Alert archive / California / Flash Flood Warnings in 2008

Flash Flood Warning 13, NWS San Diego, CA

January 27, 2008Riverside County, California

NWS San Diego, CA issued this flash flood warning at Jan 27, 2008, 7:00 AM PST for Riverside County, California. It was in force for 4 hr. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Jan 27, 2008, 7:00 AM PST (15:00 UTC)
Expired
Jan 27, 2008, 11:00 AM PST
In force
4 hr
Issued by
NWS San Diego, CA
Area
Storm-based polygon
Flood severity
None

County Riverside County, CA

The radar

The Santa Ana Mts radar (KSOX), 61 km from the middle of the area, began a volume at 15:02 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

TimeReportWhereRemark
Jan 27, 8:14 AM PSTFLOOD4 E Cabazon, CAAT RUSHMORE AV JSO TAMARACK RD-2 VEHS STUCK AND SUBMERGED IN FLOOD.
Jan 27, 8:23 AM PSTFLASH FLOODTemecula, CAMUDSLIDE BLOCKING NB RT LANES NR BUTTERFIELD STAGE RD JNO RANCHO CALIFORNIA.
Jan 27, 10:39 AM PSTFLOOD6 Wnw San Jacinto, CABRIDGE ST CLOSURE DUE TO FLOODED ROADWAY JNO RAMONA EXPWY.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

San Diego, CA (KNKX), launched 12:00Z, 3.0 hours before the alert went out and 100 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, San Diego, CA at 12:00Z on 2008-01-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 58 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, San Diego, CA at 12:00Z on 2008-01-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 171 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
58 J/kg
Mixed-layer CIN
-221 J/kg
Mixed-layer LCL
594 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
171 m²/s²
0-3 km storm-relative helicity
182 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS56 KSGX 271500
FFWSGX
CAC065-271900-
/O.NEW.KSGX.FF.W.0013.080127T1500Z-080127T1900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN DIEGO CA
700 AM PST SUN JAN 27 2008

THE NATIONAL WEATHER SERVICE IN SAN DIEGO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WESTERN RIVERSIDE COUNTY IN SOUTHWEST CALIFORNIA... 
  THIS INCLUDES THE CITIES OF...TEMECULA...HEMET...SAN JACINTO...

* UNTIL 1100 AM PST

* AT 650 AM PST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
  AREAS OF HEAVY RAIN CONTINUING OVER THE WARNED AREA. LOCAL LAW 
  ENFORCEMENT OFFICIALS REPORTED MUD FLOWS ALONG DE LUZ ROAD NEAR
  THE RICE BURN AREA...SOUTHWEST OF TEMECULA. A MUD SLIDE FROM THE 
  ESPERANZA BURN AREA WAS ALSO REPORTED ALONG SOBOBA ROAD NEAR 
  GILMAN SPRINGS ROAD...NEAR SAN JACINTO. 

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO VALLE
  VISTA...SUN CITY...SAN JACINTO...RANCHO MIRAGE...PALM DESERT...EAST
  HEMET...CATHEDRAL CITY...BEAUMONT AND BANNING

DEBRIS FLOWS ISSUING FROM BURNED BASINS CAN IMPACT INTERSTATE 15 AND
COUNTY ROAD S-13, ROADS UP STEWART CANYON AND RAINBOW CREEK, AS WELL
AS ANY OTHER ROADS WITHIN THE BURNED AREA, PARTICULARLY WHERE THEY
CROSS BURNED DRAINAGES. NEIGHBORHOODS AND BUILDINGS LOCATED ALONG
DRAINAGES WITHIN OR BELOW ANY OF THE BURNED BASINS CAN ALSO BE
IMPACTED BY FLOODS AND DEBRIS FLOWS.

THE WATERSHEDS BURNED BY THE ESPERANZA FIRE WILL BE PARTICULARLY 
SUSCEPTIBLE TO FLASH FLOODS AND DEBRIS FLOWS DURING RAINSTORMS. THE 
PARTS OF THE COMMUNITIES OF BEAUMONT AND BANNING THAT ARE LOCATED 
ADJACENT TO THE BURNED AREA... INCLUDING SMITH CANYON AND POTRERO 
CREEK... MAY BE AFFECTED BY THESE EVENTS. IN ADDITION...ROADS MAY BE 
IMPACTED BY THESE EVENTS WHERE THEY CROSS BURNED DRAINAGES. THESE 
ROADS INCLUDE... BUT ARE NOT LIMITED TO BEAUMONT AVENUE... CIRCLE C 
ROAD... CASTILLE CANYON ROAD... HIGHLAND SPRINGS AVENUE... OLD 
BANNING IDYLLWILD ROAD... SHIRLEON DRIVE...POPPET FLATS ROAD... 
STATE HIGHWAY 243... CRYER DRIVE AND MOUNT EDNA ROAD.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.

LAT...LON 3343 11723 3345 11725 3346 11729 3351 11738
      3401 11700 3400 11693 3404 11693 3403 11651
      3343 11620
TIME...MOT...LOC 1449Z 180DEG 0KT 3366 11672

$$

LAVIS

The office that day

Everything else NWS San Diego, CA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jan 27, 3:55 AM PSTFlash Flood WarningSGXSan Bernardino4 hr
Jan 27, 4:35 AM PSTFlash Flood WarningSGXSan Diego6 hr
Jan 27, 9:50 AM PSTRiver Flood WarningSGXSan Bernardino13 hr

Nearby

Flash Flood Warnings in California, 2008Every flash flood warning in 2008

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.