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Cyclone Nargis

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Very Severe Cyclonic Storm Nargis
Extremely severe cyclonic storm (IMD scale)
Category 4 tropical cyclone (SSHWS)
Cyclone Nargis on May 1
FormedApril 27, 2008
DissipatedMay 3, 2008
Highest winds3-minute sustained: 165 km/h (105 mph)
1-minute sustained: 215 km/h (135 mph)
Lowest pressure962 hPa (mbar); 28.41 inHg
Areas affectedBurma
Part of the 2008 North Indian Ocean cyclone season

Cyclone Nargis (JTWC designation: 01B, also known as Very Severe Cyclonic Storm Nargis) was the first tropical cyclone to make landfall on Burma since Cyclone Mala in 2006.

Storm history

In the last week of April, an area of deep convection persisted near a low-level circulation in the Bay of Bengal about 1150 km (715 mi) east-southeast of Chennai, India. With good outflow and low wind shear, the system slowly organized as its circulation consolidated. At 0300 UTC on April 27, the India Meteorological Department (IMD) classified the system as a depression, and nine hours later the system intensified into a deep depression. At the same time, the Joint Typhoon Warning Center classified it as Tropical Cyclone 01B. With a ridge to its north, the system tracked slowly north-northwestward as banding features improved. At 0000 UTC on April 28, the IMD upgraded the system to Cyclonic Storm Nargis while it was located about 550 km (340 mi) east of Chennai, India.

On April 28, the motion of Nargis became nearly stationary while located between ridges to its northwest and southeast. That day, the JTWC upgraded the storm to cyclone status, or the equivalence of a minimal hurricane on the Saffir-Simpson hurricane scale. At around the same time, the IMD upgraded Nargis to a severe cyclonic storm. The cyclone developed a concentric eye feature, which is an eyewall outside the inner dominant eyewall, with warm waters aiding in further intensification. Early on April 29, the JTWC estimated Nargis reached winds of 160 km/h (100 mph), and at the same time the IMD classified the system as a very severe cyclonic storm. Subsequently, the cyclone became disorganized and weakened due to subsidence and drier air; as a result, deep convection near the center markedly decreased. At the same time, the storm began a motion to the northeast around the periphery of a ridge to its southeast. The circulation remained strong despite the diminishing convection, though satellite intensity estimates using the Dvorak technique indicated the cyclone could have weakened to tropical storm status. By late on April 29, convection had begun to rebuild, though immediate restrengthening was prevented by increased wind shear.

On May 1, after turning nearly due eastward, Cyclone Nargis began rapidly intensifying, due to greatly improved outflow in association with an approaching upper-level trough. Strengthening continued as it developed a well-defined eye with a diameter of 19 km (12 mi), and early on May 2 the JTWC estimated the cyclone reached peak winds of 215 km/h (135 mph) as it approached the coast of Burma.

Preparations

Impact

See also

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References

  1. Charlie Forecast Team (2008). "April 25 Significant Tropical Weather Advisory". Joint Typhoon Warning Center. Retrieved 2008-05-02.
  2. Charlie Forecast Team (2008). "April 26 Significant Tropical Weather Advisory". Joint Typhoon Warning Center. Retrieved 2008-05-02.
  3. India Meteorological Department (2008). "Depression over southeast Bay of Bengal". Retrieved 2008-05-02.
  4. India Meteorological Department (2008). "Deep Depression over southeast and adjoining Southwest Bay of Bengal". Retrieved 2008-05-02.
  5. Joint Typhoon Warning Center (2008). "Tropical Cyclone 01B Warning NR 001". Retrieved 2008-05-02.
  6. Joint Typhoon Warning Center (2008). "Tropical Cyclone 01B Warning NR 002". Retrieved 2008-05-02.
  7. India Meteorological Department (2008). "Cyclonic storm "NARGIS" over southwest and adjoining southeast and westcentral Bay of Bengal". Retrieved 2008-05-02.
  8. Joint Typhoon Warning Center (2008). "Cyclone Nargis Warning NR 004". Retrieved 2008-05-02.
  9. India Meteorological Department (2008). "Severe Cyclonic storm "NARGIS" over southwest and adjoining southeast and westcentral Bay of Bengal". Retrieved 2008-05-02.
  10. Joint Typhoon Warning Center (2008). "Cyclone Nargis Warning NR 005". Retrieved 2008-05-02.
  11. Joint Typhoon Warning Center (2008). "Cyclone Nargis Warning NR 006". Retrieved 2008-05-02.
  12. Joint Typhoon Warning Center (2008). "Cyclone Nargis Warning NR 007". Retrieved 2008-05-02.
  13. India Meteorological Department (2008). "Very Severe Cyclonic storm "NARGIS" over westcentral and adjoining southwest and southeast Bay of Bengal". Retrieved 2008-05-02.
  14. Joint Typhoon Warning Center (2008). "Cyclone Nargis Warning NR 008". Retrieved 2008-05-02.
  15. Joint Typhoon Warning Center (2008). "Cyclone Nargis Warning NR 009". Retrieved 2008-05-02.
  16. Joint Typhoon Warning Center (2008). "Cyclone Nargis Warning NR 010". Retrieved 2008-05-02.
  17. Joint Typhoon Warning Center (2008). "Cyclone Nargis Warning NR 012". Retrieved 2008-05-02.
  18. Joint Typhoon Warning Center (2008). "Cyclone Nargis Warning NR 017". Retrieved 2008-05-02.
  19. Joint Typhoon Warning Center (2008). "Cyclone Nargis Warning NR 020". Retrieved 2008-05-02.