Alert archive / Arizona / Flash Flood Warnings in 2016

Flash Flood Warning 76, NWS Las Vegas, NV

August 4, 2016Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Aug 4, 2016, 1:31 AM MST for Mohave County, Arizona. It was in force for 119 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 4, 2016, 1:31 AM MST (08:31 UTC)
Expired
Aug 4, 2016, 3:30 AM MST
In force
119 min
Issued by
NWS Las Vegas, NV
Area
Storm-based polygon
Flood severity
None

County Mohave County, AZ

The radar

The Las Vegas radar (KESX), 73 km from the middle of the area, began a volume at 08:30 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, 8.5 hours before the alert went out and 167 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 2016-08-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1079 joules per kilogram.LCLEL10008507005003002001001 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 2016-08-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -36 square meters per square second.1939Sfc1 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
1079 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
2895 m above ground
0-6 km bulk shear
3 kt
0-1 km storm-relative helicity
-36 m²/s²
0-3 km storm-relative helicity
22 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

543 
WGUS55 KVEF 040831
FFWVEF
AZC015-041030-
/O.NEW.KVEF.FF.W.0076.160804T0831Z-160804T1030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
131 AM MST THU AUG 4 2016

THE NATIONAL WEATHER SERVICE IN LAS VEGAS  HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHWESTERN MOHAVE COUNTY IN NORTHWESTERN ARIZONA...

* UNTIL 330 AM MST

* AT 129 AM MST...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING
  HEAVY RAIN IN THE OATMAN AREA AND RURAL AREA FARTHER NORTH AND
  WEST.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  OATMAN. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.

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 3502 11464 3504 11463 3507 11460 3509 11462
      3510 11464 3511 11464 3512 11462 3512 11459
      3513 11458 3517 11457 3523 11442 3498 11433

$$

MORGAN
2 follow-up statements
092 
WGUS75 KVEF 040934
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
234 AM MST THU AUG 4 2016

AZC015-041030-
/O.CON.KVEF.FF.W.0076.000000T0000Z-160804T1030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
234 AM MST THU AUG 4 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 330 AM MST FOR
SOUTHWESTERN MOHAVE COUNTY...

AT 233 AM MST...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING
HEAVY RAIN IN THE OATMAN AREA. TWO GAGES IN THE AREA WERE ALSO
REPORTING HEAVY RAIN TOTALS OF OVER AN INCH PER HOUR.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
OATMAN. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.

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 3502 11464 3504 11463 3507 11460 3512 11438
      3498 11433

$$

MORGAN
279 
WGUS75 KVEF 041024
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
324 AM MST THU AUG 4 2016

AZC015-041032-
/O.EXP.KVEF.FF.W.0076.000000T0000Z-160804T1030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
324 AM MST THU AUG 4 2016

...THE FLASH FLOOD WARNING FOR SOUTHWESTERN MOHAVE COUNTY WILL EXPIRE
AT 330 AM MST...

MOST OF THE HEAVY RAIN HAS ENDED IN THE OATMAN AREA, AND MAINLY
LIGHT RAIN WAS STILL FALLING. VERY HEAVY RAIN FELL EARLIER NEAR
OATMAN AND ON BOUNDARY CONE ROAD, SO PLEASE CONTINUE TO HEED ANY
REMAINING ROAD CLOSURES.

LAT...LON 3502 11464 3504 11463 3507 11460 3512 11438
      3498 11433

$$

MORGAN

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 3, 7:52 PM MSTFlash Flood WarningVEFMohave3 hr
Aug 3, 9:13 PM MSTSevere Thunderstorm WarningVEFMohave62 min
Aug 3, 10:21 PM MSTAreal Flood AdvisoryVEFMohave3 hr
Aug 3, 10:58 PM MSTSevere Thunderstorm WarningVEFMohave32 min
Aug 4, 12:07 AM MSTFlash Flood WarningVEFMohave113 min
Aug 4, 12:09 AM MSTFlash Flood WarningVEFMohave2 hr
Aug 4, 12:34 AM MSTFlash Flood WarningVEFMohave116 min
Aug 4, 1:47 AM MSTAreal Flood WarningVEFMohave12 hr

Nearby

Flash Flood Warnings in Arizona, 2016Every flash flood warning in 2016

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.