Tag Archives: northern hemisphere

Tropical cyclone activity continues worldwide!

Tropical cyclone activity continues unabated in the northern hemisphere. More than sixty named-storms have been generated worldwide so far in 2018 in the northern  hemisphere, from the Atlantic, the Pacific (east, central, and northwest basins), to the Indian ocean.

Large and powerful super-typhoon TRAMI continues its approach toward Taiwan over the northwest Pacific

Currently super-typhoon TRAMI continues to move toward Taiwan, while other large tropical waves and disturbed weather cells are active over the Northwest Pacific.

Satellite image (NOAA) of 26 September 2018 showing Hurricane ROSA, the 18th named tropical cyclone to form in the east Pacific during this year’s season, which officially started on 15 May.

In the East Pacific basin hurricane ROSA, the 18th named storm of the 2018 season is active off the coast of Mexico. Other potentially cyclonic systems are on the move off the coast of Central America and Panama.

Satellite image (NOAA) of 26 September 2018 showing various storms systems over the Atlantic basin, including a regenerated KIRK, now a tropical storm, a degrading LESLIE, and other potentially cyclonic systems near the Carolinas’ coast and in ‘Hurricane Alley” and Equatorial Africa.

In the Atlantic, KIRK has regenerated into a tropical storm to the east of Barbados, while LESLIE now a tropical depression is approaching the region of the Azores Islands. Another disturbed weather system is off the coast of the Carolinas to the south of Cape Hatteras, which warrants monitoring. Other tropical waves extend from ‘Hurricane Alley’ to Equatorial Africa.

Following the Autumn equinox the Sun above is now to the south of the equator increasing the heat content of the world’s oceans. As a result, we are beginning to detect some potential for cyclonic development in the southern hemisphere. One such system is now being monitored near Australia’s northeast coast.

There is plenty of fuel for continued tropical cyclone generation worldwide this Wednesday 26 September 2018. Vulnerable communities everywhere will do well to remain alert. Be prepared! MITIGATE!

Subdued 2016 Tropical Cyclone Activity so far in the Northern Hemisphere

A bit more than two weeks into the 2016 Northern Hemisphere summer we have three-named storms active over the larger Pacific Ocean basin, plus one tropical wave moving westward in the middle of hurricane alley in the Atlantic.

A tropical wave moves westward toward the Caribbean along 'hurricane alley'. Satellite images from NOAA on 07072016 using infrared filter
A tropical wave moves westward toward the Caribbean along ‘hurricane alley’. Satellite images from NOAA on 07072016 using infrared filter

Hurricane BLAS and AGATHA, now a tropical depression, are moving westward some 2000 kilometers east of the Big Island in Hawaii, while category 5 typhoon NEPARTAK, now weakening somewhat, is approaching landfall on the east coast of Taiwan over in the West Pacific on this Thursday 7 July 2016.

NOAA GOES satellite image of 07072016 showing Hurricane BLAS moving over the eastern Pacific approximately 2000 kilometers east of Hawaii
NOAA GOES satellite image of 07072016 showing Hurricane BLAS moving over the eastern Pacific approximately 2000 kilometers east of Hawaii

Tropical cyclone activity so far in 2016 in the northern hemisphere has been somewhat subdued in terms of actual cyclogenesis when compared to recent years.  As of today, Thursday 7 July 2016,  there have been 11 named tropical cyclones worldwide in the northern hemisphere compared to 19 during the same period in 2015. Three of the 2016 storms have only been generated over the past couple of days. The only basin that is a bit more active so far in 2016 versus 2015 is the northern Atlantic, which actually saw its first name tropical cyclone,  Alex, in January of this year, which ended up winding over the central North Atlantic and eventually impacting Greenland.

Satellite image [NOAA} of 07072016 showing Typhoon NEPARTAK approaching landfall on the east coast of Taiwan
Satellite image [NOAA} of 07072016 showing Typhoon NEPARTAK approaching landfall on the east coast of Taiwan
In my opinion, most of this change in tropical cyclone activity so far in 2016 may be attributed to the current neutral El Niño  conditions over the central to eastern Pacific near the equator, after a strong ENSO (El Niño Southern Oscillation) anomaly in 2015 and earlier this year.  Sea-surface temperatures (SST) at the equator are somewhat cooler than average in the central-to-eastern Pacific Ocean. Conditions are looking favorable for the development of La Niña during this 2016 summer in the Northern Hemisphere, perhaps by the fall and the 2016-2017 winter.

There were a total of sixty-six named tropical cyclones plus eleven tropical depressions in the Northern Hemisphere during 2015. Only time will tell how many named storms we will have in 2016, and which basin will see above or below average seasons this year.

Historically La Niña years have brought increased cyclogenesis over the northern Atlantic basin, and the forecast from the National Hurricane Center and others that have issued predictions calls for a somewhat above average 2016 Atlantic Hurricane season.

All interest in and around the Atlantic basin should pay attention,  remain alert, be prepared, and mitigate!