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A double-satellite NASA-style view of the first tropical storm in eastern Pacific: Adrian

09.06.2011
The first tropical depression in the Eastern Pacific Ocean is now the first tropical storm, and two satellites are providing NASA insights into its thunderstorms, rainfall, and intensity. NASA satellite data on newly born Tropical Storm Adrian shows high cloud tops and moderate rainfall, indications that the storm is getting stronger, triggering a tropical storm watch in Mexico.

Tropical Depression 1E is the first tropical depression of 2011 and formed in the eastern Pacific Ocean early on June 7. By the morning of June 8 it had strengthened into Tropical Storm Adrian, and is now forecast by the National Hurricane Center to reach hurricane strength.


This infrared image of Tropical Storm Adrian was taken from the GOES-11 satellite on June 8 at 12:00 UTC (8:00 a.m. EDT) and shows a compact, rounded storm off the western Mexico coast. The image reveals that Adrian has some higher, stronger thunderstorms in the center that are casting shadows on lower clouds around them. Credit: Credit: NASA/NOAA GOES Project, Dennis Chesters

This morning, the government of Mexico posted a tropical storm watch for the Mexican coast from Acapulco, west to Punta San Telmo. That means conditions are possible in the watch area from 24 to 48 hours. Meanwhile, rough surf and rip currents can be expected in the southwestern Mexican coast later today.

When the Geostationary Operational Environmental Satellite called GOES-11 passed over Tropical Storm Adrian earlier today, June 8 at 12:00 UTC (8:00 a.m. EDT), an infrared image shows Adrian as a compact, rounded storm off the western Mexico coast. GOES satellites are managed by NOAA, and images and animations are created at NASA's Goddard Space Flight Center in Greenbelt, Md. by the NASA/NOAA GOES Project.

The GOES-11 image revealed that Adrian has some higher, stronger thunderstorms around the center of circulation that are casting shadows on lower clouds around them. Those higher thunderstorms are stronger than the surrounding thunderstorms, and are likely dropping heavy rainfall (as much as 2 inches/50 mm per hour). The higher thunderstorms are also a sign that the storm continues to strengthen.

Rainfall within Adrian was captured yesterday, June 7 at 0727 UTC (3:27 a.m. EDT), when it was still Tropical Depression 1E. That's when the Tropical Rainfall Measuring Mission (TRMM) satellite flew overhead. TRMM is like a flying rain gauge in space because its precipitation radar instrument can measure rainfall rates. At that time TRMM noticed that Tropical Depression 1E had moderate rainfall surrounding its low level center. Moderate rainfall rates are between .78 to 1.57 inches (20 to 40 mm) per hour.

Adrian was already close to hurricane strength this morning, June 8. At 8 a.m. PDT (11 a.m. EDT), Adrian's maximum sustained winds were near 70 mph (110 kmh. It was about 285 miles (455 km) south-southwest of Acapulco, Mexico near 12.9 North and 100.8 West, and moving north-northwest near 5 mph (7 kmh). Minimum central pressure was 994 millibars.

The National Hurricane Center forecasts that Adrian will continue to strengthen and turn to the north-northwest, followed by a turn to the west-northwest.

Rob Gutro | EurekAlert!
Further information:
http://www.nasa.gov

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