Eye to Eye: Seeing Hurricanes as Only NASA Can
Following on the heels of Hurricane Charley, Frances slammed into Florida this weekend, wreaking further havoc on an already battered coastline, (+ NASA's Kennedy Space Center Assessing Damage
). Though most would prefer to forget, the public was reminded of a very similar event that occurred close to this time last year.
Image above: Hurricane Frances as seen by MODIS. Click on image to view animation (4.6 Mb) Credit: NASA
September 18th will mark the one year anniversary of Hurricane Isabel's landfall. Isabel and Frances started off looking so similar, they could have been twins. They both were large and powerful, they both originated in Africa and traveled along the same path across the Atlantic until reaching Antilles near the Caribean.
Image Above: This image shows where hurricanes are born. Click image to see the life span of Hurricane Isabel. The animation follows 2003's Hurricane Isabel from its surprising birthplace in the Ethiopian Highlands of East Africa, across the Atlantic Ocean, and to the United States. Note how Isabel gains size and speed over the warm waters of the Atlantic.
Isabel turned further north than Frances did. Its not a surprise that Frances occurred very close to the one year anniversary of Isabel. Both of these massive storms required summer temperatures to heat up the ocean surfaces to 82 'F to fuel these hurricanes.
When Isabel arrived in North Carolina on September 18th, she made a name for herself, by packing hurricane force winds as she came ashore.
Now, after almost a year after studying information gathered by satellites, airplanes, buoys, ships and computer models gathered during Isabel's journey, scientists have a unique insight into her life.
Hurricane Isabel was a long-lived Cape Verde hurricane that reached Category 5 status on the Saffir-Simpson Hurricane Scale with maximum sustained winds of 166 mph at sea. It made landfall on North Carolina's Outer Banks as a Category 2 hurricane with sustained winds between 97-103 mph. Isabel was one of the most significant tropical cyclones to affect portions of northeastern N.C. and east-central Va. since 1954's Hurricane Hazel.
GOES Satellite image of Hurricane Isabel. Click image to see animation of Hurricane Isabel.
NASA and National Oceanic and Atmospheric Administration (NOAA) satellites monitored Isabel's track, wind intensity, precipitation, and temperature inside the storm using multiple sensors on a number of earth-observing satellites simultaneously. NASA satellite data was provided to NOAA, who provided the watches and warnings to the public.
NASA's Seawinds instrument on QuikScat satellite looked at Isabel's wind speed and direction. NASA and the Japanese Meteorological Agency's Tropical Rainfall Measuring Mission (TRMM) satellite kept a close eye on Isabel's clouds and rainfall to see if she was getting stronger or weaker.
NASA's Aqua and TRMM satellites looked through the clouds at sea surface temperatures. Sea surface waters warmer than 82 degrees (F) can make hurricanes stronger. Scientists also looked at the heights of the sea to determine Isabel's change in strength using the Jason-1 satellite.
Image Above: Satellite image of sea surface temperatures (SST) around Florida and the Gulf of Mexico. Orange and red colors represent SST of 82 degrees F or warmer. Click image to see
animation of SST from January to September (1.6 Mb).
NOAA's GOES East satellite provided images as forecasters matched where she was going both day and night to where the computer models projected she would go. The U.S. Department of Defense also provided data from the Defense Meteorological Satellite Program (DMSP) satellite.
Closer to Earth aircraft kept a closer eye on Isabel, dropping sensors into the storm to get readings on temperature, humidity and pressure. The 53rd Weather Reconnaissance Squadron of the U. S. Air Force Reserve Command, the NOAA Aircraft Operations Center, and a Canadian research aircraft all observed Isabel.
At the Earth's surface, scientists constantly gathered information from ships, land stations, and buoys.
In addition to using satellites, several computer models were used. NOAA's Tropical Analysis and Forecast Branch (TAFB), NOAA's Satellite Analysis Branch (SAB) and the U. S. Air Force Weather Agency (AFWA) estimated storm intensity. At NOAA's National Hurricane Center several computer models were run and interpreted by forecasters, resulting in hurricane advisories throughout Isabel's life.
Click image to view hurricane model A recent improvement in hurricane modeling techniques is just starting to emerge from NASA, promising great strides in understanding these giant storms. This animation shows five days in the life of Hurricane Isabel, you can see how closely the artificial storm (in green) matches the real world observations (in yellow) as it actually happened.
Hurricane conditions affected portions of eastern N.C, and southeastern Va. Rainfall averaged 4-7 inches over large portions of eastern N.C., east-central Va. and Md. Rainfall totals of 8-12 inches with locally higher amounts occurred in the Shenandoah Valley in northern Va.
Storm surges were 6-8 feet above normal tide levels near the point of landfall along the N.C. coast and in the upper reaches of the Chesapeake Bay near Annapolis and Baltimore, Md. Isabel was directly responsible for 16 deaths along the U.S. east coast.
Isabel was just under one month old when she reached the end of her life. On September 20, she became "extra tropical" developing characteristics like storms outside the tropics, and moved northward into Canada. Once in Canada, Isabel was absorbed into another weather system. She left behind her a trail of property damages up to $3.37 billion in her wake through the U.S., with a minimal loss of life as a result of improved technology and forecasts.
For information or to see more animations on cradle to grave of Hurricane Isabel visit NASA Goddard Space Flight Center
+ Towers of Warm Air Signal Frances' Growth
NASA Goddard Space Flight Center