Alert archive / California / Flash Flood Warnings in 2012

Flash Flood Warning 207, NWS Las Vegas, NV

September 11, 2012Inyo County, California

NWS Las Vegas, NV issued this flash flood warning at Sep 11, 2012, 4:02 PM PDT for Inyo County, California. It was in force for 57 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, 4:02 PM PDT (23:02 UTC)
Expired
Sep 11, 2012, 4:59 PM PDT
In force
57 min
Issued by
NWS Las Vegas, NV
Area
Storm-based polygon
Flood severity
None

County Inyo County, CA

The radar

The San Joaquin Valley radar (KHNX), 179 km from the middle of the area, began a volume at 23:04 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 12:00Z, 11.0 hours before the alert went out and 242 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 12:00Z on 2012-09-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Las Vegas, NV at 12:00Z on 2012-09-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 17 square meters per square second.1939Sfc1 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
2 J/kg
Mixed-layer CIN
-171 J/kg
Mixed-layer LCL
1725 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
17 m²/s²
0-3 km storm-relative helicity
37 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.

294 
WGUS55 KVEF 112302
FFWVEF
CAC027-120100-
/O.NEW.KVEF.FF.W.0207.120911T2302Z-120912T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN INYO COUNTY IN EASTERN CALIFORNIA...

* UNTIL 600 PM PDT.

* AT 354 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM NEAR ANCIENT BRISTLECONE VC...
  OR 13 MILES EAST OF BISHOP. THE STORM PRODUCING VERY HEAVY RAIN WAS
  NEARLY STATIONARY.

* LOCATIONS IMPACTED INCLUDE...
  ANCIENT BRISTLECONE VC. AND ROUTE 168.

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 3709 11815 3745 11833 3746 11785 3728 11759

$$

JH
2 follow-up statements
956 
WGUS75 KVEF 112357
FFSVEF

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

CAC027-120007-
/O.CAN.KVEF.FF.W.0207.000000T0000Z-120912T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
INYO CA-
457 PM PDT TUE SEP 11 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR NORTHWESTERN INYO
COUNTY...

NO RAIN HAS FALLEN IN THE AREA AROUND WESTGARD PASS IN A WHILE AND 
THE THREAT OF FLASH FLOODING HAS ENDED.

LAT...LON 3709 11815 3745 11833 3746 11785 3728 11759

$$

JH
169 
WGUS75 KVEF 112359 CCA
FFSVEF

FLASH FLOOD STATEMENT...CORRECTION
NATIONAL WEATHER SERVICE LAS VEGAS NV
459 PM PDT TUE SEP 11 2012

CAC027-120007-
/O.CAN.KVEF.FF.W.0207.000000T0000Z-120912T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
INYO CA-
459 PM PDT TUE SEP 11 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR NORTHEASTERN INYO
COUNTY...

NO RAIN HAS FALLEN IN THE AREA AROUND WESTGARD PASS IN A WHILE AND 
THE THREAT OF FLASH FLOODING HAS ENDED.

LAT...LON 3709 11815 3745 11833 3746 11785 3728 11759

$$

JH

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 10, 6:00 PM PDTFlash Flood WarningVEFSan Bernardino2 hr
Sep 11, 1:20 PM PDTFlash Flood WarningVEFInyo3 hr
Sep 11, 2:03 PM PDTFlash Flood WarningVEFInyo117 min
Sep 11, 3:57 PM PDTFlash Flood WarningVEFSan Bernardino2 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.