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Dec 10–11 2021 Quad-State EF4 Outbreak
Dec 10–11 2021 • EF4 • KY / TN / AR / MO • Mayfield corridor • 58 fatalities
Stage
1
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Initial parametric
⚠ Tornado & straight-line wind damage only — hail and derecho not included. Published benchmarks cover all perils.
Damage State
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Destruction
Severe
Moderate
Minor
None (<threshold)
Wind Contours (mph)
Color by
Damage state
Damage index (0–1)
Wind speed (mph)
Construction class
RCV estimate ($)
P(destruction)
RCV Estimate
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90% CI:
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Loss Breakdown
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Buildings by Tier
State
Count
%
vs prev
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Layers
Buildings (damage)
Tornado track
Wind speed contours
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OTHER EVENTS:
N. Dallas (Oct 2019)
Somerset–London EF4 (May 2025)
Lower Michigan (Mar 2026) →
Stage Timeline
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Stage 1 — Initial parametric
T+0h