Alert archive / Arizona / Flash Flood Warnings in 2014

Flash Flood Warning 71, NWS Las Vegas, NV

August 3, 2014Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Aug 3, 2014, 9:19 PM MST for Mohave County, Arizona. It was in force for 3 hr. 3 reports 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: Aug 3, 2014, 9:19 PM MST (04:19 UTC)
Expired: Aug 4, 2014, 12:15 AM MST
In force: 3 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), 47 km from the middle of the area, began a volume at 04:18 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
Aug 3, 9:50 PM MST	FLASH FLOOD	1 Se Willow Beach, AZ	NATIONAL PARKS SERVICE REPORTS WATER AND DEBRIS OVER WILLOW BEACH ROAD. TIME ESTIMATED FROM RADAR.
Aug 3, 10:00 PM MST	FLASH FLOOD	8 W Temple Bar, AZ	THE TEMPLE BAR ROAD WAS IMPASSIBLE DUE TO FLOODWATERS CROSSING THE ROAD AT DETRITAL WASH.
Aug 3, 10:15 PM MST	FLASH FLOOD	2 Se Hoover Dam, AZ	NATIONAL PARKS SERVICE REPORTS KINGMAN WASH ROAD HAS BEEN WASHED OUT. TIME ESTIMATED FROM RADAR

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 00:00Z, 4.3 hours before the alert went out and 104 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: 1 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1593 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 2 m²/s²
0-3 km storm-relative helicity: 33 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.

449 
WGUS55 KVEF 040419
FFWVEF
AZC015-040715-
/O.NEW.KVEF.FF.W.0071.140804T0419Z-140804T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
919 PM MST SUN AUG 3 2014

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 1215 AM MST/1215 AM PDT/

* AT 915 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM THUNDERSTORMS ALONG A LINE EXTENDING FROM
  TEMPLE BAR CAMPGROUND TO 11 MILES SOUTH OF HOOVER DAM...OR ALONG A
  LINE EXTENDING FROM 33 MILES EAST OF BOULDER CITY TO 12 MILES
  SOUTHEAST OF BOULDER CITY. THE STORMS PRODUCING FLASH FLOODING WERE
  MOVING SLOWLY NORTH.

* LOCATIONS IMPACTED INCLUDE...
  WILLOW BEACH AND TEMPLE BAR.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLASH FLOODING IS EXPECTED IN WASHES...LOW WATER CROSSINGS AND ON
ROADS. TO ESCAPE RISING WATER...MOVE TO HIGHER GROUND. NEVER TRY TO
CROSS A FLOODED ROAD OR ENTER A FLOOD CHANNEL. TURN AROUND...DONT
DROWN!

REPORT FLOODING TO THE LAS VEGAS NATIONAL WEATHER SERVICE VIA
FACEBOOK OR TWITTER.

&&

LAT...LON 3578 11400 3572 11470 3585 11471 3587 11466
      3594 11474 3602 11475 3603 11472 3609 11476
      3615 11457 3615 11451 3613 11450 3614 11438
      3602 11426 3603 11417

$$

JH

2 follow-up statements

830 
WGUS75 KVEF 040520
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
1020 PM MST SUN AUG 3 2014

AZC015-040715-
/O.CON.KVEF.FF.W.0071.000000T0000Z-140804T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
1020 PM MST SUN AUG 3 2014

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1215 AM MST/1215 AM
PDT/ FOR WEST CENTRAL MOHAVE COUNTY...

AT 1012 PM MST/1012 PM PDT/...NATIONAL WEATHER SERVICE DOPPLER RADAR
CONTINUED TO INDICATE THUNDERSTORMS PRODUCING FLASH FLOODING OVER THE
WARNED AREA ALTHOUGH THEY WERE WEAKENING AND BEGINNING TO MOVE 
NORTH. OVER AN OF RAIN FELL ALONG TEMPLE BAR ROAD WITH THREE 
QUARTERS OF AN INCH NEAR WILLOW BEACH. THIS RAIN FELL IN A VERY 
SHORT AMOUNT OF TIME. 

LOCATIONS IMPACTED INCLUDE...
WILLOW BEACH...TEMPLE BAR AND TEMPLE BAR ROAD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLASH FLOODING IS EXPECTED IN WASHES...LOW WATER CROSSINGS AND ON
ROADS. TO ESCAPE RISING WATER...MOVE TO HIGHER GROUND. NEVER TRY TO
CROSS A FLOODED ROAD OR ENTER A FLOOD CHANNEL. TURN AROUND...DONT
DROWN!

REPORT FLOODING TO THE LAS VEGAS NATIONAL WEATHER SERVICE VIA
FACEBOOK OR TWITTER.

&&

LAT...LON 3578 11400 3572 11470 3585 11471 3587 11466
      3594 11474 3602 11475 3603 11472 3609 11476
      3615 11457 3615 11451 3613 11450 3614 11438
      3602 11426 3603 11417

$$

JH

309 
WGUS75 KVEF 040707
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
1207 AM MST MON AUG 4 2014

AZC015-040715-
/O.EXP.KVEF.FF.W.0071.000000T0000Z-140804T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
1207 AM MST MON AUG 4 2014

...THE FLASH FLOOD WARNING WILL EXPIRE AT 1215 AM MST/1215 AM PDT/
FOR WEST CENTRAL MOHAVE COUNTY...

RAINFALL HAS MOSTLY ENDED IN THE AREA FROM WILLOW TO TEMPLE BAR AND 
THERE IS NO THREAT OF ADDITIONAL FLOODING AT THIS TIME. 

LAT...LON 3578 11400 3572 11470 3585 11471 3587 11466
      3594 11474 3602 11475 3603 11472 3609 11476
      3615 11457 3615 11451 3613 11450 3614 11438
      3602 11426 3603 11417

$$

JH

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 3, 5:07 PM MST	Severe Thunderstorm Warning	VEF	Mohave	53 min
Aug 3, 5:14 PM MST	Severe Thunderstorm Warning	VEF	Mohave	46 min
Aug 3, 5:41 PM MST	Severe Thunderstorm Warning	VEF	Mohave	49 min
Aug 3, 6:34 PM MST	Areal Flood Warning	VEF	Mohave	12 hr
Aug 3, 7:24 PM MST	Flash Flood Warning	VEF	Mohave	3 hr
Aug 4, 4:58 PM MST	Areal Flood Advisory	VEF	Mohave	3 hr

Nearby

Flash Flood Warnings in Arizona, 2014 Every flash flood warning in 2014

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.