Alert archive / Arizona / Flash Flood Warnings in 2016

Flash Flood Warning 71, NWS Las Vegas, NV

August 4, 2016Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Aug 4, 2016, 12:07 AM MST for Mohave County, Arizona. It was in force for 113 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 4, 2016, 12:07 AM MST (07:07 UTC)
Expired: Aug 4, 2016, 2:00 AM MST
In force: 113 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), 28 km from the middle of the area, began a volume at 07:07 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 00:00Z, 7.1 hours before the alert went out and 102 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: 1079 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 2895 m above ground
0-6 km bulk shear: 3 kt
0-1 km storm-relative helicity: -36 m²/s²
0-3 km storm-relative helicity: 22 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

551 
WGUS55 KVEF 040707
FFWVEF
AZC015-040900-
/O.NEW.KVEF.FF.W.0071.160804T0707Z-160804T0900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
1207 AM MST THU AUG 4 2016

THE NATIONAL WEATHER SERVICE IN LAS VEGAS  HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WESTERN MOHAVE COUNTY IN NORTHWESTERN ARIZONA...

* UNTIL 200 AM MST

* AT 1207 AM MST...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING
  HEAVY RAIN IN THE WILLOW BEACH AREA. FLASH FLOODING IS EXPECTED TO
  BEGIN SHORTLY.

* FLASH FLOODING WILL REMAIN OVER MAINLY RURAL AREAS OF WESTERN
  MOHAVE COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.

IN HILLY TERRAIN THERE ARE HUNDREDS OF LOW WATER CROSSINGS WHICH ARE
POTENTIALLY DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO CROSS FLOODED
ROADS. FIND AN ALTERNATE ROUTE.

&&

LAT...LON 3579 11453 3570 11470 3577 11470 3580 11469
      3585 11471 3587 11466 3595 11462 3597 11445

$$

MORGAN

2 follow-up statements

609 
WGUS75 KVEF 040755
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
1255 AM MST THU AUG 4 2016

AZC015-040900-
/O.CON.KVEF.FF.W.0071.000000T0000Z-160804T0900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
1255 AM MST THU AUG 4 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 200 AM MST FOR
WESTERN MOHAVE COUNTY...

AT 1253 AM MST...DOPPLER RADAR INDICATED ONLY LIGHT RAIN REMAINING
IN THE WILLOW BEACH AREA. EARLIER THUNDERSTORMS PRODUCED OVER HALF
AN INCH OF RAIN IN HALF AN HOUR, SO FLOODING MAY BE ONGOING.

FLASH FLOODING WILL REMAIN OVER MAINLY RURAL AREAS OF WESTERN MOHAVE
COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.

IN HILLY TERRAIN THERE ARE HUNDREDS OF LOW WATER CROSSINGS WHICH ARE
POTENTIALLY DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO CROSS FLOODED
ROADS. FIND AN ALTERNATE ROUTE.

&&

LAT...LON 3579 11453 3570 11470 3577 11470 3580 11469
      3585 11471 3587 11466 3595 11462 3597 11445

$$

MORGAN

530 
WGUS75 KVEF 040850
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
150 AM MST THU AUG 4 2016

AZC015-040900-
/O.EXP.KVEF.FF.W.0071.000000T0000Z-160804T0900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
150 AM MST THU AUG 4 2016

...THE FLASH FLOOD WARNING FOR WESTERN MOHAVE COUNTY WILL EXPIRE AT
200 AM MST...

THE HEAVY RAIN HAS ENDED IN THE WILLOW BEACH AREA. FLOODING IS NO
LONGER EXPECTED TO POSE A THREAT. PLEASE CONTINUE TO HEED ANY
REMAINING ROAD CLOSURES.

LAT...LON 3579 11453 3570 11470 3577 11470 3580 11469
      3585 11471 3587 11466 3595 11462 3597 11445

$$

MORGAN

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 3, 7:52 PM MST	Flash Flood Warning	VEF	Mohave	3 hr
Aug 3, 9:13 PM MST	Severe Thunderstorm Warning	VEF	Mohave	62 min
Aug 3, 10:21 PM MST	Areal Flood Advisory	VEF	Mohave	3 hr
Aug 3, 10:58 PM MST	Severe Thunderstorm Warning	VEF	Mohave	32 min
Aug 4, 12:09 AM MST	Flash Flood Warning	VEF	Mohave	2 hr
Aug 4, 12:34 AM MST	Flash Flood Warning	VEF	Mohave	116 min
Aug 4, 1:31 AM MST	Flash Flood Warning	VEF	Mohave	119 min
Aug 4, 1:47 AM MST	Areal Flood Warning	VEF	Mohave	12 hr

Nearby

Flash Flood Warnings in Arizona, 2016 Every flash flood warning in 2016

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.