Alert archive / California / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 13, NWS Las Vegas, NV

July 16, 2009San Bernardino County, California; Clark County, Nevada

NWS Las Vegas, NV issued this severe thunderstorm warning at Jul 16, 2009, 5:11 PM PDT for San Bernardino County, California; Clark County, Nevada. It was in force for 49 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 16, 2009, 5:11 PM PDT (00:11 UTC)
Expired: Jul 16, 2009, 6:00 PM PDT
In force: 49 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), 57 km from the middle of the area, began a volume at 00:12 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

Mercury/Desert R, NV (KDRA), launched 00:00Z, 0.2 hours before the alert went out and 191 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 5917 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: -17 m²/s²
0-3 km storm-relative helicity: 25 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.

000 
WUUS55 KVEF 170011
SVRVEF
CAC071-NVC003-170100-
/O.NEW.KVEF.SV.W.0013.090717T0011Z-090717T0100Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
511 PM PDT THU JUL 16 2009

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 600 PM PDT.

* AT 507 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
  A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL. 
  THIS STORM WAS LOCATED 8 MILES SOUTH OF CAL NEV ARI...OR 14 
  MILES WEST OF LAUGHLIN...AND MOVING NORTHWEST AT 5 MPH.

* LOCATIONS IMPACTED INCLUDE...HIGHWAY 95 SOUTH OF CAL NEV ARI TO 
  MILE MARKER 70 IN CALIFORNIA...AND HIGHWAY 163. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

&&

LAT...LON 3520 11497 3531 11485 3520 11465 3503 11475
TIME...MOT...LOC 0008Z 123DEG 3KT 3519 11482

$$

ASG

2 follow-up statements

000 
WWUS55 KVEF 170036
SVSVEF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
536 PM PDT THU JUL 16 2009

CAC071-NVC003-170100-
/O.CON.KVEF.SV.W.0013.000000T0000Z-090717T0100Z/
SAN BERNARDINO CA-CLARK NV-
536 PM PDT THU JUL 16 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM PDT
FOR EXTREME SOUTH CENTRAL CLARK AND EAST CENTRAL SAN BERNARDINO
COUNTIES...

AT 533 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE 
HAIL.  THIS STORM WAS LOCATED 10 MILES SOUTH OF CAL NEV ARI...OR 15 
MILES WEST OF LAUGHLIN...MOVING SOUTH AT 5 MPH. 

THE SEVERE THUNDERSTORM WILL MAINLY AFFECT HIGHWAY 95 SOUTH OF CAL 
NEV ARI TO MILE MARKER 70 IN CALIFORNIA...AND HIGHWAY 163. 

LAT...LON 3520 11497 3531 11485 3520 11465 3503 11475
TIME...MOT...LOC 0033Z 123DEG 3KT 3520 11484

$$

ASG

000 
WWUS55 KVEF 170054
SVSVEF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
554 PM PDT THU JUL 16 2009

CAC071-NVC003-170101-
/O.EXP.KVEF.SV.W.0013.000000T0000Z-090717T0100Z/
SAN BERNARDINO CA-CLARK NV-
554 PM PDT THU JUL 16 2009

...THE SEVERE THUNDERSTORM WARNING FOR EXTREME SOUTH CENTRAL CLARK
AND EAST CENTRAL SAN BERNARDINO COUNTIES WILL EXPIRE AT 600 PM PDT...

DOPPLER RADAR HAS INDICATED THAT THUNDERSTORMS OVER THE WARNED AREA 
HAVE MOVED SOUTH AND WEAKENED. THEREFORE THE SEVERE THUNDERSTORM 
WARNING HAS BEEN ALLOWED TO EXPIRE.

LAT...LON 3520 11497 3531 11485 3520 11465 3503 11475
TIME...MOT...LOC 0051Z 123DEG 3KT 3521 11486

$$

ASG

Nearby

Severe Thunderstorm Warnings in California, 2009 Severe Thunderstorm Warnings in Nevada, 2009 Every severe thunderstorm warning in 2009

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.