Weather Alerts Map

Ontario weather alerts

There are no active weather alerts for Ontario, CA right now.

The National Weather Service issues alerts for Ontario as part of San Bernardino County.

Updated from the National Weather Service · lists refresh hourly; the live map loads current alerts directly from the NWS

Map data: NWS, OpenFreeMap, OpenStreetMap

Tornado history within 25 miles of Ontario

25 tornadoes have been recorded within 25 miles of Ontario since 1950, injuring 5 people. The most recent was on February 23, 2023 (rated EF0).

EF0: 19EF019EF1: 5EF15EF2: 1EF21EF3: 0EF3EF4: 0EF4EF5: 0EF5
Tornadoes by (E)F rating

Strongest tornadoes within 25 miles of Ontario

DateRatingCountyPath lengthWidthDeathsInjuries
May 22, 2008EF2Riverside County2.8 mi75 yd01
March 16, 1977F1Orange County10.9 mi10 yd04
November 25, 1965F1San Bernardino County2 mi50 yd00
March 16, 1986F1Orange County1.2 mi40 yd00
January 14, 1993F1Orange County1 mi30 yd00

Most recent tornadoes

DateRatingCountyPath lengthWidthDeathsInjuries
February 23, 2023EF0Los Angeles County0.1 mi15 yd00
May 22, 2008EF0Riverside County0.4 mi10 yd00
May 22, 2008EF0Riverside County1 mi20 yd00
May 22, 2008EF2Riverside County2.8 mi75 yd01
May 22, 2008EF0Riverside County0.9 mi20 yd00

California tornado history and map →

How often alerts are issued for San Bernardino County

Alert type2016–2025Last issued
Flood Advisory596October 30, 2026
Flash Flood Warning527October 21, 2026
Wind Advisory318October 22, 2026
Severe Thunderstorm Warning183October 10, 2026
Flood Watch116November 1, 2026
High Wind Warning78October 15, 2026
Winter Weather Advisory73November 17, 2025
High Wind Watch68October 15, 2026
Extreme Heat Warning65September 10, 2026
Winter Storm Warning61February 16, 2026

Full San Bernardino County alert history →

About Ontario

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