Alert archive / California / Tornado Warnings in 1998
Tornado Warning 1, NWS Las Vegas, NV
NWS Las Vegas, NV issued this tornado warning at Aug 25, 1998, 11:33 AM PDT for San Bernardino County, California. It was in force for 62 min. 2 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Aug 25, 1998, 11:33 AM PDT (18:33 UTC)
- Expired
- Aug 25, 1998, 12:35 PM PDT
- In force
- 62 min
- Issued by
- NWS Las Vegas, NV
- Area
- Whole counties
County San Bernardino County, CA
The radar
The Edwards AFB radar (KEYX), 129 km from the middle of the area, began a volume at 18:32 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 |
|---|---|---|---|
| Aug 25, 12:20 PM PDT | Tornado F0 | Nipton, CA | |
| Aug 25, 12:30 PM PDT | Thunderstorm Wind | Nipton, CA |
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 nearest sounding before it
Mercury/Desert R, NV (KDRA), launched 12:00Z, 6.6 hours before the alert went out and 198 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
- 230 J/kg
- Mixed-layer CIN
- -111 J/kg
- Mixed-layer LCL
- 2446 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 95 m²/s²
- 0-3 km storm-relative helicity
- 53 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
655 WFUS1 KLAS 251835 RRA TORLAS CAC071-251935- BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE LAS VEGAS NV 1133 AM PDT TUE AUG 25 1998 * TORNADO WARNING FOR NORTHEASTERN SAN BERNARDINO COUNTY IN SOUTHEASTERN CALIFORNIA * UNTIL 1235 PM PDT * SOME LOCATIONS IN THE WARNED AREA INCLUDE: INTERSTATE 15 EAST NEAR NIPTON ROAD WHEATON SPRINGS (AT INTERSECTION OF NIPTON ROAD) * AT 1130 AM PDT...RADAR DETECTED A POSSIBLE TORNADO ASSOCIATED WITH A STORM LOCATED NEAR THE INTERSECTION OF INTERSTATE 15 AND NIPTON ROAD. MOVEMENT WAS TO THE NORTHEAST AT 5 MPH. ALTHOUGH THIS STORM MAY NOT BE PRODUCING A TORNADO AT THE MOMENT... IT LIKELY WILL SOMETIME DURING THE WARNING PERIOD. IN ADDITION...THIS STORM IS LIKELY PRODUCING LARGE DAMAGING HAIL...STRONG WINDS IN EXCESS OF 60 MPH AND VERY HEAVY RAIN. DO NOT USE YOUR CAR TO OUTRUN A TORNADO. CARS ARE EASILY TOSSED AROUND BY TORNADIC WINDS. IF YOU ARE CAUGHT IN THE PATH OF A TORNADO... LEAVE THE CAR AND GO TO A STRONG BUILDING. IF NO STRUCTURE IS NEARBY...SEEK SAFETY IN A DITCH OR LOW SPOT. BE MINDFUL OF RISING WATERS. SKRBAC
The office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 25, 11:57 AM PDT | Flash Flood Warning | VEF | San Bernardino | 2 hr |
| Aug 25, 2:02 PM PDT | Flash Flood Warning | VEF | San Bernardino | 118 min |
Nearby
Tornado Warnings in California, 1998Every tornado warning in 1998Tornadoes in 1998
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.