Alert archive / California / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 4, NWS Las Vegas, NV
NWS Las Vegas, NV issued this severe thunderstorm warning at Jul 12, 2002, 5:33 PM PDT for San Bernardino County, California; Clark County, Nevada. It was in force for 87 min. 1 report 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 12, 2002, 5:33 PM PDT (00:33 UTC)
- Expired
- Jul 12, 2002, 7:00 PM PDT
- In force
- 87 min
- Issued by
- NWS Las Vegas, NV
- Area
- Counties, with a storm outline in the text
Counties San Bernardino County, CA, Clark County, NV
The radar
The Las Vegas radar (KESX), 55 km from the middle of the area, began a volume at 00:36 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
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 12, 6:15 PM PDT | Thunderstorm Wind 60 M | Henderson, NV | Winds of 69 mph were measured at the Henderson Executive Airport. |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 12, 4:30 PM PDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Mercury/Desert R, NV (KDRA), launched 00:00Z, 0.6 hours before the alert went out and 91 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.
- Mixed-layer CAPE
- 385 J/kg
- Mixed-layer CIN
- -129 J/kg
- Mixed-layer LCL
- 3732 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 12 m²/s²
- 0-3 km storm-relative helicity
- 78 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.2
The text
As transmitted, in the capitals the NWS used until 2016.
450
WUUS55 KVEF 130033
SVRVEF
CAC071-NVC003-130200-
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
526 PM PDT FRI JUL 12 2002
THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
NORTH CENTRAL SAN BERNARDINO COUNTY IN SOUTHEAST CALIFORNIA
THIS INCLUDES THE FOLLOWING LOCATIONS...NIPTON...MOUNTAIN
PASS
CENTRAL CLARK COUNTY IN SOUTHERN NEVADA
THIS INCLUDES THE FOLLOWING LOCATIONS...LAS VEGAS
SLOAN...RED ROCK CANYON...PRIMM...OVERTON BEACH...OVERTON...NORTH
LAS VEGAS...JEAN...INDIAN SPRINGS...HENDERSON...BOULDER CITY
* UNTIL 700 PM PDT(700 PM MST)
* AT 530 PM PDT(530 PM MST)...NATIONAL WEATHER SERVICE DOPPLER
RADAR INDICATED A SEVERE THUNDERSTORMS WITH STRONG DAMAGING
WINDS MOVING NORTHWEST INTO THE WARNING AREA.
THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH YOU SHOULD PREPARE
FOR DAMAGING WINDS IN EXCESS OF 60 MPH...AND DEADLY LIGHTNING.
PEOPLE OUTSIDE SHOULD MOVE TO SHELTER...PREFERABLY INSIDE A STRONG
BUILDING BUT AWAY FROM WINDOWS.
LAT...LON 3627 11574 3580 11560 3511 11582 3501 11516
3530 11514 3658 11426 3668 11561 3653 11572
PIERCEThe office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 12, 5:08 PM PDT | Severe Thunderstorm Warning | VEF | Clark | 57 min |
Nearby
Severe Thunderstorm Warnings in California, 2002Severe Thunderstorm Warnings in Nevada, 2002Every severe thunderstorm warning in 2002
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.