Alert archive / Nevada / Flash Flood Warnings in 2012

Flash Flood Warning 157, NWS Las Vegas, NV

August 22, 2012Clark County, Nevada; Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Aug 22, 2012, 12:12 PM PDT for Clark County, Nevada; Mohave County, Arizona. It was in force for 4 hr. 5 reports 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: Aug 22, 2012, 12:12 PM PDT (19:12 UTC)
Expired: Aug 22, 2012, 3:45 PM PDT
In force: 4 hr
Issued by: NWS Las Vegas, NV
Area: Storm-based polygon
Flood severity: None

Counties Mohave County, AZ, Clark County, NV

The radar

The Las Vegas radar (KESX), 43 km from the middle of the area, began a volume at 19:15 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
Aug 22, 12:19 PM PDT	FLASH FLOOD	Valley Of Fire (Slcn2), NV	PARK SERVICE REPORTS THAT MULTIPLE ROADS INSIDE VALLEY OF FIRE STATE PARK ARE CLOSED DUE TO FLOODING ACROSS ROADWAYS.
Aug 22, 12:43 PM PDT	FLASH FLOOD	5 Ne Callville Bay, NV	PARK SERVICE EMPLOYEE REPORTED 6 TO 8 INCHES OF WATER WERE RUNNING ACROSS NORTHSHORE ROAD AT MILE MARKER 7.
Aug 22, 2:00 PM PDT	FLASH FLOOD	8 W Temple Bar, AZ	THE NATIONAL PARK SERVICE REPORTED DEBRIS OVER TEMPLE BAR ROAD. TIME WAS ESTIMATED BASED ON RADAR DATA.
Aug 22, 2:13 PM PDT	FLASH FLOOD	3 Wnw California Wash (, NV	I 15 EXIT 75 IS WASHED OUT DUE TO FLASH FLOODING.
Aug 22, 2:18 PM PDT	FLASH FLOOD	Boulder City, NV	MULTIPLE STREETS IN BOULDER CITY ARE CLOSED DUE TO WATER AND DEBRIS.

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, 7.2 hours before the alert went out and 75 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: 296 J/kg
Mixed-layer CIN: -130 J/kg
Mixed-layer LCL: 1290 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 103 m²/s²
0-3 km storm-relative helicity: 176 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 3.4

Open this sounding in Storm Lab

The text

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

549 
WGUS55 KVEF 221912
FFWVEF
AZC015-NVC003-222115-
/O.NEW.KVEF.FF.W.0157.120822T1912Z-120822T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
1212 PM PDT WED AUG 22 2012

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EXTREME WEST CENTRAL MOHAVE COUNTY IN NORTHWEST ARIZONA...
  CENTRAL CLARK COUNTY IN SOUTHERN NEVADA...

* UNTIL 215 PM PDT/215 PM MST/.

* AT 1202 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED  
VERY HEAVY RAIN FROM NUMEROUS THUNDERSTORMS CAPABLE OF PRODUCING 
FLASH FLOODING EAST OF THE LAS VEGAS VALLEY FROM WILLOW BEACH AND 
NORTH TO THE VALLEY OF FIRE STATE PARK...AND EXTENDING EAST TO 
OVERTON BEACH.

* LOCATIONS IMPACTED INCLUDE...OVERTON...CALLVILLE BAY...CALLVILLE 
BAY CAMPGROUND...ECHO BAY CAMPGROUND...ECHO BAY...VALLEY OF FIRE 
STATE PARK...VALLEY OF FIRE AND OVERTON BEACH.

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!

CAMPERS AND HIKERS SHOULD BE ALERT TO THE POSSIBILITY OF RAPIDLY
RISING WATER AND BE PREPARED TO MOVE QUICKLY TO HIGHER GROUND IF
FLASH FLOODING IS OBSERVED.

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

&&

LAT...LON 3590 11514 3596 11491 3654 11489 3654 11425
      3614 11426 3584 11456 3583 11515

$$

KENNEDY

4 follow-up statements

991 
WGUS75 KVEF 221950
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
1250 PM PDT WED AUG 22 2012

AZC015-NVC003-222115-
/O.CON.KVEF.FF.W.0157.000000T0000Z-120822T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-CLARK NV-
1250 PM PDT WED AUG 22 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 215 PM PDT/215 PM
MST/ FOR CENTRAL CLARK AND EXTREME WEST CENTRAL MOHAVE COUNTIES...

AT 1241 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE VERY HEAVY RAIN FROM NUMEROUS THUNDERSTORMS CAPABLE OF 
PRODUCING FLASH FLOODING EAST OF THE LAS VEGAS VALLEY FROM WILLOW 
BEACH AND NORTH TO THE VALLEY OF FIRE STATE PARK...AND EXTENDING 
EAST TO OVERTON BEACH.

NATIONAL PARK SERVICE EMPLOYEES HAVE REPORTED MULTIPLE ROADS INSIDE 
VALLEY OF FIRE STATE PARK ARE CLOSED DUE TO FLOODING AND 6 TO 8 
INCHES OF WATER RUNNING ACROSS NORTHSHORE ROAD AT MILE MARKER 7. 

LOCATIONS IMPACTED INCLUDE...LAS VEGAS BAY...OVERTON...CALLVILLE 
BAY...CALLVILLE BAY CAMPGROUND...LAS VEGAS BAY CAMPGROUND...ECHO BAY 
CAMPGROUND...ECHO BAY...VALLEY OF FIRE STATE PARK...VALLEY OF FIRE 
AND OVERTON BEACH.

THIS INCLUDES INTERSTATE 15 IN NEVADA BETWEEN MILE MARKERS 64 AND 79.

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.

CAMPERS AND HIKERS SHOULD BE ALERT TO THE POSSIBILITY OF RAPIDLY
RISING WATER AND BE PREPARED TO MOVE QUICKLY TO HIGHER GROUND IF
FLASH FLOODING IS OBSERVED.

&&

LAT...LON 3590 11514 3596 11491 3654 11489 3654 11425
      3614 11426 3584 11456 3583 11515

$$

KENNEDY

015 
WGUS55 KVEF 222046
FFWVEF
AZC015-NVC003-222245-
/O.EXT.KVEF.FF.W.0157.000000T0000Z-120822T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
146 PM PDT WED AUG 22 2012

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
  EXTREME WEST CENTRAL MOHAVE COUNTY IN NORTHWEST ARIZONA...
  CENTRAL CLARK COUNTY IN SOUTHERN NEVADA...

* UNTIL 345 PM PDT/345 PM MST/.

* AT 142 PM MST...MODERATE TO HEAVY RAIN IS IS CONTINUING FALL EAST 
OF THE LAS VEGAS VALLEY FROM WILLOW BEACH AND NORTH TO THE VALLEY OF 
FIRE STATE PARK...AND EXTENDING EAST TO OVERTON BEACH. ANY 
ADDITIONAL RAIN WILL SUPPORT CONTINUED LOCALIZED AREAS OF FLASH 
FLOODING ACROSS THE WARNED AREA...SO THE WARNING HAS BEEN EXTENDED 
TO 345 PM TODAY.

NATIONAL PARK SERVICE EMPLOYEES HAVE REPORTED MULTIPLE ROADS INSIDE 
VALLEY OF FIRE STATE PARK ARE CLOSED DUE TO FLOODING AND 6 TO 8 
INCHES OF WATER RUNNING ACROSS NORTHSHORE ROAD AT MILE MARKER 7. 

* LOCATIONS IMPACTED INCLUDE...
  LAS VEGAS BAY...OVERTON...CALLVILLE BAY...CALLVILLE BAY
  CAMPGROUND...LAS VEGAS BAY CAMPGROUND...ECHO BAY 
CAMPGROUND...ECHO   BAY...VALLEY OF FIRE STATE PARK...VALLEY OF FIRE 
AND OVERTON BEACH.

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.

CAMPERS AND HIKERS SHOULD BE ALERT TO THE POSSIBILITY OF RAPIDLY
RISING WATER AND BE PREPARED TO MOVE QUICKLY TO HIGHER GROUND IF
FLASH FLOODING IS OBSERVED.

&&

LAT...LON 3590 11514 3596 11491 3654 11489 3654 11425
      3614 11426 3584 11456 3583 11515

$$

KENNEDY

111 
WGUS75 KVEF 222240
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
340 PM PDT WED AUG 22 2012

AZC015-NVC003-222245-
/O.CON.KVEF.FF.W.0157.000000T0000Z-120822T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-CLARK NV-
340 PM PDT WED AUG 22 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 345 PM PDT/345 PM
MST/ FOR CENTRAL CLARK AND EXTREME WEST CENTRAL MOHAVE COUNTIES...

AT 330 PM MST...ALTHOUGH RAIN HAS RECENTLY DECREASED OVER THE PAST 
HOUR NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATES ADDITIONAL 
STORMS MOVING EAST AND SOUTH OF THE LAS VEGAS VALLEY FROM SLOAN TO 
WILLOW BEACH AND NORTH TO THE VALLEY OF FIRE STATE PARK...EXTENDING 
EAST TO OVERTON BEACH. THESE ADDITIONAL STORMS WILL RESULT IN 
CONTINUED FLASH FLOODING OVER THE WARNED AREA.

LOCATIONS IMPACTED INCLUDE...BOULDER CITY...LAS VEGAS 
BAY...OVERTON...CALLVILLE BAY...CALLVILLE BAY CAMPGROUND...LAS VEGAS 
BAY CAMPGROUND...ECHO BAY CAMPGROUND...ECHO BAY...VALLEY OF FIRE 
STATE PARK...VALLEY OF FIRE AND OVERTON BEACH.

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. 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 3590 11514 3596 11491 3654 11489 3654 11425
      3614 11426 3584 11456 3583 11515

$$

KENNEDY

619 
WGUS75 KVEF 222248
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
348 PM PDT WED AUG 22 2012

AZC015-NVC003-222254-
/O.EXP.KVEF.FF.W.0157.000000T0000Z-120822T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-CLARK NV-
348 PM PDT WED AUG 22 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 345 PM PDT/345 PM MST/ FOR
CENTRAL CLARK AND EXTREME WEST CENTRAL MOHAVE COUNTIES...

THIS FLASH FLOOD WARNING SET TO EXPIRE AT 345 PM HAS BEEN REPLACED 
BY A NEW WARNING COVERING THE SAME AREAS VALID UNTIL 545 PM PDT / 
545 PM MST TODAY. 


LAT...LON 3590 11514 3596 11491 3654 11489 3654 11425
      3614 11426 3584 11456 3583 11515

$$

KENNEDY

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 21, 6:10 PM PDT	Flash Flood Warning	VEF	Clark, Lincoln	2 hr
Aug 21, 6:47 PM PDT	Flash Flood Warning	VEF	Lincoln	118 min
Aug 22, 12:12 AM PDT	Flash Flood Warning	VEF	Clark	2 hr
Aug 22, 2:35 AM PDT	Flash Flood Warning	VEF	Clark	115 min
Aug 22, 8:22 AM PDT	Areal Flood Advisory	VEF	Clark	9 hr
Aug 22, 9:19 AM PDT	Areal Flood Advisory	VEF	Clark, Lincoln, Nye	3 hr
Aug 22, 9:20 AM PDT	Flash Flood Warning	VEF	Clark	101 min
Aug 22, 9:34 AM PDT	Flash Flood Warning	VEF	Clark	116 min
Aug 22, 9:59 AM PDT	Flash Flood Warning	VEF	Clark	59 min
Aug 22, 10:05 AM PDT	Flash Flood Warning	VEF	Esmeralda	76 min
Aug 22, 10:53 AM PDT	Flash Flood Warning	VEF	Clark	4 hr
Aug 22, 12:33 PM PDT	Flash Flood Warning	VEF	Clark	117 min
Aug 22, 2:40 PM PDT	Areal Flood Advisory	VEF	Clark	6 hr
Aug 22, 3:43 PM PDT	Flash Flood Warning	VEF	Clark	2 hr
Aug 21, 7:18 PM PDT	Areal Flood Advisory	VEF	Mohave	87 min
Aug 21, 11:32 PM PDT	Areal Flood Advisory	VEF	Mohave	118 min

Nearby

Flash Flood Warnings in Nevada, 2012 Flash Flood Warnings in Arizona, 2012 Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.