To start this monthly edition, check out those two swirls above — the one on the left, a remnant MCV (mesoscale convective vortex, or spinning thunderstorm system) over the desert of Arizona, resembled a weakening eastern Pacific ex-hurricane moving over colder water, and then there was one of those (Fernanda, on the right).
Speaking of Fernanda… When it was a hurricane, at sunrise:
In the Gulf of Mexico, Tropical Storm Emily spun up relatively suddenly. It was interestingly a distinct entity while nevertheless still being involved with a non-tropical frontal system.
Farther east, way out in the Atlantic, Tropical Depression Four and a whole lotta dust.
At one point, when zooming in and adding color to a visible/IR combo satellite image, TD4 had a wild appearance with its deep convection surrounded by cirrus filaments.
And on a gray scale image, can you see the freaky face?
These were tropical cyclones having a Fujiwhara interaction in the western Pacific.
This curious little system was up in mid latitudes and not a tropical cyclone, but looked like a sheared one with thunderstorms blown to the east of a low-level center.
Even farther north, a vivid hook echo with a supercell thunderstorm in Manitoba, Canada.
A long-lived thunderstorm system which produced an intense derecho, as seen with GOES-16.
— UW-Madison SSEC (@UWSSEC) July 26, 2017
Finally, multiple “undular bores” overlapping each other!
— Stu Ostro (@StuOstro) July 11, 2017