What is the travel speed of TRS before turning?

What is the travel speed of TRS before turning?

The speed of TRS is usually about 10 knots in their early stages, which increases a little with latitude, but it seldom exceeds 15 knots before recurving, but thereafter 20 to 25 in usual, though the speed of 40 knots or even more has been reported.

What are the factor associated in the decay of the TRS?

Decay Stage At this stage, the warm core of TRS is destroyed, as the central pressure increases and the maximum surface winds weaken. Decay may occur very rapidly if the system moves into an unfavourable atmospheric or geographic environment. At this stage, the heavy or medium rain can be available.

What do you understand about the tropical revolving storm or TRS?

Tropical Revolving Storm is an intense rotating depression (a region of low pressure at the surface) which develops over the tropical oceans. It consists of a rotating mass of warm and humid air and creates strong winds, thunderstorm , heavy rains, very heavy seas and swell etc.

What 3 factors diminish a hurricane’s intensity?

Four Factors that Can Weaken Tropical Cyclones

  • Cooler Sea surface temperatures less than 79 degrees Fahrenheit (26 degrees Celsius)
  • High vertical wind shear.
  • Dry air.
  • Land masses along the projected storm track.

How is a TRS formed?

As the air rises quickly more warm moist air is drawn upwards from above the ocean creating strong winds. The rising warm air spirals upward and cools. The water vapour it carries condenses and forms cumulonimbus clouds. These cumulonimbus clouds form the eye wall of the storm.

What causes the semicircle to form?

The side of a tropical cyclone to the right of the direction of movement of the storm in the Northern Hemisphere (to the left in the Southern Hemisphere), where the winds are stronger because the cyclone’s translation speed and rotational wind field are additive. The opposite side is termed the navigable semicircle.

How does the wind speed change as each hurricane moves across the ocean and across land?

The roughness of the land terrain increases friction, but more critical, once over land, the system is cut off from its heat and moisture sources. Sustained winds in a hurricane will decrease at a relatively constant rate (approximately half the wind speed in the first 24 hours).

What happened to the wind speed when the hurricane was over land?

Second, as a minor weakening effect, when the storm moves on land, surface wind speeds are decreased by friction. The inrush of warm, humid air into the center of the hurricane as it weakens and “fills” must be accompanied by rising motion above the storm.

How does a TRS form?

Coriolis force, weakest at the equator and strongest at the Poles, is also required for a TRS to form. This is the apparent force caused by the rotation of the Earth and causes the TRS to rotate.

What are the ideal conditions for the formation of a TRS and what actions are to be taken when the presence of TRS is confirmed?

Sufficiently warm temperatures : Normally an ocean temperature of 26.5°C is the minimum requirement for TRS formation. Warm ocean water must exist over a sufficient depth of at least 50 meter. These warm waters are necessary to fuel the heat engine of the tropical cyclone.

Why do wind speeds slow down over land?

Why do wind speeds slow down over land? [Rougher land surfaces provide friction, slowing winds down. Also, the heat of evaporated water condensing into clouds is cut off over land.]

Why do tornadoes have such high wind speeds?

Well, the strongest winds in a tornado occur when air from outside the tornado can flow closest to the center of the vortex. The conservation of angular momentum, e.g., the rotation in the air, requires that as the air flows toward the center of the tornado (as it spirals in) its rotation must increase.

What are the conditions for a TRS to occur?

A TRS is confirmed if the foregoing conditions are met and the barometric pressure falls more than 5 mb below normal. Wind: Wind speed and directions are usually constant in the tropics but if an appreciable change in the direction or strength of the wind indicates a Tropical Revolving Storm (TRS) in vicinity.

What is the difference between a TRS and a swell?

Swell travels much faster than the speed of the TRS. Swell travels thousand miles and hence it can be experienced by a vessel at thousand miles away. Swell usually is the first indication of an TRS in the vicinity. If the you can observe the direction of swell properly you can get a rough idea regarding the centre of the Storm.

What is the difference between track and path in TRS?

Somewhere along their track, they curve away from the equator – curve to N and then recurve to NE in the NH; curve to S and then recurve to SE in the SH. Track – The route over which a TRS is already passed. Path – The predicted route, over which, there is a possibility of the TRS passing at near future.

How do you know when a storm is approaching TRS?

Swell is usually the first indication of the storm centre, hence an approaching TRS. Pressure will be very much lower than the normal. When barometric pressure falls below 5 MB than normal, along with other TRS confirmation factors, the approach of TRS is confirmed.