Alert archive / Arizona / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 49, NWS Las Vegas, NV
NWS Las Vegas, NV issued this severe thunderstorm warning at Sep 11, 1998, 2:30 PM MST for Mohave County, Arizona; Clark County, Nevada. It was in force for 105 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
- Sep 11, 1998, 2:30 PM MST (21:30 UTC)
- Expired
- Sep 11, 1998, 4:15 PM MST
- In force
- 105 min
- Issued by
- NWS Las Vegas, NV
- Area
- Whole counties
Counties Mohave County, AZ, Clark County, NV
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 11, 2:30 PM MST | Hail 0.75 | Las Vegas, NV | |
| Sep 11, 3:35 PM MST | Hail 0.75 | Kingman, AZ |
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 |
|---|---|---|---|
| Sep 11, 12:15 PM MST | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Mercury/Desert R, NV (KDRA), launched 12:00Z, 9.5 hours before the alert went out and 162 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
- 490 J/kg
- Mixed-layer CIN
- -125 J/kg
- Mixed-layer LCL
- 1829 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 29 m²/s²
- 0-3 km storm-relative helicity
- 141 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.7
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Las Vegas, NV wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 11, 1:55 PM MST, 35 minutes earlier.
Area forecast discussion, Sep 11, 1:55 PM MST, 35 minutes before
MOJAVE DESERT/SOUTHERN GREAT BASIN AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE LAS VEGAS NV 155 PM PDT FRI SEP 11 1998 SYNOPSIS...AN AREA OF LOW PRESSURE OVER WESTERN NEVADA WILL SLOWLY MOVE SOUTHWARD INTO SOUTH CENTRAL CALIFORNIA TONIGHT. THE UPPER LOW WILL WEAKEN AND LIFT NORTHEAST INTO NORTHERN UTAH SATURDAY. A MOIST AND UNSTABLE AIRMASS WILL ENCOMPASS PARTS OF THE SOUTHERN GREAT BASIN AND MOJAVE DESERT TONIGHT FOR A CONTINUED THREAT OF SHOWERS AND THUNDERSTORMS THROUGH SATURDAY. DISCUSSION...VERY ACTIVE THIS AFTERNOON WITH NUMEROUS SEVERE AND FLASH FLOODING REPORTS IN LAS VEGAS AREA. WATER VAPOR IMAGERY INDICATING UPPER LOW SOUTH OF RENO WITH VERY DISTINCT DRY AREA ROTATING AROUND INTO SOUTHERN NEVADA AND NORTHWEST ARIZONA. WILL CONTINUE WITH SEVERE THUNDERSTORM WATCH UNTIL 6 PM AND FLASH FLOOD WATCH UNTIL 9 PM. IN ADDITION TO COUNTIES ALREADY WILL ADD CLARK COUNTY. DIDNT HAVE MUCH CHANCE TO LOOK AT NEW MODEL DATA BUT BASED ON SATELLITE TRENDS WILL CONTINUE WORDING OF PREVIOUS FORECAST. LAS +000. KOSIER
In the hours before
Special weather statement, Sep 11, 8:55 AM MST, 5 hours 35 minutes before
AZZ001-NVZ013>015-120500- BULLETIN...IMMEDIATE BROADCAST REQUESTED FLASH FLOOD WATCH...RESENT FOR CARSON NHP... NATIONAL WEATHER SERVICE LAS VEGAS NV 850 AM PDT (850 AM MST) FRI SEP 11 1998 ...FLASH FLOOD WATCH FROM 9 AM UNTIL 9 PM PDT/MST FOR NORTHERN MOHAVE COUNTY IN ARIZONA...AND NORTHERN AND CENTRAL NYE...ESMERALDA AND LINCOLN COUNTIES IN NEVADA. SOME LOCATIONS IN THE FLASH FLOOD WATCH INCLUDE...CALIENTE...PIOCHE...TONOPAH...GOLDFIELD...AND BEATTY IN NEVADA AND COLORADO CITY AND LITTLEFIELD IN ARIZONA. SHOWERS AND THUNDERSTORMS HAVE DEVELOPED THIS MORNING OVER NORTHWEST ARIZONA AND CENTRAL NEVADA AND WILL CONTINUE THROUGH THE AFTERNOON AND ARE EXPECTED TO BECOME WIDESPREAD IN MANY AREAS BY MID AFTERNOON. SOME OF THE THUNDERSTORMS COULD PRODUCE HEAVY RAIN OF BETWEEN ONE AND TWO INCHES IN LESS THAN ONE HOUR. RAINFALL OF THIS INTENSITY WOULD CAUSE FLASH FLOODING OF WASHES...CANYONS...AND OTHER LOW-LYING OR URBANIZED AREAS. AREAS THAT HAVE RECEIVED RAIN OVER THE PAST FEW DAYS WILL BE ESPECIALLY PRONE TO FLASH FLOODING AS THE SOIL MAY BE SATURATED. A FLASH FLOOD WATCH MEANS THERE IS THE POTENTIAL FOR FLASH FLOODING IN AND CLOSE TO THE WATCH AREA. BE READY TO TAKE QUICK ACTION IF FLASH FLOODING IS OBSERVED OR A WARNING IS ISSUED FOR YOUR AREA. DO NOT BECOME A VICTIM BY ATTEMPTING TO DRIVE OR WADE THROUGH RUNNING WATER YOU COULD BECOME STRANDED OR THE FORCE OF THE CURRENT COULD SWEEP YOU OR YOUR VEHICLE AWAY. LISTEN FOR ADDITIONAL UPDATES OR POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE. KOSIER
The office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 11, 5:50 AM MST | Severe Thunderstorm Warning | VEF | Mohave | 60 min |
| Sep 11, 11:42 AM MST | Flash Flood Warning | VEF | Mohave | 2 hr |
| Sep 11, 3:43 PM MST | Flash Flood Warning | VEF | Mohave | 4 hr |
| Sep 11, 4:28 PM MST | Severe Thunderstorm Warning | VEF | Mohave | 92 min |
| Sep 11, 11:23 AM MST | Severe Thunderstorm Warning | VEF | Clark | 62 min |
| Sep 11, 11:43 AM MST | Severe Thunderstorm Warning | VEF | Clark | 62 min |
| Sep 11, 12:04 PM MST | Flash Flood Warning | VEF | Lincoln | 2 hr |
| Sep 11, 12:08 PM MST | Flash Flood Warning | VEF | Clark | 2 hr |
| Sep 11, 12:28 PM MST | Tornado Warning | VEF | Clark | 47 min |
| Sep 11, 1:06 PM MST | Flash Flood Warning | VEF | Lincoln | 3 hr |
| Sep 11, 1:15 PM MST | Severe Thunderstorm Warning | VEF | Clark | 60 min |
| Sep 11, 2:07 PM MST | Flash Flood Warning | VEF | Clark | 6 hr |
| Sep 11, 4:04 PM MST | Flash Flood Warning | VEF | Lincoln | 116 min |
Nearby
Severe Thunderstorm Warnings in Arizona, 1998Severe Thunderstorm Warnings in Nevada, 1998Every severe thunderstorm warning 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.