Alert archive / California / Flash Flood Warnings in 2012

Flash Flood Warning 17, NWS Las Vegas, NV

July 13, 2012San Bernardino County, California

NWS Las Vegas, NV issued this flash flood warning at Jul 13, 2012, 8:50 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 13, 2012, 8:50 PM PDT (03:50 UTC)
Expired
Jul 13, 2012, 10:45 PM PDT
In force
115 min
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), 89 km from the middle of the area, began a volume at 03:50 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, 3.8 hours before the alert went out and 150 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 2012-07-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 90 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 2012-07-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 54 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
90 J/kg
Mixed-layer CIN
-76 J/kg
Mixed-layer LCL
1887 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
54 m²/s²
0-3 km storm-relative helicity
104 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.

182 
WGUS55 KVEF 140350
FFWVEF
CAC071-140545-
/O.NEW.KVEF.FF.W.0017.120714T0350Z-120714T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 1045 PM PDT.

* AT 841 PM PDT...CALIFORNIA HIGHWAY PATROL REPORTED ROADWAY         
  FLOODING ON KELSO CIMA ROAD AND KELBAKER ROAD NEAR KELSO. NATIONAL 
  WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY RAIN FROM       
  THUNDERSTORMS NEAR KELSO AND ALSO HOLE IN THE WALL CAMPGROUND AND  
  SOUTH TO ESSEX...MOVING NORTHEAST AT 10 MPH.

* LOCATIONS IMPACTED INCLUDE...
  KELSO...KELSO CIMA ROAD...KELBAKER ROAD...HOLE IN THE WALL         
  CAMPGROUND...BLACK CANYON EQUESTRIAN CAMPGROUND AND MID HILLS      
  CAMPGROUND.

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 3516 11574 3518 11516 3505 11519 3489 11506
      3473 11565

$$

JS
2 follow-up statements
305 
WGUS75 KVEF 140453
FFSVEF

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

CAC071-140545-
/O.CON.KVEF.FF.W.0017.000000T0000Z-120714T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
953 PM PDT FRI JUL 13 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1045 PM PDT FOR
CENTRAL SAN BERNARDINO COUNTY...

AT 947 PM PDT...THUNDERSTORMS IN THE WARNING AREA HAD DISSIPATED 
HOWEVER...RUNOFF FROM THE EARLIER HEAVY RAIN WILL CONTINUE TO FLOW 
IN WASHES AND COULD IMPACT LOW WATER CROSSINGS ON AREA ROADWAYS 
THROUGH 1045 PM. NIGHT TIME FLOODING IS HARD TO SEE AND MOTORISTS IN 
THE AREA SHOULD SLOW DOWN AND PREPARE FOR WATER ACROSS ROADWAYS.

LOCATIONS IMPACTED INCLUDE...
KELSO CIMA AND KELBAKER 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 3516 11574 3518 11516 3505 11519 3489 11506
      3473 11565

$$

JS
347 
WGUS75 KVEF 140538
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
1038 PM PDT FRI JUL 13 2012

CAC071-140547-
/O.EXP.KVEF.FF.W.0017.000000T0000Z-120714T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
1038 PM PDT FRI JUL 13 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 1045 PM PDT FOR CENTRAL SAN
BERNARDINO COUNTY...

THUNDERSTORMS OVER EAST CENTRAL SAN BERNARDINO COUNTY HAVE 
DISSIPATED AND FLASH FLOODING IS NO LONGER EXPECTED. THE WARNING 
WILL BE ALLOWED TO EXPIRE AT 1045 PM.

LAT...LON 3516 11574 3518 11516 3505 11519 3489 11506
      3473 11565

$$

JS

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, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.