Alert archive / Texas / Tornado Warnings in 1991

Tornado Warning 21, NWS Fort Worth, TX

April 18, 1991McLennan County, Texas

NWS Fort Worth, TX issued this tornado warning at Apr 18, 1991, 6:10 PM CDT for McLennan County, Texas. It was in force for 65 min. 3 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: Apr 18, 1991, 6:10 PM CDT (23:10 UTC)
Expired: Apr 18, 1991, 7:15 PM CDT
In force: 65 min
Issued by: NWS Fort Worth, TX
Area: Whole counties

County McLennan County, TX

What was reported inside it

Time	Report	Where
Apr 18, 6:32 PM CDT	Hail 0.75	Mclennan, TX
Apr 18, 6:32 PM CDT	Hail 0.75	Mclennan, TX
Apr 18, 6:45 PM CDT	Thunderstorm Wind 0	Mclennan, TX

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. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Stephenville/Cla, TX (KSEP), launched 12:00Z, 11.2 hours before the alert went out and 113 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: 227 J/kg
Mixed-layer CIN: -285 J/kg
Mixed-layer LCL: 1857 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 182 m²/s²
0-3 km storm-relative helicity: 176 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KACT 182312
TORACT
TXC309-190015-
 
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE WACO TX
610 PM CDT THU APR 18 1991
 
THE NATIONAL WEATHER SERVICE IN WACO HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL  715 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN NORTH CENTRAL TEXAS
 
   ...MCLENNAN COUNTY
 
AT 610 PM CDT RADAR INDICATED A POSSIBLE TORNADO 5 MILES WEST OF
CRAWFORD. ALSO SPOTTER REPORTED GOLF BALL TO TENNIS BALL SIZE
HAIL.
 
MOVEMENT WAS TO THE SOUTHEAST 20 MPH...MOVING TOWARD WACO.
 
 
THIS IS A DANGEROUS STORM SITUATION.  ACT QUICKLY.  IF YOU ARE
IN THE PATH OF THIS TORNADO MOVE TO A SHELTER BELOW GROUND IF
AVAILABLE.  OTHERWISE...GO TO A SMALL INTERIOR ROOMP ON THE LOWEST
FLOOR POSSIBLE.  AVOID WINDOWS.  ABANDON CARS AND MOBILE HOMES
FOR A REINFORCED BUILDING OR GET INTO A DITCH OR CULVERT.

The office that day

Everything else NWS Fort Worth, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 18, 5:00 PM CDT	Severe Thunderstorm Warning	FWD	Johnson, Tarrant	45 min
Apr 18, 5:06 PM CDT	Severe Thunderstorm Warning	FWD	Coryell, McLennan	69 min
Apr 18, 5:08 PM CDT	Severe Thunderstorm Warning	FWD	Hamilton	67 min
Apr 18, 5:20 PM CDT	Severe Thunderstorm Warning	FWD	Tarrant	55 min
Apr 18, 5:32 PM CDT	Severe Thunderstorm Warning	FWD	Bosque	58 min
Apr 18, 5:40 PM CDT	Severe Thunderstorm Warning	FWD	Dallas, Ellis	65 min
Apr 18, 5:45 PM CDT	Severe Thunderstorm Warning	FWD	Johnson	30 min
Apr 18, 6:12 PM CDT	Severe Thunderstorm Warning	FWD	Tarrant	48 min
Apr 18, 6:26 PM CDT	Severe Thunderstorm Warning	FWD	Hill	64 min
Apr 18, 6:35 PM CDT	Tornado Warning	FWD	Navarro	40 min
Apr 18, 6:41 PM CDT	Severe Thunderstorm Warning	FWD	Dallas	49 min
Apr 18, 6:53 PM CDT	Severe Thunderstorm Warning	FWD	Ellis	52 min

Nearby

Tornado Warnings in Texas, 1991 Every tornado warning in 1991 Tornadoes in 1991

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.