Alert archive / Arizona / Flash Flood Warnings in 2011

Flash Flood Warning 24, NWS Las Vegas, NV

July 6, 2011Mohave County, Arizona; Clark County, Nevada; San Bernardino County, California

NWS Las Vegas, NV issued this flash flood warning at Jul 6, 2011, 12:15 AM MST for Mohave County, Arizona; Clark County, Nevada; San Bernardino County, California. It was in force for 2 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 6, 2011, 12:15 AM MST (07:15 UTC)
Expired: Jul 6, 2011, 2:15 AM MST
In force: 2 hr
Issued by: NWS Las Vegas, NV
Area: Storm-based polygon
Flood severity: None

Counties Mohave County, AZ, San Bernardino County, CA, Clark County, NV

The radar

The Las Vegas radar (KESX), 74 km from the middle of the area, began a volume at 07:16 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, 7.3 hours before the alert went out and 166 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2968 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: -12 m²/s²
0-3 km storm-relative helicity: 7 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.

889 
WGUS55 KVEF 060715
FFWVEF
AZC015-CAC071-NVC003-060915-
/O.NEW.KVEF.FF.W.0024.110706T0715Z-110706T0915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
1215 AM MST WED JUL 6 2011

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHWESTERN MOHAVE COUNTY IN NORTHWEST ARIZONA...
  EAST CENTRAL SAN BERNARDINO COUNTY IN SOUTHERN CALIFORNIA...
  EXTREME SOUTH CENTRAL CLARK COUNTY IN SOUTHERN NEVADA...

* UNTIL 215 AM MST/215 AM PDT/.

* AT 1210 AM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM 9 MILES NORTHEAST OF TOPOCK.   
  THE STORM PRODUCING VERY HEAVY RAIN WAS NEARLY STATIONARY.         
  RAINFALL TOTALS IN EXCESS OF A HALF AN INCH WITH LOCALIZED AMOUNTS 
  EXCEEDING AN INCH WILL BE POSSIBLE. FLOODING OF LOW LYING AREAS    
  ALONG HIGHWAY 95 NEAR NEEDLES AND OTHER LOCATIONS WILL BE POSSIBLE.

* LOCATIONS IMPACTED INCLUDE...BIG BEND RAWS...CAL NEV ARI...
  LAUGHLIN...NEEDLES...BULLHEAD CITY...MOHAVE VALLEY...OATMAN...
  TOPOCK...WILLOW VALLEY...YUCCA...RIVERSIDE ADVENTURE RV PARK...
  HIGHWAY 95 AND I-40...NEEDLES KOA CAMPGROUND AND BIG BEND REC AREA.

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 TWITTER #NWSVEGAS.

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

&&

LAT...LON 3523 11509 3537 11482 3537 11450 3480 11391
      3471 11429 3473 11488

$$

STACHELSKI

2 follow-up statements

288 
WGUS75 KVEF 060815
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
115 AM MST WED JUL 6 2011

AZC015-CAC071-NVC003-060915-
/O.CON.KVEF.FF.W.0024.000000T0000Z-110706T0915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-SAN BERNARDINO CA-CLARK NV-
115 AM MST WED JUL 6 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 215 AM MST/215 AM
PDT/ FOR EXTREME SOUTH CENTRAL CLARK...EAST CENTRAL SAN BERNARDINO
AND SOUTHWESTERN MOHAVE COUNTIES...

AT 110 AM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A CLUSTER OF THUNDERSTORMS PRODUCING VERY HEAVY RAIN. THIS 
STORM WAS LOCATED NEAR RIVERSIDE ADVENTURE RV PARK...OR 8 MILES 
SOUTH OF BULLHEAD CITY. THE THUNDERSTORMS WITH EXCESSIVE RAIN WERE 
NEARLY STATIONARY. RADAR ESTIMATES OF A HALF INCH OF RAIN HAVE BEEN 
REPORTED IN SOME AREAS...MAINLY OVER FAR SOUTHERN CLARK COUNTY 
BETWEEN LAUGHLIN AND THE CALIFORNIA-NEVADA STATE LINE AND TO THE 
SOUTH OF OATMAN IN ARIZONA.

LOCATIONS IMPACTED INCLUDE...BIG BEND RAWS...CAL NEV ARI...
LAUGHLIN...NEEDLES...BULLHEAD CITY...MOHAVE VALLEY...OATMAN...
TOPOCK...WILLOW VALLEY...YUCCA...RIVERSIDE ADVENTURE RV PARK...
HIGHWAY 95 AND I-40...NEEDLES KOA CAMPGROUND AND BIG BEND REC AREA.

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 TWITTER #NWSVEGAS.

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

&&

LAT...LON 3523 11509 3537 11482 3537 11450 3480 11391
      3471 11429 3473 11488

$$

STACHELSKI

683 
WGUS75 KVEF 060907
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
207 AM MST WED JUL 6 2011

AZC015-CAC071-NVC003-060915-
/O.EXP.KVEF.FF.W.0024.000000T0000Z-110706T0915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-SAN BERNARDINO CA-CLARK NV-
207 AM MST WED JUL 6 2011

...THE FLASH FLOOD WARNING WILL EXPIRE AT 215 AM MST/215 AM PDT/ FOR
EXTREME SOUTH CENTRAL CLARK...EAST CENTRAL SAN BERNARDINO AND
SOUTHWESTERN MOHAVE COUNTIES...

NATIONAL WEATHER SERVICE RADAR INDICATED MOST OF THE RAIN FALLING 
ACROSS EXTREME SOUTHERN CLARK COUNTY...EAST CENTRAL SAN BERNARDINO 
COUNTY AND SOUTHWESTERN MOHAVE COUNTY HAD BECOME LIGHTER IN 
INTENSITY. THEREFORE THE FLASH FLOOD WARNING WILL BE ALLOWED TO 
EXPIRE.

LAT...LON 3523 11509 3537 11482 3537 11450 3480 11391
      3471 11429 3473 11488

$$

STACHELSKI

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 5, 6:18 PM MST	Flash Flood Warning	VEF	Mohave	50 min
Jul 5, 6:23 PM MST	Flash Flood Warning	VEF	Mohave	82 min
Jul 5, 11:19 PM MST	Areal Flood Advisory	VEF	Mohave	76 min
Jul 5, 11:49 PM MST	Flash Flood Warning	VEF	Mohave	116 min
Jul 6, 12:04 AM MST	Severe Thunderstorm Warning	VEF	Mohave	41 min
Jul 6, 4:40 AM MST	Flash Flood Watch	VEF	Mohave	17 hr
Jul 6, 1:39 PM MST	Flash Flood Warning	VEF	Mohave	39 min
Jul 5, 8:45 PM MST	Areal Flood Advisory	VEF	Clark, Nye	2 hr
Jul 6, 10:58 AM MST	Areal Flood Advisory	VEF	Clark, Nye	66 min
Jul 6, 12:25 PM MST	Areal Flood Advisory	VEF	Esmeralda, Lincoln, Nye	3 hr
Jul 6, 12:49 PM MST	Severe Thunderstorm Warning	VEF	Clark	26 min
Jul 6, 1:01 PM MST	Areal Flood Advisory	VEF	Clark, Nye	21 min
Jul 6, 1:19 PM MST	Flash Flood Warning	VEF	Clark	80 min
Jul 6, 2:05 PM MST	Areal Flood Advisory	VEF	Lincoln	3 hr
Jul 6, 3:10 PM MST	Areal Flood Advisory	VEF	Lincoln	2 hr
Jul 6, 3:26 PM MST	Areal Flood Advisory	VEF	Esmeralda, Lincoln, Nye	2 hr
Jul 6, 12:14 PM MST	Areal Flood Advisory	VEF	Inyo	2 hr
Jul 6, 12:31 PM MST	Areal Flood Advisory	VEF	Inyo	119 min
Jul 6, 1:12 PM MST	Flash Flood Warning	VEF	Inyo	2 hr
Jul 6, 1:29 PM MST	Flash Flood Warning	VEF	Inyo	2 hr
Jul 6, 4:07 PM MST	Flash Flood Warning	VEF	Inyo	3 hr
Jul 6, 4:12 PM MST	Flash Flood Warning	VEF	Inyo	3 hr
Jul 6, 4:55 PM MST	Flash Flood Warning	VEF	Inyo	2 hr

Nearby

Flash Flood Warnings in Arizona, 2011 Flash Flood Warnings in Nevada, 2011 Flash Flood Warnings in California, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.