Alert archive / California / Flash Flood Warnings in 2011

Flash Flood Warning 61, NWS Las Vegas, NV

July 29, 2011Inyo County, California

NWS Las Vegas, NV issued this flash flood warning at Jul 29, 2011, 8:53 PM PDT for Inyo County, California. It was in force for 82 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 29, 2011, 8:53 PM PDT (03:53 UTC)
Expired
Jul 29, 2011, 10:15 PM PDT
In force
82 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), 135 km from the middle of the area, began a volume at 03:56 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, 3.9 hours before the alert went out and 236 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 2011-07-30Temperature 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, Las Vegas, NV at 00:00Z on 2011-07-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -2 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
4070 m above ground
0-6 km bulk shear
6 kt
0-1 km storm-relative helicity
-2 m²/s²
0-3 km storm-relative helicity
16 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.

408 
WGUS55 KVEF 300353
FFWVEF
CAC027-300515-
/O.NEW.KVEF.FF.W.0061.110730T0353Z-110730T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
853 PM PDT FRI JUL 29 2011

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 1015 PM PDT.

* AT 840 PM PDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED RUNOFF
  FROM EARLIER THUNDERSTORMS HAS MOVED DOWNWASH IN THE WHITNEY
  PORTAL AREA AND IS CROSSING HIGHWAY 395. PORTIONS OF THE WHITNEY 
  PORTAL ROADWAY HAVE BEEN WASHED OUT WITH FLOODING BEING REPORTED IN
  THE LONE PINE AREA.

* LOCATIONS IMPACTED INCLUDE...LONE PINE...PORTAGEE LAKE
  CAMPGROUND   AND WHITNEY PORTAL CAMPGROUND. IN ADDITION...PORTIONS
  OF HIGHWAY 395 IN THE LONE PINE MAY BE IMPACTED.

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 TWITTER #NWSVEGAS.

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

&&

LAT...LON 3661 11824 3660 11804 3657 11805 3657 11818
      3657 11823

$$

JENSEN
2 follow-up statements
491 
WGUS75 KVEF 300430
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
930 PM PDT FRI JUL 29 2011

CAC027-300515-
/O.CON.KVEF.FF.W.0061.000000T0000Z-110730T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
INYO CA-
930 PM PDT FRI JUL 29 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1015 PM PDT FOR WEST
CENTRAL INYO COUNTY...

AT 915 PM PDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED THAT HEAVY 
RAIN FROM EARLIER THUNDERSTORMS WAS PRODUCING FLASH FLOODING ALONG 
WHITNEY PORTAL ROAD AND PORTIONS OF THAT ROADWAY WERE WASHED OUT. 
DEBRIS REPORTED EARLIER ON HIGHWAY 395 NEAR LONE PINE HAS BEEN 
CLEARED AND THE HIGHWAY IS OPEN. 

LOCATIONS IMPACTED INCLUDE...WHITNEY PORTAL ROAD WEST OF LONE 
PINE...PORTAGEE LAKE CAMPGROUND AND WHITNEY PORTAL CAMPGROUND.

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!

CAMPERS AND HIKERS SHOULD BE ALERT TO THE POSSIBILITY OF RAPIDLY 
RISING WATER AND BE PREPARED TO MOVE QUICKLY TO HIGHER GROUND IF 
FLASH FLOODING IS OBSERVED.

REPORT FLOODING BY POSTING YOUR REPORT TO THE LAS VEGAS NATIONAL
WEATHER SERVICE FACEBOOK PAGE OR TWITTER #NWSVEGAS.

&&

LAT...LON 3661 11824 3660 11804 3657 11805 3657 11818
      3657 11823

$$

JS
629 
WGUS75 KVEF 300516
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
1016 PM PDT FRI JUL 29 2011

CAC027-300517-
/O.EXP.KVEF.FF.W.0061.000000T0000Z-110730T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
INYO CA-
1016 PM PDT FRI JUL 29 2011

...THE FLASH FLOOD WARNING WILL EXPIRE AT 1015 PM PDT FOR WEST
CENTRAL INYO COUNTY...

RADAR INDICATES LIGHT RAIN FALLING ALONG THE EASTERN SIERRA SLOPES 
WEST OF LONE PINE. ACCORDING TO THE HIGHWAY PATROL...WHITNEY PORTAL 
ROAD IS CLOSED 3 MILES WEST OF HIGHWAY 395 DUE TO FLOODING.
 
LAT...LON 3661 11824 3660 11804 3657 11805 3657 11818
      3657 11823

$$

JS

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 29, 6:07 PM PDTFlash Flood WarningVEFInyo53 min
Jul 29, 6:55 PM PDTAreal Flood AdvisoryVEFSan Bernardino80 min
Jul 29, 7:02 PM PDTFlash Flood WarningVEFInyo118 min
Jul 29, 8:21 PM PDTAreal Flood AdvisoryVEFSan Bernardino84 min
Jul 30, 12:57 PM PDTFlash Flood WarningVEFInyo2 hr
Jul 30, 1:52 PM PDTAreal Flood AdvisoryVEFSan Bernardino32 min
Jul 30, 2:07 PM PDTFlash Flood WarningVEFInyo3 hr
Jul 30, 2:17 PM PDTSevere Thunderstorm WarningVEFSan Bernardino43 min
Jul 30, 2:20 PM PDTFlash Flood WarningVEFSan Bernardino115 min
Jul 30, 4:07 PM PDTAreal Flood AdvisoryVEFInyo113 min
Jul 30, 4:35 PM PDTFlash Flood WarningVEFSan Bernardino115 min

Nearby

Flash Flood Warnings in California, 2011Every flash flood warning in 2011

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.