Alert archive / Nevada / Flash Flood Warnings in 2011

Flash Flood Warning 13, NWS Las Vegas, NV

July 5, 2011Clark County, Nevada

NWS Las Vegas, NV issued this flash flood warning at Jul 5, 2011, 1:12 PM PDT for Clark County, Nevada. It was in force for 2 hr. 2 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: Jul 5, 2011, 1:12 PM PDT (20:12 UTC)
Expired: Jul 5, 2011, 3:15 PM PDT
In force: 2 hr
Issued by: NWS Las Vegas, NV
Area: Storm-based polygon
Flood severity: None

County Clark County, NV

The radar

The Las Vegas radar (KESX), 68 km from the middle of the area, began a volume at 20:13 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
Jul 5, 3:00 PM PDT	FLASH FLOOD	4 S Red Rock Canyon, NV	NEWSPAPER REPORTS ROADS WASHED OUT IN SPRING MOUNTAIN RANCH STATE PARK DUE TO FLASH FLOODING
Jul 5, 3:00 PM PDT	HEAVY RAIN 1.73	Spring Mountain Ranch, NV	THE SPRING MOUNTAIN RANCH STATE PARK CO-OP OBSERVER MEASURED 1.73 INCHES OF RAIN FROM A THUNDERSTORM.

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, 8.2 hours before the alert went out and 35 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: 2419 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 3 m²/s²
0-3 km storm-relative helicity: 137 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.

276 
WGUS55 KVEF 052012
FFWVEF
NVC003-052215-
/O.NEW.KVEF.FF.W.0013.110705T2012Z-110705T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
112 PM PDT TUE JUL 5 2011

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WEST CENTRAL CLARK COUNTY IN SOUTHERN NEVADA...

* UNTIL 315 PM PDT.

* AT 109 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED  
ONE TO TWO INCHES OF RAIN HAD FALLEN FROM A THUNDERSTORM NEAR 
MOUNTAIN SPRINGS...OR 6 MILES SOUTHWEST OF RED ROCK CANYON. THE 
STORM PRODUCING VERY HEAVY RAIN WAS NEARLY STATIONARY.

* LOCATIONS IMPACTED INCLUDE...MOUNTAIN SPRINGS...SPRING MOUNTAIN 
RANCH...AND HIGHWAY 160 NEAR MOUNTAIN SPRINGS.

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.

&&

LAT...LON 3611 11553 3612 11549 3608 11545 3600 11543
      3599 11549 3602 11555

$$

JGG

3 follow-up statements

413 
WGUS75 KVEF 052045
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
145 PM PDT TUE JUL 5 2011

NVC003-052215-
/O.CON.KVEF.FF.W.0013.000000T0000Z-110705T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CLARK NV-
145 PM PDT TUE JUL 5 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 315 PM PDT FOR WEST
CENTRAL CLARK COUNTY...

AT 141 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A THUNDERSTORM PRODUCING VERY HEAVY RAIN.  THIS STORM WAS
LOCATED NEAR MOUNTAIN SPRINGS...OR 9 MILES SOUTH OF RED ROCK CANYON. 
THE THUNDERSTORM WITH EXCESSIVE RAIN WAS NEARLY STATIONARY. RADAR 
ESTIMATES AS MUCH AS THREE INCHES OF RAIN HAS FALLEN JUST NORTH OF 
HIGHWAY 160 SINCE 1245 PM.

LOCATIONS IMPACTED INCLUDE...MOUNTAIN SPRINGS...AND HIGHWAY 160 FROM 
MILE MARKER 15 TO 24.

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 TWITTER #NWSVEGAS.

&&

LAT...LON 3611 11553 3612 11549 3608 11545 3600 11543
      3599 11549 3602 11555

$$

JGG

773 
WGUS75 KVEF 052138
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
238 PM PDT TUE JUL 5 2011

NVC003-052215-
/O.CON.KVEF.FF.W.0013.000000T0000Z-110705T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CLARK NV-
238 PM PDT TUE JUL 5 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 315 PM PDT FOR WEST
CENTRAL CLARK COUNTY...

AT 234 PM PDT...THUNDERSTORMS WERE GENERALLY DECREASING IN INTENSITY 
NEAR MOUNTAIN SPRINGS...OR 9 MILES SOUTH OF RED ROCK CANYON...BUT 
RADAR INDICATED SEVERAL INCHES OF RAIN HAS FALLEN IN THE AREA AND 
THE THREAT FOR FLASH FLOODING CONTINUES. 

LOCATIONS IMPACTED INCLUDE...MOUNTAIN SPRINGS...AND HIGHWAY 160 NEAR 
MOUNTAIN SPRINGS.

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.

&&

LAT...LON 3611 11553 3612 11549 3608 11545 3600 11543
      3599 11549 3602 11555

$$

JGG

457 
WGUS75 KVEF 052211
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
311 PM PDT TUE JUL 5 2011

NVC003-052220-
/O.EXP.KVEF.FF.W.0013.000000T0000Z-110705T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CLARK NV-
311 PM PDT TUE JUL 5 2011

...THE FLASH FLOOD WARNING WILL EXPIRE AT 315 PM PDT FOR WEST CENTRAL
CLARK COUNTY...

HOWEVER THIS WARNING HAS BEEN INCORPORATED INTO A NEW WARNING FOR 
THE SAME AREA AS THUNDERSTORMS CAPABLE OF PRODUCING HEAVY RAINFALL 
AND FLASH FLOODING ARE CONTINUING TO MOVE ACROSS THE AREA.

LAT...LON 3611 11553 3612 11549 3608 11545 3600 11543
      3599 11549 3602 11555

$$
JENSEN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 5, 12:14 PM PDT	Flash Flood Warning	VEF	Clark	76 min
Jul 5, 12:54 PM PDT	Severe Thunderstorm Warning	VEF	Clark	36 min
Jul 5, 2:01 PM PDT	Severe Thunderstorm Warning	VEF	Clark	33 min
Jul 5, 2:21 PM PDT	Flash Flood Warning	VEF	Clark	114 min
Jul 5, 3:01 PM PDT	Flash Flood Warning	VEF	Clark	89 min
Jul 5, 3:09 PM PDT	Flash Flood Warning	VEF	Clark	2 hr
Jul 5, 3:46 PM PDT	Areal Flood Advisory	VEF	Clark, Esmeralda, Lincoln, Nye	119 min
Jul 5, 4:10 PM PDT	Flash Flood Warning	VEF	Clark	110 min

Nearby

Flash Flood Warnings in Nevada, 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.