY COASTAL AREAS-SAN DIEGO COUNTY COASTAL AREAS-
SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS-THE INLAND EMPIRE-
SAN DIEGO COUNTY VALLEYS-SAN BERNARDINO COUNTY MOUNTAINS-
RIVERSIDE COUNTY MOUNTAINS-SANTA ANA MOUNTAINS AND FOOTHILLS-
SAN DIEGO COUNTY MOUNTAINS-APPLE AND LUCERNE VALLEYS-
COACHELLA VALLEY-SAN DIEGO COUNTY DESERTS-
445 AM PST TUE DEC 18 2007

...A PACIFIC SYSTEM WILL MOVE THROUGH SOUTHWEST CALIFORNIA TONIGHT
AND WEDNESDAY...

A FAST MOVING PACIFIC STORM WILL BRING INCREASING CLOUDINESS WITH A
CHANCE OF RAIN TODAY MAINLY IN ORANGE AND SAN BERNARDINO COUNTIES.
RAIN WILL BE MORE LIKELY OVER AND WEST OF THE MOUNTAINS TONIGHT AS
THE SYSTEM MOVES THROUGH...LINGERING WEDNESDAY.

PRELIMINARY RAINFALL ESTIMATES RANGE FROM ABOUT AN INCH NEAR THE
ORANGE COUNTY COAST TO TWO AND A HALF INCHES ON THE COASTAL MOUNTAIN
SLOPES OF SAN BERNARDINO COUNTY. RAINFALL TOTALS WILL GENERALLY BE
LESS OVER WESTERN RIVERSIDE AND SAN DIEGO COUNTIES...RANGING FROM A
HALF INCH AT THE COAST TO AN INCH OVER THE MOUNTAINS. THE HIGH
DESERTS COULD GET AROUND A HALF INCH OF RAIN WHILE THE LOWER DESERTS
SHOULD WILL RECEIVE LESS THAN A QUARTER INCH OF RAIN. THE SNOW LEVEL
WILL BE RATHER HIGH...ABOVE 7000 FEET. NEW SNOWFALL AT ELEVATIONS
ABOVE 7500 FEET COULD EXCEED A FOOT. MODERATELY STRONG GUSTY WINDS
WILL ACCOMPANY THIS STORM...MAINLY IN THE MOUNTAINS AND HIGH
DESERTS.

IN ORANGE COUNTY AND THE SAN BERNARDINO MOUNTAINS THESE RAINFALL
AMOUNTS AND RATES COULD LEAD TO FLASH FLOODING...AS WELL AS MUD
SLIDES AND DEBRIS FLOWS IN AND BELOW RECENTLY BURNED AREAS. A FLASH
FLOOD WATCH IS IN EFFECT FOR THESE AREAS FOR THIS AFTERNOON THROUGH
WEDNESDAY MORNING.

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