Severe weather can change quickly, so understanding watches and warnings helps people make safe decisions before conditions become dangerous. A watch means the ingredients for severe weather are present, so you should be ready and pay attention. A warning means dangerous weather is happening or about to happen, so you should take action immediately.
Knowing the difference can protect families, schools, and communities from injuries and property damage.
Meteorologists use radar, satellite images, weather stations, and storm reports to decide when to issue alerts. Watches often cover large areas and last for several hours because they describe a risk that may develop. Warnings usually cover smaller areas and shorter time periods because they point to a specific hazard such as a tornado, flash flood, or severe thunderstorm.
Preparedness connects earth science to health and safety because good information only helps if people know how to respond.
Key Facts
- Watch = Be Ready: conditions are favorable for severe weather to form.
- Warning = Take Action: severe weather is occurring, has been spotted, or is indicated by radar.
- Severe thunderstorm criteria often include wind speed 58 mph or higher, hail 1 inch or larger, or a tornado risk.
- Tornado warning safety rule: go to a basement or an interior room on the lowest floor, away from windows.
- Flash flood safety rule: Turn Around, Don’t Drown, because 6 inches of moving water can knock a person down.
- Preparedness kit guideline: store at least 1 gallon of water per person per day for emergencies.
Vocabulary
- Watch
- A watch is an alert that severe weather is possible because the right conditions exist.
- Warning
- A warning is an alert that severe weather is happening or expected soon in a specific area.
- Radar
- Radar is a tool that sends out radio waves to detect precipitation, storm movement, and some signs of rotation.
- Safe shelter
- A safe shelter is a protected place such as a basement, storm shelter, or small interior room away from windows.
- Emergency kit
- An emergency kit is a set of supplies such as water, food, flashlight, batteries, first aid items, and important information.
Common Mistakes to Avoid
- Treating a watch like nothing is wrong is a mistake because a watch means severe weather could develop and you need to prepare.
- Waiting for visible danger before acting on a warning is a mistake because storms, tornadoes, and floods can arrive faster than they can be seen.
- Standing near windows to watch the storm is a mistake because flying glass and wind-blown debris can cause serious injuries.
- Driving through flooded roads is a mistake because water depth and road damage are hard to judge, and moving water can sweep vehicles away.
Practice Questions
- 1 A school receives a severe thunderstorm watch from 2:00 p.m. to 8:00 p.m. How many hours should students and staff stay alert for possible severe storms?
- 2 An emergency plan says to store 1 gallon of water per person per day. How many gallons are needed for a family of 4 for 3 days?
- 3 A tornado warning is issued while students are in a classroom with large windows. Explain where they should go and why that location is safer.