Alert archive / California / Flash Flood Warnings in 2012

Flash Flood Warning 32, NWS Las Vegas, NV

July 14, 2012San Bernardino County, California

NWS Las Vegas, NV issued this flash flood warning at Jul 14, 2012, 7:25 PM PDT for San Bernardino County, California. It was in force for 3 hr. 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 14, 2012, 7:25 PM PDT (02:25 UTC)
Expired
Jul 14, 2012, 10:15 PM PDT
In force
3 hr
Issued by
NWS Las Vegas, NV
Area
Storm-based polygon
Flood severity
None

County San Bernardino County, CA

The radar

The Las Vegas radar (KESX), 141 km from the middle of the area, began a volume at 02:28 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

Las Vegas, NV (KVEF), launched 00:00Z, 2.4 hours before the alert went out and 231 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, Las Vegas, NV at 00:00Z on 2012-07-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 48 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, Las Vegas, NV at 00:00Z on 2012-07-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -8 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
48 J/kg
Mixed-layer CIN
-202 J/kg
Mixed-layer LCL
2462 m above ground
0-6 km bulk shear
2 kt
0-1 km storm-relative helicity
-8 m²/s²
0-3 km storm-relative helicity
-43 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.

270 
WGUS55 KVEF 150225
FFWVEF
CAC071-150515-
/O.NEW.KVEF.FF.W.0032.120715T0225Z-120715T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
725 PM PDT SAT JUL 14 2012

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 1015 PM PDT.

* AT 719 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM THUNDERSTORMS ALONG A LINE EXTENDING FROM EAST
  CENTRAL SAN BERNARDINO COUNTY TO EXTREME EAST CENTRAL SAN
  BERNARDINO COUNTY...OR ALONG A LINE EXTENDING FROM 27 MILES WEST OF
  TOPOCK TO LAKE HAVASU CITY. THE STORMS PRODUCING VERY HEAVY RAIN
  WERE NEARLY STATIONARY.

* LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF EXTREME EASTERN SAN BERNARDINO COUNTY. 
  HIGHWAY 95 IS INCLUDED DUE TO RAIN OVER THE AREA AND ALSO BECAUSE 
  RUNOFF FROM HEAVY RAIN EARLIER FLOWING THROUGH CHEMEHUEVI WASH MAY 
  FLOOD THE ROAD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLASH FLOODING IS EXPECTED IN WASHES...LOW WATER CROSSINGS AND ON
AREA ROADWAYS. FLASH FLOODING IS NATURES NUMBER ONE KILLER. TO ESCAPE
RISING WATER...MOVE TO HIGHER GROUND. NEVER TRY TO CROSS A FLOODED
ROADWAY OR WALK THROUGH FLOODWATERS. TURN AROUND...DONT DROWN!

REPORT FLOODING BY POSTING YOUR REPORT TO THE LAS VEGAS NATIONAL
WEATHER SERVICE FACEBOOK PAGE...OR BY USING THE TWITTER HASHTAG...
NWSVEGAS.

&&

LAT...LON 3460 11492 3459 11474 3465 11448 3453 11439
      3446 11439 3444 11438 3444 11434 3442 11431
      3441 11430 3439 11426 3436 11423 3433 11417
      3430 11439 3430 11519 3460 11520

$$

JH
2 follow-up statements
824 
WGUS75 KVEF 150342
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
842 PM PDT SAT JUL 14 2012

CAC071-150515-
/O.CON.KVEF.FF.W.0032.000000T0000Z-120715T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
842 PM PDT SAT JUL 14 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1015 PM PDT FOR EAST
CENTRAL SAN BERNARDINO COUNTY...

AT 837 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE THUNDERSTORM PRODUCING HEAVY RAIN.  THE STORMS WERE LOCATED 
OVER EXTREME EAST CENTRAL SAN BERNARDINO COUNTY...OR WEST OF LAKE 
HAVASU CITY AND WESTWARD ACROSS HIGHWAY 95. THE THUNDERSTORMS WITH 
HEAVY RAIN WERE NEARLY STATIONARY.

LOCATIONS IMPACTED INCLUDE...HIGHWAY 95...ESPECIALLY WHERE 
CHEMEHUEVI WASH CROSSES NEAR MILE MARKER 29.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLASH FLOODING IS EXPECTED IN WASHES...LOW WATER CROSSINGS AND ON
AREA ROADWAYS. FLASH FLOODING IS NATURES NUMBER ONE KILLER. TO ESCAPE
RISING WATER...MOVE TO HIGHER GROUND. NEVER TRY TO CROSS A FLOODED
ROADWAY OR WALK THROUGH FLOODWATERS. TURN AROUND...DONT DROWN!

REPORT FLOODING BY POSTING YOUR REPORT TO THE LAS VEGAS NATIONAL
WEATHER SERVICE FACEBOOK PAGE...OR BY USING THE TWITTER HASHTAG...
NWSVEGAS.

&&

LAT...LON 3460 11492 3459 11474 3465 11448 3453 11439
      3446 11439 3444 11438 3444 11434 3442 11431
      3441 11430 3439 11426 3436 11423 3433 11417
      3430 11439 3430 11519 3460 11520

$$

JH
909 
WGUS75 KVEF 150510
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
1010 PM PDT SAT JUL 14 2012

CAC071-150519-
/O.EXP.KVEF.FF.W.0032.000000T0000Z-120715T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
1010 PM PDT SAT JUL 14 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 1015 PM PDT FOR EAST
CENTRAL SAN BERNARDINO COUNTY...

RAINFALL DECREASED IN THE WARNING AREA AND THERE HAVE BEEN NO 
REPORTS OF FLOODING. KEEP IN MIND THAT MORE THUNDERSTORMS COULD MOVE 
INTO THE AREA THROUGH TONIGHT WHICH COULD IMPACT HIGHWAY 95.

LAT...LON 3460 11492 3459 11474 3465 11448 3453 11439
      3446 11439 3444 11438 3444 11434 3442 11431
      3441 11430 3439 11426 3436 11423 3433 11417
      3430 11439 3430 11519 3460 11520

$$

JH

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 14, 8:50 PM PDTAreal Flood AdvisoryVEFSan Bernardino27 min
Jul 14, 9:16 PM PDTFlash Flood WarningVEFSan Bernardino119 min
Jul 14, 11:35 PM PDTSevere Thunderstorm WarningVEFSan Bernardino40 min
Jul 15, 12:29 AM PDTFlash Flood WarningVEFSan Bernardino2 hr
Jul 15, 10:14 AM PDTFlash Flood WatchVEFSan Bernardino11 hr
Jul 15, 11:52 AM PDTFlash Flood WarningVEFSan Bernardino3 hr
Jul 15, 11:59 AM PDTFlash Flood WarningVEFInyo2 hr
Jul 15, 2:20 PM PDTAreal Flood AdvisoryVEFSan Bernardino115 min
Jul 15, 3:07 PM PDTSevere Thunderstorm WarningVEFSan Bernardino38 min
Jul 15, 4:52 PM PDTSevere Thunderstorm WarningVEFSan Bernardino38 min

Nearby

Flash Flood Warnings in California, 2012Every flash flood warning in 2012

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.