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Anyone feel that boom that went around the city about 3 pm??  
What was it? Shook my condo by crocus plains and vm school..  
Crazy..

It started this morning while I was walking my dog. My wife says it's been going on all afternoon, approximately hourly. Maybe some construction? Demolition? Not sure...

Was on the radio its out at shilo

Felt it here in the West End as well.

Glad to read other people noticed the boom.. I know there isn’t a mine close by…. I felt the morning one. Even my dog was acting weird, like gun shots  
I couldn’t figure it out, I don’t know if it happens once in awhile, I’ve been living here in Brandon over a year. But it sure makes you think about a boom couldn’t even imagine being near or in a war…,  
 
Edited by Vel, 2022-12-02 07:37:28

I have to say in 40+ years of hearing the “boom” of the Shilo guns - we have never heard a boom like that one. The whole house shook and we live in the south west Brandon area. There 2 minor ones that morning but that one was off the charts!

do you think we ever know what the "boom" was?

The booms out in shilo were caused by aircraft dropping bombs it was part of training

JTAC’s from Shilo are doing training with B52 American bombers. Expect more booms in the coming weeks.

So a bomber in shilo dropping training bombs made my house shake in Alexander? Doesnt sound right.

This is just what goes on here. Like the sure and biting chill of winter, the window-rattling booms and the flares that blaze brighter than the moon, they're all just a part of where we live.  
 
There's actually a lot of history behind all this, so much so that it even predates The Great War. Shilo's in kind of a special place, and consequently all of us nearby are in kind of a special place, where it makes it more safe to train and learn.  
 
There's a whole museum just off of the #1 going east of town about all this. I've never been. I have enough understanding of war. But what they do at Shilo rests at the very heart of Canada's military contributions to the world.  
 
Edited by Hashidoi, 2022-12-02 23:53:02

Feeling and hearing it more because it's winter. Frozen ground likely makes the vibration travel farther.

Colder denser air allows sound to transfer further too, especially the lower frequencies.

Yep

TL:DR The science of waves can absolutely make your house in Alexander shake because that's how bombs work.  
 
My grandparents had property south of Neepawa growing up. We could regularly hear the plain old artillary at Shilo on clear summer days. I could only imagine what it was like if they dropped bombs!  
 
Sound waves travel so much further in cold weather. We live near the CP line here at the west edge of Brandon and it's SO LOUD when the trains are coming screaming in and sounding their horn at 50th Street. It's loud in the summer but deafening in -30. This is because of density changes in the air when it's cold.  
 
In 2006 there was a bow wind that came through town. A bow wind is basically a compression wave caused by severe thunderstorms. It was the outflow/compression wave from a thunderstorm near the US border. It hit the Riverheights neighbourhood especially bad (there were lots of trees down and damage in our immediate area where we lived up by the school back then). When the wind hit the house, I was leaning against an outside wall (we had no warning this was happening). The wall moved. Thankfully it wasn't enough to damage the house, but it was the first indication something was happening.  
 
So now think about what happens when there's a bomb or any loud explosion. It creates compression waves that radiates outwards. The waves can go through both the ground and the air. All sound are in fact compression waves - its amplitude and frequency is what gives it loudness and pitch. Big sounds create big (tall) waves. Low pitched sounds create large (long) waves. Long waves move through the ground and air much farther. Tall waves can travel far because it takes longer to lose all their energy.  
 
So take that an apply it to your situation. The explosion will create a very well-defined, almost rigid compression wave. The compression wave will be both long and tall, allowing it to travel far. Compression waves in the air, with the right conditions, can cause significant interaction with the environments (this is actually how nuclear bombs work - they explode relatively high off the ground on a timer, and the resulting compression wave is what destroys everything). Compression waves also travel through the ground. While Shilo has sandy soil that dampens a lot of that due to lack of density (why it's a great choice for artillery activity), the frozen ground impacts that. Plus, depending on the substrate and terrain heading up your way, you could have a better-than-average transmission of both the in-ground compression wave as well as the atmospheric one.  
 
So to sum up: yes, it's completely possible and in fact is extremely likely. That's what bombs are designed to do.

Now just think of the poor people in the Ukraine having to endure this 24/7 for 9 months now !

For all the years I have lived near Shilo-I have always been thankful that the firing we hear and the tanks and such that we see going by/helicopters and even fighter jets going over are merely training and it is not actually war. It would be so terrifying to hear these explosions and know they were the real thing, actual attacks on troops and civilians.  
 
 
My heart goes out to the people of Ukraine for what they are enduring all these months.