Alert archive / California / Flash Flood Warnings in 2004

Flash Flood Warning 5, NWS Las Vegas, NV

August 13, 2004San Bernardino County, California

NWS Las Vegas, NV issued this flash flood warning at Aug 13, 2004, 11:32 AM PDT for San Bernardino County, California. It was in force for 28 days. 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 13, 2004, 11:32 AM PDT (18:32 UTC)
Expired: Sep 10, 2004, 5:15 PM PDT
In force: 28 days
Issued by: NWS Las Vegas, NV
Area: Counties, with a storm outline in the text

County San Bernardino County, CA

The nearest sounding before it

Mercury/Desert R, NV (KDRA), launched 12:00Z, 6.5 hours before the alert went out and 192 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 9 J/kg
Mixed-layer CIN: -256 J/kg
Mixed-layer LCL: 2316 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: -68 m²/s²
0-3 km storm-relative helicity: 151 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 
WGUS55 KVEF 131834
FFWVEF
CAC071-132030-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
1132 AM PDT FRI AUG 13 2004

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 130 PM PDT

* AT 1129 AM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM A THUNDERSTORM OVER CENTRAL SAN BERNARDINO     
  COUNTY WITH VERY LITTLE MOVEMENT. RADAR HAS ESTIMATED BETWEEN 2    
  AND 2 AND HALF INCHES OF RAIN JUST NORTH OF I-40 ALONG KELBAKER RD.

* THE STORM PRODUCING FLASH FLOODING WILL OTHERWISE REMAIN OVER      
  MAINLY RURAL AREAS OF SAN BERNARDINO COUNTY...HOWEVER RUNOFF CAN 
  POTENTIALLY IMPACT I-40 NEAR KELBAKER RD.

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. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY.
MOVE TO HIGHER GROUND.

LAT...LON 3505 11568 3492 11593 3458 11578 3499 11516

$$
CZYZYK

1 follow-up statement

000 
WGUS55 KVEF 102213
FFWVEF
CAC071-110015-
/X.NEW.KVEF.FF.W.0005.040910T2212Z-040911T0015Z/
/0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
312 PM PDT FRI SEP 10 2004

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 515 PM PDT

* AT 308 PM PDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED FLASH     
  FLOODING FROM A THUNDERSTORM IN WONDER VALLEY NORTHEAST OF         
  TWENTYNINE PALMS. FLOODING IS LIKELY ALONG AMBOY ROAD AND TWENTY   
  NINE PALMS HIGHWAY.

* THE STORM PRODUCING FLASH FLOODING WILL OTHERWISE REMAIN OVER
  MAINLY RURAL AREAS OF THE INDICATED COUNTY.

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. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY.
MOVE TO HIGHER GROUND.

FLOODING IS OCCURRING OR IS IMMINENT. MOST FLOOD RELATED DEATHS OCCUR
IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS WATER COVERED BRIDGES...
DIPS...OR LOW WATER CROSSINGS. NEVER TRY TO CROSS A FLOWING STREAM...
EVEN A SMALL ONE...ON FOOT. TO ESCAPE RISING WATER MOVE UP TO HIGHER
GROUND.

LAT...LON 3410 11598 3408 11566 3427 11567 3427 11597

$$
CZYZYK

The office that day

Everything else NWS Las Vegas, NV issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 12, 9:53 PM PDT	Flash Flood Warning	VEF	San Bernardino	29 days
Aug 13, 11:08 AM PDT	Severe Thunderstorm Warning	VEF	San Bernardino	37 min
Aug 13, 12:14 PM PDT	Flash Flood Warning	VEF	San Bernardino	2 hr
Aug 13, 12:42 PM PDT	Severe Thunderstorm Warning	VEF	San Bernardino	48 min
Aug 13, 12:57 PM PDT	Severe Thunderstorm Warning	VEF	San Bernardino	48 min
Aug 13, 1:36 PM PDT	Flash Flood Warning	VEF	San Bernardino	28 days

Nearby

Flash Flood Warnings in California, 2004 Every flash flood warning in 2004

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.