Alert archive / Arizona / Flash Flood Warnings in 2011

Flash Flood Warning 76, NWS Las Vegas, NV

August 27, 2011Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Aug 27, 2011, 5:49 PM MST for Mohave County, Arizona. It was in force for 116 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
Aug 27, 2011, 5:49 PM MST (00:49 UTC)
Expired
Aug 27, 2011, 7:45 PM MST
In force
116 min
Issued by
NWS Las Vegas, NV
Area
Storm-based polygon
Flood severity
None

County Mohave County, AZ

The radar

The Las Vegas radar (KESX), 123 km from the middle of the area, began a volume at 00:50 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

Flgstf/Belemont, AZ (KFGZ), launched 00:00Z, 0.8 hours before the alert went out and 175 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, Flgstf/Belemont, AZ at 00:00Z on 2011-08-28Temperature 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 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Flgstf/Belemont, AZ at 00:00Z on 2011-08-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -24 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
3394 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
-24 m²/s²
0-3 km storm-relative helicity
2 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.

571 
WGUS55 KVEF 280049
FFWVEF
AZC015-280245-
/O.NEW.KVEF.FF.W.0076.110828T0049Z-110828T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
549 PM MST SAT AUG 27 2011

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL MOHAVE COUNTY IN NORTHWEST ARIZONA...

* UNTIL 745 PM MST.

* AT 548 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM 6 MILES SOUTHEAST OF BLAKE
  RANCH RV PARK...OR 20 MILES EAST OF KINGMAN. THE STORM PRODUCING
  VERY HEAVY RAIN WAS NEARLY STATIONARY.

* LOCATIONS IMPACTED INCLUDE...
  BLAKE RANCH RV PARK.

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 TWITTER #NWSVEGAS.

&&

LAT...LON 3522 11378 3518 11360 3499 11365 3503 11382

$$

PIERCE
2 follow-up statements
739 
WGUS75 KVEF 280148
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
648 PM MST SAT AUG 27 2011

AZC015-280245-
/O.CON.KVEF.FF.W.0076.000000T0000Z-110828T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
648 PM MST SAT AUG 27 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 745 PM MST FOR
CENTRAL MOHAVE COUNTY...

AT 639 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THE 
THUNDERSTORM PRODUCING VERY HEAVY RAIN HAS WEAKENED. HOWEVER...RADAR 
ESTIMATES BETWEEN AROUND 2 INCHES OF RAIN FELL IS SEVERAL SMALL 
BASIN SOUTH OF INTERSTATE 40 AND WEST OF HIGHWAY 93. FLASH FLOODING 
OF NORMALLY DRY WASHES WILL CONTINUE THROUGH 745 PM MST. 

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 TWITTER #NWSVEGAS.

&&

LAT...LON 3522 11378 3518 11360 3499 11365 3503 11382

$$

PIERCE
457 
WGUS75 KVEF 280236
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
736 PM MST SAT AUG 27 2011

AZC015-280246-
/O.EXP.KVEF.FF.W.0076.000000T0000Z-110828T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
736 PM MST SAT AUG 27 2011

...THE FLASH FLOOD WARNING WILL EXPIRE AT 745 PM MST FOR CENTRAL
MOHAVE COUNTY...

THUNDERSTORMS OVER THE WARNED AREA WEAKENED. THE FLASH FLOOD WARNING 
WILL BE ALLOWED TO EXPIRE AT 745 PM MST.

LAT...LON 3522 11378 3518 11360 3499 11365 3503 11382

$$

PIERCE

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 27, 5:23 PM MSTSevere Thunderstorm WarningVEFMohave52 min
Aug 27, 6:18 PM MSTFlash Flood WarningVEFMohave96 min
Aug 27, 7:43 PM MSTSevere Thunderstorm WarningVEFMohave47 min
Aug 27, 8:25 PM MSTAreal Flood AdvisoryVEFMohave3 hr
Aug 28, 3:39 AM MSTExcessive Heat WarningVEFMohave40 hr

Nearby

Flash Flood Warnings in Arizona, 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.