Severe thunderstorms in southwest Missouri1-minute Mesoscale Domain Sector GOES-16 (GOES-East) “Red” Visible (0.64 µm) images (above) showed the rapid intensification of thunderstorms over far southwestern Missouri during the early evening hours on 19 July 2018. Surface outflow boundaries from these storms produced damaging winds (SPC storm reports), including gusts to 45 knots (52 mph) at Branson West at 2355 UTC (text) and 55 knots (63 mph) at Branson (plot | text) at 0025 UTC — and strong winds capsized a boat on Table Rock Lake (located about midway between Branson West Airport KFWB and Branson Airport KBBG, map), resulting in 17 fatalities.
The overshooting tops of these intensifying storms began to penetrate the anvil debris of pre-existing convection after about 2330 UTC in the Monett KHFJ area, with an above-anvil cirrus plume becoming evident after 0000 UTC. The 0025 UTC image showed yet another new cell which had recently developed immediately northeast of Branson; its overshooting tops began rapidly penetrating the anvil debris of the aforementioned storms at 0018 UTC.
The corresponding GOES-16 “Clean” Infrared Window (10.3 µm) images (below) revealed cloud-top infrared brightness temperatures cooling to the -75 to -79ºC range (shades of light gray to white) with these thunderstorms, significantly colder than the -68.5ºC tropopause temperature on the 00 UTC Springfield MO rawinsonde report (plot | text).