Category Archives: Tropical Wave

2017 ATLANTIC HURRICANE SEASON IS 43% DONE!

On this Saturday 19 August we are eleven weeks and two days into the 2017 Atlantic Hurricane Season, which means the ‘official’ Atlantic season is now 43.4% complete. Technically this means we have fourteen weeks and five days left in the season, unless Mother Nature decides to do something different.

More important than how much time is left for the official 2017 Atlantic hurricane season to be over, is the fact that we are approaching what historically  has been the peak of the Atlantic season, the first half of September.

Projected track for Tropical Storm HARVEY, the 8th named tropical cyclone of the 2017 Atlantic hurricane season, projected track (courtesy of the U.S. Naval Research Lab)

The Atlantic has been busy with tropical cyclones so far in 2017, with eight named storms so far; Tropical Storm HARVEY, now in the east-central Caribbean and moving in the general direction of Belize and the Yucatan, is the 8th named tropical cyclone in 2017 in the Atlantic basin.

GOES East infrared satellite image (NOAA) of 08/19/2017 showing tropical storm HARVEY in the Caribbean and several tropical waves following behind all the way to the coast of equatorial Africa

In what could be a possible sign of things to come during the approaching peak of the season, there are several tropical waves and areas of disturbed weather following behind HARVEY to the northeast of Puerto Rico and along ‘hurricane alley’ all the way to the eastern Atlantic waters off the coast of equatorial Africa south of the Cape Verde Islands, which could be seeds for potential cyclogenesis in the basin. A possible contributing factor to such potential cyclonic activity could be the rather warm surface waters along ‘Hurricane Alley’, in the Caribbean and the Gulf and other areas of the Atlantic basin.

Image of 08/18/2017 showing rather warm surface waters of the Atlantic, which are reaching 30 Celsius in some areas, mainly along ‘Hurricane Alley’, in the Caribbean and near Florida and the Bahamas, which are an important contributing factor to potential cyclonic activity

On the other side of the continent, over the eastern waters of the north Pacific, the 2017 hurricane season that officially started on 15 May has also been a busy one so far, with eleven named tropical cyclones in 13 weeks. The latest tropical cyclone there is Tropical Storm KENNETH now moving NNW and away from land.

GOES West infrared image (NOAA) of 19 August 2017 showing Tropical Storm KENNETH moving away from land over tye eastern north Pacific off the coast of Mexico

All interest affected by cyclonic activity generated in the Atlantic basin and in the eastern north Pacific sub-basin must pay attention. Get ready. Be prepared. Remain alert. MITIGATE!

TWIN STORMS IN THE PACIFIC WHILE THE ATLANTIC STIRS

Some interesting cyclonic events are taking place in the northern tropics on this Friday 28 July 2017.

Infrared satellite image (NOAA) of 28 July 2017 showing tropical storms HILARY and IRWIN over the Pacific Ocean waters between Mexico and Hawaii, following respective tracks that may cause them to interact in some fashion

A set of twin tropical cyclones, HILARY and IRWIN (See our posting of 25 July), appear to be in a collision course midway between Mexico and Hawaii in the Pacific. Now downgraded to tropical storm strength Hilary is moving WNW while nearby to its southwest Irwin is tracking NNW putting these tropical cyclones on a course for potential interaction over the next day or so. Both Hilary and Irwin are packing maximum sustained winds of 110-115 kph posing no threat to land.

Infrared satellite image (JTWC) of 28 July 2017 showing a strong typhoon NESAT aiming for Taiwan over the Philippines Sea

Farther to the west, over the Philippines sea a strengthening Typhoon NESAT is starting to brush past the Northern Philippines as it aims for Taiwan. At the same time, Typhoon NORU is over the northwestern Pacific making a turn toward the NNW to the east of Japan.  So, this makes for four active named-tropical cyclones over the northern Pacific basin, in addition to several areas of disturbed weather and tropical waves throughout the basin that may be seeds for further cyclonic activity in coming days.

Visible light satellite image (NOAA) of 28 July 2017 showing a large tropical wave (INVEST 97L) mowing generally westward along Hurricane Alley

Of interest to us here  in South Florida, and to others throughout the Caribbean, Central America, the Gulf and the Atlantic seaboard of the U.S.A., is a tropical wave located approximately 1000 kilometers southwest of the Cape Verde Islands that has been designated as INVEST 97L by NOAA’s National Hurricane Center while monitoring it for possible cyclonic development over coming days.

Infrared satellite image (NOAA) showing the Eastern Atlantic and Equatorial Africa region where a train of tropical waves and disturbed weather cells moves westward toward Hurricane Alley. This includes a tropical wave 1000 kilometers SW of the Cape Verde Islands designated as INVEST 97L, which is being monitored by the National Hurricane Center

Farther to the east over waters of the Eastern Atlantic and Equatorial Africa there is a train of tropical waves, including one rather  large and strong storm, moving westward toward Hurricane Alley. There is plenty of seeds that may fuel cyclogenesis in that region over the next few days. All interests in our neck-of-the-woods will do well to pay attention, remain alert, and be prepared! MITIGATE!