Alert archive / Arizona / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 14, NWS Las Vegas, NV

September 11, 1999Mohave County, Arizona

NWS Las Vegas, NV issued this severe thunderstorm warning at Sep 11, 1999, 4:47 PM MST for Mohave County, Arizona. It was in force for 58 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, 1999, 4:47 PM MST (23:47 UTC)
Expired: Sep 11, 1999, 5:45 PM MST
In force: 58 min
Issued by: NWS Las Vegas, NV
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Mohave County, AZ

What was reported inside it

Time	Report	Where	Remark
Sep 11, 5:24 PM MST	Hail 1.75	Peach Spgs, AZ	Golfball sized hail was reported near I-40 along the Mohave/Yavapai county line. No damage reports were received.
Sep 11, 5:40 PM MST	Hail 0.75	Kingman, AZ	Additional large hail was again observed at the Diamond M Ranch with hailstones generally around three-quarters (0.75) of an inch.

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, 11.8 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 363 J/kg
Mixed-layer CIN: -81 J/kg
Mixed-layer LCL: 1024 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 83 m²/s²
0-3 km storm-relative helicity: 138 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

Open this sounding in Storm Lab

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, 2:45 PM MST, 2 hours 2 minutes earlier.

Area forecast discussion, Sep 11, 2:45 PM MST, 2 hours 2 minutes before

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In the hours before

Local storm report, Sep 11, 1:42 PM MST, 3 hours 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NEVADA
130 PM PST SAT SEP 09 1999

TIME(PST)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....
 
1155 AM    DIAMOND M RANCH          AZ       3/4-1 INCH HAIL
           15 MILES SE VAENTINE              REPORTED BY WEATHER
            MOHAVE                           SPOTTER.
END

Local storm report, Sep 11, 1:44 PM MST, 3 hours 3 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NEVADA
130 PM PST SAT SEP 11 1999

TIME(PST)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....
 
1155 AM    DIAMOND M RANCH          AZ       3/4-1 INCH HAIL
           15 MILES SE VAENTINE              REPORTED BY WEATHER
            MOHAVE                           SPOTTER.
END

Local storm report, Sep 11, 2:30 PM MST, 2 hours 17 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NEVADA
130 PM PST SAT SEP 11 1999

TIME(PST)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

1155 AM    DIAMOND M RANCH          AZ       3/4-1 INCH HAIL
           15 MILES SE VAENTINE              REPORTED BY WEATHER
            MOHAVE                           SPOTTER.
END

The office that day

Everything else NWS Las Vegas, NV issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 11, 2:35 PM MST	Severe Thunderstorm Warning	VEF	Clark	55 min
Sep 10, 8:35 PM MST	Severe Thunderstorm Warning	VEF	Mohave	25 min
Sep 11, 11:58 AM MST	Severe Thunderstorm Warning	VEF	Mohave	62 min
Sep 11, 3:13 PM MST	Severe Thunderstorm Warning	VEF	Mohave	62 min

Nearby

Severe Thunderstorm Warnings in Arizona, 1999 Every severe thunderstorm warning in 1999

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.