REFS · Model Forecast

HRRR Structure Index (F01-F18)

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HRRR Structure Index

REFS · Forecast

0255075100

About this field

Per-fhour HRRR deterministic 0-100 photogenic-supercell composite through the 18-hour forecast horizon. Higher means deeper streamwise rotation and a thermodynamic profile favoring sculpted storm structure.

Outlook overlays SPC Convective SPC Fire WPC Excessive Rainfall WPC Winter / WSSI

Model refresh

Every 6 hours. Ensemble guidance through forecast hour 60 on every cycle and through hour 72 on the 00Z cycle. Fields are probabilities across ensemble members, so higher values mean the atmospheric setup is more agreed-upon by the ensemble.

Use with care

Model output is guidance, not a warning. Follow official National Weather Service information for life-safety decisions.

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