Alert archive / California / Flash Flood Warnings in 2012

Flash Flood Warning 14, NWS Las Vegas, NV

July 13, 2012San Bernardino County, California

NWS Las Vegas, NV issued this flash flood warning at Jul 13, 2012, 6:00 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 outline as issued, with what was reported inside it.

The facts

Issued
Jul 13, 2012, 6:00 PM PDT (01:00 UTC)
Expired
Jul 13, 2012, 8:00 PM PDT
In force
2 hr
Issued by
NWS Las Vegas, NV
Area
Storm-based polygon
Flood severity
None

County San Bernardino County, CA

The radar

The Santa Ana Mts radar (KSOX), 166 km from the middle of the area, began a volume at 01:01 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 13, 7:07 PM PDTFLASH FLOODTwentynine Palms, CASIGNIFICANT FLOODING AFFECTED HIGHWAY 62 FROM YUCCA VALLEY THROUGH AREAS EAST OF TWENTYNINE PALMS. WATER AND BOULDERS COVERED THE ROAD, PARTS OF THE ROAD AND SHOULDERS CAVED IN, AND NUMEROUS VEHICLES WERE STUCK. CONDITIONS IMPROVED AROUND 10 PM.

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

The nearest sounding before it

San Diego, CA (KNKX), launched 00:00Z, 1.0 hours before the alert went out and 191 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 00:00Z on 2012-07-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 00:00Z on 2012-07-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 0 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1903 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
0 m²/s²
0-3 km storm-relative helicity
76 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.

799 
WGUS55 KVEF 140100
FFWVEF
CAC071-140300-
/O.NEW.KVEF.FF.W.0014.120714T0100Z-120714T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
600 PM PDT FRI JUL 13 2012

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 800 PM PDT.

* AT 555 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM NEAR WEST WIND AERO...OR NEAR
  TWENTYNINE PALMS. THE STORM PRODUCING VERY HEAVY RAIN WAS NEARLY   
  STATIONARY. RAINFALL TOTALS ESTIMATED BY RADAR IN THE LAST HOUR    
  ARE AT LEAST A HALF AN INCH.

* LOCATIONS IMPACTED INCLUDE...
  TWENTYNINE PALMS...WEST WIND AERO...TWENTYNINE PALMS MCAS AND      
  JOSHUA TREE LAKE CAMPGROUND. TRAVELERS ALONG HIGHWAY 62 SHOULD BE  
  ALERT FOR WATER AND DEBRIS POTENTIALLY CROSSING THE ROAD.

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 3408 11600 3412 11606 3412 11626 3408 11627
      3408 11632 3428 11631 3424 11529 3407 11533
      3412 11553 3407 11555 3409 11561 3404 11560
      3404 11600

$$

STACHELSKI
2 follow-up statements
131 
WGUS75 KVEF 140212
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
712 PM PDT FRI JUL 13 2012

CAC071-140300-
/O.CON.KVEF.FF.W.0014.000000T0000Z-120714T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
712 PM PDT FRI JUL 13 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 800 PM PDT FOR SOUTH
CENTRAL SAN BERNARDINO COUNTY...

AT 705 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A SERIES OF THUNDERSTORMS PRODUCING VERY HEAVY RAIN EAST PF 
TWENTYNINE PALMS. THESE STORMS WERE MOVING NORTHEAST AT 10 TO 15 MPH.

LOCATIONS IMPACTED INCLUDE...
TWENTYNINE PALMS...TWENTYNINE PALMS MCAS AND JOSHUA TREE LAKE 
CAMPGROUND AS WELL AS HIGHWAY 62 FROM TWENTYNINE PALMS FROM MILE 
MARKER 78 EAST OF TWENTYNINE PALMS.

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 3408 11600 3412 11606 3412 11626 3408 11627
      3408 11632 3428 11631 3424 11529 3407 11533
      3412 11553 3407 11555 3409 11561 3404 11560
      3404 11600

$$

STACHELSKI
516 
WGUS75 KVEF 140303
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
803 PM PDT FRI JUL 13 2012

CAC071-140312-
/O.EXP.KVEF.FF.W.0014.000000T0000Z-120714T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
803 PM PDT FRI JUL 13 2012

...THE FLASH FLOOD WARNING HAS BEEN REPLACED WITH A NEW FLASH FLOOD 
WARNING FOR SOUTH CENTRAL SAN BERNARDINO COUNTY...

FLASH FLOODING CONTINUES ACROSS SOUTH CENTRAL SAN BERNARDINO COUNTY 
AND A NEW WARNING HAS BEEN ISSUED FOR THIS AREA. 

LAT...LON 3408 11600 3412 11606 3412 11626 3408 11627
      3408 11632 3428 11631 3424 11529 3407 11533
      3412 11553 3407 11555 3409 11561 3404 11560
      3404 11600

$$

STACHELSKI

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, 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 14, 4:38 PM PDTFlash Flood WarningVEFSan Bernardino3 hr

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.