Tornado Forecast Models
Tornado forecast models: how GFS, NAM, HRRR, and other weather models predict severe weather potential.
Global Models
GFS (Global Forecast System) - US model, 6-hour cycles
ECMWF (European Model) - considered best for medium-range
GEM (Canadian Model) - similar to GFS
Long-range forecasting (5-7 days out)
Global coverage
Regional Models
NAM (North American Mesoscale)
Higher resolution than GFS
Better for severe weather
3-hour cycles
24-48 hour forecast horizon
High-Resolution Models
HRRR (High-Resolution Rapid Refresh)
1-hour cycles
Very high resolution
Excellent for tornado forecasting
Short-range severe weather
Model Ensembles
Multiple model runs
Probabilistic forecasting
Confidence intervals
Better uncertainty estimation
Modern forecasting standard
How Forecasters Use Them
Compare multiple models
Look at ensemble spread
Consider recent verification
Update forecasts as new data comes in
Combine with observations
Model Limitations
Cannot predict individual tornadoes
Storm-scale detail limited
Uncertainty in exact location
Rapid onset events difficult
Continued improvement
Try the interactive simulator
Place an EF0–EF5 tornado anywhere in the world and see modeled fatalities, structural damage, and economic loss based on real census data.
Launch simulator →Try the interactive simulator
Place an EF0–EF5 tornado anywhere in the world and see modeled fatalities, structural damage, and economic loss based on real census data.
Launch simulator →