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EF1 tornado in Fresno County, California

Tornado January 17, 2019 · Fresno County, California

EF1
Rating
0.2 mi
Path length
20 yd
Path width
$500K
Damage as recorded
EF0EF1EF2EF3EF4EF5Unrated

The path drawn at its surveyed width of 20 yards (0.01 mi) — zoom in and the swath grows to true scale. Other tornadoes recorded nearby that day are shown faint.

What EF1 means. On the Enhanced Fujita scale, EF1 is moderate damage: roofs badly stripped, mobile homes pushed off foundations or overturned, windows broken, consistent with estimated gusts of 86–110 mph. The rating comes from a survey of the worst damage after the storm, not from a wind measurement, so it says as much about what the tornado hit as about how strong it was.

What the National Weather Service wrote

A tornado was determined by radar and observed by public and media. Submitted video indicated damage to a building and showed the tornado which touched down near the intersection of Herndon Ave. and Academy Ave. east of Clovis. The tornado was rated EF1 based on official NWS storm survey.

The wider storm

A strong low pressure system with a deep moisture fetch pushed into central California during the afternoon of January 16 and brought moderate to heavy precipitation along with strong winds to much of the area through the afternoon of January 17. Several reports of roadway flooding were received during the morning of January 17 when the heaviest precipitation occurred. Flash flooding and debris flows were reported in the Ferguson Fire burn area in Mariposa County and State Route 140 was closed for over 11 hours. The precipitation turned to showers and isolated thunderstorms during the afternoon of January 17. One thunderstorm produced a tornado east of Clovis which was rated as EF-1 following a storm survey of the damage it produced. Most of the San Joaquin Valley and Kern County Deserts picked up between half an inch to an inch of rain while the Southern Sierra Nevada had 2 to 4 inches of liquid precipitation and the Kern County Mountains had 1.5 to 3 inches of liquid precipitation. The precipitation mainly fell as snow above 7000 feet where several locations in the higher elevations of the Southern Sierra Nevada above 7000 feet picked up 10 to 20 inches of new snowfall. There were also several reports of post-frontal wind gusts exceeding 50 mph in the Kern County Mountains and Deserts while a few low impact indicator sites had gusts exceeding 65 mph.

Began near Academy (36.8400, -119.5600).

Source: NOAA Storm Events Database, event 793391. Narratives are written by the National Weather Service forecast office that issued the report.

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