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F0 tornado in Johnson County, Texas

Tornado December 29, 2006 · Johnson County, Texas

Rating

1.3 mi

Path length

70 yd

Path width

$40K

Damage as recorded

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The path drawn at its surveyed width of 70 yards (0.04 mi) — zoom in and the swath grows to true scale. Other tornadoes recorded nearby that day are shown faint.

What F0 means. This tornado was rated on Fujita’s original scale, used until 2007. F0 meant light damage: shingles and siding peeled, gutters torn, branches broken; the scale paired it with winds of 40–72 mph, figures later judged too high, especially toward the top of the scale, and revised downward in the Enhanced Fujita scale. Ratings then, as now, came from the damage.

What the National Weather Service wrote

The National Weather Service in Fort Worth conducted a damage survey and found that a tornado formed about 3 miles north of Alvarado. The tornado damaged a shed and caused roof and window damage to several structures along CR 604, east of the Happy Hill community, before dissipating.

The wider storm

A rare winter tornado outbreak occurred on December 29 over portions of North Texas, spawning almost two dozen tornadoes. Very high shear and low instability created an environment favorable for tornadoes. A strong surface low pressure system and warm front located in southern North Texas increased the probablitity for low-level rotation. In addition to tornadoes, severe reports of large hail and flash flooding were widespread.

Began near Alvarado (32.4405, -97.2200).

Other tornadoes from the same storm system

21 more tornadoes the National Weather Service filed under this storm episode.

Source: NOAA Storm Events Database, event 7137. Narratives are written by the National Weather Service forecast office that issued the report.

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