Alert archive / California / Flash Flood Warnings in 2012

Flash Flood Warning 21, NWS Las Vegas, NV

July 14, 2012San Bernardino County, California

NWS Las Vegas, NV issued this flash flood warning at Jul 14, 2012, 1:19 PM PDT for San Bernardino County, California. It was in force for 3 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 14, 2012, 1:19 PM PDT (20:19 UTC)
Expired
Jul 14, 2012, 1:22 PM PDT
In force
3 min
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), 164 km from the middle of the area, began a volume at 20:19 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

San Diego, CA (KNKX), launched 12:00Z, 8.3 hours before the alert went out and 190 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 12:00Z 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 12:00Z on 2012-07-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 50 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
1159 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
50 m²/s²
0-3 km storm-relative helicity
61 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.

553 
WGUS55 KVEF 142019
FFWVEF
CAC071-142215-
/O.NEW.KVEF.FF.W.0021.120714T2019Z-120714T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 315 PM PDT.

* AT 115 PM PDT...TRAINED WEATHER SPOTTERS REPORTED VERY HEAVY RAIN  
  FROM A THUNDERSTORM NEAR TWENTYNINE PALMS WAS CAUSING STREET       
  FLOODING AND BEGINNING TO ENTER SOME HOMES. WATER WAS ESTIMATED TO 
  BE A FOOT DEEP ON LOCAL STREETS. THE STORM PRODUCING VERY          
  HEAVY RAIN WAS NEARLY STATIONARY. FLOODING AND DEBRIS WASHING ONTO 
  ADDITIONAL AREA ROADS INCLUDING HIGHWAY 62 IS LIKELY.

* LOCATIONS IMPACTED INCLUDE...
  TWENTYNINE PALMS MCAS AND JOSHUA TREE LAKE 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 3408 11600 3412 11606 3412 11626 3408 11627
      3408 11641 3430 11638 3424 11542 3409 11541
      3412 11553 3407 11555 3409 11561 3404 11560
      3403 11600

$$

STACHELSKI
1 follow-up statement
316 
WGUS75 KVEF 142022
FFSVEF

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

CAC071-142031-
/O.CAN.KVEF.FF.W.0021.000000T0000Z-120714T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
122 PM PDT SAT JUL 14 2012

...THE FLASH FLOOD WARNING HAS BEEN UPGRADED TO A FLASH FLOOD 
WARNING FOR SOUTH CENTRAL SAN BERNARDINO COUNTY...

THE FLOOD ADVISORY IN EFFECT FOR THE MORONGO BASIN HAS BEEN UPGRADED 
TO A FLASH FLOOD WARNING. PLEASE REFER TO THAT WARNING FOR MORE 
DETAILS. 

LAT...LON 3408 11600 3412 11606 3412 11626 3408 11627
      3408 11641 3430 11638 3424 11542 3409 11541
      3412 11553 3407 11555 3409 11561 3404 11560
      3403 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, 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, 1:34 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.