Alert archive / Arizona / Flash Flood Warnings in 2011

Flash Flood Warning 40, NWS Las Vegas, NV

July 8, 2011Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Jul 8, 2011, 11:27 AM MST for Mohave County, Arizona. 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
Jul 8, 2011, 11:27 AM MST (18:27 UTC)
Expired
Jul 8, 2011, 1:30 PM MST
In force
2 hr
Issued by
NWS Las Vegas, NV
Area
Storm-based polygon
Flood severity
None

County Mohave County, AZ

The radar

The Cedar City radar (KICX), 81 km from the middle of the area, began a volume at 18:29 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 12:00Z, 6.5 hours before the alert went out and 203 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 12:00Z on 2011-07-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 423 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Flgstf/Belemont, AZ at 12:00Z on 2011-07-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 14 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
423 J/kg
Mixed-layer CIN
-59 J/kg
Mixed-layer LCL
1308 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
14 m²/s²
0-3 km storm-relative helicity
77 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.

527 
WGUS55 KVEF 081827
FFWVEF
AZC015-082030-
/O.NEW.KVEF.FF.W.0040.110708T1827Z-110708T2030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
1127 AM MST FRI JUL 8 2011

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 130 PM MST.

* AT 1118 AM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
VERY HEAVY RAIN FROM THUNDERSTORMS ABOUT 6 MILES SOUTHWEST OF PIPE   
SPRING NATIONAL MONUMENT...OR 15 MILES SOUTHEAST OF COLORADO CITY.   
THESE STORMS ARE PRODUCING RAINFALL RATES OF UP TO 3 INCHES AN HOUR. 
THEY ARE MOVING NORTH NORTHEAST AT ABOUT 20 TO 25  MILES PER HOUR.

* LOCATIONS IMPACTED INCLUDE...PIPE SPRING...PIPE SPRING NATIONAL
  MONUMENT AND KAIBAB.

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 3698 11287 3699 11256 3665 11268 3671 11305

$$

JJ
1 follow-up statement
726 
WGUS75 KVEF 081942
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
1242 PM MST FRI JUL 8 2011

AZC015-082030-
/O.CON.KVEF.FF.W.0040.000000T0000Z-110708T2030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
1242 PM MST FRI JUL 8 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 130 PM MST FOR
NORTHEASTERN MOHAVE COUNTY...

AT 1236 PM MST...THE THUNDERSTORMS THAT WERE PRODUCING VERY HEAVY 
RAIN HAVE MOVED NORTH OUT OF THE AREA. RUNOFF FROM THE THUNDERSTORMS 
IS EXPECTED TO CONTINUE TO KEEP WASHES AND OTHER LOW LYING AREAS 
FULL OF DEEP RUNNING WATER THROUGH 130 PM.   

LOCATIONS IMPACTED INCLUDE...PIPE SPRING...PIPE SPRING NATIONAL
MONUMENT AND KAIBAB.

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 3698 11287 3699 11256 3665 11268 3671 11305

$$

JJ

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 8, 10:55 AM MSTAreal Flood AdvisoryVEFMohave78 min
Jul 8, 11:34 AM MSTSevere Thunderstorm WarningVEFMohave41 min
Jul 8, 12:52 PM MSTFlash Flood WarningVEFMohave113 min
Jul 8, 2:25 PM MSTSevere Thunderstorm WarningVEFMohave50 min
Jul 8, 3:35 PM MSTFlash Flood WarningVEFMohave66 min
Jul 8, 3:36 PM MSTAreal Flood AdvisoryVEFMohave3 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.