Heavy Rainfall to Bring Flooding Threat to California; Heavy Snow in the Sierra

A strong atmospheric river will bring heavy rainfall to California through the holiday week. The heaviest rainfall is expected on Wednesday in the Los Angeles Basin. Flash and urban flooding is possible. A prolonged heavy snowfall is expected in the Sierra Nevada from the atmospheric river, raising concerns for major snow‐load impacts. Travel may be difficult to impossible over the passes. Read More >

June 2020 UPDATE: Check out this interactive StoryMap on the June 17, 2010, tornado outbreak.

A historic Northern Plains tornado outbreak occurred during the afternoon and early evening of June 17, 2010. At least 30 tornadoes occurred across eastern North Dakota and northwestern Minnesota during the 4 hour period from 4 pm to 8 pm.3 EF4 tornadoes occurred in Minnesota and 1 occurred in North Dakota. The occurrence of numerous strong tornadoes in this region is rare.

Meteorological Overview

Wadena and Almora, MN EF4s

Mentor, MN EF3

Holmes, ND EF4

Tornado Tracks from June 17, 2010

This tornado outbreak:

- was directly related to 3 fatalities

- was the most for the area since June 6, 1999, when 17 tornadoes were reported in North Dakota and 3 in Minnesota, with an F4 tornado in Mountain, North Dakota.

- included the first EF-4 to occur in Minnesota since July 25th, 2000.

- was the most EF-4s or stronger in any single event in Minnesota since April 1967.

- was the first time that an outbreak produced 4 EF-4s for the entire nation since the Super Tuesday outbreak of February 2008.

For more information on the influence of El Nino in the active 2010 severe weather season, visit this page.

For a great account of a storm chaser's perspective of the event, click HERE (credit Jonathan Finch, NWS DDC).

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Heavy Rainfall to Bring Flooding Threat to California; Heavy Snow in the Sierra

June 17, 2010 Tornado Outbreak