Significant tornado parameter

The Significant Tornado Parameter highlighting a risk for tornadoes across Mississippi and Alabama on March 15, 2025

The Significant Tornado Parameter, often abbreviated as STP or SigTor,[1] is a composite index used by the Storm Prediction Center to highlight areas across the United States where multiple ingredients for the development of tornadic supercells overlap,[2][3][4][5] and the capability of potential tornadic supercells producing "significant" tornadoes of EF2 intensity or higher.[6] Values greater than 1 indicate an increased potential of significant tornadoes.[7]

Equation

The equation used to calculate the parameter is as follows:[8]

STP = ⁠MLCAPE/1500 J/Kg^-1⁠ x ⁠2000-mlLCL/1000 m⁠ x ⁠ESRH/150 m^2 s^-2⁠ x ⁠EBWD/20 m/s^-1⁠ x ⁠200+mlCIN/150 J/Kg^-1⁠

See also

References

  1. ^ "Significant Tornado Parameter (STP)". NOAA. Retrieved 2025-04-21.
  2. ^ Thompson, Rich. "EXPLANATION OF SPC SEVERE WEATHER PARAMETERS". Storm Prediction Center. Retrieved 2025-04-21.
  3. ^ US Department of Commerce, NOAA. "Is tornado frequency increasing in parts of the U.S.?". National Weather Service. Retrieved 2025-04-21.
  4. ^ "Significant Tornado Parameter (with CIN) Stats". National Weather Service. Retrieved 2025-04-21.
  5. ^ "Forecasting severe convective storms". European Storm Forecast Experiment. Retrieved 2025-04-21.
  6. ^ "Mid-Century Significant Hail and Tornado Potential". Guy Carpenter. Retrieved 2025-04-21.
  7. ^ "Convective Parameters - SigTor". National Weather Service. Retrieved 2025-04-21.
  8. ^ "Warning Methodology - Screen, Rank, Analyze, Decide (SRAD)" (PDF). National Weather Service. p. 9. Retrieved April 21, 2025.


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