A Catholic shouldn't assign supernatural meanings to natural causes. That is the very definition of superstition.

If your tire went flat, it means that a sharp object penetrated it, or that your tire tread wore too low and the tire was ready for replacement. If your tire went flat, it means that you need a new tire -- not that God is displeased with the destination from which you were leaving, or to which you were going.

Any good Traditional priest would give you the same answer:

"Hey, Father. I have been having chest pains. What is God trying to tell me?"
"I think God is trying to tell you to go see your doctor, my good man!"

or

"Hey, Father. Can you bless my car? It has been shaking a lot every time I apply the brakes."
"Sure, my son, but only if you promise me you'll take it to a garage to have the brakes looked at."

Catholic priests represent the true God, and serve the truth. They are eminently practical. There is not the slightest friction or strife between the Truth/Reality/Science and God and His religion.

Remember, our religion is NOT superstition. And our priests are NOT charlatans and frauds, unlike the protestant ministers, psychics, shamans, and witch doctors that exist out there to siphon a living off of unsuspecting, ignorant dupes.

If your car broke down in some way, likewise there was probably a natural explanation for it. Mechanical parts of a car fail on a daily basis, all over the country. Brakes, transmissions, radiators, hoses, starters, batteries -- you name it.

Not to say that God doesn't intervene sometimes, but when He intervenes, there's no mistaking it. Protestants constantly attribute God to things that are merely natural -- because those pathetic nincompoops don't HAVE any REAL miracles! They have neither saints nor miracles in their false heretical sects. They're desperate for anything more interesting than the common and the ordinary. For the desperate, even a strange coincidence will do!

If you were thinking and praying to God, "Maybe I should sell my house and move closer to a large Trad group with daily Mass..." and then a young couple knock on your door out of the blue, asking if by any chance you'd be willing to sell your house (even though you have no for sale sign, and your house wasn't for sale) -- now that would be a sign. Especially if they said they  wanted to buy this house badly because it's close to the church they attend and that church is important to them.

I've had every vehicle I've ever owned - must be a few dozen - blessed asap after I bought it. My house and property have been blessed, my dogs have been blessed, so no, they do not only bless sacramentals. I don't see why he wouldn't bless your computer.

This reminds me of one of my sedevacantist friends. One day he brought a plastic crucifix to Mass that he had bought and a woman there thought it was beautiful and asked if she could see it. She held it and looked at it and then gave it back. A little while later my friend's crucifix broke and he thought that it was a sign from God. According to him the reason the crucifix broke was because the woman who wanted to see it and touched it supported Father Gruner and because she supported Father Gruner who was in his mind a notorious heretic, God allowed the crucifix to break to show his displeasure with Father Gruner. So my friend saw God's hand in action.

If your tire went flat, it means that a sharp object penetrated it, or that your tire tread wore too low and the tire was ready for replacement. If your tire went flat, it means that you need a new tire -- not that God is displeased with the destination from which you were leaving, or to which you were going.

Well, it depends on the person and the circuмstances.  If someone were going to a party and were probably going to get drunk and their conscience was bugging them about it, then the flat tire would be an actual grace for them to have more time to amend their plans.

If a person was just going to the grocery store and their tire went flat, maybe God intervened and saved them from some unforseen traffic accident...one they will never know they were saved from.

Or, maybe the flat tire is just an opportunity to practice patience.

Many people put bad interpretations on this stuff and I think that's what you're getting at, and I agree.  But, I believe that any and all circuмstances are allowed by God in our lives, even in the most minute details.  I agree that we must INTERPRET these things practically, but there's something Catholic about seeing the Hand of God in everything we do, as we should always be practicing His Divine Presence in our lives.

Many people put bad interpretations on this stuff and I think that's what you're getting at, and I agree.  But, I believe that any and all circuмstances are allowed by God in our lives, even in the most minute details.  I agree that we must INTERPRET these things practically, but there's something Catholic about seeing the Hand of God in everything we do, as we should always be practicing His Divine Presence in our lives.

Yes, but often God's providence is inscrutable, and hard for us limited humans to understand. Getting in the habit of ALWAYS being able to see God's specific reason for each occurrence is an exercise in futility. Plenty of times we're going to hit a brick wall.

Since we are taught to "do what we can, and pray for the rest" that means then whenever we get a flat tire, we shouldn't worry about its supernatural meaning. Go to the tire shop and get a new one. Unless the case is obvious, as you illustrate. But just because your tire goes out on the way to visit your boyfriend/girlfriend doesn't mean God is trying to tell you that he/she is wrong for you. That would be superstition.

Every time my kids bump their heads or get hurt, I don't regale them with, "maybe God is trying to tell you something." In fact, I never say that phrase. I intentionally struck that phrase from my speech. That teaches them that God is petty and vindictive, and it certainly encourages a superstitious, dark view of who God is. My mom said that plenty of times to me -- I might have been happily playing and laughing, and someone bumped their head or something. I'm sorry, but God doesn't vindictively strike children while they're playing. Not even if they're committing a venial sin of disobedience while doing so. If God were that proactive (in this life) striking and punishing sinners, then Hillary Clinton would have been dead years ago!

Speaking of all this talk about tires --
I just noticed a lot of cracking on one of my front tires yesterday, when I was checking the air on our tires. On our main vehicle, at that. I'm about to take a 3.5 hour trip (one-way) to Houston this weekend for Confirmations with Bishop Thomas Aquinas. Good thing I noticed it -- I wouldn't want my tire to collapse/blowout 200 miles from home. I'll be replacing it today.

 The point is not to try to understand, but to praise God in any and all circuмstances, for many, many, many times, what we view as a negative occurrence is actually a blessing.  

Remember 911
A man cut his finger and stopped to buy a bandaid and was late for work in one of the towers
Another person woke up late because the alam didn't go off and missed his flight.
Someone else had a problem with a new pair of tight shoes that delayed him.

I'm sure they all praised God.