Alert archive / Arizona / Flash Flood Warnings in 2017

Flash Flood Warning 35, NWS Las Vegas, NV

July 24, 2017Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Jul 24, 2017, 7:30 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, 2017, 7:30 PM MST (02:30 UTC)
Expired
Jul 24, 2017, 10:30 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), 78 km from the middle of the area, began a volume at 02:32 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, 2.5 hours before the alert went out and 172 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-pSkew-T log-p diagram, Las Vegas, NV at 00:00Z on 2017-07-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 183 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Las Vegas, NV at 00:00Z on 2017-07-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 18 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
183 J/kg
Mixed-layer CIN
-90 J/kg
Mixed-layer LCL
2329 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
18 m²/s²
0-3 km storm-relative helicity
51 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

714 
WGUS55 KVEF 250230
FFWVEF
AZC015-250530-
/O.NEW.KVEF.FF.W.0035.170725T0230Z-170725T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Las Vegas NV
730 PM MST MON JUL 24 2017

The National Weather Service in Las Vegas has issued a

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

* Until 1030 PM MST

* At 728 PM MST, Doppler radar and automated rain gauges indicated 
  thunderstorms producing heavy rain in Golden Valley. Flash 
  flooding is expected to begin shortly.

* Some locations that will experience flooding include...
  Golden Valley and Chloride. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Warning means that flooding is imminent or occurring.
If you are in the warned area move to higher ground immediately.
Residents living along streams and creeks should take immediate 
precautions to protect life and property.

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

&&

LAT...LON 3549 11425 3535 11414 3530 11426 3499 11399
      3488 11410 3539 11450

$$

JS
2 follow-up statements
525 
WGUS75 KVEF 250402
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
902 PM MST MON JUL 24 2017

AZC015-250530-
/O.CON.KVEF.FF.W.0035.000000T0000Z-170725T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-
902 PM MST MON JUL 24 2017

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1030 PM MST FOR
WEST CENTRAL MOHAVE COUNTY...

At 854 PM MST, Doppler radar indicates heavy rain has ended in the 
warned area. However...the warning continues as 1 to 2 inches of 
rain that fell earlier has caused elevated water levels in washes 
and standing water in other low lying areas. Motorists should use 
caution.

Some locations that will continue to be impacted include...
Golden Valley. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Please report flooding to your local law enforcement agency when you
can do so safely.

&&

LAT...LON 3549 11425 3535 11414 3530 11426 3499 11399
      3488 11410 3539 11450

$$

JS
555 
WGUS75 KVEF 250528
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
1028 PM MST MON JUL 24 2017

AZC015-250537-
/O.EXP.KVEF.FF.W.0035.000000T0000Z-170725T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-
1028 PM MST MON JUL 24 2017

...THE FLASH FLOOD WARNING FOR WEST CENTRAL MOHAVE COUNTY WILL EXPIRE
AT 1030 PM MST...

The heavy rain has ended in the Golden Valley area. Flooding is no 
longer expected to pose a threat. Please continue to heed any 
remaining road closures.

LAT...LON 3549 11425 3535 11414 3530 11426 3499 11399
      3488 11410 3539 11450

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 24, 6:14 PM MSTFlash Flood WarningVEFMohave3 hr
Jul 24, 8:40 PM MSTFlash Flood WarningVEFMohave3 hr
Jul 24, 9:34 PM MSTFlash Flood WarningVEFMohave3 hr
Jul 24, 11:59 PM MSTFlash Flood WatchVEFMohave20 hr
Jul 25, 5:42 AM MSTFlash Flood WarningVEFMohave10 hr
Jul 25, 8:06 AM MSTFlash Flood WarningVEFMohave8 hr
Jul 25, 11:06 AM MSTFlash Flood WarningVEFMohave6 hr
Jul 25, 4:21 PM MSTAreal Flood WarningVEFMohave12 hr

Nearby

Flash Flood Warnings in Arizona, 2017Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.