Re: Harvey, Irma, Maria and Nate retired by the World Meteorological Organization
Posted by Chris in Tampa on 4/12/2018, 10:39 pm
| I was trying to figure out which country or countries asked that it be retired. I believe that is how it works. I couldn't figure it out. The rain did a lot of damage. NHC Tropical Cyclone Report (PDF): https://www.nhc.noaa.gov/data/tcr/AL162017_Nate.pdf "The combination of Nate and the large gyre caused widespread rains over portions of Central America from 3-7 October. Costa Rica was particularly hard hit, with numerous totals over 10 inches (254 mm) and a maximum total of 19.19 inches (487.3 mm) at Maritima. Elsewhere in Central America, rainfall totals were generally 4-7 inches (100-175 mm). In Cuba, the cyclone produced generally light rains, with the maximum reported amount being 4.04 inches (112 mm) at San Juan y Martinez. Rains of 4-5 inches also occurred in the Cayman Islands." The widespread heavy rains over Central America produced widespread flooding and mudslides, and media reports indicate that these caused 44 deaths in the region: 16 in Nicaragua, 13 in Costa Rica, 6 in Panama, 5 in Guatemala, 3 in Honduras, and 1 in El Salvador. An additional death in Panama was due to a "shipwreck", bringing the death toll directly associated with Nate to 45. An additional 9 people were missing in the region. No deaths were directly associated with Nate in the United States. However, there were two fatalities indirectly related to the storm due to traffic accidents." I was trying to figure it out on the WMO site: https://public.wmo.int/en/media/news/wmo-hurricane-committee-reviews-devastating-2017-season-retires-names "Hurricane Nate crossed northeastern Nicaragua and eastern Honduras as a tropical storm, then made landfall on the northern Gulf Coast as a category 1 hurricane. It brought rainfall that caused significant impacts in Central America, where media reports indicate that these caused 44 deaths in the region. An additional fatality in Panama was due to a "shipwreck," bringing the death toll directly associated with Nate to 45. An additional nine people were missing in the region." http://www.wmo.int/pages/prog/www/tcp/HC-40.html "The country suffered huge economic losses. Total losses for various sectors of the economy and society are estimated at approximately US$ 562 million." From the "Report from Costa Rica" document on that page. Microsoft Word 2007 document: http://www.wmo.int/pages/prog/www/tcp/linkedfiles/RA-IV-HC-40-d03-2.10_COSTA-RICA_en.docx Or I created a PDF that can be downloaded here. Here is where it became a tropical cyclone, a tropical depression, "about 35 n mi south of San Andres Island":  Here is what the NHC's report said about it: "Nate had a complex origin that involved several different weather systems. A large area of low pressure in the eastern Pacific Intertropical Convergence Zone and over Central America (a Central American gyre; Papin et al., 2017) gradually developed in early October. As this occurred, a tropical wave moved through the eastern Caribbean Sea, and the southern end of the wave interacted with the gyre. The northern end of the wave amplified into a sharp trough as it interacted with a large mid- to upper-level low pressure area over the eastern and central Gulf of Mexico. This pattern produced multiple small low pressure areas and vorticity centers. One low pressure area in the eastern North Pacific would become Tropical Storm Ramon on 4 October. Another vorticity center, associated with the northern part of the tropical wave, moved westward across Florida into the Gulf of Mexico on 4-5 October. A third vorticity center, over the southwestern Caribbean Sea, caused an area of convection to form on 2 October. Scatterometer data indicated that this system developed a closed wind circulation on 3 October, and by 1200 UTC 4 October it had a sufficiently well-defined circulation and enough organized convection to be considered a tropical depression about 35 n mi south of San Andres Island. The "best track" chart of the tropical cyclone's path is given in Fig. 1, with the wind and pressure histories shown in Figs. 2 and 3, respectively. The best track positions and intensities are listed in Table 11." There is something of note from the NHC and posted on the WMO site. This:  From the first WMO page I posted and also a link from the second WMO page posted within another Word 2007 document, "SUMMARY of the PAST SEASON" by RSMC Miami (NHC): http://www.wmo.int/pages/prog/www/tcp/linkedfiles/HC-40_Doc-3.1_RSMCMiami.docx Or view the PDF here. It doesn't seem the deaths are associated directly with Nate as a tropical cyclone ("Deaths during the tropical cyclone phase"), but "during other portions of the cyclone's life cycle". The NHC says later in the report, "bringing the death toll directly associated with Nate to 45". A bit of a disparity. Some of the countries where there were deaths were hit by Nate as a tropical cyclone. The NHC lsays "The widespread heavy rains over Central America produced widespread flooding and mudslides, and media reports indicate that these caused 44 deaths in the region". In the US the NHC notes "No deaths were directly associated with Nate in the United States. However, there were two fatalities indirectly related to the storm due to traffic accidents." I am a little confused by how a death can be directly related to Nate, but not be during the tropical cyclone phase. The NHC starts off by saying "Nate had a complex origin that involved several different weather systems." In addition to Costa Rica, other countries also saw deaths, so perhaps given that the combined death toll and damage, some of which was when it was a tropical cyclone, are why it got retired. I don't have a satellite loop of it at that time. Here is a radar image at about the time of the Nicaraguan landfall from the NHC's report:  Here is a satellite image posted at Wikipedia while over Nicaragua:  It did seem to be rather broad, pulling moisture across Central America when it was a tropical cyclone. I could see it being hard to see what was only from Nate and what might not have been. I wish I had a satellite loop of it. More info from Wikipedia: https://en.wikipedia.org/wiki/Hurricane_Nate Although I did just find this archive of imagery: http://inventory.ssec.wisc.edu/inventory/ Imagery list for that day. (some of the later imagery on that page is actually from the next day and the search interface doesn't seem to work well sometimes) Where you can get imagery at about the time it became a tropical depression, around 12Z on October 4th (imagery from Oct 4th, 12:15Z or 12:30Z):     Here is imagery about 12 hours after becoming a tropical depression (Oct 5th, 00:15Z):  About 18 hours after becoming a tropical depression (Oct 5th, 06:15Z), when it became a tropical storm (Oct 5th, 6Z):  And about 24-25 hours after becoming a tropical depression (Oct 5th, 12:45Z), about 6-7 hours after it became a tropical storm:  |
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Harvey, Irma, Maria and Nate retired by the World Meteorological Organization - Chris in Tampa, 4/12/2018, 4:24 pm
- Re: Harvey, Irma, Maria and Nate retired by the World Meteorological Organization - jimw, 4/12/2018, 6:27 pm
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