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.
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 (it appeared to skip)
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