Alert archive / Arizona / Flash Flood Warnings in 2011

Flash Flood Warning 28, NWS Las Vegas, NV

July 6, 2011Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Jul 6, 2011, 1:39 PM MST for Mohave County, Arizona. It was in force for 39 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 6, 2011, 1:39 PM MST (20:39 UTC)
Expired: Jul 6, 2011, 2:18 PM MST
In force: 39 min
Issued by: NWS Las Vegas, NV
Area: Storm-based polygon
Flood severity: None

County Mohave County, AZ

The radar

The Cedar City radar (KICX), 112 km from the middle of the area, began a volume at 20:41 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, 8.7 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 213 J/kg
Mixed-layer CIN: -235 J/kg
Mixed-layer LCL: 1843 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: -13 m²/s²
0-3 km storm-relative helicity: -32 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.

967 
WGUS55 KVEF 062039
FFWVEF
AZC015-062245-
/O.NEW.KVEF.FF.W.0028.110706T2039Z-110706T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
139 PM MST WED JUL 6 2011

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 345 PM MST.

* AT 136 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM OVER NORTH CENTRAL MOHAVE
  COUNTY...OR 25 MILES SOUTH OF ST GEORGE. THE STORM PRODUCING VERY
  HEAVY RAIN WAS NEARLY STATIONARY.

* THE STORM PRODUCING VERY HEAVY RAIN WILL REMAIN OVER MAINLY RURAL
  AREAS OF THE INDICATED COUNTY.

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 3687 11384 3698 11350 3670 11342 3660 11364

$$

JJ

1 follow-up statement

995 
WGUS75 KVEF 062118
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
218 PM MST WED JUL 6 2011

AZC015-062127-
/O.CAN.KVEF.FF.W.0028.000000T0000Z-110706T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
218 PM MST WED JUL 6 2011

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR NORTH CENTRAL
MOHAVE COUNTY...

THE THUNDERSTORMS PRODUCING THE VERY HEAVY RAIN HAVE MOVED OUT OF 
THE AREA. THERE CAN STILL BE RUNNING WATER IN WASHES AND LOW LYING 
AREAS THROUGH 345 PM.

LAT...LON 3687 11384 3698 11350 3670 11342 3660 11364

$$

JJ

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 5, 6:18 PM MST	Flash Flood Warning	VEF	Mohave	50 min
Jul 5, 6:23 PM MST	Flash Flood Warning	VEF	Mohave	82 min
Jul 5, 11:19 PM MST	Areal Flood Advisory	VEF	Mohave	76 min
Jul 5, 11:49 PM MST	Flash Flood Warning	VEF	Mohave	116 min
Jul 6, 12:04 AM MST	Severe Thunderstorm Warning	VEF	Mohave	41 min
Jul 6, 12:15 AM MST	Flash Flood Warning	VEF	Mohave	2 hr
Jul 6, 4:40 AM MST	Flash Flood Watch	VEF	Mohave	17 hr

Nearby

Flash Flood Warnings in Arizona, 2011 Every 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.