Alert archive / Arizona / Flash Flood Warnings in 2011

Flash Flood Warning 103, NWS Las Vegas, NV

October 4, 2011Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Oct 4, 2011, 7:31 AM MST for Mohave County, Arizona. It was in force for 3 hr. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Oct 4, 2011, 7:31 AM MST (14:31 UTC)
Expired: Oct 4, 2011, 10:30 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), 48 km from the middle of the area, began a volume at 14:31 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.

What was reported inside it

Time	Report	Where	Remark
Oct 4, 9:00 AM MST	FLASH FLOOD	8 W Temple Bar, AZ	WATER AND DEBRIS WERE FLOWING ACROSS TEMPLE BAR ROAD BETWEEN MILE MARKERS 14 AND 19.5.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Las Vegas, NV (KVEF), launched 12:00Z, 2.5 hours before the alert went out and 107 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 722 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 903 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 32 m²/s²
0-3 km storm-relative helicity: 86 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.9

Open this sounding in Storm Lab

The text

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

303 
WGUS55 KVEF 041431
FFWVEF
AZC015-041730-
/O.NEW.KVEF.FF.W.0103.111004T1431Z-111004T1730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
731 AM MST TUE OCT 4 2011

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 1030 AM MST.

* AT 726 AM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
A BAND OF VERY HEAVY RAIN FROM JUST NORTHWEST OF TEMPLE BAR...TO 
NEAR THE INTERSECTION OF TEMPLE BAR ROAD AND HIGHWAY 93. RADAR AND 
RAIN GAUGES ESTIMATE AROUND AN INCH OF RAIN HAS FALLEN SINCE 630 
PM...WITH MORE HEAVY RAIN EXPECTED.

* LOCATIONS IMPACTED INCLUDE...TEMPLE BAR ROAD...DETRIAL 
WASH...BONELL LANDING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLASH FLOODING IS EXPECTED IN WASHES...LOW WATER CROSSINGS AND ON
AREA ROADWAYS. FLASH FLOODING IS NATURES NUMBER ONE KILLER. TO ESCAPE
RISING WATER...MOVE TO HIGHER GROUND. 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 3611 11446 3601 11439 3596 11439 3582 11444
      3580 11451 3592 11457

$$

JGG

4 follow-up statements

167 
WGUS75 KVEF 041453
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
753 AM MST TUE OCT 4 2011

AZC015-041730-
/O.CON.KVEF.FF.W.0103.000000T0000Z-111004T1730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
753 AM MST TUE OCT 4 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1030 AM MST FOR WEST
CENTRAL MOHAVE COUNTY...

AT 749 AM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A LINE OF THUNDERSTORMS PRODUCING MODERATE TO HEAVY RAIN 
THESE STORMS WERE LOCATED FROM NEAR THE INTERSECTION OF HIGHWAY 93 
AND TEMPLE BAR ROAD...TO 10 MILES WEST OF TEMPLE BAR. THE 
THUNDERSTORMS ARE MOVING NORTH ALONG THE SAME AREA AND ADDITIONAL 
HEAVY RAIN IS EXPECTED.

LOCATIONS IMPACTED INCLUDE...
THE DETRITAL WASH...TEMPLE BAR ROAD...AND BONELLI LANDING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLASH FLOODING IS EXPECTED IN WASHES...LOW WATER CROSSINGS AND ON
AREA ROADWAYS. FLASH FLOODING IS NATURES NUMBER ONE KILLER. TO ESCAPE
RISING WATER...MOVE TO HIGHER GROUND. 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 3611 11446 3601 11439 3596 11439 3582 11444
      3580 11451 3592 11457

$$

JGG

807 
WGUS75 KVEF 041533
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
833 AM MST TUE OCT 4 2011

AZC015-041730-
/O.CON.KVEF.FF.W.0103.000000T0000Z-111004T1730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
833 AM MST TUE OCT 4 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1030 AM MST FOR WEST
CENTRAL MOHAVE COUNTY...

AT 829 AM MST...RADAR INDICATED MODERATE TO HEAVY RAIN CONTINUES 
WEST OF TEMPLE BAR NEAR WHERE DETRITAL WASH CROSSES TEMPLE BAR ROAD. 
RAINFALL IS EXPECTED TO REDUCE IN INTENSITY THROUGH 930 AM BUT 
ENOUGH RAINFALL HAS ALREADY FALLEN TO PRODUCE A THREAT OF FLASH 
FLOODING THROUGH 1030 AM.

LOCATIONS IMPACTED INCLUDE...TEMPLE BAR ROAD AND DETRITAL WASH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLASH FLOODING IS EXPECTED IN WASHES...LOW WATER CROSSINGS AND ON
AREA ROADWAYS. FLASH FLOODING IS NATURES NUMBER ONE KILLER. TO ESCAPE
RISING WATER...MOVE TO HIGHER GROUND. 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 3611 11446 3601 11439 3596 11439 3582 11444
      3580 11451 3592 11457

$$

JGG

328 
WGUS75 KVEF 041629
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
929 AM MST TUE OCT 4 2011

AZC015-041730-
/O.CON.KVEF.FF.W.0103.000000T0000Z-111004T1730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
929 AM MST TUE OCT 4 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1030 AM MST FOR WEST
CENTRAL MOHAVE COUNTY...

AT 922 AM MST...RADAR INDICATED THUNDERSTORMS WITH HEAVY RAIN MOVING 
SLOWLY EAST TOWARD TEMPLE BAR. AT 915 AM...THE PARK SERVICE REPORTED 
WATER AND DEBRIS FLOWING OVER TEMPLE BAR ROAD BETWEEN MILE MARKERS 
14 AND 19. ALTHOUGH THE HEAVY RAIN HAS MOVED SLIGHTLY EAST OF THIS 
AREA...RUNOFF WILL CONTINUE THROUGH 1030 AM...ESPECIALLY IN DETRITAL 
WASH.

LOCATIONS IMPACTED INCLUDE...
TEMPLE BAR ROAD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLASH FLOODING IS EXPECTED IN WASHES...LOW WATER CROSSINGS AND ON
AREA ROADWAYS. FLASH FLOODING IS NATURES NUMBER ONE KILLER. TO ESCAPE
RISING WATER...MOVE TO HIGHER GROUND. 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 3611 11446 3601 11439 3596 11439 3582 11444
      3580 11451 3592 11457

$$

MORGAN

112 
WGUS75 KVEF 041724
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
1024 AM MST TUE OCT 4 2011

AZC015-041733-
/O.EXP.KVEF.FF.W.0103.000000T0000Z-111004T1730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
1024 AM MST TUE OCT 4 2011

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

AT 1020 AM MST...RADAR INDICATED THAT RAIN HAD ENDED IN THE TEMPLE 
BAR AREA. WATER HAD LIKELY RECEDED IN THE AREA...AND THE FLASH FLOOD 
WARNING WILL BE ALLOWED TO EXPIRE.

LAT...LON 3611 11446 3601 11439 3596 11439 3582 11444
      3580 11451 3592 11457

$$

MORGAN

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 3, 6:45 PM MST	Areal Flood Advisory	VEF	Mohave	46 min
Oct 3, 11:12 PM MST	Areal Flood Advisory	VEF	Mohave	2 hr
Oct 4, 4:05 AM MST	Flash Flood Watch	VEF	Mohave	15 hr
Oct 4, 4:57 AM MST	Areal Flood Advisory	VEF	Mohave	5 hr
Oct 4, 6:40 AM MST	Severe Thunderstorm Warning	VEF	Mohave	12 min
Oct 4, 1:06 PM MST	Severe Thunderstorm Warning	VEF	Mohave	39 min
Oct 4, 2:14 PM MST	Wind Advisory	VEF		36 hr
Oct 4, 2:35 PM MST	Severe Thunderstorm Warning	VEF	Mohave	15 min

Nearby

Flash Flood Warnings in Arizona, 2011 Every flash flood warning in 2011

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.