Alert archive / Arizona / Flash Flood Warnings in 2012

Flash Flood Warning 87, NWS Las Vegas, NV

August 1, 2012Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Aug 1, 2012, 12:08 AM MST for Mohave County, Arizona. It was in force for 74 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 1, 2012, 12:08 AM MST (07:08 UTC)
Expired
Aug 1, 2012, 1:22 AM MST
In force
74 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), 65 km from the middle of the area, began a volume at 07:10 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, 7.1 hours before the alert went out and 145 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 2012-08-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 646 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 2012-08-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -12 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
646 J/kg
Mixed-layer CIN
-52 J/kg
Mixed-layer LCL
1370 m above ground
0-6 km bulk shear
8 kt
0-1 km storm-relative helicity
-12 m²/s²
0-3 km storm-relative helicity
16 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

533 
WGUS55 KVEF 010708
FFWVEF
AZC015-010900-
/O.NEW.KVEF.FF.W.0087.120801T0708Z-120801T0900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
1208 AM MST WED AUG 1 2012

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL MOHAVE COUNTY IN NORTHWEST ARIZONA...

* UNTIL 200 AM MST.

* AT 1157 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM 19 MILES SOUTH OF PIERCE FERRY
  AND ANTARES ROADS...OR 22 MILES NORTH OF KINGMAN. THE STORM 
  PRODUCING VERY HEAVY RAIN WAS MOVING NORTHWEST AROUND 20 MPH. 

* LOCATIONS IMPACTED INCLUDE...
  STOCKTON HILL ROAD BETWEEN MILE MARKER 22 AND COUNTY HIGHWAY 
  25...PIERCE FERRY AND ANTARES ROADS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS EVEN HARDER TO SEE WATER
COVERING THE ROADWAY OR IN LOW WATER CROSSINGS.

&&

LAT...LON 3575 11431 3585 11412 3557 11396 3549 11415

$$

ASG
2 follow-up statements
309 
WGUS75 KVEF 010747
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
1247 AM MST WED AUG 1 2012

AZC015-010900-
/O.CON.KVEF.FF.W.0087.000000T0000Z-120801T0900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
1247 AM MST WED AUG 1 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 200 AM MST FOR
CENTRAL MOHAVE COUNTY...

AT 1240 AM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE MODERATE TO HEAVY RAIN. THIS STORM WAS LOCATED NEAR PIERCE 
FERRY AND ANTARES ROADS...OR 37 MILES NORTH OF KINGMAN...MOVING 
NORTH AT 20 MPH.

LOCATIONS IMPACTED INCLUDE...
STOCKTON HILL ROAD FROM MILE MARKER 22 TO PIERCE FERRY ROAD. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS EVEN HARDER TO SEE WATER
COVERING THE ROADWAY OR IN LOW WATER CROSSINGS.

&&

LAT...LON 3575 11431 3585 11412 3557 11396 3549 11415

$$

ASG
287 
WGUS75 KVEF 010822
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
122 AM MST WED AUG 1 2012

AZC015-010831-
/O.CAN.KVEF.FF.W.0087.000000T0000Z-120801T0900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
122 AM MST WED AUG 1 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR CENTRAL MOHAVE
COUNTY...

RUNOFF FROM EARLIER STORMS IS LIKELY TO AFFECT TRAVEL ALONG STOCKTON 
HILL ROAD NORTH OF KINGMAN. SOME STANDING WATER IS POSSIBLE...BUT 
THE THREAT OF FLASH FLOODING HAS ENDED. 

LAT...LON 3575 11431 3585 11412 3557 11396 3549 11415

$$

ASG

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 1, 2:44 AM MSTFlash Flood WatchVEFMohave20 hr
Aug 1, 1:41 PM MSTFlash Flood WarningVEFMohave2 hr
Aug 1, 4:55 PM MSTSevere Thunderstorm WarningVEFMohave35 min

Nearby

Flash Flood Warnings in Arizona, 2012Every flash flood warning in 2012

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.