Alert archive / Arizona / Flash Flood Warnings in 2020

Flash Flood Warning 13, NWS Las Vegas, NV

July 24, 2020Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Jul 24, 2020, 4:06 PM MST for Mohave County, Arizona. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 24, 2020, 4:06 PM MST (23:06 UTC)
Expired: Jul 24, 2020, 7:00 PM MST
In force: 3 hr
Issued by: NWS Las Vegas, NV
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

County Mohave County, AZ

The radar

The Las Vegas radar (KESX), 134 km from the middle of the area, began a volume at 23:08 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

Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 11.1 hours before the alert went out and 151 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: 75 J/kg
Mixed-layer CIN: -65 J/kg
Mixed-layer LCL: 1214 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: 72 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

740 
WGUS55 KVEF 242306
FFWVEF
AZC015-250200-
/O.NEW.KVEF.FF.W.0013.200724T2306Z-200725T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Las Vegas NV
406 PM PDT Fri Jul 24 2020

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 406 PM MST, Doppler radar indicated slow moving thunderstorms 
  producing heavy rain over Route 66 between mile markers 80 and 100 
  and over Hackberry Road between Route 66 and Interstate 40. Flash 
  flooding is ongoing or expected to begin shortly.

  HAZARD...Life threatening flash flooding. Thunderstorms
           producing flash flooding.

  SOURCE...Doppler radar.

  IMPACT...Life threatening flash flooding normally dry washes
           that intersect Hackberry Road and portions of Route
           66.

* Some locations that will experience flash flooding include...
  Valentine and Peach Springs.

This includes the following highways...
Route 66 in Arizona between mile markers 80 and 100 and Hackberry 
Road between Interstate 40 and Route 66.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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 3547 11334 3525 11350 3514 11365 3553 11379
      3568 11334 3560 11334 3557 11334 3548 11334

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

Boothe

3 follow-up statements

316 
WGUS75 KVEF 250000
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
500 PM PDT Fri Jul 24 2020

AZC015-250200-
/O.CON.KVEF.FF.W.0013.000000T0000Z-200725T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-
500 PM MST Fri Jul 24 2020

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 7 PM MST THIS EVENING 
FOR CENTRAL MOHAVE COUNTY...

At 458 PM MST, Doppler radar indicated thunderstorms with heavy rain 
continuing over eastern Mohave County. The heaviest rain was falling 
on Hackberry Road between Interstate 40 and Highway 66.

HAZARD...Life threatening flash flooding. Thunderstorms producing
         flash flooding.

SOURCE...Doppler radar.

IMPACT...Life threatening flash flooding of creeks, streams, and
         roads.

Some locations that will experience flash flooding include...
  Valentine and Peach Springs.

This includes the following highways...
	Interstate 40 in Arizona between mile markers 75 and 76.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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 3547 11334 3525 11350 3514 11365 3553 11379
      3568 11334 3560 11334 3557 11334 3548 11334

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

CM

873 
WGUS75 KVEF 250056
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
556 PM PDT Fri Jul 24 2020

AZC015-250200-
/O.CON.KVEF.FF.W.0013.000000T0000Z-200725T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-
556 PM MST Fri Jul 24 2020

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 7 PM MST THIS EVENING 
FOR CENTRAL MOHAVE COUNTY...

At 556 PM MST, Doppler radar indicated that most rain had ended in 
the area. However, Hackberry Wash is likely running due to earlier 
heavy rain, and may be affecting Hackberry Road.

HAZARD...Life threatening flash flooding. Thunderstorms producing
         flash flooding.

SOURCE...Doppler radar.

IMPACT...Life threatening flash flooding of creeks, streams, and
         roads.

Some locations that will experience flash flooding include...
  Hackberry Road.

This includes the following highways...
	Interstate 40 in Arizona between mile markers 75 and 76.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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 3547 11334 3525 11350 3514 11365 3553 11379
      3568 11334 3560 11334 3557 11334 3548 11334

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

CM

997 
WGUS75 KVEF 250151
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
651 PM PDT Fri Jul 24 2020

AZC015-250201-
/O.EXP.KVEF.FF.W.0013.000000T0000Z-200725T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-
651 PM MST Fri Jul 24 2020

...FLASH FLOOD WARNING WILL EXPIRE AT 7 PM MST THIS EVENING FOR 
CENTRAL MOHAVE COUNTY...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

LAT...LON 3547 11334 3525 11350 3514 11365 3553 11379
      3568 11334 3560 11334 3557 11334 3548 11334

$$

CM

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 9:07 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Jul 24, 1:20 AM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Jul 24, 10:56 AM MST	Tornado Warning Tornado observed	VEF	Mohave	34 min
Jul 24, 11:00 AM MST	Areal Flood Advisory	VEF	Mohave	52 min
Jul 24, 11:43 AM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	4 hr
Jul 24, 12:44 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	86 min
Jul 24, 1:16 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Jul 24, 1:30 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr

Nearby

Flash Flood Warnings in Arizona, 2020 Every flash flood warning in 2020

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.