Tropical Depression 1E formed when the low pressure area called System 91E strengthened overnight. Today, June 7, Tropical Depression 1E (TD1E) was located about 365 miles (590 km) south of Acapulco, Mexico near 11.6 North and 100.0 West. It had maximum sustained winds near 30 mph (45 kmh) and was moving to the northwest near 3 mph (6 kmh). Minimum central pressure was near 1006 millibars.
Tropical Depression 1E is small but thunderstorm "Hot Towers" have reached heights of about 16 km (~9.9 miles) indicating some strong convection (red) around the storm's center. Credit: SSAI/NASA Goddard, Hal Pierce
When TRMM passed over TD1E yesterday morning (it was still System 91E at that time) at 0823 UTC (4:23 p.m. EDT) its precipitation radar instrument analyzed the rainfall rates The majority of rainfall occurring at that time was moderate between .78 to 1.57 inches (20-40 mm) per hour, with some isolated areas of heavy rainfall, falling at almost 2 inches (50 mm) per hour.
More importantly, TRMM noticed some of the thunderstorms around the center of circulation were actually what is called "hot towers."
A hot tower is a rain cloud that reaches at least to the top of the troposphere, the lowest layer of the atmosphere. It extends approximately nine miles (14.5 km) high in the tropics. These towers are called "hot" because they rise to such altitude due to the large amount of latent heat. Water vapor releases this latent heat as it condenses into liquid. They're also indicative of a lot of energy within a tropical depression. In the case of Tropical Depression 1E, some of the hot towers reached heights of 16 km (~9.9 miles).
The National Hurricane Center forecasts TD1E to intensify and continue moving in an north-northwesterly direction, steering away from land.
Rob Gutro | EurekAlert!
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