Time Change & Storm Initiation
With just a glance, you wouldn’t think that the end of Daylight Saving Time and thunderstorm development would have anything in common. However, it does have an impact on what time we see thunderstorms. Sunday’s threat appears to be more of an evening and nighttime threat as evening destabilization will drive storm development into the Ohio River Valley. As we set our clocks back one hour, the threat of seeing tornadoes after the sun goes down increases. This does not mean we will see an elevated risk of tornadoes overall.
— WeatherNation (@WeatherNation) November 4, 2017
The severe weather threat stretches from St. Louis to Cleveland Sunday afternoon into the evening, with thunderstorms continuing to develop after sunset. The sunset on Saturday is around 5:30pm Central Daylight Time. Daylight Saving Time comes to an end Sunday morning at 2:00am. As we “fall back” one hour, the sun will set closer to 4:30pm Central Standard Time, giving an extra hour of darkness to a potentially dangerous evening. This is something residents of the Ohio River Valley need to keep in mind on Sunday. Storm initiation is expected to start around 2:00pm Central Standard Time and last into the evening hours.
Even though it is November, the National Weather Service out of Chicago, IL reminds us that this time of year has a history of causing dangerous weather.