Alert archive / California / Flash Flood Warnings in 2003

Flash Flood Warning 37, NWS Las Vegas, NV

August 20, 2003San Bernardino County, California; Clark County, Nevada; Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Aug 20, 2003, 7:31 PM PDT for San Bernardino County, California; Clark County, Nevada; Mohave County, Arizona. It was in force for 119 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 20, 2003, 7:31 PM PDT (02:31 UTC)
Expired
Aug 20, 2003, 9:30 PM PDT
In force
119 min
Issued by
NWS Las Vegas, NV
Area
Counties, with a storm outline in the text

Counties Mohave County, AZ, San Bernardino County, CA, Clark County, NV

The radar

The Las Vegas radar (KESX), 109 km from the middle of the area, began a volume at 02:30 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, 2.5 hours before the alert went out and 241 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 00:00Z on 2003-08-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 79 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 00:00Z on 2003-08-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 38 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
79 J/kg
Mixed-layer CIN
-102 J/kg
Mixed-layer LCL
1940 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
38 m²/s²
0-3 km storm-relative helicity
36 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 210235
FFWVEF
AZC015-CAC071-NVC003-210430-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
731 PM PDT WED AUG 20 2003

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHWESTERN MOHAVE COUNTY IN NORTHWEST ARIZONA
  EAST CENTRAL SAN BERNARDINO COUNTY IN SOUTHEAST CALIFORNIA
  EXTREME SOUTH CENTRAL CLARK COUNTY IN SOUTHERN NEVADA

* UNTIL 930 PM PDT(930 PM MST)

* AT 731 PM PDT(731 PM MST)...SKYWARN WEATHER SPOTTERS REPORTED
  VERY HEAVY RAIN IN NEEDLES...MOVING NORTHEAST AT 15 MPH. IN
  ADDITION CALIFORNIA HIGHWAY PATROL REPORTS THAT FLOODING HAS
  OCCURRED ALONG HIGHWAY 95 NEAR MILE MARKER 37.  

* THE THUNDERSTORM WITH EXCESSIVE RAINFALL WILL BE...
  NEAR MOHAVE VALLEY AT 745 PM MST
  NEAR LAUGHLIN AT 800 PM MST

LAT...LON 3447 11478 3447 11449 3512 11448 3514 11493

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 20, 5:00 PM PDTFlash Flood WarningVEFSan Bernardino2 hr
Aug 20, 8:42 PM PDTFlash Flood WarningVEFInyo93 min

Nearby

Flash Flood Warnings in California, 2003Flash Flood Warnings in Nevada, 2003Flash Flood Warnings in Arizona, 2003Every flash flood warning in 2003

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.