Alert archive / California / Flash Flood Warnings in 2004

Flash Flood Warning 11, NWS Las Vegas, NV

August 15, 2004San Bernardino County, California

NWS Las Vegas, NV issued this flash flood warning at Aug 15, 2004, 11:14 AM PDT for San Bernardino County, California. It was in force for 27 days. 1 report 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 15, 2004, 11:14 AM PDT (18:14 UTC)
Expired
Sep 11, 2004, 8:30 PM PDT
In force
27 days
Issued by
NWS Las Vegas, NV
Area
Counties, with a storm outline in the text

County San Bernardino County, CA

The radar

The Las Vegas radar (KESX), 65 km from the middle of the area, began a volume at 18:15 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
Sep 10, 4:17 PM PDTFLASH FLOOD5 S Nipton, CALAW 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, 6.2 hours before the alert went out and 172 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, Mercury/Desert R, NV at 12:00Z on 2004-08-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 132 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, Mercury/Desert R, NV at 12:00Z on 2004-08-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 67 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
132 J/kg
Mixed-layer CIN
-93 J/kg
Mixed-layer LCL
1859 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
67 m²/s²
0-3 km storm-relative helicity
140 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 151813
FFWVEF
CAC071-152015-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
1114 AM PDT SUN AUG 15 2004

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 115 PM PDT

* AT 1111 AM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
  SEVERAL THUNDERSTORMS WITH VERY HEAVY RAIN OVER THE MOJAVE 
  NATIONAL PRESERVE IN EAST CENTRAL SAN BERNARDINO COUNTY. THESE 
  STORMS WERE MOVING SLOWLY SOUTH. RADAR ESTIMATED OVER TWO INCHES OF
  RAIN PER HOUR WITH SOME OF THESE STORMS...WHICH WOULD CAUSE FLASH
  FLOODING OF LOW AREAS.

ANYONE IN THE MOJAVE NATIONAL PRESERVE SHOULD MOVE TO HIGH GROUND 
IMMEDIATELY. IN HILLY TERRAIN THERE ARE HUNDREDS OF LOW WATER 
CROSSINGS WHICH ARE POTENTIALLY DANGEROUS IN HEAVY RAIN. DO NOT 
ATTEMPT TO TRAVEL ACROSS FLOODED ROADS. FIND ALTERNATE ROUTES. IT 
ONLY TAKES A FEW INCHES OF SWIFTLY FLOWING WATER TO CARRY VEHICLES 
AWAY.

LAT...LON 3537 11509 3546 11557 3503 11561 3483 11533
      3514 11482

$$

MORGAN
1 follow-up statement
000 
WGUS55 KVEF 120033
FFWVEF
CAC071-120330-
/X.NEW.KVEF.FF.W.0011.040912T0031Z-040912T0330Z/
/0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 830 PM PDT

* AT 521 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM A THUNDERSTORM OVER CENTRAL SAN BERNARDINO
  COUNTY...OR ABOUT 15 MILES NORTHEAST OF BARSTOW...MOVING SOUTH AT 5    
  MPH. FLASH FLOODING IS EXPECTED ALONG IRWIN ROAD. 

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

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING 
WASHES...ROADWAYS AND SMALL CREEKS.

LAT...LON 3496 11703 3493 11677 3522 11670 3523 11697

$$

PIERCE

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 14, 6:11 PM PDTSevere Thunderstorm WarningVEFSan Bernardino34 min
Aug 14, 6:23 PM PDTFlash Flood WarningVEFSan Bernardino28 days
Aug 14, 8:10 PM PDTSevere Thunderstorm WarningVEFSan Bernardino35 min
Aug 15, 3:16 AM PDTFlash Flood WarningVEFInyo, San Bernardino28 days
Aug 15, 11:04 AM PDTSevere Thunderstorm WarningVEFSan Bernardino41 min
Aug 15, 12:15 PM PDTFlash Flood WarningVEFInyo, San Bernardino27 days
Aug 15, 1:28 PM PDTSevere Thunderstorm WarningVEFSan Bernardino47 min
Aug 15, 1:33 PM PDTSevere Thunderstorm WarningVEFSan Bernardino42 min
Aug 15, 3:07 PM PDTFlash Flood WarningVEFSan Bernardino113 min

Nearby

Flash Flood Warnings in California, 2004Every 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; radar from the NEXRAD Level II archive.