Alert archive / Arizona / Flash Flood Warnings in 2011

Flash Flood Warning 84, NWS Las Vegas, NV

September 13, 2011Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Sep 13, 2011, 5:10 AM MST for Mohave County, Arizona. It was in force for 2 hr. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Sep 13, 2011, 5:10 AM MST (12:10 UTC)
Expired: Sep 13, 2011, 7:15 AM 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 Las Vegas radar (KESX), 99 km from the middle of the area, began a volume at 12:11 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.

What was reported inside it

Time	Report	Where	Remark
Sep 13, 5:40 AM MST	FLASH FLOOD	4 Nnw Topock, AZ	0.90 INCH OF RAIN IN AN HOUR OR LESS. MUD SLID OVER SOME ROADS. THE EVENT TIME IS ESTIMATED.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Las Vegas, NV (KVEF), launched 12:00Z, 0.2 hours before the alert went out and 193 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: 239 J/kg
Mixed-layer CIN: -98 J/kg
Mixed-layer LCL: 1707 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 75 m²/s²
0-3 km storm-relative helicity: 136 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

824 
WGUS55 KVEF 131210
FFWVEF
AZC015-131415-
/O.NEW.KVEF.FF.W.0084.110913T1210Z-110913T1415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
510 AM MST TUE SEP 13 2011

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 715 AM MST.

* AT 502 AM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM OVER EXTREME SOUTHWESTERN
  MOHAVE COUNTY...OR 7 MILES NORTHWEST OF TOPOCK...MOVING            
  NORTHEAST AT 5 MPH.

* THIS FLASH FLOOD WARNING REPLACES THE FLOOD
  ADVISORY THAT WAS ISSUED FOR THIS SAME GENERAL AREA AT 433 AM      
  MST.  

* LOCATIONS IMPACTED INCLUDE...GOLDEN SHORES PLUS
  MAINLY RURAL AREAS OF SOUTHWESTERN MOHAVE 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 3499 11458 3497 11442 3486 11422 3472 11448
      3476 11453 3481 11457

$$

PIERCE

2 follow-up statements

461 
WGUS75 KVEF 131313
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
613 AM MST TUE SEP 13 2011

AZC015-131415-
/O.CON.KVEF.FF.W.0084.000000T0000Z-110913T1415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
613 AM MST TUE SEP 13 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 715 AM MST/715 AM
PDT/ FOR SOUTHWESTERN MOHAVE COUNTY...

AT 610 AM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A THUNDERSTORM PRODUCING VERY HEAVY RAIN NORTHWEST OF 
GOLDEN SHORES. THIS STORM WAS LOCATED OVER EXTREME SOUTHWESTERN 
MOHAVE COUNTY...OR 13 MILES NORTH OF TOPOCK...MOVING NORTHEAST AT 20 
MPH.

AN AUTOMATED MOHAVE COUNTY FLOOD CONTROL DISTRICT STATION NEAR 
GOLDEN SHORES REPORTED EIGHT TENTHS OF AN INCH FROM THE EARLIER 
THUNDERSTORM.

LOCATIONS IMPACTED INCLUDE...GOLDEN SHORES...ARIZONA HIGHWAY 95 PLUS 
MAINLY RURAL AREAS OF SOUTHWESTERN MOHAVE 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 3499 11458 3497 11442 3486 11422 3472 11448
      3476 11453 3481 11457

$$

PIERCE

614 
WGUS75 KVEF 131413
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
713 AM MST TUE SEP 13 2011

AZC015-131420-
/O.EXP.KVEF.FF.W.0084.000000T0000Z-110913T1415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
713 AM MST TUE SEP 13 2011

...THE FLASH FLOOD WARNING WILL EXPIRE AT 715 AM MST FOR 
SOUTHWESTERN MOHAVE COUNTY...

ISOLATED THUNDERSTORMS WILL CONTINUE ACROSS SOUTHWESTERN MOHAVE 
COUNTY THROUGH MID MORNING. THERE WILL BE A CHANCE FOR  ADDITIONAL 
HEAVY RAIN AT TIMES. 

A FLASH FLOOD WATCH IS IN EFFECT UNTIL MIDNIGHT THIS EVENING. 

LAT...LON 3499 11458 3497 11442 3486 11422 3472 11448
      3476 11453 3481 11457

$$

PIERCE

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 13, 3:36 AM MST	Flash Flood Watch	VEF	Mohave	15 hr
Sep 13, 4:33 AM MST	Areal Flood Advisory	VEF	Mohave	41 min
Sep 13, 5:32 AM MST	Areal Flood Advisory	VEF	Mohave	118 min
Sep 13, 5:46 AM MST	Areal Flood Advisory	VEF	Mohave	119 min
Sep 13, 8:23 AM MST	Flash Flood Warning	VEF	Mohave	112 min
Sep 13, 9:56 AM MST	Flash Flood Warning	VEF	Mohave	83 min
Sep 13, 11:09 AM MST	Flash Flood Warning	VEF	Mohave	27 min

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.