Atmopheric Scientists at CSU attempt to figure out why TUTT weather system acts differently over NAM region

There is a weather system, the tropical upper-tropospheric troughs (TUTTs) that usually increases rainfall on its eastern edge, when it’s over the Pacific and Atlantic Oceans.

When the TUTTs occurs over the north American monsoon (NAM) region, also known as the Mexican monsoon region, there is increased rainfall on its west side as it moves over the mountains in Mexico.

Our University affiliates worked to pinpoint the direct cause of the odd rainfall pattern.

Andrew Newman, now at the National Center for Atmospheric Research was one of our students and worked with Richard H. Johnson in the Department of Atmospheric Science on this project.

They simulated the NAM TUTTs and measured the results. They compared the results to a July 12-13, 2004 event with the intention of replication.

They found that most likely the wind shears in the 700-400 hPa and Sfc-hPa layers resulted in the odd pattern.

This is not conclusive though because we were not able to exactly replicate the event. This is a good direction for future research.

As far as I can tell, the layers in question are somewhere in the middle of the atmospheric disturbance (not at the upper level or underneath). Can somebody translate the 2 layers into English for me? Please?