Alert archive / California / Flash Flood Warnings in 2008

Flash Flood Warning 49, NWS San Diego, CA

August 30, 2008San Bernardino County, California

NWS San Diego, CA issued this flash flood warning at Aug 30, 2008, 2:53 PM PDT for San Bernardino County, California. It was in force for 86 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 30, 2008, 2:53 PM PDT (21:53 UTC)
Expired
Aug 30, 2008, 4:19 PM PDT
In force
86 min
Issued by
NWS San Diego, CA
Area
Storm-based polygon
Flood severity
None

County San Bernardino County, CA

The radar

The Santa Ana Mts radar (KSOX), 86 km from the middle of the area, began a volume at 22:04 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.

The nearest sounding before it

San Diego, CA (KNKX), launched 12:00Z, 9.9 hours before the alert went out and 168 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 2008-08-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, San Diego, CA at 12:00Z on 2008-08-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 17 square meters per square second.1939Sfc1 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
1 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1329 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
17 m²/s²
0-3 km storm-relative helicity
57 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
WGUS56 KSGX 302153
FFWSGX
CAC071-310045-
/O.NEW.KSGX.FF.W.0049.080830T2153Z-080831T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN DIEGO CA
253 PM PDT SAT AUG 30 2008

THE NATIONAL WEATHER SERVICE IN SAN DIEGO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTH CENTRAL SAN BERNARDINO COUNTY IN SOUTHEAST CALIFORNIA...

* UNTIL 545 PM PDT

* AT 245 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
FLASH FLOODING FROM THUNDERSTORMS OVER THE WARNED AREA. RADAR 
INDICATES RAINFALL RATES OF ONE TO TWO INCHES PER HOUR MAY BE 
EXPECTED WITH THE HEAVIER STORMS...ALONG WITH SMALL HAIL. 

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO BIG BEAR   
LAKE...BIG BEAR CITY...ONYX PEAK


DEBRIS FLOWS ISSUING FROM BASINS BURNED BY THE SLIDE FIRE CAN IMPACT
HIGHWAYS 330 AND 18...AND ANY OTHER ROADS WITHIN THE BURNED AREA...
PARTICULARLY WHERE THEY CROSS BURNED DRAINAGES.

LAT...LON 3439 11702 3438 11677 3415 11668 3413 11699

$$

PURPURA
1 follow-up statement
000 
WGUS76 KSGX 302319
FFSSGX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
419 PM PDT SAT AUG 30 2008

CAC071-302328-
/O.CAN.KSGX.FF.W.0049.000000T0000Z-080831T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
419 PM PDT SAT AUG 30 2008

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR SOUTH CENTRAL SAN
BERNARDINO COUNTY...

THE FLASH FLOOD WARNING THAT INCLUDED THE HIGH DESERT AREAS OF APPLE 
AND LUCERNE VALLEYS IN SAN BERNARDINO COUNTY HAS BENN CALCELLED. THE 
STORMS HAVE ENDED AND FLASH FLOODING IS NO LONGER A THREAT. 

LAT...LON 3439 11702 3438 11677 3415 11668 3413 11699

$$
PURPURA

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 29, 8:50 PM PDTFlash Flood WatchSGXRiverside, San Bernardino, San Diego21 hr
Aug 30, 7:49 AM PDTFlash Flood WarningSGXSan Diego3 hr
Aug 30, 1:33 PM PDTFlash Flood WarningSGXRiverside, San Bernardino3 hr
Aug 30, 2:09 PM PDTFlash Flood WarningSGXSan Bernardino2 hr
Aug 30, 2:38 PM PDTFlash Flood WarningSGXRiverside96 min

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.