Alert archive / Arizona / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 19, NWS Las Vegas, NV
NWS Las Vegas, NV issued this severe thunderstorm warning at Aug 8, 1998, 3:30 AM MST for Mohave County, Arizona. It was in force for 45 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Aug 8, 1998, 3:30 AM MST (10:30 UTC)
- Expired
- Aug 8, 1998, 4:15 AM MST
- In force
- 45 min
- Issued by
- NWS Las Vegas, NV
- Area
- Whole counties
County Mohave County, AZ
The nearest sounding before it
Flgstf/Belemont, AZ (KFGZ), launched 00:00Z, 10.5 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
- 2984 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 9 m²/s²
- 0-3 km storm-relative helicity
- 38 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 081031 RRA SVRLAS AZC015-081115- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE LAS VEGAS NV 330 AM PDT (330 AM MST) SAT AUG 8 1998 * SEVERE THUNDERSTORM WARNING FOR CENTRAL AND NORTH CENTRAL MOHAVE COUNTY IN NORTHWESTERN ARIZONA * UNTIL 415 AM MST (415 AM PDT) * SOME LOCATIONS AFFECTED KINGMAN CHLORIDE DOLAN SPRINGS * AT 325 AM MST RADAR INDICATED A SEVERE THUNDERSTORM OVER KINGMAN. MOVEMENT WAS TO THE NORTH AT 20 MPH. STRONG DAMAGING WINDS ARE LIKELY WITH THIS STORM. A SKYWARN SPOTTER REPORTED FREQUENT LIGHTNING...STRONG WINDS AND VERY HEAVY RAIN IN KINGMAN AT 320 AM MST. POWER AND PHONE SERVICE HAS BEEN KNOCKED OUT IN PARTS OTF KINGMAN. &
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 Aug 8, 3:11 AM MST, 19 minutes earlier.
Area forecast discussion, Aug 8, 3:11 AM MST, 19 minutes before
MOJAVE DESERT/SOUTHERN GREAT BASIN AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE LAS VEGAS NV 311 AM PDT SAT AUG 8 1998 SYNOPSIS...MOIST AND UNSTABLE AIR OVER THE MOJAVE DESERT AND PARTS OF THE SOUTHERN GREAT BASIN WILL RESULT IN SCATTERED SHOWERS AND THUNDERSTORMS TODAY. MOISTURE WILL THEN INCREASE ACROSS THE REGION SUNDAY FOR AN EVEN GREATER THREAT OF THUNDERSTORMS. THE EXCEPTION WILL BE FROM THE SIERRA NEVADA MOUNTAINS AND INTO PARTS OF WESTERN NEVADA WHERE DRIER AIR WILL CONTINUE TO LIMIT THUNDERSTORM DEVELOPMENT. DISCUSSION...OUTFLOW BOUNDARY FROM MESOSCALE CONVECTIVE SYSTEM (MCS) OVER W CENTRAL AZ HAS TRIGGERED ADDITIONAL STORMS OVER MOHAVE COUNTY AZ AND SRN CLARK CO NV. THIS ALSO BRINGING SURGE OF LOW LEVEL MOISTURE UP CO RIVER VALLEY AS CONFIRMED BY SURFACE DEWPOINT AND STREAMLINE ANALYSIS (LOW TO MID 60 DEWPOINTS UP THROUGH BLH TO LHU). SO FAR...STORMS STRONG BUT NOT SEVERE WITH GUSTS OF 35 TO 40 MPH REPORTED BY IGM AND EED ASOS. THIS COMPLICATES FORECAST A GREAT DEAL AS ADDITIONAL OUTFLOW COULD TO TRIGGER MORE STORMS ACROSS SRN NV THIS MORNING. ALSO CONCERNED THAT EARLY MORNING CONVECTION MAY STABILIZE ATMOSPHERE SOME...DELAYING ONSET OF STORMS LATER TODAY. REMOVED AFT/EVE WORDING IN FORECAST TO SIMPLIFY THINGS A BIT. 00Z DRA SOUNDING SUGGESTED AT LEAST HYBRID MICROBURST TYPE STORMS POSSIBLE TODAY WITH DEEPER MOISTURE IN THE 400 TO 600 MB LAYER. HOWEVER...INCREASED MOISTURE IN THE BOUNDARY LAYER FROM OUTFLOW WILL CHANGE THIS WITH MORE WET TYPE/HEAVY RAIN PRODUCING CELLS POSSIBLE. MODELS IN GENERAL AGREEMENT IN KEEPING UPPER HIGH CENTERED NEAR FOUR CORNERS REGION/NRN NEW MEXICO THROUGH SUNDAY. INFLUENCE OF TROPICAL STORM FRANK UNCERTAIN AS IT MOVES PARALLEL ALONG BAJA COAST BEFORE TURNING NW. THIS MAY HELP SET UP LOW LEVEL GULF SURGE TONIGHT/SUNDAY WHILE FLOW AROUND HIGH INJECTS ADDITIONAL MID LEVEL MOISTURE. EITHER WAY THREAT OF THUNDERSTORMS WITH HEAVY RAIN INCREASES SUNDAY SO DECIDED TO HIT THIS HARDER IN FORECAST. PER COORDINATION WITH RNO...KEPT SRN NV EXTENDED CLOSER TO UKMET/ECMWF IDEAS WITH UPPER HIGH REMAINING IN POSITION TO KEEP MOISTURE FEED GOING. MRF/AVN HAVE DONE POORLY LATELY ON POSITION OF UPPER HIGH AND FEEL DRYING SEEN ON AVN FOR MONDAY WAY OVERDONE. LAS 336. NEMETH
In the hours before
Local storm report, Aug 7, 9:53 PM MST, 5 hours 37 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS, NV
953 PM PDT FRI AUG 07 1998
TIME(PDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0230 PM NORTH LAS VEGAS AIRPORT NV 63 MPH TSTM GUST
08/07/98 CLARK WIND GUSTS OBSERVED AS
HIGH AS 63 MPH BEFORE
POWER OUTAGE OCCURRED.
0300 PM NORTH LAS VEGAS NV WIND DAMAGE
08/07/98 CLARK 2 PLANES FLIPPED OVER AT
NORTH LAS VEGAS AIRPORT
AND POWER POLES KNOCKED
DOWN NEAR THE INTERSECTION
OF CRAIG AND RANCHO.
0303 PM LAS VEGAS BAY-LAKE MEAD NV 65 MPH TSTM GUST
08/07/98 CLARK *** 1 INJ ***
A BOAT CAPSIZED AT LAS
VEGAS BAY WITHIN THE LAKE
MEAD RECREATION AREA DUE
TO A 65 MPH WIND GUST
WHICH CAUSED MINOR INJURY
TO AN ELDERLY MAN.
0330 PM LOGANDALE NV 1.75 INCH HAIL
08/07/98 CLARK NATIONAL PARKS SERVICE
REPORTED THAT GOLF BALL
SIZE HAIL HAD FALLEN
SOUTHWEST OF LOGANDALE.
0345 PM SANDY COVE - LAKE MEAD NV WIND DAMAGE
08/07/98 CLARK WIND GUSTS OVERTURNED BOAT
AT SANDY COVE EAST OF
CALVILLE BAY...6 PERSONS
RESCUED FROM BOAT
0349 PM LAS VEGAS MC CARRAN ARPT NV 61 MPH TSTM GUST
08/07/98 CLARK LAS VEGAS MCCARRAN
INTERNATIONAL AIRPORT ASOS
REPORTED PEAK WIND GUST OF
61 MPH.Local storm report, Aug 7, 9:53 PM MST, 5 hours 37 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS, NV
953 PM PDT FRI AUG 07 1998
TIME(PDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0230 PM NORTH LAS VEGAS AIRPORT NV 63 MPH TSTM GUST
08/07/98 CLARK WIND GUSTS OBSERVED AS
HIGH AS 63 MPH BEFORE
POWER OUTAGE OCCURRED.
0300 PM NORTH LAS VEGAS NV WIND DAMAGE
08/07/98 CLARK 2 PLANES FLIPPED OVER AT
NORTH LAS VEGAS AIRPORT
AND POWER POLES KNOCKED
DOWN NEAR THE INTERSECTION
OF CRAIG AND RANCHO.
0303 PM LAS VEGAS BAY-LAKE MEAD NV 65 MPH TSTM GUST
08/07/98 CLARK *** 1 INJ ***
A BOAT CAPSIZED AT LAS
VEGAS BAY WITHIN THE LAKE
MEAD RECREATION AREA DUE
TO A 65 MPH WIND GUST
WHICH CAUSED MINOR INJURY
TO AN ELDERLY MAN.
0330 PM LOGANDALE NV 1.75 INCH HAIL
08/07/98 CLARK NATIONAL PARKS SERVICE
REPORTED THAT GOLF BALL
SIZE HAIL HAD FALLEN
SOUTHWEST OF LOGANDALE.
0345 PM SANDY COVE - LAKE MEAD NV WIND DAMAGE
08/07/98 CLARK WIND GUSTS OVERTURNED BOAT
AT SANDY COVE EAST OF
CALVILLE BAY...6 PERSONS
RESCUED FROM BOAT
0349 PM LAS VEGAS MC CARRAN ARPT NV 61 MPH TSTM GUST
08/07/98 CLARK LAS VEGAS MCCARRAN
INTERNATIONAL AIRPORT ASOS
REPORTED PEAK WIND GUST OF
61 MPH.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; the sounding from the Mesonet's radiosonde archive.