I'm in Austin/Round Rock (Central TX), everything's normal here.

Hey, just wanted to add my 2 cents. My hubby is a soldier on Fort Hood and has been in the field for two weeks training on North Fort Hood (Gatesville area). There is lots of training going on right now, ie ranges, helicopters, etc. It could explain some of what you are hearing. Of course I nor anyone else can say for sure, but did want to let you know that yes I know for a fact that there is training going on right now.

Did anybody hear it again tonight around 9:40 pm?

All has since been quiet, with the major exception of new and unwelcome construction in my immediate surroundings, and the never-ending source of house-rattling earthquakes known as the Fort Hood range.

Just happened again. 9:39pm CST.

i have been watching this thread since it was originally posted. The noise you have described along with the times given points directly to SpaceX. The sudden start, the almost even rumble and the abrupt ending is how a engine test sounds. For each of the dates and times given directly correlates with tests at the Mcgregor site.

As far as the one poster who called SpaceX, Tests are not secret and can be seen from public roads around the site. The individual you spoke with may have been in cali, and quite frankly didnt have any idea of what the test schedule was so replied with a rubber stamp response. Tests are often performed twice a day 6 days a week and are very much routine. You may question as why you don't hear all of the tests if they are so routine... Wind, Cloud cover, and being home in a quiet environment contribute to noticing a test. One poster questioned why there didnt seem to be any concern out of the Mcgregor area, and the easiest response is they are used to it. Test times vary day to day so there is no way to predict when you might could hear a test.

Just wanted to post some insight and ease any concerns....

Thanks, TXme36. They actually came to my school and showed us a few videos of their facilities and a couple tests while explaining some things about their company, apparently to grab the attention of some experienced individuals for the prospect of obtaining our interest. They seem like really nice and very hard-working people. It's just amazing that I'd hear those rocket tests all the way over here. Of course if your goal is to go to mars, you need to think big.

I concur with your solution and consider this case now closed

Oh and by the way; welcome to ATS!

Jasmine, I can confirm the elevated activity at Ft. Hood. We had one go off that nearly shook our house off its foundation. And Patriotsrevenge, they absolutely would be testing at 9pm. During the meet and greet at TSTC they explained that they test all the way up to 10pm, and they're working on a rocket that can take off and land vertically.
Pretty cool stuff. Loud, but still cool. Fort Hood on the other hand is loud, physically shakes the earth for miles and is quite undesirable, mostly from the consistency of the noise.

Havox, those are some creepy sounds! No, the sounds I heard were nothing like that, although I sort of wish they were I especially liked the clip from Winnipeg, it reminds me of some of the hypnogogic sounds I hear.

Although nothing spectacular happens here, I'm considering dusting off the video camera and keeping it charged and ready for instances just like those.