Alert archive / Arizona / Flash Flood Warnings in 2015

Flash Flood Warning 69, NWS Las Vegas, NV

July 20, 2015Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Jul 20, 2015, 6:01 AM 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 20, 2015, 6:01 AM MST (13:01 UTC)
Expired
Jul 20, 2015, 9:00 AM 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), 99 km from the middle of the area, began a volume at 13:04 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, 1.0 hours before the alert went out and 170 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 2015-07-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 5 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Las Vegas, NV at 12:00Z on 2015-07-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -14 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
5 J/kg
Mixed-layer CIN
-95 J/kg
Mixed-layer LCL
1754 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
-14 m²/s²
0-3 km storm-relative helicity
77 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.

036 
WGUS55 KVEF 201301
FFWVEF
AZC015-201600-
/O.NEW.KVEF.FF.W.0069.150720T1301Z-150720T1600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
601 AM MST MON JUL 20 2015

THE NATIONAL WEATHER SERVICE IN LAS VEGAS  HAS ISSUED A

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

* UNTIL 900 AM MST
    
* AT 558 AM MST...DOPPLER RADAR INDICATED A THUNDERSTORM PRODUCING 
  HEAVY RAIN OVER MAINLY RURAL AREAS OF MOHAVE COUNTY . THE RAIN IS 
  MOVING NORTHEAST AT 25 MPH. FLASH FLOODING IS EXPECTED TO BEGIN 
  SHORTLY.

* LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  INDIAN ROUTE 1 (BUCK AND DOE ROAD)...
  AND THE INTERSECTION OF DIAMOND BAR ROAD AND BUCK AND DOE ROAD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLASH FLOODING IS EXPECTED ON ROADS...IN NORMALLY DRY WASHES AND LOW
LYING AREAS. NEVER TRY TO CROSS A FLOODED ROAD OR ENTER A FLOOD
CHANNEL. TURN AROUND...DONT DROWN! REPORT FLOODING TO THE LAS VEGAS
NATIONAL WEATHER SERVICE VIA FACEBOOK OR TWITTER.

&&

LAT...LON 3599 11384 3560 11347 3547 11379 3583 11405

$$

STEELE
2 follow-up statements
439 
WGUS75 KVEF 201431
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
731 AM MST MON JUL 20 2015

AZC015-201600-
/O.CON.KVEF.FF.W.0069.000000T0000Z-150720T1600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
731 AM MST MON JUL 20 2015

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 900 AM MST FOR
CENTRAL MOHAVE COUNTY...

AT 728 AM MST...DOPPLER RADAR INDICATED HEAVY RAIN ACROSS THE WARNED
AREA. UP TO ONE INCH OF RAIN HAS ALREADY FALLEN. FLASH FLOODING IS
LIKELY ALREADY OCCURRING.

FLASH FLOODING WILL REMAIN OVER MAINLY RURAL AREAS OF CENTRAL MOHAVE
COUNTY ALONG INDIAN ROUTE 1 (BUCK AND DOE ROAD) AND THE INTERSECTION 
OF DIAMOND BAR ROAD AND BUCK AND DOE ROAD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLASH FLOODING IS EXPECTED ON ROADS...IN NORMALLY DRY WASHES AND LOW
LYING AREAS. ALTHOUGH THE HEAVY THUNDERSTORMS THAT PROMPTED THE 
WARNING HAVE MOVED OUT OF THE AREA...ADDITIONAL SHOWERS AND 
THUNDERSTORMS CONTINUE TO DEVELOP UP WIND AND WILL CONTINUE TO MOVE 
OVER AREAS ALREADY IMPACTED BY HEAVY RAIN. NEVER TRY TO CROSS A 
FLOODED ROAD OR ENTER A FLOOD CHANNEL. REPORT FLOODING TO THE LAS 
VEGAS NATIONAL WEATHER SERVICE VIA FACEBOOK OR TWITTER.

TURN AROUND...DONT DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 3599 11384 3560 11347 3547 11379 3583 11405

$$

STEELE
699 
WGUS75 KVEF 201552
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
852 AM MST MON JUL 20 2015

AZC015-201602-
/O.EXP.KVEF.FF.W.0069.000000T0000Z-150720T1600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
852 AM MST MON JUL 20 2015

...THE FLASH FLOOD WARNING FOR CENTRAL MOHAVE COUNTY WILL EXPIRE AT
900 AM MST...

THE HEAVY RAIN HAS ENDED...AND FLOODING IS NO LONGER EXPECTED TO POSE
A THREAT...HOWEVER...ADDITIONAL SHOWERS ARE POSSIBLE IN THE NEXT ONE 
TO TWO HOURS.

LAT...LON 3599 11384 3560 11347 3547 11379 3583 11405

$$

STEELE

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 20, 1:46 AM MSTFlash Flood WarningVEFMohave3 hr
Jul 20, 4:58 AM MSTFlash Flood WarningVEFMohave3 hr

Nearby

Flash Flood Warnings in Arizona, 2015Every flash flood warning in 2015

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.