There are several factors which, together, help explain why disastrous consequences were avoided from Phailin.
1) Effective storm warnings: The Indian Meteorological Department, for several days, provided credible information about Phailin, which helped motivate the preparation and response effort.
2) Evacuations: India conducted its largest storm evacuation ever, re-locating more than 900,000 people from the coast to shelters in schools and government offices.
3) Location of Phailin’s landfall and its geography: Phailin washed ashore near Brahmapur about 100 miles farther south than Odisha did in 1999. In this region, the continental shelf is steeper, meaning there was less low-lying terrain vulnerable to storm surge (the wall of water pushed ashore by the storm’s winds) flooding.
4) The storm substantially weakened prior to and during landfall: At landfall, Phailin’s maximum sustained winds were around 125-140 mph whereas they may have been 160 mph or even higher in the 24 hours preceding. The storm surge peaked at around 13 feet, not the 20+ feet feared. The storm weakened for three possible reasons.
* Its core was re-organizing (in the midst of an eyewall replacement cycle)
* It was moving slowly enough prior to landfall to stir up cold water from deep water underneath. This upwelling process caused sea surface temperatures to cool as much as 8-10 degrees Celsius in the storm’s wake! (The steep shelf discussed above meant the water was deep enough for such a cold layer of water to be tapped.)
* Its interaction with land
5) The storm’s intensity may have been overestimated (by some sources, including some we cited): While the Joint Typhoon Warning Center and other U.S. forecasters estimated the storm’s peak intensity reached category 5 levels, the Indian Meteorological Department did not. While the Indian Meteorological Department predicted a serious storm (and its predictions motivated the massive preparation efforts), its forecasts were not as dire as some others. Assessing the intensity of a tropical cyclone in the Indian Ocean (and Bay on Bengal) is different from other ocean basins, and the regional expertise of the Indian Meteorological Department may have proven superior.
“They have been issuing warnings, and we have been contradicting them,” said L.S. Rathore, director-general of the Indian Meteorological Department. “That is all that I want to say.”
“As a scientist, we have our own opinion and we stuck to that. We told them that is what is required as a national weather service — to keep people informed with the reality without being influenced by over-warning,” Rathore added, according to the Associated Press.