#CISWS24 is the first in-person symposium since 2018 and attendance is good. I overheard that there were about 250 registrations.

First talk is NWS Indianapolis Warning Coordination Meteorologist Sam Lashley on the 50th anniversary of the April 3, 1974 Super Outbreak. #CISWS24

The NWS used teletypes until the late 80s - Lashley
Many text products still carry vestiges of that era today. - Me
#CISWS24

Fujita originally called the outbreak the "Jumbo Outbreak" because of the year (74) and third day of the fourth month (3+4=7), which reminded him of the Boeing 747. #CISWS24

Fujita originally rated the Xenia, OH tornado EF6 based on aerial survey. He adjusted it down to EF5 after an on-the-ground survey. #CISWS24

I'm always uneasy comparing tornado counts across shifts in radar technology. We're probably much better at finding the low-end (EF0-1) tornados now because we get hints on radar of where to look for them. I wonder if it's better to compare outbreaks solely on EF2+. #CISWS24

The same day of the Super Outbreak, there was also a 4.5 earthquake centered new Mattoon, Illinois. #CISWS24

Lashley says there's an emergency manager in an unspecified Ohio County that sends a drone up after almost every strong thunderstorm and finds small circulations that wouldn't have been found otherwise. #CISWS24

Up next: Greg Melo from NWS Indianapolis reviews the March 31, 2023 tornado outbreak. #CISWS24

When upper-level jet streaks are orthogonal to the warm sector, there's a higher chance for tornado outbreaks. 96% of violent outbreaks show this alignment. This has been nicknamed the "violent outbreak cross" (VOC) #CISWS24

Now some student lightning talks! #CISWS24