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Tropical Storm Narda
Tropical storm (SSHWS/NWS)
Tropical Storm Narda near peak intensity off the coast of Sinaloa on September 30
FormedSeptember 29, 2019
DissipatedOctober 1, 2019
Highest winds1-minute sustained: 50 mph (85 km/h)
Lowest pressure998 mbar (hPa); 29.47 inHg
Fatalities6 total
DamageUnknown
Areas affectedWestern Mexico, Baja California Peninsula, Southwestern United States
Part of the 2019 Pacific hurricane season

Tropical Storm Narda was a short-lived tropical storm that remained close to the Pacific coast of Mexico, causing flash flooding and mudslides in southwestern Mexico and the Baja California Peninsula in late September 2019. The fourteenth named storm of the 2019 Pacific hurricane season, Narda developed from a broad area of low pressure that formed off the Central American coast on September 26. The broad low gradually organized as it moved west-northwestward, and it became Tropical Storm Narda early on September 29 while located off the southern coast of Mexico. The cyclone strengthened slightly before it moved inland near Manzanillo, Mexico. Narda weakened to a tropical depression after moving inland, but restrengthened into a tropical storm on September 30 as it emerged over the Pacific Ocean just south of the Gulf of California. Narda quickly strengthened, and reached its peak intensity with winds of 50 mph (85 km/h) that day before making a second landfall along the northwestern coast of Mexico. The tropical cyclone weakened rapidly as it moved along the coastline, and it weakened to a tropical depression before dissipating just off the coast of Sonora on October 1.

Meteorological history

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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

On September 23, the National Hurricane Center (NHC) noted the potential for an area of low pressure to form south of the southern coast of Mexico over that coming weekend.[1] A broad and elongated trough (meteorology) of low pressure developed near the coast of Central America on September 26, and a broad area of low pressure developed along this trough two days later south-southeast of Acapulco.[2] The disturbance continued to gradually become better organized through the following day, and although it still lacked a well-defined center of circulation, the threat of tropical storm-force winds along the southwestern coast of Mexico prompted the initiation of advisories on Potential Tropical Cyclone Sixteen-E at 15:00 UTC on September 28.[3] Early on the following day, the disturbance's circulation became better defined, and an increase in convective banding occurred over the western portion of the broad system. As a result, the NHC classified the system as Tropical Storm Narda at 03:00 UTC on September 29.[4]

Moving slowly northward toward the southern coast of Mexico, Narda gradually became better organized and strengthened to an initial peak intensity with winds of 45 mph (75 km/h) as banding features became evident.[5] However, later that day, satellite imagery and radar data from coastal stations in Mexico indicated that the center of Narda relocated further north and close to the coast of Mexico near Zihuatanejo.[6] As it moved inland, Narda quickly became less organized, and the cyclone weakened to a tropical depression at 21:00 UTC as the center moved over the mountains of southwestern Mexico.[7]

Narda emerged over the eastern Pacific Ocean early on September 30 near the Islas Marías as a poorly-organized tropical depression.[8] However, the cyclone continued to produce a large area of deep convection near and west of its center, and it soon restrengthened into a tropical storm at 15:00 UTC that day.[9] Throughout the day, Narda continued to become better organized as it moved over the warm waters of the Gulf of California. Microwave imagery revealed the presence of well-defined banding features and a mid-level eye feature located just off the Mexican coast, and Narda reached its peak intensity with maximum sustained winds of 50 mph (85 km/h) at 21:00 UTC on September 30.[10] Six hours later, Narda made its second landfall along the northwestern coast of Mexico near Topolobampo as a slightly weaker cyclone with winds of 45 mph (75 km/h).[11] Narda continued to weaken as it hugged the northwestern coast of Mexico, and by 12:00 UTC on October 1 it had weakened to a tropical depression while just off the coast.[12] The cyclone continued to rapidly weaken, and three hours later, Narda dissipated near the northwestern coast of Mexico.[13]

Preparations and impact

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Tropical Storm Narda near the southern coast of Mexico on September 29

Upon the initiation of advisories on Potential Tropical Cyclone Sixteen-E on September 28, the Government of Mexico issued a tropical storm warning along the southwestern coast of Mexico from Acapulco to [[Cabo Corrientes]].[14] These warnings were discontinued at 21:00 UTC on September 29 after Narda had moved inland and weakened.[15] However, six hours later, tropical storm warnings were again issued, this time for the northwestern coast of Mexico from San Blas to Topolobampo, while a tropical storm watch was also issued northward to Guaymas.[16] The watch was upgraded to a warning at 15:00 UTC on September 30 as Narda approached the coast.[17] All warnings were discontinued on October 1 after Narda had once again weakened to a tropical depression.[18]

Remaining near the coast of western Mexico for three days, Narda produced heavy rainfall and triggered flash flooding in mudslides across much of western Mexico. In Oaxaca, two deaths occured as a result of the storm. A 26-year old man died after he was dragged by strong river currents in San Pedro Mixtepec, Miahuatlán. A 17-year old boy drowned after he was dragged by strong currents along the San Cristóbal River in the community of San Jerónimo Coatlán, Sierra Sur de Oaxaca.[19] In the Tecomán Municipality, Colima, a 29-year old man died after he was dragged away by strong currents while fishing on his boat in the Alcuzahue Lagoon.[20] In the municipality of Malinaltepec, Guerrero, more than 70 homes were damaged and 55 families were displaced as a result of the effects of Narda, and a 28-year old man lost his life after he was trapped under a mudslide while traveling on the Tlapa-Marquelia highway. 23 roads in the municipality were damaged and forced to close, and 17 communities lost power as a result of the storm.[21] In Jalisco, 834 homes in the municipalities of Villa Purificación, Tomatlán, and Cabo Corrientes were damaged, and schools across the 30 municipalities of Jalisco were closed on September 30. The Aquiles Serdán bridge connecting Cabo Corrientes with several communities collapsed due to flooding, and there were two reported fatalities as a result of the storm in Jalisco.[22]

See also

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References

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  1. ^ David Zelinsky (September 23, 2019). "Five-Day Graphical Tropical Weather Outlook". Miami, Florida: National Hurricane Center. Retrieved October 3, 2019.
  2. ^ Lixion A. Avila (September 28, 2019). "Five-Day Graphical Tropical Weather Outlook". Miami, Florida: National Hurricane Center. Retrieved October 3, 2019.
  3. ^ Lixion A. Avila (September 28, 2019). "Potential Tropical Cyclone Sixteen-E Advisory Number 1". Miami, Florida: National Hurricane Center. Retrieved October 3, 2019.
  4. ^ Daniel P. Brown (September 29, 2019). "Tropical Storm Narda Discussion Number 3". Miami, Florida: National Hurricane Center. Retrieved October 3, 2019.
  5. ^ Richard J. Pasch (September 29, 2019). "Tropical Storm Narda Discussion Number 4". Miami, Florida: National Hurricane Center. Retrieved October 3, 2019.
  6. ^ John L. Beven II (September 29, 2019). "Tropical Storm Narda Tropical Cyclone Update". Miami, Florida: National Hurricane Center. Retrieved October 3, 2019.
  7. ^ John L. Beven II (September 29, 2019). "Tropical Depression Narda Advisory Number 6". Miami, Florida: National Hurricane Center. Retrieved October 3, 2019.
  8. ^ Richard J. Pasch (September 30, 2019). "Tropical Depression Narda Intermediate Advisory Number 7A". Miami, Florida: National Hurricane Center. Retrieved October 3, 2019.
  9. ^ Daniel P. Brown (September 30, 2019). "Tropical Storm Narda Advisory Number 9". Miami, Florida: National Hurricane Center. Retrieved October 3, 2019.
  10. ^ Daniel P. Brown (September 30, 2019). "Tropical Storm Narda Discussion Number 10". Miami, Florida: National Hurricane Center. Retrieved October 3, 2019.
  11. ^ Stacy R. Stewart (October 1, 2019). "Tropical Storm Narda Advisory Number 11". Miami, Florida: National Hurricane Center. Retrieved October 3, 2019.
  12. ^ David Zelinsky (October 1, 2019). "Tropical Depression Narda Intermediate Advisory Number 12A". Miami, Florida: National Hurricane Center. Retrieved October 3, 2019.
  13. ^ David Zelinsky (October 1, 2019). "Remnants of Narda Advisory Number 13". Miami, Florida: National Hurricane Center. Retrieved October 3, 2019.
  14. ^ Lixion A. Avila (September 28, 2019). "Potential Tropical Cyclone Sixteen-E Advisory Number 1". Miami, Florida: National Hurricane Center. Retrieved October 3, 2019.
  15. ^ John L. Beven II (September 29, 2019). "Tropical Depression Narda Advisory Number 6". Miami, Florida: National Hurricane Center. Retrieved October 3, 2019.
  16. ^ Stacy R. Stewart (September 30, 2019). "Tropical Depression Narda Advisory Number 7". Miami, Florida: National Hurricane Center. Retrieved October 3, 2019.
  17. ^ Daniel P. Brown (September 30, 2019). "Tropical Storm Narda Advisory Number 9". Miami, Florida: National Hurricane Center. Retrieved October 3, 2019.
  18. ^ David Zelinsky (October 1, 2019). "Tropical Depression Narda Intermediate Advisory Number 12A". Miami, Florida: National Hurricane Center. Retrieved October 3, 2019.
  19. ^ ""Narda" deja segunda muerte por efectos en Oaxaca" (in Spanish). El Imparcial. September 30, 2019. Retrieved October 3, 2019.
  20. ^ "'Narda' deja tres muertos tras su paso por Oaxaca y Colima" (in Spanish). Noticieros Televisa. October 1, 2019. Retrieved October 1, 2019.
  21. ^ Sergio Ocampo Arista (October 1, 2019). "Tormenta tropical 'Narda' deja un muerto en Malinaltepec, Guerrero" (in Spanish). La Jornada. Retrieved October 1, 2019.
  22. ^ "Tras "Narda", suman 834 fincas afectadas en Jalisco" (in Spanish). Informador.mx. October 2, 2019. Retrieved October 3, 2019.
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