Alert archive / California / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 3, NWS Las Vegas, NV

July 14, 2012San Bernardino County, California

NWS Las Vegas, NV issued this severe thunderstorm warning at Jul 14, 2012, 1:42 PM PDT for San Bernardino County, California. It was in force for 21 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
Jul 14, 2012, 1:42 PM PDT (20:42 UTC)
Expired
Jul 14, 2012, 2:03 PM PDT
In force
21 min
Issued by
NWS Las Vegas, NV
Area
Storm-based polygon

County San Bernardino County, CA

The radar

The Las Vegas radar (KESX), 69 km from the middle of the area, began a volume at 20:42 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, 8.7 hours before the alert went out and 80 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 2012-07-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 372 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 12:00Z on 2012-07-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 27 square meters per square second.193958Sfc1 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
372 J/kg
Mixed-layer CIN
-151 J/kg
Mixed-layer LCL
1206 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
27 m²/s²
0-3 km storm-relative helicity
20 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

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

023 
WUUS55 KVEF 142042
SVRVEF
CAC071-142115-
/O.NEW.KVEF.SV.W.0003.120714T2042Z-120714T2115Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
142 PM PDT SAT JUL 14 2012

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 215 PM PDT.

* AT 140 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED OVER NORTH CENTRAL SAN
  BERNARDINO COUNTY...OR 16 MILES WEST OF PRIMM...AND WAS MOVING
  NORTH AT 10 MPH.

* LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF NORTHERN SAN BERNARDINO COUNTY.

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 BY USING THE TWITTER
HASHTAG...NWSVEGAS.

&&

LAT...LON 3581 11565 3562 11542 3547 11569 3560 11584
TIME...MOT...LOC 2042Z 196DEG 7KT 3563 11568

$$

STACHELSKI
1 follow-up statement
287 
WWUS55 KVEF 142103
SVSVEF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
203 PM PDT SAT JUL 14 2012

CAC071-142111-
/O.CAN.KVEF.SV.W.0003.000000T0000Z-120714T2115Z/
SAN BERNARDINO CA-
203 PM PDT SAT JUL 14 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL SAN BERNARDINO
COUNTY IS CANCELLED...

RADAR SHOWS THE THUNDERSTORM OVER NORTH CENTRAL SAN BERNARDINO 
COUNTY NEAR THE CLARK MOUNTAINS HAS WEAKENED TO BELOW SEVERE LIMITS. 
THEREFORE THE SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED.

LAT...LON 3581 11565 3562 11542 3547 11569 3560 11584
TIME...MOT...LOC 2101Z 196DEG 7KT 3567 11567

$$

STACHELSKI

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 13, 5:35 PM PDTFlash Flood WarningVEFSan Bernardino115 min
Jul 13, 5:55 PM PDTFlash Flood WarningVEFInyo2 hr
Jul 13, 6:00 PM PDTFlash Flood WarningVEFSan Bernardino2 hr
Jul 13, 7:20 PM PDTFlash Flood WarningVEFSan Bernardino115 min
Jul 13, 8:00 PM PDTFlash Flood WarningVEFSan Bernardino61 min
Jul 13, 8:50 PM PDTFlash Flood WarningVEFSan Bernardino115 min
Jul 13, 9:39 PM PDTFlash Flood WarningVEFSan Bernardino81 min
Jul 13, 11:46 PM PDTFlash Flood WarningVEFSan Bernardino97 min
Jul 14, 12:19 AM PDTFlash Flood WarningVEFInyo86 min
Jul 14, 1:09 PM PDTAreal Flood AdvisoryVEFSan Bernardino35 min
Jul 14, 1:19 PM PDTFlash Flood WarningVEFSan Bernardino3 min
Jul 14, 1:34 PM PDTAreal Flood AdvisoryVEFSan Bernardino3 hr
Jul 14, 1:36 PM PDTFlash Flood WarningVEFSan Bernardino114 min
Jul 14, 4:22 PM PDTSevere Thunderstorm WarningVEFSan Bernardino38 min
Jul 14, 4:29 PM PDTAreal Flood AdvisoryVEFSan Bernardino2 hr
Jul 14, 4:33 PM PDTFlash Flood WarningVEFSan Bernardino117 min
Jul 14, 4:38 PM PDTFlash Flood WarningVEFSan Bernardino3 hr

Nearby

Severe Thunderstorm Warnings in California, 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.