Alert archive / Arizona / Flash Flood Warnings in 2012

Flash Flood Warning 228, NWS Las Vegas, NV

October 12, 2012Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Oct 12, 2012, 2:58 PM MST for Mohave County, Arizona. It was in force for 62 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
Oct 12, 2012, 2:58 PM MST (21:58 UTC)
Expired
Oct 12, 2012, 4:00 PM MST
In force
62 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), 74 km from the middle of the area, began a volume at 21:57 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 12:00Z, 10.0 hours before the alert went out and 168 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 12:00Z on 2012-10-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 29 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 12:00Z on 2012-10-12The 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
29 J/kg
Mixed-layer CIN
-61 J/kg
Mixed-layer LCL
1138 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
18 m²/s²
0-3 km storm-relative helicity
45 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.

330 
WGUS55 KVEF 122158
FFWVEF
AZC015-122300-
/O.NEW.KVEF.FF.W.0228.121012T2158Z-121012T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
258 PM MST FRI OCT 12 2012

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 400 PM MST/400 PM PDT/.

* AT 253 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM NEAR BULLHEAD CITY. THE STORM
  PRODUCING VERY HEAVY RAIN WAS NEARLY STATIONARY.

* LOCATIONS IMPACTED INCLUDE...
  BULLHEAD CITY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLASH FLOODING IS EXPECTED ON AREA ROADWAYS...AROUND UNDERPASSES...
AND IN NORMALLY DRY WASHES AND LOW LYING AREAS. FLASH FLOODING IS
NATURES NUMBER ONE KILLER. NEVER TRY TO CROSS A FLOODED ROADWAY OR
WALK THROUGH FLOODWATERS. TURN AROUND...DONT DROWN!

REPORT FLOODING BY POSTING YOUR REPORT TO THE LAS VEGAS NATIONAL
WEATHER SERVICE FACEBOOK PAGE...OR BY USING THE TWITTER HASHTAG...
NWSVEGAS.

&&

LAT...LON 3507 11459 3511 11464 3511 11459 3513 11457
      3516 11456 3520 11435 3501 11440 3503 11462

$$

JENSEN
2 follow-up statements
701 
WGUS75 KVEF 122235
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
335 PM MST FRI OCT 12 2012

AZC015-122300-
/O.CON.KVEF.FF.W.0228.000000T0000Z-121012T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
335 PM MST FRI OCT 12 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 400 PM MST/400 PM
PDT/ FOR WEST CENTRAL MOHAVE COUNTY...

AT 325 PM MST...SHOWERS AND THUNDERSTORMS HAVE MOVED EAST AWAY FROM 
THE BULLHEAD CITY AREA. HOWEVER THE HEAVY RAIN WHICH FELL EARLIER 
WILL CONTINUE TO FLOW THROUGH THE AREA.

LOCATIONS IMPACTED INCLUDE...
BULLHEAD CITY

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLASH FLOODING IS EXPECTED ON AREA ROADWAYS...AROUND UNDERPASSES...
AND IN NORMALLY DRY WASHES AND LOW LYING AREAS. FLASH FLOODING IS
NATURES NUMBER ONE KILLER. NEVER TRY TO CROSS A FLOODED ROADWAY OR
WALK THROUGH FLOODWATERS. TURN AROUND...DONT DROWN!

REPORT FLOODING BY POSTING YOUR REPORT TO THE LAS VEGAS NATIONAL
WEATHER SERVICE FACEBOOK PAGE...OR BY USING THE TWITTER HASHTAG...
NWSVEGAS.

&&

LAT...LON 3507 11459 3511 11464 3511 11459 3513 11457
      3516 11456 3520 11435 3501 11440 3503 11462

$$

JENSEN
254 
WGUS75 KVEF 122253
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
353 PM MST FRI OCT 12 2012

AZC015-122301-
/O.EXP.KVEF.FF.W.0228.000000T0000Z-121012T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
353 PM MST FRI OCT 12 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 400 PM MST FOR WEST 
CENTRAL MOHAVE COUNTY...

SHOWERS AND THUNDERSTORMS HAVE MOVED OUT OF THE AREA AND ALTHOUGH 
WATER MAY STILL BE MOVING THROUGH THE AREA...ADDITIONAL HEAVY 
RAINFALL IS NOT EXPECTED AT THIS TIME. THUS WILL ALLOW THE FLASH 
FLOOD WARNING FOR THE BULLHEAD CITY AREA EXPIRE AS OF 400 PM MST.

LAT...LON 3507 11459 3511 11464 3511 11459 3513 11457
      3516 11456 3520 11435 3501 11440 3503 11462

$$

JENSEN

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 12, 1:43 PM MSTFlash Flood WarningVEFMohave2 hr

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.