Alert archive / Nevada / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 21, NWS Las Vegas, NV

July 20, 2018Clark County, Nevada

NWS Las Vegas, NV issued this severe thunderstorm warning at Jul 20, 2018, 6:54 PM PDT for Clark County, Nevada. It was in force for 51 min. 32 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, 2018, 6:54 PM PDT (01:54 UTC)
Expired
Jul 20, 2018, 7:45 PM PDT
In force
51 min
Issued by
NWS Las Vegas, NV
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Clark County, NV

The radar

The Las Vegas radar (KESX), 38 km from the middle of the area, began a volume at 01:55 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

TimeReportWhereRemark
Jul 20, 6:58 PM PDTTSTM WND DMG1 S Green Valley, NVCORRECTS PREVIOUS TSTM WND DMG REPORT FROM 1 S GREEN VALLEY. PUBLIC REPORT OF A CONCRETE SLAB PULLED UP BY AN UPROOTED TREE IN A GROCERY STORE PARKING LOT OFF OF GREEN VALLEY AND INTERSTATE 215.
Jul 20, 6:58 PM PDTTSTM WND DMG1 S Green Valley, NVPUBLIC TWITTER POST OF A CONCRETE SLAB PULLED UP BY AN UPROOTED TREE IN A GROCERY STORE PARKING LOT OFF OF GREEN VALLEY AND 215.
Jul 20, 6:58 PM PDTTSTM WND DMG1 Wsw Green Valley, NVCORRECTS PREVIOUS TSTM WND DMG REPORT FROM 1 WSW GREEN VALLEY. CORRECTS PREVIOUS TSTM WND DMG REPORT FROM 1 WSW GREEN VALLEY. PUBLIC REPORTED A LARGE TREE DOWN.
Jul 20, 6:58 PM PDTTSTM WND DMG1 Wsw Green Valley, NVCORRECTS PREVIOUS TSTM WND DMG REPORT FROM 1 WSW GREEN VALLEY. PUBLIC TWITTER REPORTED A LARGE TREE DOWN.
Jul 20, 6:58 PM PDTTSTM WND DMG2 Nnw Anthem, NVCORRECTS PREVIOUS TSTM WND DMG REPORT FROM 2 NNW ANTHEM. PUBLIC REPORT OF SIGNIFICANT DAMAGE TO LARGE SHOPPING CENTER SIGN.
Jul 20, 6:58 PM PDTTSTM WND DMG2 Ssw Green Valley, NVCORRECTS PREVIOUS TSTM WND DMG REPORT FROM 2 SSW GREEN VALLEY. GREEN VALLEY RANCH CASINO REPORTED MULTIPLE LARGE TREES DOWNED.
Jul 20, 6:58 PM PDTTSTM WND DMG3 Nne Henderson Executi, NVCORRECTS PREVIOUS TSTM WND DMG REPORT FROM 3 NNE HENDERSON EXECUTIVE AIRPORT. REPORT OF 15 TREES DOWN ALONG ST. ROSE PARKWAY AND EASTERN AVE. VEHICLE DAMAGE ALSO REPORTED. TIME ESTIMATED FROM RADAR.
Jul 20, 6:58 PM PDTTSTM WND DMG3 Nne Henderson Executi, NVMINIMUM OF 15 TREES DOWN ALONG ST. ROSE PARKWAY AND EASTERN AVE. VEHICLE DAMAGE ALSO REPORTED. TIME ESTIMATED FROM RADAR.
Jul 20, 6:59 PM PDTTSTM WND DMG2 S Green Valley, NVCORRECTS PREVIOUS TSTM WND DMG REPORT FROM 2 S GREEN VALLEY. PUBLIC REPORT MENTIONS AT LEAST 8 TREES UPROOTED.
Jul 20, 7:00 PM PDTTSTM WND GST 681 Nne Henderson Executi, NVWIND GUST REPORTED AT 68 MPH IN HENDERSON.
Jul 20, 7:01 PM PDTTSTM WND DMG2 S Green Valley, NVCORRECTS PREVIOUS TSTM WND DMG REPORT FROM 2 S GREEN VALLEY. HENDERSON PAVILION RECEIVED SIGNIFICANT WIND DAMAGE.
Jul 20, 7:02 PM PDTTSTM WND DMG3 Nne Henderson Executi, NVCORRECTS PREVIOUS TSTM WND DMG REPORT FROM 3 NNE HENDERSON EXECUTIVE AIRPORT. PUBLIC TWITTER REPORTED SIGNIFICANT VEHICLE DAMAGE.
Jul 20, 7:03 PM PDTTSTM WND DMG3 Nne Henderson Executi, NVCORRECTS PREVIOUS TSTM WND DMG REPORT FROM 3 NNE HENDERSON EXECUTIVE AIRPORT. PUBLIC TWEET REPORTED A DOWNED TREE CAUSING SIGNIFICANT VEHICLE DAMAGE.
Jul 20, 7:05 PM PDTTSTM WND DMG2 N Green Valley, NVNV ENERGY REPORTED 6 DOWNED POWER POLES BETWEEN GREEN VALLEY PARKWAY AND E SUNSET RD.
Jul 20, 7:07 PM PDTTSTM WND DMG2 Ne Green Valley, NVMEDIA REPORTED DOWNED POWER LINES ON W SUNSET RD. BETWEEN ARROYO GRANDE AND VALLE VERDE.
Jul 20, 7:08 PM PDTTSTM WND DMG3 Sw Green Valley, NVTREE DOWNED ON THE CORNER OF EASTERN AVE AND E SERENE AVE.
Jul 20, 7:08 PM PDTTSTM WND GST 711 Sse Green Valley, NVCORRECTS PREVIOUS TSTM WND GST REPORT FROM 1 SSE GREEN VALLEY. MESONET RECORDED A WIND GUST OF 71 MPH.
Jul 20, 7:08 PM PDTTSTM WND GST 711 Sse Green Valley, NVMESONET SITE RECORDED A WIND GUST OF 71 MPH.
Jul 20, 7:08 PM PDTTSTM WND GST 711 Sse Green Valley, NVVANDERBURG ELEMENTARY RECORDED A WIND GUST OF 71 MPH.
Jul 20, 7:09 PM PDTTSTM WND DMG2 Nne Henderson Executi, NVCORRECTS PREVIOUS TSTM WND DMG REPORT FROM 2 NNE HENDERSON EXECUTIVE AIRPORT. MULTIPLE TREES DOWNED NEAR SEVEN HILLS DRIVE AND W HORIZON RIDGE PKWY.
Jul 20, 7:13 PM PDTTSTM WND GST 611 Sse Green Valley, NVCORRECTS PREVIOUS TSTM WND GST REPORT FROM 1 SSE GREEN VALLEY. CORRECTS PREVIOUS TSTM WND GST REPORT FROM 1 SSE GREEN VALLEY. MESONET SITE REPORTED 61 MPH WIND GUSTS.
Jul 20, 7:14 PM PDTTSTM WND DMG3 Nne Henderson Executi, NVCORRECTS PREVIOUS TSTM WND DMG REPORT FROM 3 NNE HENDERSON EXECUTIVE AIRPORT. CORRECTS PREVIOUS TSTM WND DMG REPORT FROM 3 NNE HENDERSON EXECUTIVE AIRPORT. PUBLIC REPORTED SIGNIFICANT VEHICLE DAMAGE DUE TO DOWNED TREE.
Jul 20, 7:15 PM PDTTSTM WND DMG2 S Green Valley, NVCORRECTS PREVIOUS TSTM WND DMG REPORT FROM 2 S GREEN VALLEY. CORRECTS PREVIOUS TSTM WND DMG REPORT FROM 2 S GREEN VALLEY. HENDERSON PAVILION RECEIVED SIGNIFICANT WIND DAMAGE.
Jul 20, 7:15 PM PDTTSTM WND DMG2 Wsw Green Valley, NVCORRECTS PREVIOUS TSTM WND DMG REPORT FROM 2 WSW GREEN VALLEY. MEDIA REPORTED A DOWNED TREE IN PEBBLE PARK. TIME INDICATED FROM RADAR.
Jul 20, 7:16 PM PDTTSTM WND DMG3 Ne Henderson Executiv, NVCORRECTS PREVIOUS TSTM WND DMG REPORT FROM 3 NE HENDERSON EXECUTIVE AIRPORT. TREE DOWNED AND DAMAGE TO GARAGE DOOR REPORTED ON S EASTERN AVE AND CORONADO CENTER DR.
Jul 20, 7:16 PM PDTTSTM WND DMG3 Nne Henderson Executi, NVCORRECTS PREVIOUS TSTM WND DMG REPORT FROM 3 NNE HENDERSON EXECUTIVE AIRPORT. CORRECTS PREVIOUS TSTM WND DMG REPORT FROM 3 NNE HENDERSON EXECUTIVE AIRPORT. PUBLIC REPORTED A DOWNED TREE CAUSING SIGNIFICANT VEHICLE DAMAGE.
Jul 20, 7:18 PM PDTTSTM WND DMG1 S Anthem, NVCORRECTS PREVIOUS TSTM WND DMG REPORT FROM 1 S ANTHEM. PUBLIC REPORTED MULTIPLE TREES DOWNED IN SUN CITY ANTHEM.
Jul 20, 7:19 PM PDTTSTM WND GST 611 Sse Green Valley, NVCORRECTS PREVIOUS TSTM WND GST REPORT FROM 1 SSE GREEN VALLEY. MESONET SITE REPORTED 61 MPH WIND GUSTS.
Jul 20, 7:19 PM PDTTSTM WND GST 611 Sse Green Valley, NVMESONET SITE REPORTED 61 MPH WIND GUSTS.
Jul 20, 7:19 PM PDTTSTM WND GST 611 Sse Green Valley, NVTWITCHELL ELEMENTARY SCHOOL REPORTED 61 MPH WIND GUSTS.
Jul 20, 7:20 PM PDTTSTM WND DMG3 Ne Henderson Executiv, NVTREE DOWNED AND DAMAGE TO GARAGE DOOR REPORTED ON S EASTERN AVE AND CORONADO CENTER DR.
Jul 20, 7:20 PM PDTTSTM WND DMG3 Nne Henderson Executi, NVCORRECTS PREVIOUS TSTM WND DMG REPORT FROM 3 NNE HENDERSON EXECUTIVE AIRPORT. PUBLIC REPORT OF TREE DOWNED AND BLOCKING TWO RIGHT LANES OF S EASTERN BLVD.

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, 1.9 hours before the alert went out and 58 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-pSkew-T log-p diagram, Las Vegas, NV at 00:00Z on 2018-07-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1115 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Las Vegas, NV at 00:00Z on 2018-07-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -4 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
1115 J/kg
Mixed-layer CIN
-47 J/kg
Mixed-layer LCL
2787 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
-4 m²/s²
0-3 km storm-relative helicity
9 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

750 
WUUS55 KVEF 210154
SVRVEF
NVC003-210245-
/O.NEW.KVEF.SV.W.0021.180721T0154Z-180721T0245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Las Vegas NV
654 PM PDT FRI JUL 20 2018

The National Weather Service in Las Vegas has issued a

* Severe Thunderstorm Warning for...
  Central Clark County in southern Nevada...

* Until 745 PM PDT.

* At 654 PM PDT, a severe thunderstorm was located over Seven Hills,
  or over Anthem, moving north at 15 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs and trees.

* Locations impacted include...
  Las Vegas, Henderson, North Las Vegas, Anthem, The Strip, Downtown
  Las Vegas, East Las Vegas, Sam Boyd Stadium, Southern Highlands,
  Spring Valley, Green Valley, Enterprise, Paradise, Lake Las Vegas,
  Mountains Edge, Nellis AFB, Summerlin, Lone Mountain, Sloan and
  Seven Hills.

This includes Interstate 15 in Nevada between mile markers 21 and 25.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3586 11499 3586 11524 3623 11529 3623 11489
TIME...MOT...LOC 0154Z 184DEG 12KT 3600 11512 

HAIL...1.00IN
WIND...60MPH
 
$$

Outler
3 follow-up statements
253 
WWUS55 KVEF 210159
SVSVEF

Severe Weather Statement
National Weather Service Las Vegas NV
659 PM PDT FRI JUL 20 2018

NVC003-210245-
/O.CON.KVEF.SV.W.0021.000000T0000Z-180721T0245Z/
Clark NV-
659 PM PDT FRI JUL 20 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM PDT
FOR CENTRAL CLARK COUNTY...

At 658 PM PDT, a severe thunderstorm was located over Silverado 
Ranch, or over Green Valley, moving north at 15 mph.  Wind gusts in 
excess of 65 mph have been recorded with this storm.

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
Las Vegas, Henderson, North Las Vegas, Anthem, The Strip, Downtown
Las Vegas, East Las Vegas, Sam Boyd Stadium, Southern Highlands,
Spring Valley, Green Valley, Enterprise, Paradise, Lake Las Vegas,
Mountains Edge, Nellis AFB, Summerlin, Lone Mountain, Sloan and Seven
Hills.

This includes Interstate 15 in Nevada between mile markers 21 and 25.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3586 11499 3586 11524 3623 11529 3623 11489
TIME...MOT...LOC 0158Z 184DEG 12KT 3602 11512 

HAIL...1.00IN
WIND...70MPH
 
$$

Outler
801 
WWUS55 KVEF 210217
SVSVEF

Severe Weather Statement
National Weather Service Las Vegas NV
717 PM PDT FRI JUL 20 2018

NVC003-210245-
/O.CON.KVEF.SV.W.0021.000000T0000Z-180721T0245Z/
Clark NV-
717 PM PDT FRI JUL 20 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM PDT
FOR CENTRAL CLARK COUNTY...

At 716 PM PDT, a severe thunderstorm was located near Paradise, 
moving north at 15 mph.  Significant wind damage including uprooted 
trees and snapped power lines has been reported with this storm in 
Green Valley.

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
Las Vegas, Henderson, North Las Vegas, Anthem, The Strip, Downtown
Las Vegas, East Las Vegas, Sam Boyd Stadium, Southern Highlands,
Spring Valley, Green Valley, Enterprise, Paradise, Lake Las Vegas,
Mountains Edge, Nellis AFB, Summerlin, Lone Mountain, Sloan and Seven
Hills.

This includes Interstate 15 in Nevada between mile markers 21 and 25.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3586 11499 3586 11524 3623 11529 3623 11489
TIME...MOT...LOC 0216Z 185DEG 13KT 3610 11510 

HAIL...1.00IN
WIND...70MPH
 
$$

Outler
884 
WWUS55 KVEF 210235
SVSVEF

Severe Weather Statement
National Weather Service Las Vegas NV
735 PM PDT FRI JUL 20 2018

NVC003-210245-
/O.EXP.KVEF.SV.W.0021.000000T0000Z-180721T0245Z/
Clark NV-
735 PM PDT FRI JUL 20 2018

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL CLARK COUNTY WILL
EXPIRE AT 745 PM PDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  Beware of heavy 
rain and lightning for the next hour as the storm moves north. 

LAT...LON 3586 11499 3586 11524 3623 11529 3623 11489
TIME...MOT...LOC 0235Z 184DEG 12KT 3616 11510 

$$

Outler

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 20, 7:05 PM PDTFlash Flood WarningVEFClark3 hr
Jul 20, 8:54 PM PDTSevere Thunderstorm WarningVEFNye51 min
Jul 21, 9:22 AM PDTSevere Thunderstorm WarningVEFClark53 min
Jul 21, 9:41 AM PDTSevere Thunderstorm WarningVEFClark79 min
Jul 21, 10:28 AM PDTDust Storm WarningVEFClark62 min
Jul 21, 12:36 PM PDTAreal Flood AdvisoryVEFLincoln3 hr
Jul 21, 2:28 PM PDTSevere Thunderstorm WarningVEFClark62 min

Nearby

Severe Thunderstorm Warnings in Nevada, 2018Every severe thunderstorm warning in 2018

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.