Alert archive / Arizona / Flash Flood Warnings in 2017

Flash Flood Warning 41, NWS Las Vegas, NV

July 25, 2017Mohave County, Arizona; Lincoln County, Nevada

NWS Las Vegas, NV issued this flash flood warning at Jul 25, 2017, 5:42 AM MST for Mohave County, Arizona; Lincoln County, Nevada. It was in force for 10 hr. 5 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: Jul 25, 2017, 5:42 AM MST (12:42 UTC)
Expired: Jul 25, 2017, 3:45 PM MST
In force: 10 hr
Issued by: NWS Las Vegas, NV
Area: Storm-based polygon
Flood severity: None

Counties Mohave County, AZ, Lincoln County, NV

The radar

The Las Vegas radar (KESX), 83 km from the middle of the area, began a volume at 12:45 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 25, 8:00 AM MST	FLASH FLOOD	2 E Willow Beach, AZ	WILLOW BEACH ROAD IS CLOSED DUE TO FLASH FLOODING THAT OCCURRED EARLIER THIS MORNING. ROAD DAMAGE IS SO EXTENSIVE IT IS EXPECTED TO TAKE DAYS TO FIX.
Jul 25, 9:11 AM MST	FLASH FLOOD	8 Ene Willow Beach, AZ	FLASH FLOOD HAS CLOSED TEMPLE BAR ROAD. THERE IS A VEHICLE TRAPPED BETWEEN TWO FLOODED SEGMENTS. WATER IS RUNNING TO RAPIDLY TO CROSS.
Jul 25, 9:11 AM MST	FLASH FLOOD	9 Ene Willow Beach, AZ	FLASH FLOOD HAS CLOSED TEMPLE BAR ROAD. THERE IS A VEHICLE TRAPPED BETWEEN TWO FLOODED SEGMENTS. WATER IS RUNNING TO RAPIDLY TO CROSS.
Jul 25, 11:19 AM MST	FLASH FLOOD	5 Ene South Cove, AZ	EMERGENCY MANAGEMENT REPORTS SEARCH AND RESCUE HAS BEEN DISPATCH TO RESCUE A TOUR BUS STUCK IN WASH/FLOOD WATERS. NO OTHER DETAILS AVAILABLE AT THE MOMENT.
Jul 25, 11:21 AM MST	FLASH FLOOD	9 Sw Meadview, AZ	EMERGENCY MANAGER REPORTS CARS STUCK BEHIND FLASH FLOODS THAT ARE OVER TOPPING GREG'S HIDEOUT RD.

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, 0.7 hours before the alert went out and 119 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: 916 J/kg
Mixed-layer CIN: -51 J/kg
Mixed-layer LCL: 897 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 149 m²/s²
0-3 km storm-relative helicity: 167 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 3.2

Open this sounding in Storm Lab

The text

As transmitted.

566 
WGUS55 KVEF 251242
FFWVEF
AZC015-NVC017-251645-
/O.NEW.KVEF.FF.W.0041.170725T1242Z-170725T1645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Las Vegas NV
542 AM PDT TUE JUL 25 2017

The National Weather Service in Las Vegas has issued a

* Flash Flood Warning for...
  Northwestern Mohave County in northwestern Arizona...
  Southeastern Lincoln County in south central Nevada...

* Until 945 AM PDT/945 AM MST/

* At 542 AM PDT/542 AM MST/, Doppler radar indicated thunderstorms 
  producing heavy rain across northwest portions of Mohave County. 
  Flash flooding is expected to begin shortly.

* Some locations that will experience flooding include...
  Virgin River Gorge, Beaver Dam, Littlefield, Grand Canyon Skywalk,
  Pierce Ferry And Antares Roads, Meadview, Hoover Dam, Virgin River
  Campground, Grand Canyon Ranch, Lake Mead National Recreation Area,
  Temple Bar Campground, South Cove and Temple Bar.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3598 11371 3569 11416 3561 11466 3580 11471
      3587 11466 3594 11473 3609 11475 3614 11463
      3614 11437 3606 11432 3601 11422 3603 11415
      3620 11405 3684 11405 3684 11422 3704 11406
      3700 11405 3700 11313

$$

ASG

3 follow-up statements

616 
WGUS55 KVEF 251617
FFWVEF
AZC015-NVC017-251945-
/O.EXT.KVEF.FF.W.0041.000000T0000Z-170725T1945Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Las Vegas NV
917 AM PDT TUE JUL 25 2017

The National Weather Service in Las Vegas has extended the

* Flash Flood Warning for...
  Northwestern Mohave County in northwestern Arizona...
  Southeastern Lincoln County in south central Nevada...

* Until 1245 PM PDT/1245 PM MST/

* At 914 AM PDT/914 AM MST/, Doppler radar and automated rain gauges 
  indicated heavy rain falling across the warned area. Flash 
  flooding is occuring.

* Some locations that will experience flooding include...
  Virgin River Gorge, Beaver Dam, Littlefield, Grand Canyon Skywalk,
  Pierce Ferry And Antares Roads, Meadview, Hoover Dam, Virgin River
  Campground, Grand Canyon Ranch, Lake Mead National Recreation Area,
  Temple Bar Campground, South Cove and Temple Bar.

Flood waters are moving down Detrital Wash with significant impacts 
on Temple Bar Road.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, country roads, farmland, and other low lying
spots.

&&

LAT...LON 3598 11371 3569 11416 3561 11466 3580 11471
      3587 11466 3594 11473 3609 11475 3614 11463
      3614 11437 3606 11432 3601 11422 3603 11415
      3620 11405 3684 11405 3684 11422 3704 11406
      3700 11405 3700 11313

$$

STEELE

065 
WGUS55 KVEF 251857
FFWVEF
AZC015-NVC017-252245-
/O.EXT.KVEF.FF.W.0041.000000T0000Z-170725T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Las Vegas NV
1157 AM PDT TUE JUL 25 2017

The National Weather Service in Las Vegas has extended the

* Flash Flood Warning for...
  Northwestern Mohave County in northwestern Arizona...
  Southeastern Lincoln County in south central Nevada...

* Until 345 PM PDT/345 PM MST/

* At 1154 AM PDT/1154 AM MST/, Flash flooding continued across the 
  warned area. While the heaviest rain is now south of the warning, 
  runoff will continue to create flooding, with many roads that 
  serve access to the Colorado River/Lake Mead impassible. Travel is 
  not advised on unimproved/unpaved roads.

* Some locations that will experience flooding include...
  Virgin River Gorge, Beaver Dam, Littlefield, Grand Canyon Skywalk, 
  Pierce Ferry And Antares Roads, Diamond Bar Road, Buck and Doe 
  Road, Diamond Creek Road, Meadview, Virgin River Campground, Grand 
  Canyon Ranch, Lake Mead National Recreation Area, Temple Bar 
  Campground, South Cove and Temple Bar.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, country roads, farmland, and other low lying
spots.

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 3598 11371 3569 11416 3561 11466 3580 11471
      3587 11466 3594 11473 3609 11475 3614 11463
      3614 11437 3606 11432 3601 11422 3603 11415
      3620 11405 3684 11405 3684 11422 3704 11406
      3700 11405 3700 11313

$$

STEELE

818 
WGUS75 KVEF 252241
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
341 PM PDT TUE JUL 25 2017

AZC015-NVC017-252250-
/O.EXP.KVEF.FF.W.0041.000000T0000Z-170725T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-Lincoln NV-
341 PM PDT TUE JUL 25 2017

...THE FLASH FLOOD WARNING FOR NORTHWESTERN MOHAVE AND SOUTHEASTERN
LINCOLN COUNTIES WILL EXPIRE AT 345 PM PDT/345 PM MST/...

The heavy rain has ended. Flood waters have receded. Please continue 
to heed any remaining road closures. The area remains under a flash 
flood watch, and additional rainfall is possible. Be extremely 
cautious while traveling, as roads that have been flooded may be 
damaged.

LAT...LON 3598 11371 3569 11416 3561 11466 3580 11471
      3587 11466 3594 11473 3609 11475 3614 11463
      3614 11437 3606 11432 3601 11422 3603 11415
      3620 11405 3684 11405 3684 11422 3704 11406
      3700 11405 3700 11313

$$

STEELE

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 24, 6:14 PM MST	Flash Flood Warning	VEF	Mohave	3 hr
Jul 24, 7:30 PM MST	Flash Flood Warning	VEF	Mohave	3 hr
Jul 24, 8:40 PM MST	Flash Flood Warning	VEF	Mohave	3 hr
Jul 24, 9:34 PM MST	Flash Flood Warning	VEF	Mohave	3 hr
Jul 24, 11:59 PM MST	Flash Flood Watch	VEF	Mohave	20 hr
Jul 25, 8:06 AM MST	Flash Flood Warning	VEF	Mohave	8 hr
Jul 25, 11:06 AM MST	Flash Flood Warning	VEF	Mohave	6 hr
Jul 25, 4:21 PM MST	Areal Flood Warning	VEF	Mohave	12 hr
Jul 24, 5:39 PM MST	Areal Flood Advisory	VEF	Lincoln	3 hr
Jul 24, 7:13 PM MST	Flash Flood Warning	VEF	Lincoln	3 hr
Jul 25, 12:43 AM MST	Areal Flood Advisory	VEF	Lincoln	4 hr
Jul 25, 2:15 AM MST	Flash Flood Warning	VEF	Clark	3 hr
Jul 25, 4:54 AM MST	Flash Flood Warning	VEF	Clark	6 hr
Jul 25, 6:55 AM MST	Flash Flood Warning	VEF	Clark	5 hr
Jul 25, 10:28 AM MST	Areal Flood Advisory	VEF	Clark	3 hr
Jul 25, 10:47 AM MST	Areal Flood Advisory	VEF	Clark	6 hr
Jul 25, 1:57 PM MST	Areal Flood Advisory	VEF	Esmeralda	4 hr
Jul 25, 2:57 PM MST	Flash Flood Warning	VEF	Lincoln, Nye	3 hr
Jul 25, 4:23 PM MST	Flash Flood Warning	VEF	Lincoln, Nye	3 hr

Nearby

Flash Flood Warnings in Arizona, 2017 Flash Flood Warnings in Nevada, 2017 Every flash flood warning in 2017

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.