Typhoon Damrey (2017)

Map plotting the track and the intensity of the storm, according to the Saffir–Simpson scale

On October 31, the Japan Meteorological Agency (JMA) began monitoring on a weak tropical depression that had developed approximately 349 km (217 mi) to the west of Cebu.[2] Six hours later, the JMA began issuing advisories on the system after winds near its center has reached about 55 km/h (35 mph).[3] By about 21:00 UTC of the same day, the PAGASA had classified the system as a tropical depression, assigning the local name Ramil.[4] Around the same time, the Joint Typhoon Warning Center (JTWC) had issued a Tropical Cyclone Formation Alert on the system.[5]

By November 1, the JTWC had classified Ramil to a tropical depression, giving the international designation of 28W,[6] after convection around its low-level circulation center (LLCC) began to consolidate.[7] Thereafter, on November 2, the JMA upgraded the system to a tropical storm, receiving the name Damrey, the twenty-third named storm of the season.[8] After the system was located over in a favorable environment including continuous convective organization, the JTWC followed suit on upgrading it to a tropical storm.[9] Satellite imagery later depicted deep convective banding wrapping into its LLCC which caused Damrey to further strengthen.[10] By 18:00 UTC of the same day, Damrey strengthened into a severe tropical storm by the JMA.[11] Shortly thereafter, the structure of the storm had become symmetric with much deeper convection and an improved radial outflow. Vertical wind shear was also very low at around 5 knots, which is favorable for a cyclone to develop even further.[12]

The JMA upgraded Damrey to a typhoon early on November 3.[13] Three hours later, the JTWC followed suit and classified it as a Category 1-equivalent typhoon,[14] after animated satellite imagery depicted a "strengthening" system and a well-defined circular eye feature.[15] At this stage, Damrey was located in conditions of low shear and warm sea-surface temperatures of 27–28 °C (81–82 °F) with good outflow.[16] The JMA had already declared that Damrey reached its peak intensity with 10-minute sustained winds of 130 km/h (80 mph) and a minimum barometric pressure of 970 hPa.[17] Six hours later, microwave images showed the eye becoming well-defined and an improved storm structure with a large centralized convective mass occluding to its center.[18] By 21:00 UTC, the JTWC upgraded Damrey to a Category 2-equivalent typhoon, reaching its peak strength with 1-minute sustained winds of 165 km/h (105 mph).[19] The JTWC issued their final advisory on the typhoon on 03:00 UTC on November 4, as it made landfall in Vạn Ninh District, Khánh Hòa Province, Vietnam as its convective structure started to deteriorate.[20] Three hours later, the JMA downgraded Damrey to a severe tropical storm,[21] then to a tropical storm.[22] The JMA issued their final advisory on 12:00 UTC on November 4.[23] The agency continued to track the system as it fully dissipated on 00:00 UTC on November 5.[24]

• Other tropical cyclones named Damrey
• Typhoon Lola (1993)
• Typhoon Lingling (2001)
• Typhoon Mirinae (2009)
• Tropical Storm Podul (2013)

Wikimedia Commons has media related to Typhoon Damrey (2017).

• JMA General Information of Typhoon Damrey (1723) from Digital Typhoon
• 28W.DAMREY from the U.S. Naval Research Laboratory
• Severe Weather Bulletin at PAGASA