Alert archive / California / Flash Flood Warnings in 2003

Flash Flood Warning 15, NWS Las Vegas, NV

July 31, 2003San Bernardino County, California

NWS Las Vegas, NV issued this flash flood warning at Jul 31, 2003, 2:20 PM PDT for San Bernardino County, California. It was in force for 115 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
Jul 31, 2003, 2:20 PM PDT (21:20 UTC)
Expired
Jul 31, 2003, 4:15 PM PDT
In force
115 min
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

San Diego, CA (KNKX), launched 12:00Z, 9.3 hours before the alert went out and 217 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, San Diego, CA at 12:00Z on 2003-07-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4 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, San Diego, CA at 12:00Z on 2003-07-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 37 square meters per square second.193958Sfc1 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
4 J/kg
Mixed-layer CIN
-608 J/kg
Mixed-layer LCL
1095 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
37 m²/s²
0-3 km storm-relative helicity
103 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 312119
FFWVEF
CAC071-312315-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
220 PM PDT THU JUL 31 2003

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 415 PM PDT

* AT 215 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
  A THUNDERSTORM WITH VERY HEAVY RAIN 12 MILES SOUTHWEST OF 
  BARSTOW...MOVING NORTHWEST AT 15 MPH. AS THE STORM MOVES NORTHWEST
  HEAVY RAIN AND FLASH FLOODING IS LIKELY ALONG HIGHWAYS 395 AND
  HIGHWAY 58. 

* THE CALIFORNIA HIGHWAY PATROL REPORTED THAT THE THUNDERSTORM WITH 
  HEAVY RAINFALL HAS PRODUCED FLOODING ALONG I-15 WITH LANES UNDER
  ONE OR TWO FEET OF WATER IN SPOTS. ROAD FLOODING WAS ALSO REPORTED
  NEAR THE OUTLET MALLS ON THE SOUTHWEST SIDE OF BARSTOW.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS
IMMINENT. MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER ATTEMPT
TO CROSS SWIFTLY FLOWING WATER. VEHICLES CAUGHT IN RISING WATERS
SHOULD BE ABANDONED QUICKLY.

LAT...LON 3462 11736 3458 11700 3503 11710 3491 11746

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 31, 3:41 AM PDTFlash Flood WarningVEFInyo79 min
Jul 31, 10:09 AM PDTFlash Flood WarningVEFInyo3 hr

Nearby

Flash Flood Warnings in California, 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.