Severe Weather Alert Checklist: What to Do Before, During, and After a Storm

Overview

Severe weather can develop faster than a normal weather forecast suggests, especially when thunderstorms, tornadoes, flooding, winter storms, high winds, extreme heat, or coastal hazards are involved. A practical response starts with three questions: What hazard is being reported? How close is it to my location or route? What action is needed now?

A watch generally means conditions are favorable for a particular hazard, so you should review your plan, monitor updates, and be ready to act. A warning generally means the hazard is occurring, imminent, or detected in a specific area. Treat a warning as an instruction to take protective action immediately. Terminology and alert procedures can vary by location and hazard, so read the complete message and follow local emergency guidance.

Use more than one way to receive information. A local alert system, weather app, radio, television, or official weather service can provide updates, while weather radar can help you understand where precipitation and storm activity are moving. Radar is useful for context, but it should not replace an official warning or an instruction from emergency authorities. For a refresher, see how to read a weather radar and how to read a weather radar map.

Checklist by scenario

Before a storm or during a watch

• Confirm your exact location, including the neighborhood, hotel, campsite, airport, or road segment where you will be.
• Check the local forecast, hourly weather, radar, and severe weather alerts rather than relying on a single daily forecast.
• Identify the safest shelter. At home, this is usually a sturdy interior room away from windows; in a hotel, ask staff where guests should go; outdoors, identify substantial buildings before conditions worsen.
• Charge phones, battery packs, flashlights, and other essential devices. Keep a battery-powered or hand-crank method of receiving information if available.
• Bring in or secure loose outdoor items such as chairs, bins, signs, sports equipment, and camping gear.
• Gather water, necessary medicines, basic first-aid supplies, sturdy shoes, identification, and copies of important contact information.
• Tell a household member, travel companion, or group leader where you will shelter and how you will communicate if phone service is disrupted.
• Review evacuation routes if flooding, wildfire, coastal surge, or another hazard could require leaving. Do not wait until roads are difficult to use.

When a warning is issued

• Stop outdoor activities, driving plans, sightseeing, and nonessential travel until you understand the hazard and the recommended action.
• Move to the designated shelter immediately. For strong winds or tornado threats, use a small interior room on the lowest practical level and stay away from windows.
• For lightning, leave open areas, beaches, sports fields, and elevated locations. A substantial enclosed building or hard-topped vehicle is safer than remaining outside.
• For flooding, move to higher ground and never walk or drive through water of unknown depth or moving water.
• For winter weather, avoid unnecessary travel, keep warm layers and supplies accessible, and be cautious around power lines and falling branches.
• For extreme heat, move to a cooler location, reduce exertion, and check on people or animals who may be more vulnerable to heat.
• Keep monitoring updates, but do not delay sheltering while trying to determine whether the storm will pass nearby.

For travelers, airport passengers, and outdoor groups

Before departing, compare the destination weather forecast with conditions along the route and at the return point. A pleasant forecast at the destination does not eliminate risks from storms, mountain weather, flooding, smoke, or airport disruptions along the way. Check airport weather and airline or airport updates before leaving for the terminal, and allow a backup plan if thunderstorms, snow, strong winds, or low visibility affect operations.

Outdoor groups should establish a turnaround time and a shelter destination before starting. Do not use a weak cell signal or a weather app's lack of an alert as proof that conditions are safe. Campers should secure tents and equipment early, while beach visitors should leave the water and exposed shoreline when lightning, strong winds, dangerous surf, or a storm warning affects the area. Related planning checklists for camping and beach conditions can help identify risks before departure.

After the storm

• Wait for the warning to expire or for local authorities to indicate that it is safe before leaving shelter.
• Watch for secondary hazards, including downed power lines, unstable trees, broken glass, flooded roads, debris, gas leaks, and damaged buildings.
• Do not touch fallen wires or use electrical equipment that has been exposed to water.
• Check on household members, neighbors, and group participants without entering unsafe structures.
• Use text messages when possible if networks are congested, and conserve phone battery for essential communication.
• Photograph damage only from a safe location and follow local instructions about cleanup, travel, and recovery.

What to double-check

Alert messages can change as a storm moves, so verify the details instead of reacting to a headline alone. Check the hazard type, affected area, start and end times, expected movement, and the recommended action. Confirm whether your current location, planned route, or destination is inside the alert area. Location services can be imprecise, particularly near county, state, or national borders.

Double-check your shelter's practical condition. It should be accessible, not dependent on an elevator during a power outage, and large enough for everyone in your household or group. Make sure pets, mobility devices, infant supplies, and essential medicines can reach the shelter with you. If you are in a hotel, rental, campground, or unfamiliar city, ask staff or local authorities about the designated shelter before an alert becomes urgent.

Review health and environmental factors as well. Smoke, poor air quality, heat, and humidity can make outdoor activity unsafe even after rain has stopped. Our guide to air quality and weather covers how changing conditions can affect plans. If your trip involves snow or mountain terrain, also check the ski weather checklist for conditions beyond the basic precipitation chance.

Common mistakes

• Confusing a watch with permission to continue. A watch is preparation time. It is the point to secure equipment, locate shelter, and adjust plans.
• Waiting for visual confirmation. Dark skies, rain, or a nearby siren are not required before taking action on a warning.
• Using radar as a guarantee. Radar displays changing weather patterns, but it cannot replace official alerts, local instructions, or direct observations of dangerous conditions.
• Driving into floodwater. Water can conceal washed-out roads, debris, and submerged hazards. Choose a different route or remain sheltered.
• Leaving shelter too soon. A brief lull may be the quiet center of a storm, and hazards can continue after the heaviest rain or wind passes.
• Planning only for the primary hazard. A storm can create follow-on problems such as flooding, power loss, blocked roads, extreme heat, or poor air quality.
• Relying on one device or one person. Shared plans, backup power, and more than one information source make a response less fragile.

When to revisit

Review this checklist at the start of each severe weather season, before a long trip, and whenever your household, travel group, workplace, or outdoor routine changes. Recheck it when you move, change lodging habits, add a family member or pet, purchase new equipment, or learn that local alert and evacuation procedures have changed.

Before every outing, perform a short three-minute review: check the current forecast and alerts, identify the nearest suitable shelter, and tell someone what your backup plan is. For destination planning, use a weather-by-month climate guide to understand seasonal hazards, then check the live forecast shortly before departure. Conditions can change even when the broader seasonal pattern is familiar.

Save this checklist where you can reach it offline, add local emergency contacts, and write down your household meeting place. The goal is not to predict every storm perfectly. It is to make the safest reasonable decision early, before travel, communication, and shelter options become limited.