VORTEX
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Tornado Warning vs Watch — What's the Difference and What to Do

VORTEX Explained

What is the difference between a tornado warning and a tornado watch?

A tornado watch means conditions are favorable for tornadoes to form in your area over the next several hours — stay alert and monitor the weather. A tornado warning means a tornado has been spotted or indicated by radar in your immediate area — take shelter now. Watches cover wide regions (multiple counties or even states) and last for several hours. Warnings cover small polygon-shaped areas and typically last 30-60 minutes. The Storm Prediction Center issues watches; local NWS offices issue warnings.

What is a tornado watch?

A tornado watch is issued by the Storm Prediction Center in Norman, Oklahoma. It means atmospheric conditions are favorable for tornadoes to develop somewhere within the watch area in the coming hours. The watch may cover several counties, an entire state, or parts of multiple states. Watches typically run for 4-8 hours.

A watch does not mean a tornado has been spotted. It means: prepare. Bring patio furniture inside. Charge your phone. Know where you'll go if a warning is issued. Stay near a TV, radio, or weather app that will alert you. Children should come inside; outdoor activities should pause.

SPC also issues a more dangerous version called a Particularly Dangerous Situation (PDS) tornado watch, which means a major tornado outbreak is expected. PDS watches are rare and almost always followed by strong-to-violent (EF3+) tornadoes somewhere in the watch area.

What is a tornado warning?

A tornado warning is issued by the local National Weather Service office covering the affected area. It means a tornado has been spotted by storm spotters or law enforcement, OR a strong rotating circulation has been detected by Doppler radar (a "radar-indicated tornado"). The warning area is a small polygon — usually a few miles wide and 10-30 miles long, projected ahead of the storm's track.

A warning means: take shelter immediately. Go to the lowest floor of a sturdy building, into an interior room with no windows. Cover yourself with mattresses, blankets, or a helmet. If you're in a mobile home, vehicle, or RV, leave for sturdy shelter — these structures offer almost no tornado protection.

Warnings typically last 30-60 minutes and update as the storm moves. They can be extended, downgraded to a tornado watch, or replaced with a different warning type (severe thunderstorm warning) depending on what the storm does.

How are tornado warnings delivered?

NWS warnings are pushed simultaneously to multiple delivery channels:

  • Wireless Emergency Alerts (WEA) — sent automatically to all cell phones in the warning polygon. No app needed. Free.
  • NOAA Weather Radio — broadcast on 162 MHz to all SAME-equipped receivers in the affected county.
  • Local TV and radio — interrupted with the Emergency Alert System (EAS) tone and a crawl/banner.
  • Outdoor sirens — sounded in counties that have them. Sirens are outdoor alerts; they're not designed to wake you indoors.
  • Weather apps — push notifications. Reliable during the day; silenced by Do Not Disturb at night.
  • Phone-call alert services like VORTEX Pro — place an actual phone call when a warning is issued, which can ring through Do Not Disturb once you enable Emergency Bypass for the number.

For the highest reliability — especially at night — layer multiple sources. WEA + a phone-call app + a NOAA weather radio is the configuration storm-prone communities use.

What about a Tornado Emergency?

A Tornado Emergency is an enhanced tornado warning issued by NWS for the most extreme situations: a confirmed large, violent tornado on a track toward a populated area. It's not its own product type — it's a tornado warning with stronger language ("LARGE AND EXTREMELY DANGEROUS TORNADO") embedded in the bulletin text.

Tornado Emergencies are rare and almost always associated with EF4 or EF5 tornadoes. The 1999 Bridge Creek-Moore F5, 2011 Joplin EF5, 2013 Moore EF5, and 2021 Mayfield EF4 outbreaks all triggered Tornado Emergency wording. If you receive a warning that uses these phrases, treat it with maximum urgency.

What should you do during each one?

Tornado watch:

  • Stay inside or near a sturdy building.
  • Charge your phone, fill water bottles, locate flashlights.
  • Know your shelter spot — interior room, lowest floor, no windows.
  • Bring mobile-home and outdoor pets to a permanent structure.
  • Keep a NOAA radio, app, or TV on for warning updates.

Tornado warning:

  • Take shelter now — interior room, lowest floor, no windows.
  • Cover yourself with a mattress, heavy blankets, or helmet.
  • If in a mobile home or vehicle, leave for a permanent building.
  • If no shelter is available, lie flat in a low spot away from cars and cover your head.
  • Stay sheltered until the warning is canceled or expires — not just until you stop hearing wind.

Frequently asked questions

What is the difference between a tornado watch and a tornado warning?
A tornado watch means conditions are favorable for tornadoes over the next several hours — stay alert. A tornado warning means a tornado has been spotted or is imminent in your area — take shelter immediately. Watches cover wide regions and last for hours; warnings cover small polygons and last 30-60 minutes.
Should I take shelter during a tornado watch?
Not yet. A watch means conditions are favorable but no tornado has been spotted. Use the watch period to prepare: identify your shelter, charge your phone, bring outdoor items inside, and stay near alert sources. Take shelter when a warning is issued or when you see a tornado.
What does PDS tornado watch mean?
PDS stands for Particularly Dangerous Situation. A PDS tornado watch is a more severe version of a regular watch, indicating that a major tornado outbreak is expected with the potential for long-track, strong-to-violent (EF3+) tornadoes. PDS watches are rare and historically have been followed by destructive outbreaks.
How long does a tornado warning last?
Tornado warnings typically last 30-60 minutes. They can be extended if the storm continues to threaten, downgraded if the threat dissipates, or replaced with a different warning type. Stay sheltered until the warning is canceled — not just until conditions seem to calm down.
What is a Tornado Emergency?
A Tornado Emergency is enhanced wording within a regular tornado warning, used by NWS when a confirmed large, violent tornado is on a track toward a populated area. It uses phrases like "LARGE AND EXTREMELY DANGEROUS TORNADO" and is reserved for the most severe situations — typically EF4 or EF5 tornadoes near cities.
Who issues tornado warnings?
Local National Weather Service forecast offices issue tornado warnings for the area they cover. There are 122 forecast offices nationwide. The Storm Prediction Center in Norman, Oklahoma issues watches but not warnings — watches and warnings are different products from different agencies.