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Updraft Helicity

Rotating storm updrafts simulated by high-resolution models.

HRRR updraft helicity map showing long rotating storm tracks across Illinois and Indiana
Run-to-hour maximum updraft helicity, 2–5 km AGL (m² s⁻²), from the HRRR model. Init: Fri 2023-03-31 06z.

What the map shows

Tracks of model storms that rotate — a supercell signal.

How to read the colors

Swaths or streaks; brighter colors show stronger rotation.

Common mistakes

  • Treating tracks as exact paths instead of areas of concern.

Key terms

SupercellConvection-Allowing ModelUpdraft Helicity
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