The Los Angeles Morning Glory
The Gulf of Carpenteria region of Australia is well known for spectacular sets of roll
clouds that sometimes form, especially in the morning. This beautiful atmospheric
condition has come to be known as the "Morning Glory" (see picture, courtesy of
). A change in pressure accompanies these clouds, thus making it
possible to detect them with barometers.
It turns out that long-period seismometers are sensitive to the ground tilt that results
from pressure changes. From examining seismograms in the Los Angeles Basin, we have found
atmospheric waves similar to those in Australia and we therefore call them Los Angeles morning
glory waves (Tsai et al., 2004). See publications section for details.