Alert archive / Nevada / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 13, NWS Las Vegas, NV

July 20, 2013Clark County, Nevada

NWS Las Vegas, NV issued this severe thunderstorm warning at Jul 20, 2013, 8:32 PM PDT for Clark County, Nevada. It was in force for 43 min. 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 20, 2013, 8:32 PM PDT (03:32 UTC)
Expired: Jul 20, 2013, 9:15 PM PDT
In force: 43 min
Issued by: NWS Las Vegas, NV
Area: Storm-based polygon

County Clark County, NV

The radar

The Las Vegas radar (KESX), 61 km from the middle of the area, began a volume at 03:33 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 20, 8:49 PM PDT	TSTM WND GST 59	4 Nw Las Vegas, NV
Jul 20, 9:00 PM PDT	TSTM WND DMG	5 Wnw Las Vegas, NV	A PATIO COVER WAS BLOWN OFF A HOME NEAR WEST LAKE MEAD BOULEVARD AND JONES. THE EVENT TIME IS AN ESTIMATE.

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 00:00Z, 3.5 hours before the alert went out and 37 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: 453 J/kg
Mixed-layer CIN: -76 J/kg
Mixed-layer LCL: 3278 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: -3 m²/s²
0-3 km storm-relative helicity: 118 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.

504 
WUUS55 KVEF 210332
SVRVEF
NVC003-210415-
/O.NEW.KVEF.SV.W.0013.130721T0332Z-130721T0415Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
832 PM PDT SAT JUL 20 2013

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL CLARK COUNTY IN SOUTHERN NEVADA...

* UNTIL 915 PM PDT.

* AT 825 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.   

* LOCATIONS IMPACTED INCLUDE...
  MAINLY THE NORTHWESTERN AND NORTHERN PORTION OF THE LAS VEGAS
  VALLEY...INCLUDING BUT NOT LIMITED TO SUMMERLIN...LONE 
  MOUNTAIN...SPRING VALLEY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM IS CAPABLE OF PRODUCING DAMAGING WINDS WHICH CAN BRING
DOWN TREES AND POWER LINES AND CAUSE SIGNIFICANT BLOWING DUST AND
DEBRIS. IN ADDITION...HAIL AND LIGHTNING ARE LIKELY. LIGHTNING CAN
KILL! TAKE COVER IN A SUBSTANTIAL SHELTER AND STAY AWAY FROM WINDOWS
UNTIL THE STORM PASSES.

REPORT SEVERE WEATHER BY POSTING YOUR REPORT TO THE LAS VEGAS
NATIONAL WEATHER SERVICE FACEBOOK PAGE...OR ON TWITTER USING...AT
NWSVEGAS.

&&

LAT...LON 3615 11511 3607 11524 3610 11535 3626 11535
      3634 11518 3628 11504
TIME...MOT...LOC 0330Z 054DEG 11KT 3617 11524

$$

JENSEN

2 follow-up statements

130 
WWUS55 KVEF 210353
SVSVEF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
853 PM PDT SAT JUL 20 2013

NVC003-210415-
/O.CON.KVEF.SV.W.0013.000000T0000Z-130721T0415Z/
CLARK NV-
853 PM PDT SAT JUL 20 2013

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM PDT
FOR CENTRAL CLARK COUNTY...

AT 846 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH. SPOTTERS IN THE AREA AS WELL AS REPORTS AT THE 
NORTH LAS VEGAS AIRPORT HAVE SHOWN THAT WINDS HAVE REACHED 60 MPH IN 
THE NORTH PART OF THE LAS VEGAS VALLEY.

LOCATIONS IMPACTED INCLUDE...
MAINLY THE NORTHWESTERN AND NORTHERN PORTION OF THE LAS VEGAS   
VALLEY...INCLUDING BUT NOT LIMITED TO SUMMERLIN...LONE   
MOUNTAIN...SPRING VALLEY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM IS CAPABLE OF PRODUCING DAMAGING WINDS WHICH CAN BRING
DOWN TREES AND POWER LINES AND CAUSE SIGNIFICANT BLOWING DUST AND
DEBRIS. IN ADDITION...HAIL AND LIGHTNING ARE LIKELY. LIGHTNING CAN
KILL! TAKE COVER IN A SUBSTANTIAL SHELTER AND STAY AWAY FROM WINDOWS
UNTIL THE STORM PASSES.

REPORT SEVERE WEATHER BY POSTING YOUR REPORT TO THE LAS VEGAS
NATIONAL WEATHER SERVICE FACEBOOK PAGE...OR ON TWITTER USING...AT
NWSVEGAS.

&&

LAT...LON 3615 11511 3607 11524 3610 11535 3626 11535
      3634 11518 3628 11504
TIME...MOT...LOC 0352Z 054DEG 11KT 3613 11531

$$

JENSEN

442 
WWUS55 KVEF 210415
SVSVEF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
915 PM PDT SAT JUL 20 2013

NVC003-210424-
/O.EXP.KVEF.SV.W.0013.000000T0000Z-130721T0415Z/
CLARK NV-
915 PM PDT SAT JUL 20 2013

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL CLARK COUNTY WILL
EXPIRE AT 915 PM PDT...

THIS THUNDERSTORM IS STILL SEVERE. A NEW WARNING IS BEING ISSUED 
TO EXPAND THE AREA IMPACTED BY THIS STORM. PLEASE SEE THE LATEST 
SEVERE THUNDERSTORM WARNING FOR DETAILS.

LAT...LON 3615 11511 3607 11524 3610 11535 3626 11535
      3634 11518 3628 11504
TIME...MOT...LOC 0414Z 054DEG 11KT 3609 11538

$$

WOLCOTT

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 5:19 PM PDT	Severe Thunderstorm Warning	VEF	Clark, Lincoln	41 min
Jul 20, 6:15 PM PDT	Flash Flood Warning	VEF	Lincoln	90 min
Jul 20, 6:54 PM PDT	Flash Flood Warning	VEF	Clark	111 min
Jul 20, 7:59 PM PDT	Flash Flood Warning	VEF	Clark, Nye	2 hr
Jul 20, 8:41 PM PDT	Severe Thunderstorm Warning	VEF	Clark, Nye	34 min
Jul 20, 8:46 PM PDT	Severe Thunderstorm Warning	VEF	Clark	59 min
Jul 20, 9:16 PM PDT	Severe Thunderstorm Warning	VEF	Clark	59 min
Jul 20, 9:20 PM PDT	Flash Flood Warning	VEF	Clark	115 min
Jul 20, 9:32 PM PDT	Flash Flood Warning	VEF	Clark	118 min
Jul 20, 9:40 PM PDT	Severe Thunderstorm Warning	VEF	Clark	50 min
Jul 20, 10:35 PM PDT	Flash Flood Warning	VEF	Clark	85 min
Jul 21, 3:38 PM PDT	Severe Thunderstorm Warning	VEF	Lincoln	52 min

Nearby

Severe Thunderstorm Warnings in Nevada, 2013 Every severe thunderstorm warning in 2013

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.