Alert archive / California / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 62, NWS Las Vegas, NV

October 11, 2012San Bernardino County, California; Clark County, Nevada

NWS Las Vegas, NV issued this severe thunderstorm warning at Oct 11, 2012, 1:51 PM PDT for San Bernardino County, California; Clark County, Nevada. It was in force for 24 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Oct 11, 2012, 1:51 PM PDT (20:51 UTC)
Expired
Oct 11, 2012, 2:15 PM PDT
In force
24 min
Issued by
NWS Las Vegas, NV
Area
Storm-based polygon

Counties San Bernardino County, CA, Clark County, NV

The radar

The Las Vegas radar (KESX), 53 km from the middle of the area, began a volume at 20:52 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 12:00Z, 8.9 hours before the alert went out and 95 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 12:00Z on 2012-10-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 327 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Las Vegas, NV at 12:00Z on 2012-10-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 146 square meters per square second.1939587897Sfc1 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
327 J/kg
Mixed-layer CIN
-89 J/kg
Mixed-layer LCL
958 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
146 m²/s²
0-3 km storm-relative helicity
316 m²/s²
Significant tornado parameter
0.3
Supercell composite
3.9

Open this sounding in Storm Lab

The text

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

436 
WUUS55 KVEF 112051
SVRVEF
CAC071-NVC003-112115-
/O.NEW.KVEF.SV.W.0062.121011T2051Z-121011T2115Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
151 PM PDT THU OCT 11 2012

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTH CENTRAL SAN BERNARDINO COUNTY IN SOUTHERN CALIFORNIA...
  SOUTH CENTRAL CLARK COUNTY IN SOUTHERN NEVADA...

* UNTIL 215 PM PDT.

* AT 148 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  NIPTON...OR 17 MILES NORTHEAST OF CIMA...AND WAS MOVING NORTHWEST
  AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  NIPTON AND PRIMM.

THIS INCLUDES INTERSTATE 15 IN CALIFORNIA BETWEEN MILE MARKERS 174
AND 186.

THIS INCLUDES INTERSTATE 15 IN NEVADA BETWEEN MILE MARKERS 1 AND 5.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM IS CAPABLE OF PRODUCING LARGE HAIL THAT CAN CAUSE INJURY
AND DAMAGE PROPERTY. IN ADDITION...STRONG WINDS AND LIGHTNING ARE
LIKELY. LIGHTNING CAN KILL! TAKE SHELTER IN A STURDY BUILDING. IF IT
IS SAFE TO DO SO...TAKE APPROPRIATE ACTIONS TO PROTECT VEHICLES AND
PROPERTY.

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

&&

LAT...LON 3559 11564 3573 11542 3541 11515 3531 11533
TIME...MOT...LOC 2051Z 142DEG 26KT 3541 11528

$$

MORGAN
1 follow-up statement
942 
WWUS55 KVEF 112109
SVSVEF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
209 PM PDT THU OCT 11 2012

CAC071-NVC003-112118-
/O.EXP.KVEF.SV.W.0062.000000T0000Z-121011T2115Z/
SAN BERNARDINO CA-CLARK NV-
209 PM PDT THU OCT 11 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL CLARK AND NORTH
CENTRAL SAN BERNARDINO COUNTIES WILL EXPIRE AT 215 PM PDT...

AT 208 PM PDT...RADAR SHOWED THAT THE THUNDERSTORM JUST NORTH OF 
NIPTON HAD BEGUN TO WEAKEN. NO REPORTS OF LARGE HAIL OR HIGH WINDS 
HAD BEEN RECEIVED...SO THE SEVERE THUNDERSTORM WARNING WILL BE 
ALLOWED TO EXPIRE.

LAT...LON 3559 11564 3573 11542 3541 11515 3531 11533
TIME...MOT...LOC 2108Z 142DEG 26KT 3551 11537

$$

MORGAN

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 11, 8:39 AM PDTFlash Flood WarningVEFSan Bernardino111 min
Oct 11, 11:48 AM PDTAreal Flood AdvisoryVEFSan Bernardino2 hr
Oct 11, 4:18 PM PDTSevere Thunderstorm WarningVEFInyo, San Bernardino27 min
Oct 11, 1:39 AM PDTAreal Flood AdvisoryVEFClark81 min
Oct 11, 8:22 AM PDTAreal Flood AdvisoryVEFClark7 hr
Oct 11, 2:53 PM PDTFlash Flood WarningVEFClark39 min
Oct 11, 4:53 PM PDTFlash Flood WarningVEFClark112 min

Nearby

Severe Thunderstorm Warnings in California, 2012Severe Thunderstorm Warnings in Nevada, 2012Every severe thunderstorm 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.