Alert archive / California / Flash Flood Warnings in 2004

Flash Flood Warning 2, NWS Las Vegas, NV

August 11, 2004San Bernardino County, California; Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Aug 11, 2004, 10:00 PM PDT for San Bernardino County, California; Mohave County, Arizona. It was in force for 29 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 11, 2004, 10:00 PM PDT (05:00 UTC)
Expired: Sep 9, 2004, 1:30 PM PDT
In force: 29 days
Issued by: NWS Las Vegas, NV
Area: Counties, with a storm outline in the text

Counties Mohave County, AZ, San Bernardino County, CA

The radar

The Las Vegas radar (KESX), 79 km from the middle of the area, began a volume at 05:03 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

Mercury/Desert R, NV (KDRA), launched 00:00Z, 5.0 hours before the alert went out and 218 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 5528 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: -20 m²/s²
0-3 km storm-relative helicity: -29 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 120502
FFWVEF
AZC015-120600-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
1000 PM MST WED AUG 11 2004

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EXTREME WEST CENTRAL MOHAVE COUNTY IN NORTHWEST ARIZONA

* UNTIL 1100 PM MST

* AT 957 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  HEAVY RAIN FROM A THUNDERSTORM ABOUT 8 MILES SOUTH OF BULLHEAD 
  CITY...MOVING SOUTH AT 5 MPH.

* THE THUNDERSTORM PRODUCING FLASH FLOODING WILL BE NEAR...
  FORT MOHAVE AT 1030 PM MST

ADDITIONAL RAINFALL AMOUNTS UP TO ONE INCH ARE POSSIBLE ALONG 
HIGHWAY 95 BETWEEN BULLHEAD CITY AND MOHAVE VALLEY.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE 
ROADWAY. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY.
MOVE TO HIGHER GROUND.

LAT...LON 3509 11452 3509 11465 3497 11461 3497 11454

$$

ADAIR

1 follow-up statement

000 
WGUS55 KVEF 091841
FFWVEF
CAC071-092030-
/X.NEW.KVEF.FF.W.0002.040909T1837Z-040909T2030Z/
/0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
1137 AM PDT THU SEP 9 2004

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 130 PM PDT

* AT 1136 AM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
  STRONG THUNDERSTORMS OVER THE MOJAVE NATIONAL PRESERVE...NEAR THE 
  COMMUNITIES OF IVANPAH AND CIMA. THESE STORMS WERE NEARLY 
  STATIONARY. RADAR INDICATED ONE AND ONE HALF INCHES OF RAIN HAD 
  ALREADY FALLEN IN THE WARNED AREA.

* THE STORM PRODUCING FLASH FLOODING WILL OTHERWISE REMAIN OVER 
  MAINLY RURAL AREAS OF NORTH CENTRAL SAN BERNARDINO COUNTY.

ADDITIONAL RAINFALL AMOUNTS OF ONE TO THREE INCHES ARE POSSIBLE IN 
THE WARNED AREA. ANYONE IN THE MOJAVE NATIONAL PRESERVE SHOULD HEAD 
FOR 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 3520 11546 3520 11524 3546 11531 3545 11561

$$

MORGAN

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 12, 1:46 PM PDT	Severe Thunderstorm Warning	VEF	San Bernardino	44 min
Aug 12, 2:00 PM PDT	Flash Flood Warning	VEF	San Bernardino	28 days
Aug 12, 2:33 PM PDT	Severe Thunderstorm Warning	VEF	San Bernardino	42 min

Nearby

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