Storm Impacting the Northwest U.S.; Fire Weather Conditions in Southern California; Severe Weather in the South

A Pacific storm is bringing areas of low elevation rain, moderate to heavy mountain snow, and high winds to the Northwest. Strong Santa Ana winds and very dry conditions are producing elevated to critical fire weather conditions in southern California. Isolated strong to severe thunderstorms are possible through early Wednesday morning across parts of northeast Texas into western Tennessee. Read More >

A year ago, on August 10, 2020, a line of intense thunderstorms called a “derecho” resulted in four deaths, dozens of injuries, and significant damage across the Midwest, including damage locally across parts of central Indiana. The National Oceanic and Atmospheric Administration (NOAA) estimates that this single day of extreme weather cost over $11 billion, making it the most expensive thunderstorm event in modern U.S. history. A thorough review of this event can be found on the August 10, 2020 Derecho Story Map webpage.

radar

Radar reflectivity of the August 10, 2020 Derecho at one-hour time steps

warn path

Map of Severe Thunderstorm Warnings issued by the NWS for the derecho event.

Severe Weather Communication Improvement

To better communicate the threat of such a destructive severe thunderstorm, the NWS has begun issuing Severe Thunderstorm Warnings using damage threat categories. Warnings tagged with DESTRUCTIVE will trigger a Wireless Emergency Alert on your smartphone/mobile device. The plans for implementing Wireless Emergency Alerts for severe thunderstorms were underway when the derecho occurred, but the event hastened implementation of this capability, so the public can be warned more directly. Our Webstory contains additional details about this important update.

Additional Information Resources:

Severe Storms of August 10, 2020 (weather.gov) (central Indiana review)

https://www.facebook.com/NWSIndianapolis/

https://twitter.com/nwsindianapolis

NWS Storm Prediction Center

NWS Severe Thunderstorm Safety

August 10, 2020 Derecho Story Map

Follow us on X