Tag Archives: National Hurricane center

OUR TROPICS: Something is stirring!

Tropical Depression #4 in the eastern East Pacific, off the Pacific coast of Mexico and a couple of low pressure systems, one just 370 km (230 miles) east of Jacksonville, Florida are signs that something may be ‘afoot’ in our neck-of-the-woods.

Infrared color-enhanced GOES WEST satellite image (NOAA) on 29 June 2014 showing a tropical depression chased by a low pressure system over the eastern east Pacific off the coast of Mexico
Infrared color-enhanced GOES WEST satellite image (NOAA) on 29 June 2014 showing a tropical depression chased by a low pressure system over the eastern east Pacific off the coast of Mexico

TD #4 is near Acapulco, Mexico in the same region that has recently generated other tropical activity during the 2014 East Pacific Hurricane Season, which officially activated  on 15 May 2014. The system which is moving generally WNW at 26 kph (16 mph) is being ‘chased’ by a large low pressure cell near the coast that may be showing some cyclonic tendencies. While both these east Pacific storms are moving away fro the mainland, vast amounts of rain and potential flooding is possible along the coastal region in central/southern Mexico.

Color-enhanced infrared GOES EAST satellite image (NOAA) from 29 June 2014 showing a low-pressure system tracking parallel to Florida's east coast
Color-enhanced infrared GOES EAST satellite image (NOAA) from 29 June 2014 showing a low-pressure system tracking parallel to Florida’s east coast

Closer to us, here in Florida, there is a low pressure system some 370 km (230 miles) east of Jacksonville that is moving generally southward paralleling the coastline. This system is tracking in a favorable ocean-atmosphere environment and showing some potential for cyclonic development in the course of the next couple of days. The National Hurricane Center is investigating this system.

Composite infrared full-disc satellite image (NASA) showing Earth's western hemisphere on 29 June 2014
Composite infrared full-disc satellite image (NASA) showing Earth’s western hemisphere on 29 June 2014

Zooming out to look at the larger North Atlantic basin and parts of the Pacific we can see the outline of the ‘belt of tropical activity’ gradually getting more defined and gradually shifting northward. It is clear we must monitor all of these systems closely, while remaining prepared and alert. Practice MITIGATION!

GOING OUT WITH A BANG?

In the course of just over one week since SANDY generated from a tropical depression in the Caribbean, became a tropical storm and reached hurricane strength as it hit Jamaica and then Cuba, also affecting Haiti and the Dominican Republic. It then continued over the Bahamas, creating concerns among residents of Florida as all of the peninsula’s east coast found itself within the “cone of uncertainty used by The National Hurricane Center to surround the predicted track of a tropical cyclone.

Atlantic wide satellite view (NOAA) on 28 October 2012 showing water vapor in the atmosphere to highlight Tropical Cyclone SANDY, other areas of disturbed weather, as well as vast regions of mainly dry air

In moving over The Bahamas hurricane SANDY began following what could best be  described as a zigzagging track, first aiming toward the northwest paralleling the coast of Florida, but then turned north and later on toward the northeast paralleling the coast of Georgia and South Carolina, only to start describing another turn to the north and then the northwest aiming toward the mid-Atlantic and northeastern coastline of the USA.

Projected track for Hurricane SANDY as of 28 October 2012 developed by the U.S. Navy Research Laboratory on the basis of observational data from NOAA

In the process of meandering over the western Atlantic following the USA coastline Hurricane SANDY also began growing in size until it has become quite a large storm menacing hundreds of miles of USA coastline from North Carolina to Maine. It appears storm surge will be the main hazard as this behemoth of a tropical cyclone interacts with the numerous bays, sounds, inlets and other topography along the coastal region, which generate a funneling effect on the rushing waters contributing to storm surge and waves of enormous height. However, inland flooding and strong winds will also add to the impact, and could cause sever damage and human suffering.

GOES color-enhanced infrared satellite image (NOAA) showing Hurricane SANDY on 28 October 2012 as it approaches the coast of the USA

With SANDY being the 19th named storm of the 2012 Atlantic Hurricane Season are we already seeing the last of the season? Is this the 2012 Atlantic Hurricane Season going out with a bang, or is there more fuel left in the tropics so that we may still see additional cyclonic activity in days and weeks to come? After all the “official” season, as if Mother Nature really pays attention to this,  still has more than four weeks left to go.

Satellite image (NOAA) showing two tropical waves over hurricane alley and the eastern Atlantic on 28 October 2012

Regarding the possibility of more fuel left in the tropics to support additional tropical cyclone activity in the Atlantic, there are currently two tropical waves moving along hurricane alley that may warrant paying attention to over coming days, for any signs of potential further development.

Color-enhanced infrared satellite image on 28 October 2012 showing Typhoon SON-TINH over the Gulf of Tonkin about to make landfall in Viet Nam near Haiphong and Hanoi

Elsewhere in the world, there is tropical cyclone activity in the South China Sea at the northwestern extreme of the Pacific Ocean, where Typhoon Son-Tinh is making landfall over Viet Nam over the Gulf of Tonkin near Haiphong and Hanoi. Also in the Pacific there is a good sized tropical wave half way between Hawaii and the Philippines while closer to our region, over the Eastern Pacific,  there is a large elongated cell of disturbed weather and low pressure extending from just off-shore Central America to about 1,000 kilometers SSW of Acapulco, Mexico, which may show some potential for cyclonic development.

Color-enhanced infrared GOES satellite (NOAA) image on 28 October 2012 showing a region of low pressure and disturbed weather off the coast of central America and Mexico

There is also plenty of stormy weather over the northern Indian Ocean where we see a large cell of low pressure, showing some signs of potential cyclonic activity, over the southern end of the Bay of Bengal, off the coast of India near Madras and the nation of Sri Lanka, which may warrant close monitoring over the next couple of days. On the other side of the subcontinent, off the west coast of India over the Arabian Sea there are some areas of disturbed weather that may warrant monitoring.

Color enhanced infrared satellite image showing a potential tropical cyclone near India and other regions of disturbed weather over the Indian Ocean on 28 October 2012

The southern hemisphere is relatively quiet at this time, except for a couple of areas near New Zealand and over Australia, although there are large areas of disturbed weather and strong winds near the extreme southern latitudes.

Full-disk satellite image of Earth over the Pacific Ocean on 27 October 2012 showing the ‘belt of tropical activity’, spanning from just off the coast of Mexico to near the Philippines, as well as a cell of low pressure near Mexico
Full-disk satellite image of Earth’s western hemisphere on 28 October 2012 showing a discontinuous ‘belt of tropical activity, a couple of tropical waves along hurricane alley and in the eastern Atlantic, as well as Hurricane Sandy approaching the USA coastline

How damaging will the impact of Hurricane SANDY be over the USA? Is SANDY the last activity of the 2012 Atlantic Hurricane Season? How much more cyclonic activity will there be in the northern hemisphere? When will the southern hemisphere start to see more tropical cyclones? How will 2012 rate in terms of total tropical cyclone activity worldwide compared to previous years? Yes, there are a number of questions that we would like to have answered, but we will have to wait until after the end of the year for some of those answers.