Alert archive / Arizona / Flash Flood Warnings in 2017

Flash Flood Warning 96, NWS Las Vegas, NV

August 24, 2017Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Aug 24, 2017, 6:58 AM MST for Mohave County, Arizona. It was in force for 3 hr. 2 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 24, 2017, 6:58 AM MST (13:58 UTC)
Expired: Aug 24, 2017, 10:00 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), 71 km from the middle of the area, began a volume at 14:00 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 24, 7:45 AM MST	FLASH FLOOD	15 Nne Dolan Springs, AZ	MOHAVE COUNTY REPORTED THAT PIERCE FERRY ROAD WAS CLOSED DUE TO FLASH FLOODING AT ARCHIBALD WASH. WEBCAM ALSO SHOWS SIGNIFICANT FLOODING.
Aug 24, 9:00 AM MST	FLASH FLOOD	6 Wsw Temple Bar, AZ	LAKE MEAD DISPATCH REPORTS DEBRIS AND WATER FLOWING ACROSS TEMPLE BAR RD. ROAD IS CLOSED TO TRAFFIC.

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, 2.0 hours before the alert went out and 128 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: 119 J/kg
Mixed-layer CIN: -213 J/kg
Mixed-layer LCL: 2787 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: 5 m²/s²
0-3 km storm-relative helicity: -13 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

477 
WGUS55 KVEF 241358
FFWVEF
AZC015-241700-
/O.NEW.KVEF.FF.W.0096.170824T1358Z-170824T1700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Las Vegas NV
658 AM MST THU AUG 24 2017

The National Weather Service in Las Vegas has issued a

* Flash Flood Warning for...
  West central Mohave County in northwestern Arizona...

* Until 1000 AM MST

* At 657 AM MST, a trained weather spotters reported thunderstorms 
  producing heavy rain near Meadview. Nearly an inch and half of 
  rain has already fallen. Flash flooding is expected to begin 
  shortly.

* Some locations that will experience flooding include...
  Grand Canyon Ranch, Grand Canyon Skywalk, Temple Bar Campground, 
  Pierce Ferry And Antares Roads, South Cove, Meadview, Dolan 
  Springs and Temple Bar.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3566 11392 3562 11442 3588 11460 3609 11457
      3614 11437 3608 11431 3606 11432 3601 11422
      3603 11415 3609 11411 3611 11412 3612 11410
      3622 11404 3619 11370

$$

BP

3 follow-up statements

453 
WGUS75 KVEF 241501
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
801 AM MST THU AUG 24 2017

AZC015-241700-
/O.CON.KVEF.FF.W.0096.000000T0000Z-170824T1700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-
801 AM MST THU AUG 24 2017

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1000 AM MST FOR
WEST CENTRAL MOHAVE COUNTY...

At 759 AM MST, Doppler radar indicated that rain had tapered off in 
the Meadview area, but more thunderstorms producing heavy rain were 
moving in. A camera showed that Archibald Wash had flooded Pierce 
Ferry Road, and additional heavy rain will worsen the situation.

Some locations that will experience flooding include...
Grand Canyon Ranch, Lake Mead National Recreation Area, Grand Canyon
Skywalk, Temple Bar Campground, Pierce Ferry And Antares Roads, South
Cove, Meadview, Dolan Springs and Temple Bar.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3566 11392 3562 11442 3588 11460 3609 11457
      3614 11437 3608 11431 3606 11432 3601 11422
      3603 11415 3609 11411 3611 11412 3612 11410
      3622 11404 3619 11370

$$

Morgan

932 
WGUS75 KVEF 241541
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
841 AM MST THU AUG 24 2017

AZC015-241700-
/O.CON.KVEF.FF.W.0096.000000T0000Z-170824T1700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-
841 AM MST THU AUG 24 2017

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1000 AM MST FOR
WEST CENTRAL MOHAVE COUNTY...

At 840 AM MST, Doppler radar indicated that rain was tapering off in 
the Meadview area, where the heaviest rain had fallen. However, 
heavy rain was also falling in the Dolan Springs area and along 
Temple Bar Road, and flash flooding may occur in these areas.

Some locations that will experience flooding include...
Grand Canyon Ranch, Lake Mead National Recreation Area, Grand Canyon
Skywalk, Temple Bar Campground, Pierce Ferry And Antares Roads, South
Cove, Meadview, Dolan Springs and Temple Bar.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3566 11392 3562 11442 3588 11460 3609 11457
      3614 11437 3608 11431 3606 11432 3601 11422
      3603 11415 3609 11411 3611 11412 3612 11410
      3622 11404 3619 11370

$$

Morgan

916 
WGUS75 KVEF 241655
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
955 AM MST THU AUG 24 2017

AZC015-241704-
/O.EXP.KVEF.FF.W.0096.000000T0000Z-170824T1700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-
955 AM MST THU AUG 24 2017

...THE FLASH FLOOD WARNING FOR WEST CENTRAL MOHAVE COUNTY WILL EXPIRE
AT 1000 AM MST...

This warning has been replaced by another warning valid until 1215 
PM MST for the Temple Bar and Willow Beach areas. In addition, 
Archibald Wash has overflowed and closed Pierce Ferry Road. Please 
continue to heed any remaining road closures.

LAT...LON 3566 11392 3562 11442 3588 11460 3609 11457
      3614 11437 3608 11431 3606 11432 3601 11422
      3603 11415 3609 11411 3611 11412 3612 11410
      3622 11404 3619 11370

$$

Morgan

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 23, 5:24 PM MST	Areal Flood Advisory	VEF	Mohave	3 hr
Aug 24, 6:33 AM MST	Areal Flood Advisory	VEF	Mohave	3 hr
Aug 24, 9:51 AM MST	Flash Flood Warning	VEF	Mohave	2 hr

Nearby

Flash Flood Warnings in Arizona, 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.