Alert archive / California / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 4, NWS Las Vegas, NV

July 14, 2012San Bernardino County, California

NWS Las Vegas, NV issued this severe thunderstorm warning at Jul 14, 2012, 4:22 PM PDT for San Bernardino County, California. It was in force for 38 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, 4:22 PM PDT (23:22 UTC)
Expired
Jul 14, 2012, 5:00 PM PDT
In force
38 min
Issued by
NWS Las Vegas, NV
Area
Storm-based polygon

County San Bernardino County, CA

The nearest sounding before it

Las Vegas, NV (KVEF), launched 12:00Z, 11.4 hours before the alert went out and 200 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.

279 
WUUS55 KVEF 142322
SVRVEF
CAC071-150000-
/O.NEW.KVEF.SV.W.0004.120714T2322Z-120715T0000Z/

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

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 500 PM PDT.

* AT 418 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DESTRUCTIVE WINDS IN
  EXCESS OF 70 MPH.  THIS STORM WAS LOCATED NEAR NEWBERRY MOUNTAIN RV
  PARK...OR 17 MILES EAST OF DAGGETT...AND WAS MOVING EAST AT 5 MPH.

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

THIS INCLUDES INTERSTATE 40 BETWEEN MILE MARKERS 19 AND 37.

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. HEAVY RAIN IS ALSO EXPECTED WITH THIS STORM.

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 3469 11648 3473 11642 3475 11665 3476 11671
      3493 11671 3492 11639 3468 11638
TIME...MOT...LOC 2322Z 270DEG 4KT 3480 11659

$$

JH
2 follow-up statements
005 
WWUS55 KVEF 142343
SVSVEF

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

CAC071-150000-
/O.CON.KVEF.SV.W.0004.000000T0000Z-120715T0000Z/
SAN BERNARDINO CA-
443 PM PDT SAT JUL 14 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM PDT
FOR CENTRAL SAN BERNARDINO COUNTY...

AT 442 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DESTRUCTIVE WINDS
IN EXCESS OF 70 MPH.  THIS STORM WAS LOCATED NEAR NEWBERRY MOUNTAIN
RV PARK...OR 19 MILES EAST OF DAGGETT...AND WAS MOVING EAST AT 5 MPH.

LOCATIONS IMPACTED INCLUDE...
MAINLY RURAL AREAS OF CENTRAL SAN BERNARDINO COUNTY.

THIS INCLUDES INTERSTATE 40 BETWEEN MILE MARKERS 19 AND 37.

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 3469 11648 3473 11642 3475 11665 3476 11671
      3493 11671 3492 11639 3468 11638
TIME...MOT...LOC 2343Z 270DEG 4KT 3480 11656

$$

JH
810 
WWUS55 KVEF 142354
SVSVEF

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

CAC071-150003-
/O.EXP.KVEF.SV.W.0004.000000T0000Z-120715T0000Z/
SAN BERNARDINO CA-
454 PM PDT SAT JUL 14 2012

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL SAN BERNARDINO COUNTY
WILL EXPIRE AT 500 PM PDT...

THIS INCLUDES INTERSTATE 40 BETWEEN MILE MARKERS 19 AND 37. A FLASH 
FLOOD WARNING IS STILL IN EFFECT FOR ROUGHLY THE SAME AREA UNTIL 630 
PM.

LAT...LON 3469 11648 3473 11642 3475 11665 3476 11671
      3493 11671 3492 11639 3468 11638
TIME...MOT...LOC 2353Z 270DEG 4KT 3480 11655

$$

JH

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, 1:42 PM PDTSevere Thunderstorm WarningVEFSan Bernardino21 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.