South East Asian Tropical waves (Summer).
- North America Storm grading system.
- South East Asia Storm grading system.
- Wave Propogation/Transformation.
- Low pressure areas develop.
Tropical waves are from the family of weather types called Troughs and are usually an inversion being that the north section is where the wind field disturbance situates and at the southern section of the trough inversion locates the Low Pressure area of the trough. Also these may be tilted and elongated from north to south. The Tropical Wave displays the opposite form to a ordinary weather trough as an upside down U rather then a ordinary U shape wind field.
Tropical waves form when as always there are the correct ingredients in the area and these ingredients may combine to disrupt the normal flow of tropical air streams leading to the creation of the tropical wave.
These ingredients are:
- Instability.
- Warmed Moisture molecules in the air column.
- Warmed seas and watery expanses.
- A weak wind shear environment.
- Heating mechanism (Summer).
- Tropical wind field (Trade winds in the Asian area).
Once the ingredients combine then the natural air flow in the tropics will be disrupted and give rise to a Tropical Wave pattern that may bring Heavy rains/Convection on the East of the System (Caribbean) waves may also appear in the south pacific and south east asia, the central east equatorial pacific and the caribbean and the indian ocean. They fair well in creating weather near the equator.
A trough inversion wind field sometimes only revealed at 700-850-500mb charts.
North America Storm grading system.
We know that the variety of Storms that can sprout from the typical Tropical Wave are graded into storm strengths by surface wind measurements then grading that also represent the weather family that derives from the grading system so by the Saffir Simpson Scale (Americas/Caribbean/Atlantic) the standards where created to better categorise what is propagated from the tropical wave and hence issue the appropriate public warning in emergencies this standard equates to:
- Category 1: Winds of 74–95 miles per hour (mph). This category is considered minimal, with some damage to roofs, shingles, and gutters of well-constructed homes. Power outages may last a few days..
- Category 2: Winds of 96–110 mph. This category is considered widespread, with some damage to roofs, doors, and windows of buildings. Power outages may last several days.
- Category 3 - 5: These categories are considered major hurricanes, with the potential for significant loss of life and damage with 5 being maximum.
Asia Storm grading system.
The Asian metric is differing with also a differing scale naming convention using the Typhoon designation for the strongest storm output and is as follows:
- Tropical depression:surface wind speeds of 33 knots and less.
- Tropical storm:surface wind speeds of between 34 knots to 47 knots.
- Severe Tropical Storm:surface wind speeds of between 48 knots to 63 knots.
- Typhoon:surface wind speeds of between 64 to 84 knots.
- Strong typhoon:surface wind speeds of between 85 to 104 knots.
- Super typhoon:These can be catastrophic surface wind speeds of 105 knots and more.
Wave Propogation/Transformation.
Tropical waves undergo a Transformation process (Propogation) reliant on there atmospheric environment they will encounter in there origin location and on the entire pathway environment the 500mb winds move the system into. This propogation process then will either Strengthen/Weaken the wave structure as the wave travels primarily Nth west in South East Asia from the Guam Area and unfolds into South East Asia see Tropical Storm Strami for the overview of the seperate storm process that takes place after a Tropical Wave leads to storm creation..
Low pressure areas develop.
A tropical wave propogates into a storm near guam.
When the Tropical wave strengthens it may do so quite mildly or rapidly depending on the ingredients available to the system then the Elongated Inverted Trough will change wind field structure into a Low Pressure area. This then becomes the beginning one of this list of weather factors that may unfold.
- Cyclones in the South Pacific (summer).
- Typhoons in South East Asia.
- Hurricanes in the Caribbean/Central East Equator Pacific/Atlantic.
- Typhoons in the bay of bengal.
- Tropical storms.
- Tropical depressions.
- Convective families of weather.
Tropical waves account for a large percentage of the creation of the above so knowing and being informed of there whereabouts, times, and forecast is vital for Maritime, Public and Aviation stakeholders. Hot Summers with High Humidity and Weak sheared environments in the Maritime regions of the Worlds Storm producing areas tend to output a large percentage of tropical waves in there weather output when the correct factors are in place.
Also remember that not all Tropical waves will lead to a storm but being informed will help to better prepare the populations affected. Lastly Tropical waves become quite active in summers and when there is plenty of humidity and large heated water surface areas and finally weak wind shear (Ideal) in the Tropics.