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Hurricane Isaias tornado outbreak

As Hurricane Isaias moved up the East Coast of the United States, a damaging outbreak of 39 tornadoes impacted areas from South Carolina to Connecticut between August 3–4, 2020. The most significant tornado of the outbreak was a large and intense EF3 tornado that obliterated a mobile home park near Windsor, North Carolina, killing two and injuring 14. This was the strongest tornado in the United States to be spawned by a tropical cyclone since 2005. In the end, the outbreak killed two and injured 26.

Meteorological synopsis

Hurricane Isaias intensifying as it approached its final landfall in The Carolinas on August 3.

After weakening to a tropical storm southeast of Florida, Isaias quickly re-intensified to hurricane status as it approached its final landfall point of Ocean Isle Beach, North Carolina on August 3.[3] A cold front and upper-level trough that was influencing the storm's movement enhanced the shear profiles across the region and a slight risk for severe weather was issued by the Storm Prediction Center (SPC) in their 1300 UTC update for Northeastern South Carolina and Northeastern North Carolina. Numerous embedded low-topped supercells formed overnight, producing many tornadoes and causing widespread damage, primarily to the north and east of the center of Isaias.[4]

With the tornado outbreak already underway and likely to continue, the SPC issued an enhanced risk in their 1300 UTC update from the Northeastern Delmarva Peninsula to the Tri-State area on August 4, east of the forecast track where wind shear was maximized. Numerous tornadoes, a few of which were strong, continued to touch down throughout the morning before abruptly ceasing around midday after the storm moved into New England and transitioned into an extratropical cyclone. In the end, a total of 109 tornado warnings were issued by various National Weather Service offices across a swath of 12 states due to Hurricane Isaias.[5]

Confirmed tornadoes

August 3 event

August 4 event

See also

Notes

  1. ^ While the National Centers for Environmental Information lists 18 injuries for the Philadelphia tornado, the actual tornado count was estimated to have only been six, as reported in most sources
  2. ^ a b All dates are based on the local time zone where the tornado touched down; however, all times are in Coordinated Universal Time for consistency.

References

  1. ^ "August 3-4, 2020 tornadoes". National Centers for Environmental Information. National Weather Service. Retrieved 14 April 2021.
  2. ^ Storm Events Database, NOAA
  3. ^ "Hurricane ISAIAS Advisory Archive". www.nhc.noaa.gov. Retrieved 9 August 2020.
  4. ^ "SPC Severe Weather Event Review for Monday August 03, 2020". www.spc.noaa.gov. Retrieved 9 August 2020.
  5. ^ "SPC Severe Weather Event Review for Tuesday August 04, 2020". www.spc.noaa.gov. Retrieved 9 August 2020.
  6. ^ a b c d e f g h i j k l m n o p q r s t u v w x y z aa ab ac ad ae af ag ah ai aj "NWS Damage Assessment Toolkit". apps.dat.noaa.gov. Retrieved 9 August 2020.
  7. ^ North Carolina Event Report: EF2 Tornado. National Centers for Environmental Information (Report). National Weather Service. Retrieved 14 April 2021.
  8. ^ North Carolina Event Report: EF0 Tornado. National Centers for Environmental Information (Report). National Weather Service. Retrieved 14 April 2021.
  9. ^ North Carolina Event Report: EF0 Tornado. National Centers for Environmental Information (Report). National Weather Service. Retrieved 14 April 2021.
  10. ^ North Carolina Event Report: EF1 Tornado. National Centers for Environmental Information (Report). National Weather Service. Retrieved 14 April 2021.
  11. ^ South Carolina Event Report: EF0 Tornado. National Centers for Environmental Information (Report). National Weather Service. Retrieved 14 April 2021.
  12. ^ a b "NWS Wilmington NC Surveys 1". Twitter. Retrieved 10 August 2020.
  13. ^ NWS Damage Survey for 08/03/20 Tornado Event (Report). Iowa Environmental Mesonet. August 5, 2020. Retrieved August 6, 2020. {{cite report}}: Unknown parameter |agency= ignored (help)
  14. ^ NWS Damage Survey for 08/03/2020 Tornado Event (Report). Iowa Environmental Mesonet. August 4, 2020. Retrieved August 4, 2020. {{cite report}}: Unknown parameter |agency= ignored (help)
  15. ^ a b c d US Department of Commerce, NOAA. "Hurricane Isaias, August 4, 2020". www.weather.gov. Retrieved 8 August 2020.
  16. ^ NWS Damage Survey for Kennel Beach Tornado (Report). Iowa Environmental Mesonet. August 6, 2020. Retrieved August 7, 2020. {{cite report}}: Unknown parameter |agency= ignored (help)
  17. ^ NWS Damage Survey for Goose Creek State Park Tornado (Report). Iowa Environmental Mesonet. August 15, 2020. Retrieved August 15, 2020. {{cite report}}: Unknown parameter |agency= ignored (help)
  18. ^ NWS Damage Survey for Pinetown Tornado Event (Report). Iowa Environmental Mesonet. August 7, 2020. Retrieved August 7, 2020. {{cite report}}: Unknown parameter |agency= ignored (help)
  19. ^ NWS Damage Survey for Jamesville Tornado (Report). Iowa Environmental Mesonet. August 7, 2020. Retrieved August 7, 2020. {{cite report}}: Unknown parameter |agency= ignored (help)
  20. ^ a b c d e f g h i j k l m n o US Department of Commerce, NOAA. Summary of Tropical Storm Isaias. www.weather.gov (Report). Retrieved 8 August 2020.
  21. ^ NWS Damage Survey Confirms EF-3 Tornado in Bertie County NC (Report). Iowa Environmental Mesonet. August 5, 2020. Retrieved August 5, 2020. {{cite report}}: Unknown parameter |agency= ignored (help)
  22. ^ "NWS says fatal Bertie County tornado was an EF-3". WAVY.com. 5 August 2020. Retrieved 9 August 2020.
  23. ^ "North Carolina Event Report: EF3 Tornado". National Weather Service. National Centers for Environmental Information. Retrieved 3 December 2020.
  24. ^ NWS Damage Survey Confirms EF-0 Tornado in Murfreesboro NC (Report). Iowa Environmental Mesonet. August 5, 2020. Retrieved August 5, 2020. {{cite report}}: Unknown parameter |agency= ignored (help)
  25. ^ NWS Damage Survey for 8/4/2020 Tornado Event (Report). Iowa Environmental Mesonet. August 4, 2020. Retrieved August 4, 2020. {{cite report}}: Unknown parameter |agency= ignored (help)
  26. ^ EF2 tornado on Aug. 04, 2020 01:49 AM EDT, DailyRecord
  27. ^ a b NWS Damage Survey for 8/4/2020 Tornado Event (Report). Iowa Environmental Mesonet. August 4, 2020. Retrieved August 4, 2020. {{cite report}}: Unknown parameter |agency= ignored (help)
  28. ^ NWS Damage Survey for 8/4/2020 Tornado Event (Report). Iowa Environmental Mesonet. August 4, 2020. Retrieved August 4, 2020. {{cite report}}: Unknown parameter |agency= ignored (help)
  29. ^ NWS Damage Survey Confirms EF-1 Tornado in Gloucester County VA (Report). Iowa Environmental Mesonet. August 6, 2020. Retrieved August 6, 2020. {{cite report}}: Unknown parameter |agency= ignored (help)
  30. ^ NWS Damage Survey Confirms EF-2 Tornado in Lancaster and Northumberland Counties VA (Report). Iowa Environmental Mesonet. August 6, 2020. Retrieved August 6, 2020. {{cite report}}: Unknown parameter |agency= ignored (help)
  31. ^ EF2 tornado on Aug. 04, 2020 04:40 AM EDT, DailyRecord
  32. ^ NWS Damage Survey Confirms EF-2 Tornado in Wicomico County MD (Report). Iowa Environmental Mesonet. August 6, 2020. Retrieved August 6, 2020. {{cite report}}: Unknown parameter |agency= ignored (help)
  33. ^ NWS Damage Survey Confirms EF-1 Tornado in Northumberland County VA (Report). Iowa Environmental Mesonet. August 6, 2020. Retrieved August 6, 2020. {{cite report}}: Unknown parameter |agency= ignored (help)
  34. ^ a b c US Department of Commerce, NOAA. "Tropical Storm Isaias Tornadoes". www.weather.gov. Retrieved 8 August 2020.
  35. ^ EF-0 Tornado Confirmed near Scotland in St. Marys County Maryland (Report). Iowa Environmental Mesonet. August 6, 2020. Retrieved August 6, 2020. {{cite report}}: Unknown parameter |agency= ignored (help)
  36. ^ a b Preliminary Local Storm Report (Report). Iowa Environmental Mesonet. August 4, 2020. Retrieved August 4, 2020. {{cite report}}: Unknown parameter |agency= ignored (help)
  37. ^ NWS Damage Survey for 8/4/2020 Tornado from Tropical Storm Isaias (Report). Iowa Environmental Mesonet. August 25, 2020. Retrieved August 29, 2020. {{cite report}}: Unknown parameter |agency= ignored (help)
  38. ^ NWS Damage Survey for 08/04/2020 Tornado Event (Report). Iowa Environmental Mesonet. August 7, 2020. Retrieved August 7, 2020. {{cite report}}: Unknown parameter |agency= ignored (help)
  39. ^ Three tornadoes confirmed in Worcester County from Tropical Storm Isaias (Report). Iowa Environmental Mesonet. August 7, 2020. Retrieved August 7, 2020. {{cite report}}: Unknown parameter |agency= ignored (help)
  40. ^ a b c d e US Department of Commerce, NOAA. "Tropical Storm Isaias Widespread Damaging Winds and Flooding". www.weather.gov. Retrieved 8 August 2020.
  41. ^ a b c NWS Damage Assessment Results for Tropical Storm Isaias Tornadoes (Report). Iowa Environmental Mesonet. August 7, 2020. Retrieved August 7, 2020. {{cite report}}: Unknown parameter |agency= ignored (help)
  42. ^ a b c NWS Damage Assessment Results for Tropical Storm Isaias Tornadoes (Report). Iowa Environmental Mesonet. August 11, 2020. Retrieved August 11, 2020. {{cite report}}: Unknown parameter |agency= ignored (help)
  43. ^ Delaware Event Report: EF2 Tornado. National Centers for Environmental Information (Report). National Weather Service. Retrieved 14 April 2021.
  44. ^ Delaware Event Report: EF2 Tornado. National Centers for Environmental Information (Report). National Weather Service. Retrieved 14 April 2021.
  45. ^ Pennsylvania Event Report: EF2 Tornado. National Centers for Environmental Information (Report). National Weather Service. Retrieved 14 April 2021.
  46. ^ Pennsylvania Event Report: EF2 Tornado. National Centers for Environmental Information (Report). National Weather Service. Retrieved 14 April 2021.
  47. ^ Pennsylvania Event Report: EF2 Tornado. National Centers for Environmental Information (Report). National Weather Service. Retrieved 14 April 2021.
  48. ^ Service, NOAA's National Weather. "NWSChat - NOAA's National Weather Service". nwschat.weather.gov. Retrieved 8 August 2020.
  49. ^ Service, NOAA's National Weather. "NWSChat - NOAA's National Weather Service". nwschat.weather.gov. Retrieved 8 August 2020.
  50. ^ "Storm Prediction Center 20200804's Storm Reports". www.spc.noaa.gov. Retrieved 8 August 2020.
  51. ^ "NWS Eastern Region Tornado Stats". Twitter. Retrieved 8 August 2020.
  52. ^ @ryanhanrahan (7 August 2020). "This is the first tornado on record in Connecticut associated with a tropical storm or hurricane" (Tweet) – via Twitter.

External links