EF1 tornado in Weld County, Colorado

Tornado June 12, 2017 · Weld County, Colorado

EF1

Rating

15.0 mi

Whole path

300 yd

Path width

NOAA records this tornado county by county. Its path ran through Weld County → Laramie County, Wyoming; the totals above are for the whole tornado.

EF0EF1EF2EF3EF4EF5Unrated

The path drawn at its surveyed width of 300 yards (0.17 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 touched down southwest of Hereford and continued to quickly move north northeast into Wyoming. Areas of sporadic tornado damage were noted from 8 miles south southwest of Hereford to north of Hereford near the Colorado-Wyoming border. The damage along the patch ranged from EF-0 to EF-1.

The wider storm

Severe thunderstorm produced damaging hail, ranging from quarter to softball size across eastern Larimer and northwestern Weld Counties. The tornado was assigned a damage rating of EF-1. Areas of sporadic tornado damage were noted from 8 miles south-southwest of Hereford to north of Hereford near the Colorado-Wyoming border. In Weld County, the tornado was approximately 300 yards in width at one point and its path was 7.24 miles in length, it then crossed over into Wyoming. According County and City Emergency Management, hail damage occurred in the northwest part of Weld county including the towns of Pierce and Nunn. Several vehicles sustained broken windshields. The windshields of two patrol vehicles with Weld County Sheriff's Office were damaged. The officers were responding to unrelated calls when their vehicles were struck by golf ball size hail. Light damage to cars and general aviation aircraft was also reported at the Northern Colorado Regional Airport in Loveland.

Began near Hereford (40.8995, -104.3346).

Source: NOAA Storm Events Database, event 693346. Narratives are written by the National Weather Service forecast office that issued the report.

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