I learned this lesson the hard way in 2019. A summer thunderstorm rolled through while I was at work, and by the time I got home, my desktop computer was dead. So was the monitor. So was the router. The TV in the living room still turned on but had a weird flickering bar across the bottom of the screen that never went away. Total damage? Somewhere north of $2,500. And the kicker — my surge protector’s little green “protected” light was still on. It just didn’t matter.
So here’s what I wish someone had drilled into my head years ago: your computer is the single most important thing to unplug before a storm. Not your toaster. Not your lamp. Your computer. And I’m going to explain exactly why, plus everything else you should know about protecting your home when the sky turns ugly.
Why Your Computer Is the #1 Priority
Every appliance in your home has some level of risk during a storm, but your computer is in a league of its own. Here’s why: it’s packed with incredibly sensitive components — processors, RAM, solid-state drives, graphics cards — all built with millions of tiny transistors that can be destroyed by voltage spikes lasting just milliseconds. A toaster can take a hit and keep toasting. A computer takes a hit and becomes a paperweight.
But it’s not just the hardware. It’s everything stored on it. Family photos, tax documents, work files, passwords — all of that can disappear in the time it takes lightning to travel from cloud to ground (about one millisecond, by the way). Even if you have backups, recovering from a fried computer is a weeks-long headache nobody wants.
And here’s something most people don’t realize: turning your computer off doesn’t protect it. The power surge from a lightning strike is strong enough to jump right over the tiny gap between the contacts in a power switch. Off or on, if it’s plugged in, it’s vulnerable. Period.
Your Surge Protector Isn’t as Good as You Think
I know what you’re thinking: “But I have a surge protector.” So did I. Look, a decent surge protector from Home Depot or Walmart — something in the $25 to $50 range — does help with everyday power fluctuations. Your A/C kicks on and sends a little spike through the wiring? The surge protector handles that. A minor grid hiccup from the power company? Covered.
Lightning is a completely different animal. A lightning strike generates roughly 15 million volts. Your home’s electrical system is designed for 120 volts with a peak of 169 volts. Your $30 surge protector strip is not 100 percent effective against that kind of energy. A big enough surge will blow right past it. And even if the surge protector absorbs some of the hit, it’s probably damaged afterward and won’t protect you next time — even if the indicator light still says “protected.”
Think of a surge protector like a seatbelt. Better than nothing? Absolutely. But you still wouldn’t drive into a brick wall on purpose just because you’re buckled up.
The Cable Line Trick Nobody Talks About
Here’s something that catches a lot of people off guard. You can unplug your TV and computer from the electrical outlet and still have them get fried. How? The coaxial cable from your cable TV or internet provider. That cable runs from a pole or underground line into your home and connects directly to your modem, router, or TV. Lightning can travel through that cable line and damage anything connected to it — even devices that aren’t plugged into power at the time.
One electronics technician reported seeing a TV that was unplugged from power but still connected to a cable line. Lightning hit near the cable company’s equipment, traveled through the coaxial cable, and fried the TV’s input circuitry. The TV wasn’t even “on.” It was just physically connected to that cable.
So when you unplug your computer and TV before a storm, disconnect the cable/internet lines too. Same goes for ethernet cables running to your desktop. It takes 10 extra seconds and could save you hundreds of dollars.
What Else to Unplug (in Order of Priority)
Your computer is priority number one. But if you have a couple of minutes before the storm hits, here’s what to unplug next, in order of how expensive or painful it would be to replace:
Gaming consoles. A PS5 runs $500. An Xbox Series X is $500. These have the same sensitive circuitry as computers. Pull the plug and disconnect any HDMI or network cables.
Your TV. Modern smart TVs are basically big, flat computers. A 65-inch set can cost $600 to $1,500 depending on the brand. Disconnect it from both power and cable/satellite lines.
Phone and laptop chargers. These act as a bridge between the wall outlet and your device. If your phone is plugged into a charger and a surge comes through, it can travel right into your phone. Unplug the charger from the wall. (If your laptop or phone is running on battery and not connected to anything, it’s safe.)
Small kitchen appliances. Microwaves, coffee makers, toaster ovens — anything with a digital display or circuit board. These aren’t as expensive individually, but replacing three or four of them adds up fast.
Smart home devices. Smart speakers, smart thermostats, Wi-Fi cameras — they all have delicate electronics inside.
What to Leave Plugged In
Your refrigerator. I know it seems like you should unplug everything, but your fridge needs to keep running to prevent food spoilage, and unplugging and replugging it repeatedly isn’t great for the compressor. This is one of those cases where the risk of storm damage is worth accepting.
Your modem and router — maybe. This one is a judgment call. If your phone gets weather alerts, you can probably unplug the router. But if your only source of storm updates is a Wi-Fi-connected device, it might be worth keeping the modem running so you stay informed, especially during tornado season. Just know you’re accepting the risk.
The “I’m Not Home” Problem and How to Fix It
The obvious problem with “just unplug everything” is that storms don’t wait for you to get home from work. The Insurance Information Institute reported almost 61,000 homeowners insurance claims for lightning damage in 2021, with an average payout of more than $21,000 per claim. A lot of that damage happened while people were away.
This is where a whole-house surge protector earns its keep. It gets installed directly at your electrical panel by a licensed electrician and intercepts surges before they spread through your home’s wiring. A good one costs between $200 and $500 installed. Compare that to $21,000 in average lightning claim damage and the math is pretty obvious.
Look for a unit that meets UL 1449 standards, rated as Type 1 or Type 2, and can handle at least 40,000 amps of surge current. Eaton, Siemens, and Leviton all make solid whole-house models. You can buy them at Home Depot for $80 to $150 for the unit itself, then pay an electrician $100 to $300 to install it. One afternoon, one bill, and you’re covered 24/7 whether you’re home or not.
That said — and I want to be crystal clear about this — no surge protection system can guarantee 100 percent protection against a direct lightning strike. A whole-house protector is your best passive defense, but unplugging is still the gold standard when you’re actually home.
Timing Matters More Than You Think
Here’s a detail that trips people up: you need to unplug before the storm arrives, not during it. Once lightning is striking near your home, it’s unsafe to touch power cords or outlets. If you’re reaching for a plug while lightning is hitting your neighborhood, you could be the path electricity takes to ground.
Use the 30-30 rule: if you count fewer than 30 seconds between seeing lightning and hearing thunder, the storm is close enough to be dangerous. That’s your cue to start unplugging — quickly and calmly. And after the storm passes, wait 30 minutes after the last flash of lightning before plugging things back in.
Set up weather alerts on your phone. Most weather apps let you enable push notifications for severe thunderstorm warnings in your area. That 15 to 30 minutes of advance notice is usually enough time to do a quick walk-through and unplug the important stuff.
A Simple Storm Prep Checklist
Print this out and stick it on your fridge. When a storm warning pops up on your phone, run through the list:
1. Unplug your desktop computer, monitor, and speakers. Disconnect the ethernet and any USB peripherals.
2. Unplug gaming consoles and disconnect HDMI cables.
3. Unplug your TV and disconnect the coaxial cable from the wall.
4. Unplug phone and laptop chargers from the wall (your devices are fine on battery).
5. Unplug small kitchen appliances with digital displays.
6. Unplug smart home devices and Wi-Fi cameras.
7. Leave the fridge plugged in.
8. Decide on the modem/router based on your need for weather updates.
9. Stay away from outlets and plumbing until the storm passes.
The whole process takes about five minutes once you’ve done it a couple of times. That five minutes can save you thousands. And if you want to back yourself up for the times you’re not home, spend the $300 to $500 on a whole-house surge protector and stop worrying about it.
Storms are going to happen. Your stuff doesn’t have to suffer for it.
