Tropical Storm Mekkhala (2015)

Severe Tropical Storm Mekkhala,[nb 1] known in the Philippines as Severe Tropical Storm Amang, was an early-season tropical cyclone that made landfall over the Philippines in January 2015. Mekkhala killed three people in the Bicol Region and caused light crop damage. Notably, the storm disturbed Pope Francis’ visit to the country after the victims of Typhoon Haiyan on November 8, 2013. Although the storm also caused an airplane crash in Tacloban, nobody was hurt in the incident.

This article is about the 2015 tropical cyclone. For other storms of the same name, see Tropical Storm Mekkhala.

Severe Tropical Storm Mekkhala (Amang)
Severe Tropical Storm Mekkhala at peak intensity on January 17
Meteorological history
FormedJanuary 13, 2015
DissipatedJanuary 21, 2015
Severe tropical storm
10-minute sustained (JMA)
Highest winds110 km/h (70 mph)
Lowest pressure975 hPa (mbar); 28.79 inHg
Category 1-equivalent typhoon
1-minute sustained (SSHWS/JTWC)
Highest winds130 km/h (80 mph)
Lowest pressure970 hPa (mbar); 28.64 inHg
Overall effects
Fatalities3 total
Damage$8.92 million (2015 USD)
Areas affectedCaroline Islands, Philippines
IBTrACS
Part of the 2015 Pacific typhoon season

The system developed on January 13 between the Philippines and Guam. Moving west-northwest for its duration, Mekkhala passed north of Yap State on January 14 while slowly intensifying due to moderate wind shear. Conditions became more favorable on January 16, when the storm quickly strengthened to peak winds of at least 110 km/h (70 mph); a ragged eye prompted the American-based Joint Typhoon Warning Center (JTWC) to upgrade it to a typhoon. The storm weakened slightly and made landfall on the Philippine island of Samar on January 17. Mekkhala weakened further over land, dissipating on January 21 east of Luzon.

Meteorological history
Map plotting the storm's track and intensity, according to the Saffir–Simpson scale
Map key
Saffir–Simpson scale
  Tropical depression (≤38 mph, ≤62 km/h)
  Tropical storm (39–73 mph, 63–118 km/h)
  Category 1 (74–95 mph, 119–153 km/h)
  Category 2 (96–110 mph, 154–177 km/h)
  Category 3 (111–129 mph, 178–208 km/h)
  Category 4 (130–156 mph, 209–251 km/h)
  Category 5 (≥157 mph, ≥252 km/h)
  Unknown
Storm type
triangle Extratropical cyclone, remnant low, tropical disturbance, or monsoon depression

Tropical Storm Mekkhala was first noted as a tropical disturbance on January 11, while it was located within a marginal environment for further development, about 205 km (125 mi) to the south-southwest of Chuuk State in the Federated States of Micronesia.[2] At this time the system's low level circulation centre was broad and ill-defined, with a large band of deep atmospheric convection flaring along the centre's northern edge.[2] Over the next day the system moved westwards into a more favourable environment, with atmospheric convection wrapping into a slowly-consolidating low-level circulation center.[3] The Japan Meteorological Agency subsequently started to monitor the system as a tropical depression early on January 13.[nb 2][5] Later that day the United States Joint Typhoon Warning Center initiated advisories on the system and classified it as Tropical Depression 01W, despite tropical storm force winds of 65 km/h (40 mph) occurring on the northern side of the system.[nb 3][7][8]

Although deep convection was displaced to the northwest of an exposed LLCC early on January 14, the JMA still upgraded the system to a tropical storm and named it Mekkhala, under moderate vertical wind shear offset by excellent poleward outflow.[9][10] In post-season analysis, the agency upgraded the storm at 12:00 UTC on the previous day.[11] Late on January 14, the PAGASA named the storm Amang right after it entered the Philippine Area of Responsibility.[12]

Severe Tropical Storm Mekkhala making landfall over the Samar

Tracking west-northwestward and then westward along the southern periphery of a subtropical ridge, Mekkhala was upgraded to a tropical storm by the JTWC early on January 15, due to its slightly improved structure.[13] Mekkhala quickly intensified on the next day due to improved conditions; the wind shear became in-phase with the storm's motion while the robust divergent outflow persisted.[14] Therefore, the JMA upgraded the system to a severe tropical storm at 06:00 UTC on January 16,[11] and later that day the JTWC upgraded it to a typhoon, when a central dense overcast has significantly deepened and totally obscured the LLCC.[14] Later, a microwave imagery revealed that Mekkhala formed a ragged eyewall structure.[15] The system reached peak intensity at 00:00 UTC on January 17 with ten-minute maximum sustained winds of 110 km/h (70 mph),[11] although operationally the JMA estimated typhoon-force winds of 130 km/h (80 mph).[16]

After slightly weakening, Mekkhala tracked northwestward and made landfall over Dolores, Eastern Samar of the Philippines at around 15:00 Philippine Standard Time (07:00 UTC), where Typhoon Hagupit also made landfall the month before.[17] Both the JMA and the JTWC downgraded Mekkhala to a tropical storm on January 17, due to land interaction weakening the storm significantly.[18][19][20] Mekkhala weakened further while crossing the Bicol Region on January 18, leading the JTWC to downgrade it to a tropical depression when it turned northward and emerged into the Philippine Sea.[21] Late on the same day, the JMA downgraded Mekkhala to a tropical depression, and shortly after the JTWC issued the final warning as strong wind shear exposed the LLCC.[22] The tropical depression drifted northeastward and maintained its exposed low-level circulation east of Luzon, until the system was completely absorbed by a stationary front early on January 21.[23][24]

Impact
Animation of issued PSWS for Tropical Storm Mekkhala (Amang) when crossing and skirting the Philippines.
The site of the Papal Mass in Tacloban on January 17

During January 14, Mekkhala passed about 95 km (60 mi) to the north of Yap State and less than 45 km (30 mi) to the south of the atoll Ulithi.[25] A peak wind gust of 58 km/h (36 mph) was recorded in Yap State, along with a rainfall total of around 13 mm (0.5 in).[25] On Ulithi a rainfall total of 100 mm (4 in) was recorded, while there were no reports of any deaths or significant damage on either Ulithi or in Yap State.[25]

Severe Tropical Storm Mekkhala, also known as Tropical Storm Amang, killed three people in the Bicol Region of the Philippines. Damage in the region amounted to ₱318.7 million (US$7.13 million), stemming mostly from agriculture.[26] In addition, the storm caused agricultural damage of ₱30.3 million (US$678,000) in Samar.[27] The crop damage and a subsequent drought caused rice shortages in the country, prompting the government to import the grain in May 2015.[28] Throughout the country, 48 homes were destroyed while a further 490 sustained damage.[27] Infrastructural losses reached ₱49.7 million (US$1.11 million); repairs to roadways was quick and completed by January 21.[26] A volunteer from the Bicol Region, who worked for a Catholic Relief Services station in Salcedo, Eastern Samar, was hit by a soundbox due to a collapsed scaffolding caused by heavy winds during a papal Mass held in Daniel Z. Romualdez Airport in Tacloban, Leyte.[29]

To comfort Tacloban people who suffered from the devastation caused by Typhoon Haiyan in 2013, and Typhoon Hagupit a month prior, Pope Francis visited the storm-ravaged city on January 17. However, the schedule was significantly impacted by Severe Tropical Storm Mekkhala and thousands of pilgrims and the Pope wore their raincoats during the rain-soaked Mass in the airport.[30] Only minutes after Pope Francis’ aircraft left the airport, a private jet was veered off the runway by strong winds of Mekkhala and eventually crashed. The 15 passengers on the plane were all safe, including officials from the Cabinet of the Philippines.[31]

Highest Public Storm Warning Signal
PSWS#LUZONVISAYASMINDANAO
PSWS #2Catanduanes, Albay, Camarines Norte, Camarines Sur, Southern Quezon incl. Polillo Island, Sorsogon, MasbateNorthern Samar, Eastern Samar, Samar, BiliranNONE
PSWS #1Metro Manila, Cavite, Laguna, Rizal, Batangas, Bulacan, Nueva Ecija, Aurora, Quirino, Isabela, rest of Quezon, Marinduque, Oriental Mindoro, RomblonLeyte, Southern Leyte, extreme Northern Cebu incl. Bantayan and Camotes IslandNONE

See also

Notes
  1. The name Mekkhala was submitted to the World Meteorological Organization by Thailand and comes from the Thai angel of thunder Manimekhala (Thai: มณีเมขลา).[1]
  2. The Japan Meteorological Agency is the official Regional Specialized Meteorological Center for the western Pacific Ocean.[4]
  3. The Joint Typhoon Warning Center is a joint United States Navy – United States Air Force task force that issues tropical cyclone warnings for the western Pacific Ocean and other regions.[6]

References
  1. "List of names for tropical cyclones adopted by the ESCAP/WMO Typhoon Committee for the western North Pacific and the South China Sea (valid as of 2015)". Japan Meteorological Agency. 2015. Archived from the original on April 1, 2015. Retrieved March 24, 2015.
  2. "Significant Tropical Weather Advisory for the Western and South Pacific Oceans January 11, 2015 11z". United States Joint Typhoon Warning Center. Archived from the original on January 12, 2015. Retrieved July 31, 2016.
  3. "Tropical Cyclone Formation Alert". Joint Typhoon Warning Center. Archived from the original on January 21, 2015. Retrieved January 19, 2015.
  4. "Annual Report on Activities of the RSMC Tokyo - Typhoon Center 2000" (PDF). Japan Meteorological Agency. February 2001. p. 3. Retrieved July 9, 2013.
  5. Tropical Storm Mekkhala (RSMC Tropical Cyclone Best Track). Japan Meteorological Agency. February 17, 2015. Archived from the original on December 19, 2014. Retrieved July 9, 2016.
  6. "Joint Typhoon Warning Center Mission Statement". Joint Typhoon Warning Center. United States Navy. 2011. Archived from the original on July 26, 2007. Retrieved July 9, 2013.
  7. "JTWC 2015 best track analysis: Tropical Storm 01W: Mekkhala" (DAT). United States Joint Typhoon Warning Center. Retrieved August 1, 2016.
  8. "Prognostic Reasoning for Tropical Depression 01W January 13, 2015 09z". United States Joint Typhoon Warning Center. January 13, 2015. Archived from the original on January 13, 2015. Retrieved August 1, 2016.
  9. "RSMC Tropical Cyclone Advisory 140600". Japan Meteorological Agency. Archived from the original on January 14, 2015. Retrieved January 19, 2015.
  10. "Prognostic Reasoning for Tropical Depression 01W (One) Warning Nr 04". Joint Typhoon Warning Center. Archived from the original on January 14, 2015. Retrieved January 19, 2015.
  11. RSMC Tokyo — Typhoon Center (February 17, 2015). Tropical Storm Mekkhala Best Track 2015-02-17T07:00:00Z (Report). Japan Meteorological Agency. Retrieved August 6, 2015.
  12. "Severe Weather Bulletin Number One". PAGASA. Archived from the original on January 15, 2015. Retrieved January 19, 2015.
  13. "Prognostic Reasoning for Tropical Storm 01W (Mekkhala) Warning Nr 07". Joint Typhoon Warning Center. Archived from the original on January 15, 2015. Retrieved January 19, 2015.
  14. "Prognostic Reasoning for Typhoon 01W (Mekkhala) Warning Nr 14". Joint Typhoon Warning Center. Archived from the original on January 17, 2015. Retrieved January 19, 2015.
  15. "SSMIS Microwave Imagery of Typhoon 01W (Mekkhala) at 2223Z on January 16, 2015" (JPEG). US Naval Research Laboratory, Marine Meteorology. Retrieved January 19, 2015.
  16. "RSMC Tropical Cyclone Advisory 170000". Japan Meteorological Agency. Archived from the original on January 17, 2015. Retrieved January 19, 2015.
  17. "SitRep. No. 06 re Effects of Tropical Storm "AMANG" (MEKKHALA)" (PDF). National Disaster Risk Reduction and Management Council. Archived from the original (PDF) on January 18, 2015. Retrieved January 19, 2015.
  18. "RSMC Tropical Cyclone Advisory 171500". Japan Meteorological Agency. Archived from the original on January 18, 2015. Retrieved January 19, 2015.
  19. "RSMC Tropical Cyclone Advisory 170900". Japan Meteorological Agency. Archived from the original on January 18, 2015. Retrieved January 19, 2015.
  20. "Prognostic Reasoning for Tropical Storm 01W (Mekkhala) Warning Nr 17". Joint Typhoon Warning Center. Archived from the original on January 18, 2015. Retrieved January 19, 2015.
  21. "Prognostic Reasoning for Tropical Depression 01W (Mekkhala) Warning Nr 21". Joint Typhoon Warning Center. Archived from the original on January 18, 2015. Retrieved January 19, 2015.
  22. "Tropical Depression 01W (Mekkhala) Warning Nr 022A Amended and Relocated". Joint Typhoon Warning Center. Archived from the original on January 19, 2015. Retrieved January 19, 2015.
  23. "Marine Weather Warning for GMDSS Metarea XI 2015-01-21T00:00:00Z". GISC Tokyo. Japan Meteorological Agency. Retrieved January 21, 2015.
  24. "Marine Weather Warning for GMDSS Metarea XI 2015-01-21T06:00:00Z". GISC Tokyo. Japan Meteorological Agency. Retrieved January 21, 2015.
  25. Pacific El Nino-Southern Oscillation (ENSO) Applications Climate Center (May 29, 2015). "Pacific ENSO Update: 2nd Quarter 2015" (PDF). 21 (2). {{cite journal}}: Cite journal requires |journal= (help)
  26. Mar S. Arguelles (January 21, 2015). "Storm 'Amang' leaves 3 people dead, P318.7M in damages in Bicol". Philippine News Agency. Interaksyon. Archived from the original on April 2, 2015. Retrieved March 24, 2015.
  27. "SitRep No. 10 re Effects of Tropical Storm "Amang" (MEKKHALA)" (PDF). National Disaster Risk Reduction and Management Council. January 20, 2015. Archived from the original (PDF) on January 22, 2015. Retrieved January 23, 2015.
  28. Alladin S. Diega (May 22, 2015). "El NiAo forces PHL to import more rice". The Business Mirror. – via Lexis Nexis (subscription required)
  29. "Pope offers prayers for volunteer who died after Tacloban papal Mass". GMA News. Retrieved January 19, 2015.
  30. Levine, Brittany (January 16, 2015). "New typhoon soaks Pope Francis' trip to storm-ravaged Philippine city". Mashable. Retrieved January 20, 2015.
  31. Arcangel, Xianne (January 17, 2015). "They're all safe: Ochoa, Coloma on light plane that skidded in Tacloban". GMA News. Retrieved January 20, 2015.
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