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Satellite imagery of Super Typhoon Nida

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Satellite imagery of Super Typhoon Nida

The Hong Kong Observatory uses a new tropical cyclone classification scheme with effect from 2009 (see previous article on this).  It consists of 6 categories as follows:

Tropical Cyclone Classification Maximum sustained winds near the centre (km/h)
Tropical Depression (TD) <63
Tropical Storm (TS) 63-87
Severe Tropical Storm (STS) 88-117
Typhoon (T) 118-149
Severe Typhoon (ST) 150-184
Super Typhoon (SuperT) 185 or above

In November 2009, Nida over the western North Pacific developed into a Super Typhoon.  It had gone through all the 6 intensity classifications during its life cycle.  Satellite pictures capturing images of Nida during each of the intensity classifications are shown below.  This series of satellite pictures constitutes a good reference for readers interested in tropical cyclone.  From the series of satellite pictures, the increasingly organized banding feature of Nidas cloud as a swirl became progressively more prominent as it intensified from a tropical depression into a severe tropical storm (Figure 1-3).  An eye developed as Nida intensified into a typhoon (Figure 4) and the eye became smaller and yet more well-defined as Nida developed further into a super typhoon (Figure 5-6).

TD

Figure 1.    Tropical Depression Nida as shown on IR Satellite Picture at 00 UTC on 23 November 2009. (Japan Meteorological Agency MTSAT-1R infra-red satellite image)

TS

Figure 2.  Tropical Storm Nida as shown on IR satellite picture at 18 UTC on 23 November 2009. (Japan Meteorological Agency MTSAT-1R infra-red satellite image)

STS

Figure 3.  Severe Tropical Storm Nida as shown on IR satellite picture at 18 UTC on 24 November 2009. (Japan Meteorological Agency MTSAT-1R infra-red satellite image)

T

Figure 4.  IR satellite picture at 00 UTC on 25 November showing Nida intensified into a typhoon. (Japan Meteorological Agency MTSAT-1R infra-red satellite image)

SevT

Figure 5.  Nida continued to strengthen further on 25 November to a severe typhoon. (Japan Meteorological Agency MTSAT-1R infra-red satellite image)

SupT

Figure 6.  IR satellite picture at 12 UTC on 25 November 2009 showing Nida became a super typhoon. (Japan Meteorological Agency MTSAT-1R infra-red satellite image)