Alert archive / California / Flash Flood Warnings in 2007

Flash Flood Warning 13, NWS Las Vegas, NV

July 25, 2007San Bernardino County, California

NWS Las Vegas, NV issued this flash flood warning at Jul 25, 2007, 3:00 PM PDT for San Bernardino County, California. It was in force for 2 hr. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jul 25, 2007, 3:00 PM PDT (22:00 UTC)
Expired: Jul 25, 2007, 5:00 PM PDT
In force: 2 hr
Issued by: NWS Las Vegas, NV
Area: Whole counties

County San Bernardino County, CA

What was reported inside it

Time	Report	Where	Remark
Jul 25, 3:45 PM PDT	FLASH FLOOD	Needles, CA	WATER OVER THE ROAD I40 FROM NEEDLES TO LAUGHLIN. WASHES ALONG US HWY 95 N AND S RUNNING HIGH.

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, 10.0 hours before the alert went out and 198 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: 133 J/kg
Mixed-layer CIN: -159 J/kg
Mixed-layer LCL: 1881 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 18 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 252202
FFWVEF
CAC071-260000-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
300 PM PDT WED JUL 25 2007

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 500 PM PDT.

* AT 300 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM A THUNDERSTORM OVER THE WARNED AREA.

* THE STORM PRODUCING FLASH FLOODING WILL REMAIN NEAR THE DEAD 
MOUNTAINS AND WILL IMPACT INTERSTATE 40 BETWEEN NEEDLES AND HIGHWAY 
95 AS WELL AS HIGHWAY 95 NORTH THROUGH ARROWHEAD JUNCTION NORTHWARD 
TO MILE MARKER 72.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE WATER COVERS THE ROADWAY.
THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY.
TURN AROUND...DONT DROWN.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY. DO
NOT ATTEMPT TO CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN
DEPTH BY FOOT OR BY AUTOMOBILE. TURN AROUND...DONT DROWN.

LAT...LON 3489 11497 3489 11464 3505 11470 3507 11497

$$
SC

1 follow-up statement

000
WGUS75 KVEF 252337
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
434 PM PDT WED JUL 25 2007

CAC071-260000-
SAN BERNARDINO CA-
434 PM PDT WED JUL 25 2007

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 500 PM PDT FOR EAST
CENTRAL SAN BERNARDINO COUNTY...

AT 424 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A THUNDERSTORM PRODUCING FLASH FLOODING OVER THE WARNED
AREA.

SEVERAL TRAINED STORM SPOTTERS HAVE REPORTED FLOODING IN THE 
VICINITY OF NEEDLES AND NEEDLES HIGHWAY FROM INTERSTATE 40 TO THE 
NEVADA STATE LINE HAS BEEN CLOSED DUE TO FLOODING. 

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.

LAT...LON 3489 11497 3489 11464 3505 11470 3507 11497

$$

ASG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 24, 5:01 PM PDT	Flash Flood Warning	VEF	San Bernardino	44 min
Jul 25, 9:56 AM PDT	Flash Flood Watch	VEF	San Bernardino	11 hr
Jul 25, 12:54 PM PDT	Flash Flood Warning	VEF	San Bernardino	2 hr
Jul 25, 3:53 PM PDT	Severe Thunderstorm Warning	VEF	San Bernardino	67 min

Nearby

Flash Flood Warnings in California, 2007 Every flash flood warning in 2007

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.