Sekai Chandra
sekaiwx.bsky.social
Sekai Chandra
@sekaiwx.bsky.social
GT EAS 2027
This is why most CM1 supercells don't produce tornadoes.

Individual discrete storms need help to reach the tornadogenesis threshold unless the environment is extremely top-tier (4/27 level).

This help comes from nudgers/mergers/boundaries/etc.
December 3, 2025 at 6:42 PM
-convection more than tilted negative troughs due to greater separation between 500 and 850 mb (see below) wind vectors.

That was clearly the case today.

Strong tornadoes are not uncommon in southern Brazil/northern Argentina, but major (F3+) strikes on cities are very rare.
November 8, 2025 at 1:58 AM
Nearby soundings show extremely large lower-level hodographs in the region, coupled with some dry air aloft, which would help offset and prevent an extremely crowded storm mode.

The setup was caused by a large, broad zonal trough. Zonal troughs tend to favor discrete-
November 8, 2025 at 1:58 AM
I could find the link to one of the videos (the top right screenshot): facebook.com/reel/8185070...

Commercial buildings have also been destroyed. It appears that the city took a direct hit.

This appears to be the worst SHEM single-city tornado strike since Muitos Capoes, BR (2005).
320 reactions · 174 shares | Mais sobre a destruição pelo vento em Rio Bonito do Iguacu | Sfrancisco Laranjeiras
Mais sobre a destruição pelo vento em Rio Bonito do Iguacu
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November 8, 2025 at 1:57 AM
Ooh interesting, will take a closer look for sure!
June 20, 2025 at 4:46 PM