Alert archive / California / Flash Flood Warnings in 2012

Flash Flood Warning 19, NWS Las Vegas, NV

July 13, 2012San Bernardino County, California

NWS Las Vegas, NV issued this flash flood warning at Jul 13, 2012, 11:46 PM PDT for San Bernardino County, California. It was in force for 97 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, 11:46 PM PDT (06:46 UTC)
Expired
Jul 14, 2012, 1:23 AM PDT
In force
97 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), 84 km from the middle of the area, began a volume at 06:48 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, 6.8 hours before the alert went out and 172 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.

483 
WGUS55 KVEF 140646
FFWVEF
CAC071-140845-
/O.NEW.KVEF.FF.W.0019.120714T0646Z-120714T0845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
1146 PM PDT FRI JUL 13 2012

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 145 AM PDT.

* AT 1138 PM PDT...THE CALIFORNIA HIGHWAY PATROL REPORTED RUNOFF     
  FROM EARLIER STORMS CROSSING HIGHWAY 95 CREATING FLASH FLOODING    
  FROM THE SACRAMENTO WASH SOUTH TO GOFFS ROAD. THE RUNOFF WILL      
  REACH THE FAR SOUTHERN PORTIONS OF HIGHWAY 95 BY 1 AM.

* LOCATIONS IMPACTED INCLUDE...
  HIGHWAY 95 NORTH OF INTERSTATE 40.

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.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS EVEN HARDER TO SEE WATER
COVERING THE ROADWAY OR IN LOW WATER CROSSINGS.

&&

LAT...LON 3492 11484 3505 11485 3506 11481 3497 11481
      3489 11474 3488 11477 3492 11479

$$

JS
2 follow-up statements
492 
WGUS75 KVEF 140753
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
1253 AM PDT SAT JUL 14 2012

CAC071-140845-
/O.CON.KVEF.FF.W.0019.000000T0000Z-120714T0845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
1253 AM PDT SAT JUL 14 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 145 AM PDT FOR EAST
CENTRAL SAN BERNARDINO COUNTY...

AT 1244 AM PDT...CALIFORNIA HIGHWAY PATROL OFFICIALS CONTINUED TO 
REPORT WATER FLOWING OVER HIGHWAY 95 IN THE SACRAMENTO WASH AREA 
NORTH OF INTERSTATE 40. MOTORISTS SHOULD BE PREPARED FOR DELAYS AND 
USE CAUTION WHILE TRAVELING IN THIS AREA THROUGH 2 AM.

LOCATIONS IMPACTED INCLUDE...
HIGHWAY 95 AT THE SACRAMENTO WASH.

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.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS EVEN HARDER TO SEE WATER
COVERING THE ROADWAY OR IN LOW WATER CROSSINGS.

&&

LAT...LON 3492 11484 3505 11485 3506 11481 3497 11481
      3489 11474 3488 11477 3492 11479

$$

JS
693 
WGUS75 KVEF 140823
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
123 AM PDT SAT JUL 14 2012

CAC071-140827-
/O.CAN.KVEF.FF.W.0019.000000T0000Z-120714T0845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
123 AM PDT SAT JUL 14 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR EAST CENTRAL SAN
BERNARDINO COUNTY...

CALIFORNIA HIGHWAY PATROL REPORTS INDICATE THAT WATER LEVELS ARE 
RECEDING OVER HIGHWAY 95 AND THIS IS EXPECTED TO CONTINUE.  

LAT...LON 3492 11484 3505 11485 3506 11481 3497 11481
      3489 11474 3488 11477 3492 11479

$$

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, 8:50 PM PDTFlash Flood WarningVEFSan Bernardino115 min
Jul 13, 9:39 PM PDTFlash Flood WarningVEFSan Bernardino81 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.