Storm Events Database

Event Details

Event Thunderstorm Wind
Magnitude 50 kts.
State IDAHO
County/Area BENEWAH
WFO OTX
Begin Date 12/29/2011 00:30:00 PST-8
Begin Range 0
Begin Azimuth N
Begin Location ST MARIES
Begin Lat/Lon 47.32/-116.58
End Date 12/29/2011 01:00:00 PST-8
Deaths Direct/Indirect 0/0 (fatality details below, when available...)
Injuries Direct/Indirect 0/0
Property Damage 10.75K
Crop Damage 0.00K
Episode Narrative On the evening of the 28th into the early morning hours of the 29th, a low-level jet developed over the Idaho Panhandle ahead of a strong low pressure system tracking along the Washington / Canadian Border. Through midnight, the strong low-level winds remained decoupled from the valley floors with high wind gusts measured only along exposed ridgetops. Around midnight, a line of thunderstorms developed along the trailing cold front. A combination of descending air within the thunderstorm downdrafts along with terrain channeling was thought to be responsible for mixing the stronger winds aloft down to some valley locations within the Central Panhandle Mountains of Idaho. There were two reports of large trees toppled by these winds. Wind gusts within the zone ranged from 30 to 60 miles per hour with gusts near 60 miles per hour thought to be present where the trees were downed.
Event Narrative The St Maries COOP reported a tree had fallen onto power-lines in the Benewah Valley due to strong wind gusts associated with thunderstorms between 1230 AM PST and 100AM PST.


All events for this episode:

Location County/Zone St. Date Time T.Z. Type Mag Dth Inj PrD CrD
Totals: 0 0 208.75K 0.00K
ST MARIES BENEWAH CO. ID 12/29/2011 00:30 PST-8 Thunderstorm Wind 50 kts. EG 0 0 10.75K 0.00K
OSBURN SHOSHONE CO. ID 12/29/2011 00:45 PST-8 Thunderstorm Wind 60 kts. EG 0 0 198.00K 0.00K
Totals: 0 0 208.75K 0.00K