Eastern Pacific and Eastern Atlantic ITCZ Hovmoller  These plots
aid in tracking the location, intensity, and evolution of the
eastern Pacific and eastern Atlantic Inter-Tropical Convergence
Zone (ITCZ). [This is one technique of many used to track the
ITCZ; others include plotting vertical velocity, divergence,
rainfall, etc. This product uses geosynchronous satellite
imagery and therefore has the advantage of full coverage in
space and frequent coverage in time. It uses cloud top
temperatures as a proxy for surface convergence.]  The top plot
shows the latest infrared (IR) brightness temperatures from GOES
Channel 4, where colder temperatures are shown in lighter
colors.. To the left of the IR image is a zonal (E-W) mean of
those temperatures, smoothed to 1° resolution. 1 and 2 standard
deviations (1σ and 2σ) from the domain average are shown as
vertical dashed lines and help identify significant cold cloud-
top bands.  The bottom plot is a Hovmoller (time-latitude)
diagram of the zonal mean brightness tempe