In simple terms, a tornado watch means conditions are favorable for tornadoes – think of it as an “early heads-up” – while a tornado warning means a tornado is happening or about to happen and you must act immediately. Under a watch, stay alert and prepare your safety plan; under a warning, seek shelter right away. Officially, the Storm Prediction Center issues watches when tornadoes could form, whereas local National Weather Service offices issue warnings when a tornado is sighted or detected on radar.
Tornado Watch: Be Prepared
A Tornado Watch is issued when atmospheric conditions are ripe for tornadoes (for example, strong thunderstorms with rotation might develop). Watches often cover very large areas (multiple counties or even states) and can last several hours. The message is: be ready. Use the extra time wisely by reviewing your emergency plans and supplies, identifying your safest shelter location, and staying tuned to weather updates. For example, the NWS advises under a watch to “review and discuss your emergency plans, take inventory of your supplies and check your safe room”. In short, a watch does not mean a tornado is occurring – it just means one is possible, so keep an ear on alerts (NOAA Weather Radio, smartphone apps or local media) and be prepared to move if a warning follows.
- Prepare your home and family: Review your safety plan (know where to shelter), check your emergency kit, and remind everyone what to do if a warning comes
- Stay informed: Keep radios or phones on for watches/warnings and weather forecasts. A watch can escalate quickly, so monitor the sky and updates from official sources
Tornado Warning: Take Shelter Now
A Tornado Warning means a tornado has been sighted or is indicated by radar and poses an imminent threat. Warnings come from your local NWS office and typically cover a much smaller area (a county or even part of a county) for a short time (often 20–60 minutes). The warning’s mantra is “Take action now!”. When a warning is issued for your area, don’t wait to verify – immediately go to your safest shelter. This usually means the lowest, most central room in a sturdy building (basement or interior hall) and staying away from windows. If you’re in a vehicle or mobile home, move to a nearby shelter or sturdy building as quickly as possible. Time is critical: most warnings give only about 10–20 minutes of lead time, so act at once.
- Go to safety immediately: Move to a basement or interior room on the lowest floor away from windows.
- Protect yourself: Crouch under sturdy furniture if possible, and cover your head with your arms, a helmet or heavy blanket to guard against flying debris.
- Wait it out: Remain sheltered until the warning expires or you’re told it’s safe. Do not leave early or investigate outside until the threat has clearly passed.
Frequently Asked Questions (FAQs)
- Who issues tornado watches and warnings?
Watches are issued by the NOAA Storm Prediction Center (SPC) when conditions are favorable over a large area. Warnings are issued by your local National Weather Service forecast office when a tornado is observed or indicated. In other words, SPC says “be ready” regionally, and local NWS says “take cover” specifically where the threat exists. - Does a tornado watch mean a tornado is definitely coming?
No. A watch means tornadoes are possible, not certain. It’s an alert to stay alert – review plans and keep an eye (and ear) on weather updates. Only a warning confirms a tornado is occurring or imminent. - What should I do when a tornado warning is issued?
Immediately move to your pre-identified shelter (basement or interior room) and protect yourself as described above. Do not try to outrun a tornado in a car or stay in a mobile home. Keep listening for updates – most warnings last less than an hour, but only leave safety when officials say it’s over. - How large of an area and time span do watches vs. warnings cover?
Watches often cover many counties or states and can last several hours. Warnings cover a much smaller area (often just the path of one storm across a county or two) and usually last 20–60 minutes.
The takeaway: Watches = large area, hours. Warnings = small area, minutes.