Dark impact mark on Jupiter now growing larger - also "developing two lobes"

JUPITER UPDATE: Something interesting is happening to the dark impact mark on Jupiter. Not only is it growing larger, but also "it seems to be developing two lobes," says amateur astronomer Mike Hood, who sends this July 28th picture from Kathleen, Georgia:

The same result has been obtained by astrophotographer Raffaello Lena of Rome, Italy. "On July 27th, the Jupiter impact site has evolved and now contained two condensed nucleii," he says.

These changes are surely caused by dynamics in Jupiter's upper atmosphere. High-resolution images from the Hubble Space Telescope show that the impact cloud is being molded by high-altitude winds and turbulence. On a planet where vortices are ubiquitous, perhaps it is no surprise that a cloud would organize itself into two or more swirling spots.

Amateur astronomers are encouraged to continue their monitoring: sky map. The cloud is located near Jupiter's System II longitude 210°. For the predicted times when it will cross the planet's central meridian, add 2 hours and 6 minutes to Sky and Telescope's predicted transit times for Jupiter's Great Red Spot.