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Hurricane Season 2009: Tropical Storm Marty (Eastern Pacific)
09.18.09
 
September 18, 2009

GOES-11 captured an image of Tropical Storm Marty (center) west of the Baja California peninsula. > View larger image
The GOES-11 satellite captured an image of Tropical Storm Marty (center) west of the Baja California peninsula on September 18 at 12:45 p.m. EDT.
Credit: NASA/GOES Project
Slow-moving Marty Headed for Drier Air, Cooler Waters

Marty was still holding onto tropical storm status on September 18, with maximum sustained winds near 40 mph and taking a slow march through the Eastern Pacific Ocean.

At 11 a.m. EDT he was located about 360 miles west-southwest of the southern tip of Baja California, near 18.9 north and 112.4 west. Marty is moving near 7 mph and has a minimum central pressure near 1004 millibars. Over the past two days, he only moved 40 miles!

The GOES-11 satellite captured an image of Tropical Storm Marty off the western Mexican coast on September 18 at 12:45 p.m. EDT. GOES is operated by the National Oceanic and Atmospheric Administration. NASA's GOES Project, located at NASA's Goddard Space Flight Center, Greenbelt, Md. creates some of the satellite images from the GOES satellites.

The National Hurricane Center reported that there was a "burst of deep convection (rising air and thunderstorm development)" near Marty's center this morning, however, cloud top temperatures (as measured by NASA's Atmospheric Infrared Sounder (AIRS) instrument on the Aqua satellite) have begun to warm. Warming cloud top temperatures are indicative of thunderstorms that have less strength than those in stronger tropical cyclones.

Marty's fate over the weekend lies in cooler waters and drier air. Those are the two factors he's going to face as he continues moving, and they'll weaken him over the weekend. Marty will likely be a remnant low pressure area by the beginning of next week.

Text credit: Rob Gutro, NASA/Goddard Space Flight Center



September 17, 2009

This NASA infrared AIRS satellite image shows Marty's clouds as the rounded area depicted in purple and blue. This NASA infrared AIRS satellite image shows Marty's clouds as the rounded area depicted in purple and blue. The image is from September 17 at 5:11 a.m. EDT and indicates high, cold clouds and thunderstorms.
Credit: NASA JPL, Ed Olsen
NASA's Infrared Satellite Sees Warmer Cloud Tops in Tropical Storm Marty

Marty is struggling to hold onto tropical storm status, and things are just going to get worse for him, as he moves into an area with stronger wind shear. Infrared satellite imagery from NASA's Aqua satellite showed that Marty's thunderstorm cloud tops are not as cold as they were earlier today, September 17, and his cloud pattern has become a little less organized.

Infrared imagery from NASA's Atmospheric Infrared Sounder (AIRS) indicates Marty's cloud tops have warmed slightly, indicating lower thunderstorm heights and a weakening in the storm. High thunderstorm cloud tops indicate a strong storm. When the thunderstorm cloud heights start dropping, they become less cold, and the thunderstorms are less powerful. Cloud-top temperatures are important because they tell forecasters how high thunderstorms are, and the higher the thunderstorm, the colder the cloud tops and the more powerful the thunderstorms.

AIRS also revealed that Marty's shape has become elongated, and when a storm begins to "stretch" its circulation becomes weaker.

Forecasters at the National Hurricane Center note, "Southwesterly shear is expected to increase during the next day or two and the cyclone will be moving into a drier and more stable air mass." As a result of moving into a more hostile environment, Marty is not expected to strengthen into a hurricane and instead begin weakening.

At 11 a.m. EDT, Marty's maximum sustained winds were near 45 mph, and he was moving north-northwest near 2 mph. His center was 300 miles southwest of the southern tip of Baja California, near 19.7 north and 113.1 west. He is expected to turn toward the northwest on Friday, September 18. Minimum central pressure is near 1003 millibars.

Marty is expected to weaken to a remnant low by the weekend.

Text credit: Rob Gutro, NASA/Goddard Space Flight Center



September 16, 2009

The GOES-11 satellite captured an image of Tropical Storm Marty on Wednesday, September 16 at 2:45 p.m. EDT. > View larger image
The GOES-11 satellite captured an image of Tropical Storm Marty off the western Mexican coast on Wednesday, September 16 at 2:45 p.m.
Credit: NASA/GOES Project
Tropical Storm Marty Forms in the Eastern Pacific

Marty is the thirteenth tropical storm to form in the Eastern Pacific, born this morning, September 16.

So far, there have been 16 tropical depressions in the Eastern Pacific, and Marty grew from the sixteenth. Three of the depressions never grew into tropical storms.

Marty, however, has maximum sustained winds near 40 mph and is expected to strengthen. At 11 a.m. EDT today, he was located about 320 miles south-southwest of the southern tip of Baja California, near 18.9 north and 112.4 west. Marty is moving near 3 mph and has a minimum central pressure near 1003 millibars.

The GOES-11 satellite captured an image of Tropical Storm Marty off the western Mexican coast on Wednesday, September 16 at 2:45 p.m. EDT. GOES is operated by the National Oceanic and Atmospheric Administration. NASA's GOES Project, located at NASA's Goddard Space Flight Center, Greenbelt, Md. creates some of the satellite images from the GOES satellites.

Currently Marty is no threat to land, but he's expected to move close to Baja California by the weekend.

Text credit: Rob Gutro, NASA/Goddard Space Flight Center