It was a wild weather day on Thursday with rain, sleet, freezing rain, snow, and hail reported in Iowa. The featured graph is a timeseries from the Wall Lake SchoolNet site showing what appears to be a gravity wave signature. The oscillation of wind direction and pressure is indicative of the changes as the wave crests and troughs pass by the station.

Voting:
Good = 40
Bad = 18

Tags:   gravitywave  

It would appear that a gravity wave transversed the state late Sunday afternoon based on the plot shown and a number of sites reporting dramatic pressure falls. The featured plot maps 1 hour pressure falls with NEXRAD reflectivity at 8:10 PM Sunday night. Notice the area of pressure falls (red) and rises (blue) behind the line of low reflectivities. If you have any comments about this, please let us know.

Voting:
Good = 14
Bad = 7

Tags:   gravitywave