NASA Science Aircraft Monitoring Hurricane Earl
The flight track of NASA's DC-8 flying laboratory as it flew repeated passes over the eye of Hurricane Earl on Sept. 1. > View larger image
This graphic shows the flight track of NASA's DC-8 flying laboratory as it flew repeated passes over the eye of Hurricane Earl at mid-day Wednesday, Sept. 1.
Credit: NASA Image
All three of NASA's environmental science aircraft involved in the aerospace agency's Genesis and Rapid Intensification Processes, or GRIP, hurricane research campaign are in the air this week, tracking the path and intensity of Hurricane Earl off the east coast of the United States.

Although Earl was downgraded from a Category 4 to a Category 3 storm Wednesday morning, Sept. 1, it is still packing top sustained winds at 125 mph and is considered a threat to the Carolinas and other eastern states.

NASA's DC-8 flying laboratory, based at the Dryden Aircraft Operations Facility in Palmdale, Calif., went aloft from its field deployment site at Ft. Lauderdale, Fla., at mid-day Wednesday to overfly the hurricane. Scientists aboard the converted jetliner worked with a variety of instruments to characterize the powerful storm system, and the DC-8's flight path took it directly over the eye of the hurricane several times. In-flight reports indicated that all of the specialized instruments were functioning properly during the flight.

Meanwhile, remotely operated high-altitude Global Hawk was being prepared Wednesday for a 24-hour mission over Hurricane Earl. It was scheduled to depart from NASA's Dryden Flight Research Center at Edwards, Calif., about 9 p.m. Wednesday evening and after a cross-country transit, fly repeated patterns over the hurricane for at least eight hours while its suite of instruments monitored the storm's progression and characteristics. The unmanned aircraft, controlled by pilots and mission scientists at a control center at NASA Dryden, is due to return to Edwards Thursday evening.

The Global Hawk is carrying three primary instruments for the mission developed at a like number of NASA field centers – the Lightning Instrument Package, or LIP, developed at Marshall Space Flight Center, the High-altitude Imaging Wind and Rain Airborne Profiler, or HIWRAP, developed at the Goddard Space Flight Center and the High-Altitude Monolithic Microwave Integrated Circuit Sounding Radiometer, or HAMSR, developed at the Jet Propulsion Laboratory.

NASA's modified WB-57 weather reconnaissance aircraft, based at the Johnson Space Center's Ellington Field near Houston, is currently deployed to Tampa, Fla., and is also scheduled to overfly Hurricane Earl this week.

The Global Hawk flew a prior 15-hour flight over Tropical Storm Frank in the eastern Pacific Ocean southwest of Baja California last Saturday as part of the GRIP campaign. The DC-8 flying laboratory had flown two previous flights over Hurricane Earl from Ft. Lauderdale and from St. Croix, U.S. Virgin Islands over the past week.

The flights by the NASA science aircraft are in close support of operations being flown by NOAA aircraft that are also involved in the six-week GRIP campaign. For more information on GRIP, visit: www.nasa.gov/grip/.
Rob Gutro
NASA's Goddard Space Flight Center