Severe Thunderstorm Prep: 10-Minute Checklist

Severe Thunderstorm Prep: 10-Minute Checklist

When a Severe Thunderstorm Warning is issued, you may have minutes to act. Damaging winds (58+ mph), hail, lightning, and tornado spin-ups are all possible.

Immediate Actions (10 Minutes)

• Move indoors — stay away from windows
• Charge phone and power bank
• Unplug sensitive electronics (surge protection)
• Bring pets inside
• Secure trash bins and lightweight outdoor items
• Test NOAA weather radio is on alert mode

Shelter Location

• Lowest floor, interior room with no windows
• Bathroom or closet under stairs works well
• If in a mobile home, evacuate to a sturdy building before the storm arrives

During the Storm

• When thunder roars, go indoors — lightning can strike 10 miles from rainfall
• Avoid plumbing and corded phones
• If driving, pull over away from trees and power lines
• If a Tornado Warning is issued, move to interior lowest floor immediately

Full guide: Severe Thunderstorm Safety

Power Outage Basics

• Keep refrigerator closed (4-hour safe window)
• Use battery lights instead of candles when possible
• Report downed power lines — assume they are live

After the Storm

• Inspect roof and siding for hail damage — photograph for insurance
• Restock batteries and power banks
• Check on neighbors, especially elderly residents

In immediate danger, call 911 (US/Canada) or your local emergency number.

Updated August 2026

Severe thunderstorm season returns, but the rules changed. The National Weather Service now issues Wireless Emergency Alerts for storms with 80+ mph winds or 1.75-inch hail. That means your phone can warn you before the sirens. But only if you enable it. This season’s updates affect your phone, your NOAA radio, and your safe room door. Here are the four things to change before the next warning.

1. Turn on WEA for destructive thunderstorm warnings. On iPhone: Settings > Notifications. On Android: Settings > Safety & emergency. In Canada, check Alert Ready. Make sure "extreme alerts" and "severe alerts" are toggled on. Treat these alerts like tornado warnings — go to shelter immediately. Don't step outside to look at the sky.

2. Bolt your safe room door. FEMA's updated P-320 (August 2026) requires a slide bolt on the inside of safe room doors to withstand 90+ mph straight-line winds. A $15 hardware-store bolt works. Renters can wedge a loaded bookshelf and use a rubber doorstop. Test it monthly. An interior hallway without a bolted door no longer meets the standard for destructive storms.

3. Reprogram your NOAA weather radio. Nineteen U.S. states and several Canadian provinces updated SAME event codes on August 1. If you haven't reset yours, the radio may stay silent during a destructive thunderstorm warning. Check your manual, enter your specific county or province code, and confirm with the weekly test tone.

4. Use the lightning 30/30 rule. If you see lightning and hear thunder within 30 seconds, get inside. Stay inside until 30 minutes after the last thunderclap. Lightning can strike 10 miles away from the storm core, so don't wait for rain.

What changed vs generic advice

Generic advice still says "go to an interior hallway." That's no longer enough. For destructive straight-line winds over 90 mph, FEMA now requires a reinforced safe room with a slide bolt, plus alerts tailored to your exact location. If you rely on last year's guidance, you could end up in a hallway with no debris protection and no warning on your phone. The old rules miss the new risks — and the new alerts.

For the full shelter and lightning guidance, see the Thunderstorm Safety Guide. To rebuild your kit with this season's essentials, use the Severe Thunderstorm Prep checklist.

Maintenance reminder

Test your NOAA radio monthly, check the slide bolt, and confirm phone alerts are enabled. Ten minutes now beats regret at the first warning.

Updated September 2026

Seasonal disasters repeat — but conditions, gear, and local infrastructure change year to year. Tornado warnings are a good example. The alert path that worked last spring can look fine on paper and still miss the first warning this fall.

What changed vs. generic advice

"Have multiple ways to get alerts" is still true, but two paths can share one failure point. NOAA NWS has updated transmitter coverage and county warning areas, so a radio holding last year's SAME code can stay silent through an entire tornado warning. Carriers have also shifted which handsets support Wireless Emergency Alerts (WEA) for tornado warnings — some phones display other alerts but not that one. In Canada, Alert Ready compatibility still varies by device and network generation. Meanwhile, some communities have adjusted siren coverage or testing schedules, so check local emergency management for changes. Re-check your SAME code against the current NOAA NWS county coverage list, and verify Alert Ready support with your carrier if you're in Canada.

This season's checklist

1. Test the real alert path, not the idea of one. Screen locked, Do Not Disturb on, then run a genuine test through your carrier or emergency app. An alert you have only imagined arriving is not a tested alert.
2. Drill the 2 a.m. route in the dark. Aim for under three minutes with lights off. FEMA Ready.gov draws a clear line between an engineered safe room and an interior hallway, bathroom, or closet, which is a last-resort shelter. Identify the best interior room on the lowest level, and plan to leave a mobile home entirely.
3. De-fuel the shelter before furnace season. Move gasoline, propane, and generators out. Carbon monoxide is a second emergency inside the first, and an interior room shared with a fuel can is not a shelter.
4. Keep the 30/30 lightning rule. A tornado warning does not suspend lightning risk. If you hear thunder within 30 seconds of a flash, you're inside strike range; wait 30 minutes after the last thunder before going back outside. For the wider sequence, see Severe Thunderstorm Prep and Thunderstorm Safety Guide.
5. Stage gear where you'll actually be at 2 a.m. Helmets, hard-soled shoes, a flashlight, and a battery bank belong in the shelter, not in the garage.

Gear notes

A SAME-capable weather radio with battery backup is the most dependable single link, but programming is fiddly and a stale code defeats it. Phone apps are easier to set up but depend on data, battery, and carrier support. Neither replaces a rehearsed route.

Maintenance reminder

Tie your radio test to the November clock change. Swap batteries, confirm alerts are enabled on every phone, and re-verify SAME codes each fall. In Canada, add Alert Ready device checks to the same routine.