Alert archive / Nevada / Flash Flood Warnings in 2011

Flash Flood Warning 99, NWS Las Vegas, NV

September 15, 2011Lincoln County, Nevada

NWS Las Vegas, NV issued this flash flood warning at Sep 15, 2011, 7:41 PM PDT for Lincoln County, Nevada. It was in force for 2 hr. 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 15, 2011, 7:41 PM PDT (02:41 UTC)
Expired
Sep 15, 2011, 9:45 PM PDT
In force
2 hr
Issued by
NWS Las Vegas, NV
Area
Storm-based polygon
Flood severity
None

County Lincoln County, NV

The radar

The Cedar City radar (KICX), 164 km from the middle of the area, began a volume at 02:43 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, 2.7 hours before the alert went out and 174 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 2011-09-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 88 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 2011-09-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 21 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
88 J/kg
Mixed-layer CIN
-109 J/kg
Mixed-layer LCL
2334 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
21 m²/s²
0-3 km storm-relative helicity
95 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.

650 
WGUS55 KVEF 160241
FFWVEF
NVC017-160445-
/O.NEW.KVEF.FF.W.0099.110916T0241Z-110916T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
741 PM PDT THU SEP 15 2011

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL LINCOLN COUNTY IN SOUTH CENTRAL NEVADA...

* UNTIL 945 PM PDT.

* AT 732 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM OVER CENTRAL LINCOLN COUNTY...
  OR 18 MILES SOUTHWEST OF PIOCHE. THE STORM PRODUCING VERY HEAVY
  RAIN WAS NEARLY STATIONARY.

* LOCATIONS IMPACTED INCLUDE...THIS STORM IS EXPECTED TO MAINLY 
IMPACT AREAS IN THE DRY LAKE VALLEY SOUTHWEST OF PIOCHE. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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.

&&

LAT...LON 3774 11456 3767 11481 3788 11492 3794 11467

$$

ASG
2 follow-up statements
698 
WGUS75 KVEF 160349
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
849 PM PDT THU SEP 15 2011

NVC017-160445-
/O.CON.KVEF.FF.W.0099.000000T0000Z-110916T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LINCOLN NV-
849 PM PDT THU SEP 15 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 945 PM PDT FOR
CENTRAL LINCOLN COUNTY...

AT 842 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A MODERATE TO HEAVY RAIN. THIS STORM WAS LOCATED OVER 
CENTRAL LINCOLN COUNTY...OR 18 MILES SOUTHWEST OF PIOCHE. THE 
THUNDERSTORM WITH EXCESSIVE RAIN WAS NEARLY STATIONARY. THIS STORM 
HAS WEAKENED IN INTENSITY...BUT HIGH RUNOFF WILL STILL CONTINUE 
THROUGH 1000 PM. 

LOCATIONS IMPACTED INCLUDE...THIS STORM IS EXPECTED TO MAINLY IMPACT 
AREAS IN THE DRY LAKE VALLEY SOUTHWEST OF PIOCHE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

&&

LAT...LON 3774 11456 3767 11481 3788 11492 3794 11467

$$

ASG
166 
WGUS75 KVEF 160437
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
937 PM PDT THU SEP 15 2011

NVC017-160446-
/O.EXP.KVEF.FF.W.0099.000000T0000Z-110916T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LINCOLN NV-
937 PM PDT THU SEP 15 2011

...THE FLASH FLOOD WARNING WILL EXPIRE AT 945 PM PDT FOR CENTRAL
LINCOLN COUNTY...

HEAVY RAIN FROM EARLIER THUNDERSTORMS HAS MOVED EAST AND WEAKENED 
AND THE THREAT OF FLASH FLOODING HAS ENDED. 

LAT...LON 3774 11456 3767 11481 3788 11492 3794 11467

$$

ASG

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 15, 5:14 PM PDTFlash Flood WarningVEFLincoln2 hr
Sep 15, 5:46 PM PDTFlash Flood WarningVEFLincoln119 min
Sep 16, 12:47 PM PDTSevere Thunderstorm WarningVEFClark43 min
Sep 16, 1:29 PM PDTSevere Thunderstorm WarningVEFClark46 min
Sep 16, 1:58 PM PDTFlash Flood WarningVEFClark71 min
Sep 16, 2:03 PM PDTFlash Flood WarningVEFLincoln2 hr

Nearby

Flash Flood Warnings in Nevada, 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.