Alert archive / California / Flash Flood Warnings in 2004

Flash Flood Warning 8, NWS Las Vegas, NV

August 14, 2004San Bernardino County, California

NWS Las Vegas, NV issued this flash flood warning at Aug 14, 2004, 12:45 PM PDT for San Bernardino County, California. It was in force for 28 days. 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: Aug 14, 2004, 12:45 PM PDT (19:45 UTC)
Expired: Sep 11, 2004, 4:30 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

What was reported inside it

Time	Report	Where	Remark
Sep 9, 1:16 PM PDT	FLASH FLOOD	13 E Mountain Pass, CA	DEBRIS AND ROCKS ON NIPTON RD NEAR MILE MARKER 177 ON I15
Sep 9, 7:21 PM PDT	FLASH FLOOD	9 W Nipton, CA	CALIFORNIA HIGHWAY PATROL REPORTED NIPTON RD ABOUT 500 FEET FROM INTERSTATE 15. ROADWAY IS COMPLETELY WASHED OUT.
Sep 10, 4:17 PM PDT	FLASH FLOOD	5 S Nipton, CA	LAW ENFORCEMENT REPORTED IVANPAH AND NIPTON ROADS WERE CLOSED DUE TO FLASH FLOODING.

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

The nearest sounding before it

Mercury/Desert R, NV (KDRA), launched 12:00Z, 7.8 hours before the alert went out and 132 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: 4 J/kg
Mixed-layer CIN: -376 J/kg
Mixed-layer LCL: 2220 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: -3 m²/s²
0-3 km storm-relative helicity: 32 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 141944
FFWVEF
CAC071-142115-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
1245 PM PDT SAT AUG 14 2004

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 215 PM PDT

* AT 1238 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
  VERY HEAVY RAIN FROM THUNDERSTORMS BETWEEN MOUNTAIN PASS...CIMA...
  AND IVANPAH. THE STORMS WERE NEARLY STATIONARY.

RADAR INDICATED THAT AN INCH OF RAIN HAD FALLEN SINCE 1130 AM...AND 
ANOTHER INCH OF RAIN IS POSSIBLE IN THE WARNED AREA BEFORE THE 
STORMS DIMINISH.

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.

TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN LAS
VEGAS.

LAT...LON 3557 11582 3572 11572 3568 11552 3526 11500
      3508 11560

$$

MORGAN

1 follow-up statement

000 
WGUS55 KVEF 112133
FFWVEF
CAC071-112330-
/X.NEW.KVEF.FF.W.0008.040911T2132Z-040911T2330Z/
/0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
232 PM PDT SAT SEP 11 2004

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 430 PM PDT

* AT 225 PM PDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED FLASH   
FLOODING FROM A THUNDERSTORM NEAR HIGHWAY 247 AND BIG HORN NORTH OF 
YUCCA VALLEY. RADAR ESTIMATES THAT BETWEEN 3 AND 2 AND HALF INCHES 
OF RAIN HAS FALLEN HERE FROM A STATIONARY THUNDERSTORM.

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

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.

LAT...LON 3417 11675 3418 11628 3452 11625 3452 11674

$$

JACQUES

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 14, 2:58 PM PDT	Severe Thunderstorm Warning	VEF	San Bernardino	47 min

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive.