Alert archive / Arizona / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 45, NWS Las Vegas, NV
NWS Las Vegas, NV issued this severe thunderstorm warning at Sep 11, 1998, 5:50 AM MST for Mohave County, Arizona. It was in force for 60 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, 5:50 AM MST (12:50 UTC)
- Expired
- Sep 11, 1998, 6:50 AM MST
- In force
- 60 min
- Issued by
- NWS Las Vegas, NV
- Area
- Whole counties
County Mohave County, AZ
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 11, 6:00 AM MST | Hail 1 | Wikieup, AZ | |
| Sep 11, 6:05 AM MST | Hail 1.75 | Wikieup, 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 nearest sounding before it
Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 0.8 hours before the alert went out and 185 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1435 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 31 m²/s²
- 0-3 km storm-relative helicity
- 158 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KLAS 111250 RRA SVRLAS AZC015-111350- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE LAS VEGAS NV 550 AM PDT (550 AM MST) FRI SEP 11 1998 * SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MOHAVE COUNTY IN NORTHWESTERN ARIZONA * UNTIL 650 AM MST (650 AM PDT) * SOME LOCATIONS AFFECTED WIKIEUP HIGHWAY 95 AT 549 AM MST...RADAR INDICATED A SEVERE THUNDERSTORM 8 MILES SOUTHWEST OF WIKIEUP. MOVEMENT WAS TO THE NORTHEAST AT 25 TO 30 MPH. STRONG DAMAGING WINDS ARE LIKELY WITH THIS STORM. IF YOU ARE OUTDOORS...MOVE TO A PLACE OF SHELTER IMMEDIATELY IF A STORM APPROACHES. MOTORISTS SHOULD REMAIN ALERT FOR REDUCED VISIBILITIES DURING DOWNPOURS OF RAIN. STREETS MAY FLOOD QUICKLY. PIERCE
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, 3:30 AM MST, 2 hours 20 minutes earlier.
Area forecast discussion, Sep 11, 3:30 AM MST, 2 hours 20 minutes before
MOJAVE DESERT/SOUTHERN GREAT BASIN AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE LAS VEGAS NV 330 AM PDT FRI SEP 11 1998 SYNOPSIS...AN AREA OF LOW PRESSURE OVER WESTERN NEVADA WILL SLOWLY MOVE SOUTHWARD INTO SOUTH CENTRAL CALIFORNIA TODAY. 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 TODAY FOR A CONTINUED THREAT OF SHOWERS AND THUNDERSTORMS THROUGH SATURDAY. DISCUSSION...WATER VAPOR LOOP SHOWS UPPER LOW OVER WESTERN NEVADA WITH JETSTREAM SLICING ACROSS EASTERN NEVADA. SHORTWAVES ROTATING AROUND UPPER LOW SEEN OVER CENTRAL CALIFORNIA AND SOUTHWEST UTAH. PLUME OF MOISTURE OFF TROPICAL DEPRESSION JAVIER STREAMING NORTH INTO ARIZONA. PACKAGE BASED ON NGM/AVN WITH ETA DISCOUNTED. PRECIPITABLE WATER SOUNDER DETECTS AREA GREATER THAN AN INCH ACROSS ARIZONA MOVING UP COLORADO RIVER TO EXTREME SOUTHERN NEVADA. AT 10Z...RADAR AND SATELLITE CONFIRM THE PRESENCE OF THUNDERSTORMS IN NYE AND LINCOLN COUNTIES AND STORMS ERUPTING IN PLUME OF MOISTURE OVER ARIZONA. UPPER LOW WILL SLOWLY SAG SOUTH INTO CENTRAL CALIFORNIA TODAY. JUST LIKE UPPER LOW FROM LAST WEEKEND BEST FORCING WILL BE ASSOCIATED WITH UPPER LEVEL DIFFLUENCE WHICH TODAY WILL BE ACROSS ARIZONA THEN WRAP BACK EAST INTO CENTRAL NEVADA. CLOSER TO UPPER LOW COLD POOL ALOFT SHOULD BE ENOUGH TO DESTABILIZE THE ATMOSPHERE. MOST STORMS WILL END IN THE EVENING BUT WOULD NOT BE SURPRISED TO SEE A FEW CONTINUE ALL NIGHT OVER NORTHWEST ARIZONA WHERE MOISTURE WILL BE MORE PLENTIFUL. ON SATURDAY NGM/AVN SPREADING DRIER MORE STABLE (WARM AIR ALOFT) FURTHER EAST WHILE NORTHWEST ARIZONA LIES UNDER WESTERN JEDGE OF MONSOON MOISTURE BOUNDARY. HAVE TRIMMED BACK POPS OR REMOVED MENTION ALL TOGETHER IN THE WESTERN ZONES. A DECREASING TREND CONTINUES THROUGH THE EXTENDED PERIOD WITH TEMPERATURES HOVERING NEAR SEASONAL NORMALS. LAS 330 PIERCE
The office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 11, 11:42 AM MST | Flash Flood Warning | VEF | Mohave | 2 hr |
| Sep 11, 2:30 PM MST | Severe Thunderstorm Warning | VEF | Mohave | 105 min |
| 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 |
Nearby
Severe Thunderstorm Warnings in Arizona, 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.