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Hurricane Season 2007: Dalila (Eastern Pacific)
A Look at Rainfall in Weakening Tropical Storm Dalila

On July 22, 2007 (Pacific Time), Tropical Storm Dalila became the fourth named storm to form in the East Pacific, which at this point in the season is slightly below average for the region. Last year there were 19 named storms in total, slightly above the climatological average.

On Thursday, July 26, 2007 at 9:00 UTC (2:00 a.m. PDT) Tropical Storm Delila was located in the Eastern Pacific Ocean near 20.9 north latitude and 113.1 west longitude. She was moving west-northwest at 8 knots (9 mph) and had an estimated minimum central pressure of 1000 millibars. Delila's maximum sustained winds were near 45 knots (51 mph), gusting to 55 knots (63 mph).

Image of Tropical Storm Dalila on July 24, 2007 taken by TRMM
Click image for higher resolution version.

This image was made from data collected by the Tropical Rainfall Measuring Mission (TRMM) satellite over the eastern Pacific Ocean on July 24, 2007 at 13:46 UTC (6:46 am PDT) and shows Tropical Storm Dalila off the west coast of Mexico about 400 miles south of the southern tip of Baja California. The storm was moving slowly toward the northwest and is expected to head into cooler waters and dissipate over the open ocean in the next few days.

The image shows the horizontal pattern of rain intensities estimated from TRMM satellite data. Rain rates in the center swath are based on the TRMM Precipitation Radar (PR), and those in the outer swath on the TRMM Microwave Imager (TMI). The rain rates are overlaid on infrared (IR) and visible (VIS) data from the TRMM Visible Infrared Scanner (VIRS). Dalila is a rather weak system with no evidence an eye.

TRMM is a joint mission between NASA and the Japanese space agency JAXA.

Storm summary credit: Hal Pierce and Steve Lang, SSAI/NASA Goddard

Dalila and Cosme: Two Weak Storms in the Eastern Pacific

While Tropical Depression Cosme passed the big island of Hawaii, this past weekend brought the birth of the fourth named tropical storm of the eastern Pacific season, Dalila.

Pacific storms Cosme and Dalila

This satellite image shows Tropical Depression Cosme to the left of the big Island of Hawaii (over the text) and Tropical Storm Dalila off the coast of Baja California. This image was created from the National Oceanic and Atmospheric Administration's Geostationary Operational Environmental Satellites. This image, taken July 23 at 10:27 a.m. EDT (7:27 a.m. PDT) was created by NASA's GOES Project Science Office at NASA's Goddard Space Flight Center, Greenbelt, Md.

Dalila Tracking West-Northwest Away From Mexico

On Saturday, July 21, at 8:00 p.m. PDT, the National Hurricane Center identified a tropical depression south of Manzanillo, Mexico. The storm received its name, Dalila, Monday morning, July 23 at 9:00 UTC (2:00 a.m. PDT). At that time, the Dalila's center was located near 13.6 degrees north and 108.6 west. Dalila was moving west-northwest at 7 knots (8 mph), and had an estimated minimum central pressure of 1005 millibars. Dalila's maximum sustained winds were near 35 knots (40 mph) with gusts to 45 knots (52 mph).

Forecasters note that the current strong northeasterly wind shear (winds that can pull a storm apart) hammering Dalila is forecast to abate in 36 to 48 hours. That means that Dalila will be in a better environment for strengthening. However, by Friday, July 27, the storm is expected to encounter cooler waters north of 20 degrees north latitude and gradually weaken.

Rob Gutro
NASA Goddard Space Flight Center