Past IEM Features tagged: bore

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Undular Bore

02 May 2017 05:35 AM
The powerful storm system that brought tornadoes, heavy snowfall, and flooding rains to the US this past weekend also produced an undular bore over Iowa on Sunday evening. These events are not atypical of strongly forced storm systems and typically are harmless only producing neat cloud features and shifts in wind speed, direction and air pressure. The featured plot presents 1 second interval data from the "Hamilton County" ISU Tall Towers site whose data will be featured on this website more prominently soon. The data shown is for the 10 meter above ground sensor and shows the jump in pressure associated with the bore and then oscillation afterwards. The drop in wind speed and shift to southwesterly is interesting to see.

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Tags:   bore   talltowers  


04 Oct 2007 06:38 AM
So much happened on Tuesday that it is filling two days worth of features! This webcam image was taken from the Saylorville Lake webcam on Tuesday morning, you can see clearing on both sides of the cloud that is moving to the east. This feature is showing the wave motion in the atmosphere with downward motion (trough) in the clear area and upward motion (crest) where the cloud is. The experts are still looking at the data from this event, but early indications are that it was a bore! You can view webcam lapses from Tama, Indianola, and Saylorville Lake.

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Tags:   bore   webcam