News Earth Squall line tornadoes are sneaky, dangerous and difficult to forecast Data from the Southeast could improve forecasts of these destructive twisters In 2022 and 2023, PERiLS researchers deployed across the southeastern United States used a fleet of instruments to capture a trove of data on squall line tornadoes. Mobile Mesonet vehicles (shown) took surface measurements of temperature, pressure, humidity, wind and solar radiation. Michael Coniglio, NOAA NSSL Share this:EmailFacebookTwitterPinterestPocketRedditPrint By Nikk Ogasa August 9, 2024 at 1:00 pm Meteorologist Thea Sandmael watched the storm close in.