KTRK tweeted this picture, taken from a monitor turned to NASA TV.
NASA says the lightning came within a third of a mile of the launch pad. NASspaceflight.com is keeping a running account of preparations, and it notes the lightning strike "was VERY powerful at nearly 70,000 amps (realize your house uses about 200 amps and most lightning strikes are 20-30,000 amps.)"
Chris Bergin, managing editor of the site, says "Confirmed lightning strike at the pad, which requires data reviews by all affected systems -- engineering. Already in work."
If you like this story, consider signing up for our email newsletters.
SHOW ME HOW
Even if the reviews go well, the bad weather is predicted to still be around the area on Friday.