What is High Risk?
A High Risk designation is the most severe classification in the Storm Prediction Center’s (SPC) severe weather outlooks. It signifies a major outbreak of severe thunderstorms, with a strong focus on long-track, violent tornadoes. This classification is reserved for days when meteorological conditions suggest a high probability of destructive tornadoes, widespread damaging winds, and large hail.
High-risk outlooks are rare, typically issued only a few times per year, and often coincide with historic tornado outbreaks. When a high-risk day is forecasted, residents in the affected areas must be extra vigilant and have a storm shelter or safe room ready for immediate use.
Key Indicators of a High-Risk Tornado Event:
- Strong wind shear and a highly unstable atmosphere.
- Tornado-favorable conditions such as warm, moist air colliding with dry, cool air.
- Supercell thunderstorms capable of producing EF3 to EF5 tornadoes.
- Meteorological consensus that severe weather is inevitable.
Why High-Risk Days Require Immediate Action:
During a high-risk event, lives and property are at extreme risk. Experts strongly urge people to:
- Monitor weather updates closely.
- Seek safe shelter early rather than waiting for sirens.
- Have emergency supplies in a storm shelter or safe room.
- Ensure family and community members are aware of the severe weather threat.
If you live in a tornado-prone region, investing in a storm shelter can be the best way to ensure safety during high-risk tornado events.