Loading the replay

Quad-State tornado outbreak, Dec 10–11, 2021

1 of 2 · The storm's data
forty°seventy

Quad-State tornado outbreak, Dec 10–11, 2021

Quad-State tornado outbreak, Dec 10–11, 2021

Chapter 1 · Watches

Tornado Watches go up across the mid-South.

By mid-afternoon, NWS Paducah, Little Rock, Memphis and St. Louis have Tornado Watches in effect.

18:00UTC · Fri, Dec 10, 2021 · 12:00 PM CST

Space play/pause · ←/→ 10 min · Enter opens a link

Replay of past events. For current weather and warnings, see weather.gov. Links are rule-based facts. About and credits

Replay · TO20211210

Quad-State tornado outbreak: the story

Dec 10, 18:00 UTC – Dec 11, 12:00 UTC. Radar, severe thunderstorm and tornado warnings, storm reports and ground stops, in order, with 497 links that show their evidence.

  • 472 NWS warnings
  • 618 storm reports
  • 1 FAA airport programs
  • 67 surveyed tornado tracks
  • 497 rule-based links
  • 137,862 customers out at the peak, in Tennessee
  • 541 radar frames

Watches

Dec 10

By mid-afternoon, NWS Paducah, Little Rock, Memphis and St. Louis have Tornado Watches in effect.

Replay from here

First warnings

Dec 10–11

  1. NWS Paducah, KY issues the first Tornado Warning.Replay from here
  2. The largest hail reported: 2 in at Bogata, TX.Replay from here

Mayfield

Dec 11

  1. NWS Memphis, TN declares a tornado emergency.Replay from here
  2. The strongest tornado, an EF4, touches down: a 166 mi track.Replay from here
  3. The strongest measured gust: 107 mph at 4 NNE Wingo, KY.Replay from here
  4. NWS Paducah, KY declares a tornado emergency.Replay from here
  5. NWS Paducah, KY declares a tornado emergency.Replay from here
  6. NWS Paducah, KY declares a tornado emergency.Replay from here
  7. NWS Paducah, KY declares a tornado emergency.Replay from here
  8. NWS Paducah, KY declares a tornado emergency.Replay from here
  9. NWS Paducah, KY declares a tornado emergency.Replay from here

Overnight

Dec 11

  1. Peak outages: 137,862 customers out of power in Tennessee. The most in one county: Davidson County, TN, 83,500 out (23% of its customers) at 11:45 UTC.Replay from here

How we link records

RuleWhat it checksLinks
R4 solidA storm report inside a warning polygon while it was in effect465
R6 solidA surveyed tornado track that began inside a Tornado Warning, with the warning's lead time32

Solid lines mark rules that passed an independent check; dashed lines are context. Links are rule-based facts: each shows two records that overlap in place and time. How we know

Where this storm's data comes from

Every layer, the provider behind it and the period it covers.

LayerProviderPeriodRecords
MRMS SeamlessHSRNOAA/NSSL via Iowa Environmental MesonetDec 10, 18:00 UTC – Dec 11, 12:00 UTC541
NWS storm-based warning polygonsNOAA National Weather Service via Iowa Environmental MesonetDec 10, 18:00 UTC – Dec 11, 12:00 UTC472
NWS Local Storm ReportsNOAA National Weather Service via Iowa Environmental MesonetDec 10, 18:00 UTC – Dec 11, 12:00 UTC618
FAA airport programs (ground stops and ground delay programs)FAA Air Traffic Control System Command CenterDec 10, 18:00 UTC – Dec 11, 12:00 UTC1
ORNL EAGLE-IOak Ridge National LaboratoryDec 10, 18:00 UTC – Dec 11, 12:00 UTC686
  • Radar: NOAA/NSSL MRMS SeamlessHSR, via the Iowa Environmental Mesonet (IEM), Iowa State University
  • Warnings: NOAA/NWS, storm-based polygons via the Iowa Environmental Mesonet
  • Storm reports: NOAA/NWS Local Storm Reports via the Iowa Environmental Mesonet
  • Airport programs: FAA Air Traffic Control System Command Center
  • Tornado tracks: NOAA/NWS Damage Assessment Toolkit damage surveys
  • Power outages: Oak Ridge National Laboratory, EAGLE-I (CC BY 4.0)
  • County boundaries: U.S. Census Bureau