Alert archive / Arizona / Flash Flood Warnings in 2018

Flash Flood Warning 69, NWS Las Vegas, NV

July 18, 2018Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Jul 18, 2018, 4:01 PM MST for Mohave County, Arizona. It was in force for 3 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: Jul 18, 2018, 4:01 PM MST (23:01 UTC)
Expired: Jul 18, 2018, 7:00 PM 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), 111 km from the middle of the area, began a volume at 23:03 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
Jul 18, 4:42 PM MST	FLASH FLOOD	6 N Hualapai Peak, AZ	DW RANCH ROAD CLOSED DUE TO FLOODING BETWEEN MILE MARKERS 1 AND 5.

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

The nearest sounding before it

Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 11.0 hours before the alert went out and 187 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: 144 J/kg
Mixed-layer CIN: -99 J/kg
Mixed-layer LCL: 1444 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 1 m²/s²
0-3 km storm-relative helicity: 53 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

904 
WGUS55 KVEF 182301
FFWVEF
AZC015-190200-
/O.NEW.KVEF.FF.W.0069.180718T2301Z-180719T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Las Vegas NV
401 PM MST WED JUL 18 2018

The National Weather Service in Las Vegas has issued a

* Flash Flood Warning for...
  Central Mohave County in northwestern Arizona...

* Until 700 PM MST.

* At 400 PM MST, Doppler radar indicated thunderstorms producing 
  heavy rain across over the Hualapai Mountains. Flash flooding is 
  expected to begin shortly and my impact DW Ranch Road and Hualapai 
  Mountain Park.  Three-quarters of an inch of rain has fallen in 
  the past 15 minutes near DW Ranch Road. 

* Some locations that will experience flooding include...
  Kingman, Dw Ranch Road, Wild Cow Campground, Blake Ranch Road,
  Hualapai Mountain Park and Hualapai Peak.

This includes Interstate 40 in Arizona between mile markers 56 and
78.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

&&

LAT...LON 3499 11365 3503 11408 3512 11406 3522 11397
      3529 11398 3539 11391 3527 11354

$$

Outler

3 follow-up statements

748 
WGUS75 KVEF 182346
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
446 PM MST WED JUL 18 2018

AZC015-190200-
/O.CON.KVEF.FF.W.0069.000000T0000Z-180719T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-
446 PM MST WED JUL 18 2018

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 700 PM MST FOR
CENTRAL MOHAVE COUNTY...

At 444 PM MST, radar continued to indicate heavy rain due to a 
thunderstorms just east of Kingman.  Flash flooding is ongoing and 
law enforcement reported DW Ranch Road was closed due to flooding 
and water flowing over the roadway. 

Some locations that will experience flooding include...
East Kingman, Dw Ranch Road, Wild Cow Campground, Blake Ranch Road, 
Hualapai Mountain Park and Hualapai Peak.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

&&

LAT...LON 3499 11365 3503 11408 3512 11406 3522 11397
      3529 11398 3539 11391 3527 11354

$$

Outler

653 
WGUS75 KVEF 190040
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
540 PM MST WED JUL 18 2018

AZC015-190200-
/O.CON.KVEF.FF.W.0069.000000T0000Z-180719T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-
540 PM MST WED JUL 18 2018

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 700 PM MST FOR
CENTRAL MOHAVE COUNTY...

At 539 PM MST, Doppler radar and automated rain gauges indicated 
thunderstorms producing heavy rain near DW Ranch Road. A rain gauge 
near the Petro Center reported over 1 inch of rain in the last 
hour. Flash flooding is ongoing.

Some locations that will experience flooding include...
Kingman, Dw Ranch Road, Wild Cow Campground, Blake Ranch Road,
Hualapai Mountain Park and Hualapai Peak.

This includes Interstate 40 in Arizona between mile markers 56 and
78.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

&&

LAT...LON 3499 11365 3503 11408 3512 11406 3522 11397
      3529 11398 3539 11391 3527 11354

$$

Outler

448 
WGUS75 KVEF 190152
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
652 PM MST WED JUL 18 2018

AZC015-190201-
/O.EXP.KVEF.FF.W.0069.000000T0000Z-180719T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-
652 PM MST WED JUL 18 2018

...THE FLASH FLOOD WARNING FOR CENTRAL MOHAVE COUNTY WILL EXPIRE AT
700 PM MST...

The heavy rain has ended over the Hualapai 
Mountains...however...runoff from earlier rainfall will linger 
through the evening. Please continue to heed any remaining road 
closures.

LAT...LON 3499 11365 3503 11408 3512 11406 3522 11397
      3529 11398 3539 11391 3527 11354

$$

Outler

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 17, 5:22 PM MST	Flash Flood Warning	VEF	Mohave	3 hr
Jul 17, 5:33 PM MST	Areal Flood Advisory	VEF	Mohave	3 hr
Jul 17, 6:32 PM MST	Flash Flood Warning	VEF	Mohave	3 hr
Jul 17, 7:14 PM MST	Areal Flood Advisory	VEF	Mohave	3 hr
Jul 18, 12:31 AM MST	Severe Thunderstorm Warning	VEF	Mohave	59 min

Nearby

Flash Flood Warnings in Arizona, 2018 Every flash flood warning in 2018

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.