NASA infrared imagery sees heavy rain potential in Tropical Depression 2E

Jun 03, 2014 by Rob Gutro
NASA's Aqua satellite passed over Tropical Depression 2E on June 3 at 4:17 a.m. EDT and gathered data about the depression's cold cloud-top temperatures (purple). Credit: NASA JPL, Ed Olsen

NASA's Aqua satellite captured an infrared image of Tropical Depression 2E that revealed high, very cold cloud top temperatures. Strong thunderstorms with cold cloud top temperatures that reach high into the troposphere have the potential to drop heavy rainfall amounts, and the National Hurricane Center has forecast large rainfall for the southern region of Mexico over the next couple of days.

A Tropical Storm Warning is in effect for Salina Cruz to the Mexico and Guatemala border as the depression remained stationary near the southwestern coast of Mexico on June 3.

NASA's Aqua satellite passed over Tropical Depression 2E on June 3 at 08:17 UTC (4:17 a.m. EDT) and gathered data about the depression's cloud temperatures. The Atmospheric Infrared Sounder (AIRS) instrument that flies aboard NASA's Aqua satellite provided that infrared data. A false-colored image of the cloud temperatures was created at NASA's Jet Propulsion Laboratory (JPL) in Pasadena, California using the .

The AIRS image showed very cold cloud top temperatures in the depression indicating that the thunderstorms had strong uplift that pushed near the top of the troposphere. Temperatures drop to just under 220 degrees kelvin (-63.6 F/-53.1C) at the top of the troposphere (and where the tropopause begins). Some of the depression's storms had cloud tops that cold and that high. An analysis of AIRS data indicated that storms that high in the troposphere have the potential for .

Coupled with the potential for heavy rainfall, and the slow movement of Tropical Depression 2E, the National Hurricane Center (NHC) noted in its bulletin at 8 a.m. EDT (5 a.m. PDT) that rainfall totals may be extreme over a large part of southern Mexico.

This NOAA GOES-East satellite image from June 3 at 7:45 a.m. EDT shows Tropical Depression 2E interacting with a low pressure area in the southwestern Gulf of Mexico. Credit: NASA/NOAA GOES Project

According to NHC: tropical Depression 2E is expected to produce as much as 10 to 20 inches of rain over a large part of southern Mexico through Saturday...with isolated amounts exceeding 30 inches likely over the mountainous terrain of the Mexican states of Oaxaca and Chiapas. Tropical Depression 2E is also expected to produce total rainfall amounts of 5 to 10 inches in Guatemala. These rains are likely to result in life-threatening flash floods and mud slides.

At 8 a.m. EDT (5 a.m. PDT), Tropical Depression 2E's maximum sustained winds were near 35 mph (55 kph). It was stationary about 140 miles (220 km) south-southeast of Salina Cruz, Mexico near 14.4 north latitude and 94.3 west longitude. The depression's minimum central pressure was 1002 millibars. NHC expects the depression to being moving slowly northward later today, June 3 and near the coast in the warning area on June 4.

Another factor that hurricane forecasters at NHC are dealing in the forecast of Tropical Depression 2E is the interaction with a low pressure area in the Bay of Campeche on the Gulf of Mexico side of Mexico. The depression is also interacting with an upper-low pressure area as well as the Gulf system, making for a complicated scenario.

Forecaster Blake at the NHC noted during the 8 a.m. EDT discussion that some strengthening is possible before landfall in a day or so, although significant strengthening is not expected due to land interaction and the poor initial structure.

Explore further: NASA watching year's first tropical low headed for southwestern Mexico

add to favorites email to friend print save as pdf

Related Stories

TRMM and Aqua satellites peer into Tropical Storm Amanda

May 28, 2014

Hurricane Amanda has weakened to a tropical storm, but not before NASA's TRMM satellite took a look under its clouds at the rate of heavy rainfall it was generating. After weakening to a tropical storm, NASA's ...

Recommended for you

Tropical Depression 9 forms in Gulf of Mexico

5 hours ago

Tropical Depression Nine formed over the western Bay of Campeche, Gulf of Mexico and is forecast to make a quick landfall on Mexico's Yucatan Peninsula. NOAA's GOES-East Satellite captured the birth of the ...

$58 million effort to study potential new energy source

10 hours ago

A research team led by The University of Texas at Austin has been awarded approximately $58 million to analyze deposits of frozen methane under the Gulf of Mexico that hold enormous potential to increase ...

And now, the volcano forecast

11 hours ago

Scientists are using volcanic gases to understand how volcanoes work, and as the basis of a hazard-warning forecast system.

User comments : 1

Adjust slider to filter visible comments by rank

Display comments: newest first

Shootist
1 / 5 (1) Jun 03, 2014
Starting to beat the weather war drums early on this one, eh?