Alert archive / California / Flash Flood Warnings in 2012

Flash Flood Warning 211, NWS Las Vegas, NV

September 11, 2012Inyo County, California

NWS Las Vegas, NV issued this flash flood warning at Sep 11, 2012, 7:54 PM PDT for Inyo County, California. It was in force for 71 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
Sep 11, 2012, 7:54 PM PDT (02:54 UTC)
Expired
Sep 11, 2012, 9:05 PM PDT
In force
71 min
Issued by
NWS Las Vegas, NV
Area
Storm-based polygon
Flood severity
None

County Inyo County, CA

The nearest sounding before it

Las Vegas, NV (KVEF), launched 00:00Z, 2.9 hours before the alert went out and 167 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 2012-09-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 352 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 2012-09-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -59 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
352 J/kg
Mixed-layer CIN
-73 J/kg
Mixed-layer LCL
827 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
-59 m²/s²
0-3 km storm-relative helicity
0 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.

560 
WGUS55 KVEF 120254
FFWVEF
CAC027-120445-
/O.NEW.KVEF.FF.W.0211.120912T0254Z-120912T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
754 PM PDT TUE SEP 11 2012

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTH CENTRAL INYO COUNTY IN EASTERN CALIFORNIA...

* UNTIL 945 PM PDT.

* AT 749 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM OVER SOUTH CENTRAL INYO
  COUNTY...OR 32 MILES SOUTH OF STOVEPIPE WELLS. THE STORM PRODUCING
  VERY HEAVY RAIN WAS NEARLY STATIONARY.

* LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF SOUTHERN INYO COUNTY.
  TRONA WILDROSE ROAD.

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.

&&

LAT...LON 3605 11753 3608 11738 3618 11735 3618 11720
      3608 11720 3594 11730 3594 11737

$$

WOLCOTT
1 follow-up statement
106 
WGUS75 KVEF 120405
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
905 PM PDT TUE SEP 11 2012

CAC027-120412-
/O.CAN.KVEF.FF.W.0211.000000T0000Z-120912T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
INYO CA-
905 PM PDT TUE SEP 11 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR SOUTH CENTRAL INYO
COUNTY...

THUNDERSTORMS PRODUCING HEAVY RAIN HAVE LARGELY DISSIPATED NEAR 
TRONA WILDROSE ROAD...AND FLASH FLOODING IS NO LONGER CONSIDERED A 
THREAT. THEREFORE...THE FLASH FLOOD WARNING HAS BEEN CANCELLED.

LAT...LON 3605 11753 3608 11738 3618 11735 3618 11720
      3608 11720 3594 11730 3594 11737

$$

KENNEDY

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 11, 5:25 PM PDTSevere Thunderstorm WarningVEFSan Bernardino35 min
Sep 11, 5:43 PM PDTFlash Flood WarningVEFSan Bernardino2 hr
Sep 11, 5:54 PM PDTSevere Thunderstorm WarningVEFSan Bernardino19 min
Sep 11, 6:41 PM PDTFlash Flood WarningVEFInyo2 hr
Sep 11, 8:36 PM PDTSevere Thunderstorm WarningVEFSan Bernardino39 min
Sep 11, 9:59 PM PDTSevere Thunderstorm WarningVEFSan Bernardino76 min
Sep 11, 11:02 PM PDTFlash Flood WarningVEFSan Bernardino118 min

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.