Alert archive / California / Flash Flood Warnings in 2012

Flash Flood Warning 27, NWS Las Vegas, NV

July 14, 2012San Bernardino County, California; Clark County, Nevada; Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Jul 14, 2012, 4:38 PM PDT for San Bernardino County, California; Clark County, Nevada; Mohave County, Arizona. It was in force for 3 hr. 5 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Jul 14, 2012, 4:38 PM PDT (23:38 UTC)
Expired
Jul 14, 2012, 7:45 PM PDT
In force
3 hr
Issued by
NWS Las Vegas, NV
Area
Storm-based polygon
Flood severity
None

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

The radar

The Las Vegas radar (KESX), 95 km from the middle of the area, began a volume at 23:39 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.

What was reported inside it

TimeReportWhereRemark
Jul 14, 4:40 PM PDTHEAVY RAIN 0.42 Nne Mohave Valley, AZTRAINED SPOTTER REPORTED 0.40 INCHES OF RAIN IN 10 MINUTES NEAR MOHAVE VALLEY.
Jul 14, 4:40 PM PDTHEAVY RAIN 13 Sse Mohave Valley, AZTRAINED SPOTTER REPORTED 1.00 INCHES OF RAIN IN 45 MINUTES.
Jul 14, 4:45 PM PDTHEAVY RAIN 0.5Mohave Valley, AZMOHAVE VALLEY FIRE DEPARTMENT REPORTED AT LEAST 3 INCHES OF WATER ON STREETS AND WASHES STARTING TO FLOW.
Jul 14, 5:14 PM PDTHEAVY RAIN 1.52 N Needles, AZTRAINED SPOTTER REPORTED 1.5 INCHES OF RAIN IN 30 MINUTES IN RAIN GAUGE.
Jul 14, 6:41 PM PDTFLASH FLOOD3 Sw Oatman, AZREPORT FROM OATMAN FIRE DEPARTMENT THAT RESCUE VEHICLES COULD NOT CROSS FLOODED ROADWAY NEAR BOUNDARY CONE ROAD AND OATMAN HIGHWAY.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Las Vegas, NV (KVEF), launched 12:00Z, 11.6 hours before the alert went out and 185 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 12:00Z on 2012-07-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 372 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 12:00Z on 2012-07-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 27 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
372 J/kg
Mixed-layer CIN
-151 J/kg
Mixed-layer LCL
1206 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
27 m²/s²
0-3 km storm-relative helicity
20 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

346 
WGUS55 KVEF 142338
FFWVEF
AZC015-CAC071-NVC003-150145-
/O.NEW.KVEF.FF.W.0027.120714T2338Z-120715T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

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 SOUTHERN CALIFORNIA...
  EXTREME SOUTH CENTRAL CLARK COUNTY IN SOUTHERN NEVADA...

* UNTIL 645 PM PDT/645 PM MST/.

* AT 431 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM NEAR HIGHWAY 95 AND I-40...OR
  18 MILES SOUTHWEST OF LAUGHLIN. THE STORM PRODUCING VERY HEAVY RAIN
  WAS NEARLY STATIONARY.

* LOCATIONS IMPACTED INCLUDE...
  MOHAVE VALLEY...RIVERSIDE ADVENTURE RV PARK AND BIG BEND REC AREA.

THIS INCLUDES INTERSTATE 40 IN CALIFORNIA BETWEEN MILE MARKERS 125
AND 149.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLASH FLOODING IS EXPECTED ON AREA ROADWAYS...AROUND UNDERPASSES...
AND IN NORMALLY DRY WASHES AND LOW LYING AREAS. FLASH FLOODING IS
NATURES NUMBER ONE KILLER. 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 3478 11493 3504 11482 3513 11469 3512 11454
      3498 11437 3467 11463 3459 11475 3460 11486

$$

JENSEN
4 follow-up statements
319 
WGUS75 KVEF 150056
FFSVEF

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

AZC015-CAC071-NVC003-150145-
/O.CON.KVEF.FF.W.0027.000000T0000Z-120715T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-SAN BERNARDINO CA-CLARK NV-
556 PM PDT SAT JUL 14 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 645 PM PDT/645 PM
MST/ FOR EXTREME SOUTH CENTRAL CLARK...EAST CENTRAL SAN BERNARDINO
AND SOUTHWESTERN MOHAVE COUNTIES...

AT 549 PM PDT...TRAINED WEATHER SPOTTERS REPORTED A THUNDERSTORM
PRODUCING FLASH FLOODING.  THIS STORM WAS LOCATED NEAR HIGHWAY 95 AND
I-40...OR 21 MILES SOUTHWEST OF LAUGHLIN. THE THUNDERSTORM WITH
EXCESSIVE RAIN WAS NEARLY STATIONARY.

LOCATIONS IMPACTED INCLUDE...
MOHAVE VALLEY...RIVERSIDE ADVENTURE RV PARK AND BIG BEND REC AREA.

THIS INCLUDES INTERSTATE 40 IN CALIFORNIA BETWEEN MILE MARKERS 126
AND 149.

MANY REPORTS OF VERY HEAVY RAINFALL...POWER OUTAGES...AND WATER 
RUNNING ACROSS THE ROADWAYS HAVE BEEN RECEIVED SINCE 5 PM PDT/ 5 PM 
MST IN THE MOHAVE VALLEY AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLASH FLOODING IS EXPECTED ON AREA ROADWAYS...AROUND UNDERPASSES...
AND IN NORMALLY DRY WASHES AND LOW LYING AREAS. FLASH FLOODING IS
NATURES NUMBER ONE KILLER. 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 3478 11493 3504 11482 3513 11469 3512 11454
      3498 11437 3467 11463 3459 11475 3460 11486

$$

JENSEN
739 
WGUS55 KVEF 150142
FFWVEF
AZC015-CAC071-NVC003-150245-
/O.EXT.KVEF.FF.W.0027.000000T0000Z-120715T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS EXTENDED THE

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

* UNTIL 745 PM PDT/745 PM MST/.

* AT 636 PM PDT...TRAINED WEATHER SPOTTERS REPORTED FLASH FLOODING   
FROM THUNDERSTORMS IN MOHAVE VALLEY. MORE STORMS WITH HEAVY RAIN 
CONTINUED TO DEVELOP OR MOVE INTO THE AREA SO ADDITIONAL FLOODING 
REMAINS LIKELY IN THE WARNING AREA.

* LOCATIONS IMPACTED INCLUDE...
  MOHAVE VALLEY...RIVERSIDE ADVENTURE RV PARK AND BIG BEND REC AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLASH FLOODING IS EXPECTED ON AREA ROADWAYS...AROUND UNDERPASSES...
AND IN NORMALLY DRY WASHES AND LOW LYING AREAS. FLASH FLOODING IS
NATURES NUMBER ONE KILLER. 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 3478 11493 3504 11482 3513 11469 3512 11454
      3498 11437 3467 11463 3459 11475 3460 11486

$$

JH
524 
WGUS75 KVEF 150224
FFSVEF

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

AZC015-CAC071-NVC003-150245-
/O.CON.KVEF.FF.W.0027.000000T0000Z-120715T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-SAN BERNARDINO CA-CLARK NV-
724 PM PDT SAT JUL 14 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 745 PM PDT/745 PM
MST/ FOR EXTREME SOUTH CENTRAL CLARK...EAST CENTRAL SAN BERNARDINO
AND SOUTHWESTERN MOHAVE COUNTIES...

AT 715 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A THUNDERSTORM PRODUCING HEAVY RAINFALL.  THIS STORM WAS 
LOCATED 10 MILES SOUTHWEST OF NEEDLES...OR 15 MILES WEST OF TOPOCK. 
THE THUNDERSTORM WITH EXCESSIVE RAIN WAS NEARLY STATIONARY.

LOCATIONS IMPACTED INCLUDE...
NEEDLES...NEEDLES KOA CAMPGROUND...HIGHWAY 95 AND I-40...MOHAVE
VALLEY...RIVERSIDE ADVENTURE RV PARK AND BIG BEND REC AREA.

THIS INCLUDES INTERSTATE 40 IN CALIFORNIA BETWEEN MILE MARKERS 126
AND 149.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLASH FLOODING IS EXPECTED ON AREA ROADWAYS...AROUND UNDERPASSES...
AND IN NORMALLY DRY WASHES AND LOW LYING AREAS. FLASH FLOODING IS
NATURES NUMBER ONE KILLER. 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 3478 11493 3504 11482 3513 11469 3512 11454
      3498 11437 3467 11463 3459 11475 3460 11486

$$

JENSEN
792 
WGUS75 KVEF 150244 RRA
FFSVEF

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

AZC015-CAC071-NVC003-150253-
/O.EXP.KVEF.FF.W.0027.000000T0000Z-120715T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-SAN BERNARDINO CA-CLARK NV-
744 PM PDT SAT JUL 14 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 745 PM PDT/745 PM MST/ FOR
EXTREME SOUTH CENTRAL CLARK...EAST CENTRAL SAN BERNARDINO AND
SOUTHWESTERN MOHAVE COUNTIES...

THIS INCLUDES INTERSTATE 40 IN CALIFORNIA BETWEEN MILE MARKERS 126
AND 149.

REPORTS FROM THE MOHAVE COUNTY SHERIFFS OFFICE IS THAT WATER IS 
SLOWLY RECEDING FROM THE AREA AND FURTHER THUNDERSTORMS ARE NOT 
EXPECTED OVER THE AREA. THUS WILL ALLOW THE FLASH FLOOD WARNING TO 
EXPIRE AS OF 745 PM PDT/ 745 MST THIS EVENING.

LAT...LON 3478 11493 3504 11482 3513 11469 3512 11454
      3498 11437 3467 11463 3459 11475 3460 11486

$$

JENSEN

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 13, 5:35 PM PDTFlash Flood WarningVEFSan Bernardino115 min
Jul 13, 5:55 PM PDTFlash Flood WarningVEFInyo2 hr
Jul 13, 6:00 PM PDTFlash Flood WarningVEFSan Bernardino2 hr
Jul 13, 7:20 PM PDTFlash Flood WarningVEFSan Bernardino115 min
Jul 13, 8:00 PM PDTFlash Flood WarningVEFSan Bernardino61 min
Jul 13, 8:50 PM PDTFlash Flood WarningVEFSan Bernardino115 min
Jul 13, 9:39 PM PDTFlash Flood WarningVEFSan Bernardino81 min
Jul 13, 11:46 PM PDTFlash Flood WarningVEFSan Bernardino97 min
Jul 14, 12:19 AM PDTFlash Flood WarningVEFInyo86 min
Jul 14, 1:09 PM PDTAreal Flood AdvisoryVEFSan Bernardino35 min
Jul 14, 1:19 PM PDTFlash Flood WarningVEFSan Bernardino3 min
Jul 14, 1:34 PM PDTAreal Flood AdvisoryVEFSan Bernardino3 hr
Jul 14, 1:36 PM PDTFlash Flood WarningVEFSan Bernardino114 min
Jul 14, 1:42 PM PDTSevere Thunderstorm WarningVEFSan Bernardino21 min
Jul 14, 4:22 PM PDTSevere Thunderstorm WarningVEFSan Bernardino38 min
Jul 14, 4:29 PM PDTAreal Flood AdvisoryVEFSan Bernardino2 hr
Jul 14, 4:33 PM PDTFlash Flood WarningVEFSan Bernardino117 min
Jul 13, 5:27 PM PDTFlash Flood WarningVEFClark2 hr
Jul 14, 2:24 AM PDTAreal Flood AdvisoryVEFClark48 min
Jul 14, 3:05 AM PDTAreal Flood AdvisoryVEFClark44 min
Jul 14, 1:28 PM PDTFlash Flood WarningVEFMohave4 hr
Jul 14, 2:00 PM PDTAreal Flood AdvisoryVEFMohave2 hr
Jul 14, 3:17 PM PDTFlash Flood WarningVEFMohave118 min
Jul 14, 3:27 PM PDTFlash Flood WarningVEFMohave5 hr
Jul 14, 4:03 PM PDTAreal Flood AdvisoryVEFMohave57 min
Jul 14, 4:42 PM PDTFlash Flood WarningVEFMohave3 hr

Nearby

Flash Flood Warnings in California, 2012Flash Flood Warnings in Nevada, 2012Flash Flood Warnings in Arizona, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.