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INFORMATIONCOURTESYNATIONALWEATHERSERVICE

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

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