The May 11, 1999 tornado

F4Mason County, Texas

An F4 tornado on a 7.0-mile path that killed 1 and injured 6. It was one of 8 tornadoes recorded in the U.S. that day, 2 of them rated F3/EF3 or stronger.

Watch how it happened

F4 tornado · May 11, 1999

How it happened

Follow the tornado’s path, minute by minute.

About this replay
Local time (CST)—Historical replay — logged times
Distance—of 7.0 miles
Now in—
RatingF4

The tornado

Rating
F4
Fujita scale
Path length
7.0 mi
Width up to 1,400 yards
Killed
1
Along the whole path
Injured
6
Along the whole path
Date and time
Tuesday, May 11, 1999
5:05 PM CST
That day
8
tornadoes in the U.S.; more on this date

The National Weather Service account

Written by the local Weather Service office after its damage survey.

A large multiple-vortex tornado ripped through eastern Mason County during the late afternoon hours. The slow moving tornado first touched down near the Llano River 9 miles northwest of Loyal Valley and then travelled a 7-mile long path, finally dissipating 5 miles north of Loyal Valley. This tornado, whose width would reach three-quarters of a mile wide at times, caused widespread devastation. Two homes were completely destroyed, with debris scattered over great distances. Large pieces of a pick-up truck were located three-quarters of a mile away from the house where it had been left. Tragically, one person was killed and 5 others were injured when that same house was destroyed. The people had sought refuge in a car in a stone garage, but as the tornado tore across the garage, debris smashed through the car, killing one man and injuring the remaining occupants. Sixteen other houses were damaged, along with additional barns and outbuildings. Numerous head of cattle and deer were also killed as the tornado passed. When the tornado crossed Farm-to-Market Road 152, a stretch of asphalt 720 feet wide was ripped off of the road surface.

The storm system that day

A series of supercell thunderstorms ripped across the Heartland and Northwest Hill Country on the afternoon of the 11th. Three tornadoes would touch down, including a devastating F4 tornado north of Loyal Valley in eastern Mason County. One person was killed and 6 others injured as the three-quarters of a mile tornado tracked a 7 mile long path.

NOAA NCEI Storm Events Database.

Counties on its path

Storm Prediction Center severe weather database. Path drawn as a straight line from the recorded start to end point.