What is the structure of the Typhoon? Typhoon eye, eye wall, spiral rain belt anatomy

The mature typhoon is divided from the inside to the outside into typhoon eye, eye wall, and spiral rain belt three parts.

Three layers of Typhoon

From the satellite cloud chart, the mature Typhoon is like a giant rotating disk, usually 600-1000km in diameter, divided into three parts from the inside to the outside:

Typhoon Eye (approximately 10 to 60 km in diameter)

Typhoon center wind-free zone. downstream air flow disperses the clouds, and you can even see the blue sky. air pressure is the lowest in the field, but the sea can have huge waves (the waves of the direction gather here).

The eye wall/eye wall (Typhoon's ring cloud wall outside the eye)

Typhoon's most violent region—— The strongest winds, the strongest rains are here.The eye walls are made up of sharply rising cloud columns, up to a height of more than 15 km.The Typhoon early warning says the biggest wind force near the center", actually appears in the eye wall.

Spiral Rain Bands (extended hundreds of kilometers toward)

A strip of rainfall that rotates around the center, a strip of rainfall that enters from the outer perimeter." The intermittent weather that stopped" during a period of Rainstorm when Typhon was experienced, was the result of the spiral rain belt passing through.

Why Typhoon can't go outside when it's eye transit

Typhoon eye transit storm stalled, many people mistakenly thought Typhoon was gone.The calm may only last for a few minutes., then reached the side wall of the eye, the Rainstorm instantly recovered and wind direction opposite – the defenseless person is extremely vulnerable to injury.

Eye Wall Replacement: Severe Typhoon's" Replacement Process"

Severe Typhoon often appears " double eye wall " phenomenon: the outside forms a new eye wall, the inside old eye wall gradually disappears. during the replacement Intensity briefly weakened, the rear eye wall radius grew, the range of strong wind instead expanded.This is one of the difficulties of ForecastTyphoon Intensity change, and is also a common source of differences in the multi-agency Forecast contrast.