A recent outage at the National Weather Service affected the dissemination of weather warnings. The issue occurred as severe thunderstorms were hitting the Midwest and Ohio Valley. The outage, which lasted for over an hour, was caused by a software upgrade to the main computer system used by forecasters.

This upgrade prevented severe thunderstorm, flash flood, and tornado warnings from being sent out in a timely manner. Further details about the outage and its impact are available from the National Weather Service and other sources, including CNN.