Tropical Storm Arthur (2020) Explained

Tropical Storm Arthur
Extratropical:May 19
Winds:50
Pressure:990
Year:2020
Fatalities:None
Damage:112000
Areas:Cuba, South Florida, The Bahamas, North Carolina, Mid-Atlantic United States, Bermuda
Season:2020 Atlantic hurricane season

Tropical Storm Arthur was a strong off-season tropical cyclone that impacted the East Coast of the United States in May 2020. The first of thirty-one depressions and thirty different named storms of the extremely active 2020 Atlantic hurricane season, Arthur marked the record sixth consecutive year in the Atlantic basin with a tropical cyclone forming before June. It was one of two off-season storms in the season, alongside short-lived Tropical Storm Bertha. Arthur originated from a front that stalled over the Straits of Florida on May 10, which slowly drifted south for two days. The system became a tropical depression on May 16 north of The Bahamas. A day later, the system intensified into a tropical storm and was named Arthur. Arthur gradually intensified while tracking towards the Outer Banks of North Carolina, attaining its peak intensity with maximum 1-minute sustained winds of 60mph and a minimum central pressure of 990mbar on May 19, before skirting the region and becoming an extratropical cyclone. The cyclone then accelerated towards Bermuda and dissipated on May 21.

Arthur caused choppy seas and rip currents to much of the East Coast. In its formative stages, the storm brought severe weather, including hail and high winds, to southern Florida. In the state, heavy rain caused the ceiling of a house to collapse on a boy, injuring him. Tropical cyclone warnings and watches were issued for North Carolina, where Arthur brought heavy rain and tropical storm-force wind gusts to the coastline. Elsewhere, the storm caused gusty winds. No fatalities were reported from the storm, and according to the National Centers for Environmental Information, damage totaled $112,000 (2020 USD).

Meteorological history

Arthur's origins can be traced to a front that stalled over the Straits of Florida on May 10.[1] On May 12, the National Hurricane Center (NHC) first discussed the possibility of subtropical development north of the Bahamas in relation with the front.[2] Scattered convection, or thunderstorms, began to increase in association with an upper-level trough that moved into the Gulf of Mexico on May 14.[1] [3] Over the next day, the low moved north-northeastward, steered around a subtropical ridge to its east, and passed just east of the southeastern Florida coast. The center was located over the warm waters of the Gulf Stream.[1] Convection began to slowly build around the center by early May 16, and Doppler weather radar showed a well-defined low-level circulation (LLC) had formed displaced just slightly east of the main thunderstorms.[1] [4] Based on this, the NHC upgraded the low to Tropical Depression One at 18:00 UTC on May 16 while located about 125miles east of Melbourne, Florida.[1] The system was considered tropical instead of subtropical in nature due to persisting central deep convection and a tight radius of maximum winds.[5]

Based on reports from a Hurricane Hunter aircraft of tropical-storm force winds, the NHC upgraded the system to Tropical Storm Arthur at 00:00 UTC on May 17.[6] Being steered generally north-northeast for the next several hours, Arthur stayed well offshore of the coasts of Florida and Georgia.[7] However, a mid-level trough centered over the United States caused Arthur to slowly be pushed northeastwards over a section of relatively cool waters and as a result most of the storm's convection became limited to the east of the circulation.[8] Despite a lopsided structure, reconnaissance aircraft found Arthur slightly stronger, despite its appearance on satellite.[9] Deep convection began to swiftly re-develop over the center as the storm began to move over warmer waters of the Gulf Stream, resulting in strengthening.[10] [11] Wind shear increased as Arthur neared North Carolina, which began separating the storm's convection from the LLC. The storm passed a mere 20miles southeast from Cape Hatteras early on May 18.[12] By that time, the storm was interacting with a frontal boundary, which triggered extratropical transition.[1] At 00:00 UTC on May 19, Arthur obtained its minimum central pressure of 990mb and its peak intensity of 60mph.[1] Six hours later, the storm completed its transition to an extratropical cyclone as a trailing warm front developed behind the now almost fully exposed LLC.[13] The extratropical storm turned southeast on May 20 as the trough Arthur was interacting with passed the cyclone to the north. Arthur then tracked south towards Bermuda and dissipated early on May 21.[1]

Preparations and impact

Caribbean and Bermuda

The precursor to Arthur dropped heavy rainfall in Granma Province in Cuba on May 15, including 78mm of rainfall in Bayamo in only four hours. These rains resulted in indunated streets and flood damage to homes.[14] In the Bahamas, squalls occurred on Grand Bahama island, where many were still recovering from the adverse effects of Hurricane Dorian, which devastated the country in September 2019.[1] Gusty winds damaged tents and other temporary shelters across the island, and heavy rainfall caused some minimal flooding.[15] However, since the strongest winds of the disturbance were located to the east of the center, damage was limited.[16]

The extratropical remnants of Arthur brought gale-force winds to Bermuda. A sustained wind of 45mph was recorded at a weather observation site on Pearl Island, Bermuda. In addition, a gust of 63mph was recorded at the same spot.[1]

United States

Florida

Arthur caused dangerous water conditions at beaches as it passed east of Florida. Rip currents led to the water rescues of 70 people in Volusia County, 3 of whom were hospitalized.[17] In addition, rainbands from the precursor disturbance to Arthur caused heavy rain and severe thunderstorms in South Florida. Over 4inches of rain fell in many sections of the Middle Keys and a peak rainfall total of 5.35inches fell in Marathon on May 14, where it was the tenth highest rainfall amount for the city on record and second most for May.[18] [19] Flash flood warnings were issued for large portions of Miami-Dade County on May 14, where street flooding was reported.[20] Tropical storm-force wind gusts as well as waterspouts prompted the issuance of gale warnings and special marine warnings across the majority of South Florida.[21] In St. Petersburg, a large tree was uprooted by strong winds from a squall line.[22] Lightning from Arthur's rainbands caused a house fire in North Naples. No one was injured, and estimated damage was at $50,000.[23] A trained weather spotter reported nickel-sized hail in Wellington.[24] In the same town, a storm chaser reported a funnel cloud.[25] Gale-force wind gusts were recorded in Coconut Grove, causing a large tree to fall onto a house.[26] In Hollywood, heavy rain caused a ceiling to collapse on a 5-year-old boy and another family member. The boy was struck on the head by debris and took to the hospital.[27] In Davie, a patio roof collapsed, destroying furniture. In the same town, a man was in critical condition after being electrocuted while fixing an electronic appliance in the rain.[28] Damage across Florida reached $112,000.[29]

North Carolina

On May 16, tropical storm watches were issued from Surf City to Duck and Pamlico Sound to Albemarle Sound.[30] A day later, these watches were upgraded to tropical storm warnings as Arthur moved closer towards the Outer Banks.[31] In anticipation of inclement weather conditions associated with Tropical Storm Arthur, Dare County Public Works suspended residential and commercial trash collection in Colington Island, Kitty Hawk, Buxton, Frisco, and Hatteras. Commercial collection was also suspended for Manteo, Wanchese, Manns Harbor, Stumpy Point, Rodanthe, Waves, Salvo, and Avon.[32] By late May 17, rough surf conditions were already being experienced on the southern portion of the Outer Banks.[33] Torrential rainfall occurred as Arthur's outer rainbands scraped eastern North Carolina,[34] with 4.92inches of rain falling in Newport within 6 hours, and many other locations recording at least 3inches of rain from the storm.[35] Tropical storm-force wind gusts in Cape Hatteras were also recorded, although the lopsided nature of the storm kept the strongest winds offshore.[36] The only tropical-storm force 1-minute sustained winds was at Alligator River Bridge in Tyrrell County.[1] Wave heights as high as 12.5feet were recorded from buoys along the coast of the Outer Banks from Arthur.[37] Due to flooding from Arthur, many highways in the Outer Banks and into mainland North Carolina were closed.[33] SpaceX was also forced to delay the launch of several Starlink internet satellites due to adverse weather from Arthur affecting the recovery fleet.[38] As Arthur moved away from the coast, tropical storm warnings were lifted as conditions gradually improved later in the evening.[39]

Elsewhere

Purple and red flags were raised along the coasts of Georgia and South Carolina to alert the public for rip currents.[40] Offshore Georgia, 3– waves were reported.[41] In James City County, Virginia, moderate coastal flooding was reported in some places.[42] In southern New Jersey, Post-Tropical Cyclone Arthur, along with a large upper-level low to its west, caused coastal flooding and strong winds in towns on the Jersey Shore. Power lines were reported down in several towns. Trees were blown down on the Atlantic City Expressway and on U.S. Route 30 in Mullica Township.[43]

See also

External links

Notes and References

  1. Tropical Cyclone Report: TROPICAL STORM ARTHUR 16-19 May 2020. National Hurricane Center. Latto. Andy. September 10, 2020 . September 18, 2020. September 19, 2020 . https://web.archive.org/web/20200919023437/https://www.nhc.noaa.gov/data/tcr/AL012020_Arthur.pdf . live.
  2. Special Tropical Weather Outlook 1005 AM EDT Tue May 12 2020 . Cangialost. John. National Hurricane Center . May 17, 2020 . September 19, 2020 . https://web.archive.org/web/20200919023438/https://www.nhc.noaa.gov/archive/xgtwo/gtwo_archive.php?current_issuance=202005121407&basin=atl&fdays=2 . live .
  3. Special Tropical Weather Outlook 725 PM EDT Wed May 13 2020 . National Hurricane Center . May 17, 2020 . July 2, 2020 . https://web.archive.org/web/20200702231552/https://www.nhc.noaa.gov/archive/xgtwo/gtwo_archive.php?current_issuance=202005132325&basin=atl&fdays=2 . live .
  4. NHC Graphical Outlook Archive. National Hurricane Center. 2020-05-17. September 19, 2020. https://web.archive.org/web/20200919023444/https://www.nhc.noaa.gov/archive/xgtwo/gtwo_archive.php?current_issuance=202005161212&basin=atl&fdays=5. live.
  5. Tropical Depression One Discussion Number 1. Cangialosi. John. May 16, 2020. National Hurricane Center. live. https://web.archive.org/web/20200604021617/https://www.nhc.noaa.gov/archive/2020/al01/al012020.discus.001.shtml. June 4, 2020. May 17, 2020.
  6. Tropical Storm Arthur Discussion Number 2. Stewart. Stacy. May 17, 2020. National Hurricane Center. live. https://web.archive.org/web/20200603224617/https://www.nhc.noaa.gov/archive/2020/al01/al012020.discus.002.shtml. June 3, 2020. May 17, 2020.
  7. Tropical Storm Arthur Intermediate Advisory Number 2A. Pasch. Richard. May 17, 2020. National Hurricane Center. live. https://web.archive.org/web/20200603055135/https://www.nhc.noaa.gov/archive/2020/al01/al012020.public_a.002.shtml. June 3, 2020. May 17, 2020.
  8. Web site: Tropical Storm Arthur Discussion Number 3. Pasch. Richard. May 17, 2020. National Hurricane Center. live. https://web.archive.org/web/20200604152103/https://www.nhc.noaa.gov/archive/2020/al01/al012020.discus.003.shtml. June 4, 2020. May 17, 2020.
  9. Web site: Tropical Storm Arthur Discussion Number 4. Brown. Daniel. May 17, 2020. National Hurricane Center. live. https://web.archive.org/web/20200607044538/https://www.nhc.noaa.gov/archive/2020/al01/al012020.discus.004.shtml. June 7, 2020. May 18, 2020.
  10. Tropical Storm Arthur Discussion Number 8. Brown. Daniel. May 18, 2020. National Hurricane Center. live. https://web.archive.org/web/20200604171457/https://www.nhc.noaa.gov/archive/2020/al01/al012020.discus.008.shtml. June 4, 2020. May 18, 2020.
  11. Tropical Storm Arthur Advisory Number 10. Brown. Daniel. May 18, 2020. National Hurricane Center. live. https://web.archive.org/web/20200604133638/https://www.nhc.noaa.gov/archive/2020/al01/al012020.public.008.shtml. June 4, 2020. May 18, 2020.
  12. Tropical Storm Arthur Advisory Number 8. Stewart. Stacy. May 18, 2020. National Hurricane Center. live. https://web.archive.org/web/20200605043053/https://www.nhc.noaa.gov/archive/2020/al01/al012020.public.010.shtml. June 5, 2020. May 29, 2020.
  13. Blake . Eric . Post-Tropical Cyclone Arthur Discussion Number 12 . National Hurricane Center . May 29, 2020 . June 4, 2020 . https://web.archive.org/web/20200604164649/https://www.nhc.noaa.gov/archive/2020/al01/al012020.discus.012.shtml . live .
  14. News: Lluvias intensas provocan inundaciones en Bayamo. ADN Cuba. es. 2020-05-18. May 20, 2020. https://web.archive.org/web/20200520172949/https://adncuba.com/noticias-de-cuba/actualidad/lluvias-intensas-provocan-inundaciones-en-bayamo. live.
  15. News: Tropical Weather Conditions Expected to Hit Grand Bahama. Tribune242. en. 2020-05-18. May 22, 2020. https://web.archive.org/web/20200522015111/http://www.tribune242.com/news/2020/may/15/tropical-weather-conditions-expected-to-hit-grand/. live.
  16. News: Messy System Near South Florida Still Forecast to Organize. Norcross. Bryan. 2020-05-15. WPLG. en. 2020-05-18. May 21, 2020. https://web.archive.org/web/20200521205027/https://www.local10.com/weather/2020/05/15/messy-system-near-south-florida-still-forecast-to-organize/. live.
  17. Web site: This Year's First Atlantic Storm Arthur Will Bring High Surf, Strong Winds and Heavy Rains to the North Carolina Coast. www.wrcbtv.com. en. 2020-05-18. May 23, 2020. https://web.archive.org/web/20200523181642/https://www.wrcbtv.com/story/42140100/this-years-first-atlantic-storm-arthur-will-bring-high-surf-strong-winds-and-heavy-rains-to-the-north-carolina-coast. live.
  18. News: First Depression or Storm of 2020 Atlantic Hurricane Season, Possibly Arthur, To Form Off Southeast Coast This Weekend. The Weather Channel. live. May 16, 2020. https://web.archive.org/web/20200516151519/https://weather.com/storms/hurricane/news/2020-05-14-first-storm-2020-hurricane-season-arthur-possible.
  19. Web site: The rainfall record in #MarathonFL was crushed today! As of 6 pm, 5.35" had been recorded, which is over 4" more than the previous record of 1.20" set in 1988! It's also the 2nd wettest day in May and the 10th wettest day ever. #flwx #FloridaKeys #KeyWest #RecordRainfall #weatherpic.twitter.com/SosQ92zOpm. 2020-05-14. @NWSKeyWest. en. live. https://web.archive.org/web/20200919023454/https://twitter.com/NWSKeyWest/status/1261059206402109440/photo/1. September 19, 2020. 2020-05-18.
  20. Web site: Arthur, the First Named Storm of the Hurricane Season, Could Form Saturday. Allison . Chinchar . CNN. May 15, 2020 . 2020-05-18. May 18, 2020. https://web.archive.org/web/20200518085632/https://www.cnn.com/2020/05/15/weather/tropical-storm-arthur-forecast-weekend-friday/index.html. live.
  21. Web site: Flood and wind advisories issued for South Florida, and the storms could spawn tornadoes. Cohen. Howard. The Miami Herald. live. https://web.archive.org/web/20200919023506/https://www.miamiherald.com/news/weather-news/article242757876.html. September 19, 2020. May 18, 2020.
  22. Event: Thunderstorm wind in Pinellas County, Florida. May 18, 2020. National Centers for Environmental Information. November 19, 2020.
  23. Event:Lightning in Collier County, Florida. May 18, 2020. National Centers for Environmental Information. November 18, 2020.
  24. Event: Hail in Palm Beach County, Florida. May 17, 2020. National Centers for Environmental Information. November 18, 2020.
  25. Event: Funnel Cloud in Palm Beach County, Florida. May 17, 2020. National Centers for Environmental Information. November 18, 2020.
  26. Event: Thunderstorm Wind in Miami-Dade County, Florida. May 17, 2020. National Centers for Environmental Information. November 19, 2020.
  27. Event: Heavy Rain in Broward County, Florida. May 18, 2020. National Centers for Environmental Information. November 18, 2020.
  28. News: Roof Collapses, Man Electrocuted During Day of Bad Storms in South Florida. NBC 6 South Florida. May 19, 2020. Lewis. Derrick. November 19, 2020.
  29. Web site: National Centers for Environmental Information. 2020. August 22, 2020. [Florida Event Reports for May 14–18, 2020]]. September 13, 2020. https://web.archive.org/web/20200913033436/https://www.ncdc.noaa.gov/stormevents/listevents.jsp?eventType=ALL&beginDate_mm=05&beginDate_dd=14&beginDate_yyyy=2020&endDate_mm=05&endDate_dd=18&endDate_yyyy=2020&county=ALL&hailfilter=0.00&tornfilter=0&windfilter=000&sort=DT&submitbutton=Search&statefips=12%2CFLORIDA. live.
  30. Web site: Tropical Depression One Advisory Number 1. Cangialosi. John. May 16, 2020. live. https://web.archive.org/web/20200604214511/https://www.nhc.noaa.gov/archive/2020/al01/al012020.public.001.shtml. June 4, 2020. November 19, 2020.
  31. Web site: Tropical Storm Arthur Advisory Number 3. Pasch. Richard. May 17, 2020. live. https://web.archive.org/web/20200605034750/https://www.nhc.noaa.gov/archive/2020/al01/al012020.public.003.shtml. June 5, 2020. November 19, 2020.
  32. News: Dare suspends residential and commercial trash collection due to Tropical Storm Arthur. May 17, 2020. The Coastland Times. May 18, 2020.
  33. News: Tropical Storm Arthur Hits North Carolina Coast with Rain. Drew. Jonathan. May 18, 2020. The Associated Press. November 19, 2020.
  34. News: Cappucci. Matthew. 2020-05-18. Tropical Storm Arthur Lashes Outer Banks with Heavy Rain, High Surf. en-US. Washington Post. 2020-05-18. 0190-8286. May 25, 2020. https://web.archive.org/web/20200525173430/https://www.washingtonpost.com/weather/2020/05/18/tropical-storm-arthur-lashes-outer-banks-with-heavy-rain-high-surf/. live.
  35. Public Information Statement: PRECIPITATION REPORTS 1055 AM EDT Mon May 18 2020. National Weather Service. live. https://web.archive.org/web/20200426155133/https://forecast.weather.gov/product.php?site=NWS&issuedby=MHX&product=PNS&format=CI&version=3&glossary=0. April 26, 2020. November 19, 2020.
  36. Web site: Public Information Statement: HIGHEST WIND REPORTS 237 PM EDT Mon May 18 2020. National Weather Service. live. https://web.archive.org/web/20160314213851/http://forecast.weather.gov/product.php?site=NWS&issuedby=MHX&product=PNS&format=CI&version=1&glossary=0. March 14, 2016.
  37. News: Tropical Storm Arthur flirts with landfall over NC Outer Banks . May 18, 2020 . AccuWeather. May 18, 2020 . September 19, 2020 . https://web.archive.org/web/20200919023450/https://www.accuweather.com/en/hurricane/tropical-storm-arthur-makes-close-approach-to-north-carolina/741838 . live .
  38. News: SpaceX Postpones Starlink Satellite Fleet Launch due to Tropical Storm Arthur. May 2020. Chelsea. Gohd . Space.com. en. 2020-05-18. May 20, 2020. https://web.archive.org/web/20200520035546/https://www.space.com/spacex-starlink-launch-delayed-by-tropical-storm-arthur.html. live.
  39. News: Price. Mark. Aldridge. Bailey. May 18, 2020. Tropical Storm Warning Lifted as Arthur Moves Away from North Carolina's Outer Banks. The News & Observer. live. November 19, 2020. September 19, 2020. https://web.archive.org/web/20200919023458/https://www.newsobserver.com/news/state/north-carolina/article242796541.html.
  40. News: Tropical Storm Arthur Churning Off Georgia Coast. 2020-05-18. en-US. 2020-05-18. September 19, 2020. https://web.archive.org/web/20200919023440/https://atlanta.cbslocal.com/2020/05/18/tropical-storm-arthur-churning-off-georgia-coast/. live. CBS.
  41. News: Wetter Weather returns this week!. 2020-05-18. June 1, 2020. https://web.archive.org/web/20200601134107/https://www.wtoc.com/2020/05/17/wetter-weather-returns-this-week/. live. WTOC.
  42. Event: Coastal Flood in James City County, Virginia. May 19, 2020. National Centers for Environmental Information. November 23, 2020.
  43. News: Wind Damage Happening in South Jersey, Coastal Concerns Remain. The Press of Atlantic City. May 19, 2020. Martucci. Joe. November 19, 2020.

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