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Aumsville EF2 Tornado

Aumsville EF2 Tornado

  • EF2 category winds range from 111 to 135 mph -- Storm survey indicated 110-120 mph most probable in this tornado
  • 50 Structures Damaged
  • 30+ Large trees uprooted or snapped
  • 2 Minor Injuries
  • Entire Path Length 5 miles though tornado was not on the ground the entire length
  • Path Width approximately 150 yards

Timeline:

  • 11:46 AM NWS Radar detects a strong cell north of Stayton
  • 11:52 AM Report of 2 Ft diameter Fir tree down on Highway 22
  • 11:53 AM Issued Severe Thunderstorm Warning for the storm
  • 11:59 AM Emergency Personnel report they observed tornado in Aumsville with damage
  • 12:02 PM Tornado Warning Issued for the storm

Overview

On December 14, a cold low pressure trough over the Pacific Northwest generated showers and thunderstorms over the Portland CWA. A short wave (thought to be a gravity wave generated by a small offshore low that developed in the cold pool behind the main front) rotating through the trough increased convection southeast of Salem, OR shortly before noon. At 11:53 AM, a Severe Thunderstorm Warning was issued based on 88D radar signature combined with a report from the public of some downed trees. At 11:59 PM, the WFO received a report of a tornado touching down from the same convective cell and a Tornado warning was issued at 12:02 PM.

Radar image at 11:46 AM when storm was over Aumsville (Note: radar beam is about 5800 ft above the ground) Mesocyclone shear ~45 KT. Aumsville Tornado Radar Image

Radar Animation of the Storm (Click image for full 4 MB version)

Top Left is base reflectivity (0.5 degree angle)
Top right Storm Relative Motion (0.5 degree angle)
Home (in orange) is the location of Aumsville

Radar Animation

Boundary Interaction (Click image for full 10 MB version)

Radar Animation

Damage Photos

Damage Path
Nichols Plumbing
Aumsville Damage Photo 1
Aumsville Damage Photo 2
Aumsville Damage Photo 3
Aumsville Damage Photo 4
Aumsville Damage Photo 5
Aumsville Damage Photo 6
Aumsville Damage Photo 7
Aumsville Damage Photo 8
Aumsville Damage Photo 9

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