Tropical Storm Blanca has made the move away from the western Mexican coast, and is heading out to sea in a west-northwest direction near 9 mph. Blanca's course will take her further out to sea and into cooler waters which will weaken the storm.
As a tropical storm, Blanca is generating a good amount of rainfall over the open ocean. NASA and the Japanese Space Agency's Tropical Rainfall Measuring Mission Satellite acts like a "rain gauge in space" and can estimate rainfall in storms. On July 6 at 12:09 a.m. EDT (0409 UTC) TRMM flew directly above Blanca and captured an image of rainfall happening throughout the storm.
Creating an image of TRMM's rainfall in a storm takes some doing. Hal Pierce at NASA's Goddard Space Flight Center in Greenbelt, Md., where TRMM is managed, assembles images from various TRMM instruments.
To create an image of rainfall analysis, Pierce uses data from the TRMM Microwave Imager and Precipitation Radar instruments and overlays it on a TRMM infrared image. The analysis shows heavy rainfall of over 50 millimeters per hour (~2 inches) in an area east of the center of circulation.