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.
 Map of tornadoes and tornado warnings associated with Isaias in the U.S. | |
| Type | Tornado outbreak |
|---|---|
| Duration | August 3–4, 2020 |
| Highest winds |
|
| Tornadoes confirmed | 39[1] |
| Max. rating1 | EF3 tornado |
| Fatalities | 2 fatalities, 26 injuries[note 1] |
| Damage | >$18.9 million (2020 USD)[2] |
| Areas affected | East Coast of the United States |
Part of the tornado outbreaks of 2020 1Most severe tornado damage; see Enhanced Fujita scale | |
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
| EFU | EF0 | EF1 | EF2 | EF3 | EF4 | EF5 | Total |
|---|---|---|---|---|---|---|---|
| 0 | 11 | 20 | 7 | 1 | 0 | 0 | 39 |
August 3 event
| EF# | Location | County / Parish | State | Start Coord. | Time (UTC) | Path length | Max width | Summary |
|---|---|---|---|---|---|---|---|---|
| EF2 | Bald Head Island to Southport | Brunswick | NC | 33.8465°N 77.9592°W | 23:55–00:05 | 8.3 mi (13.4 km) | 80 yd (73 m) | A strong waterspout moved onshore in Bald Head Island. There, homes lost roofing and had windows blown in, and a swath of large trees was flattened. It crossed the Cape Fear River, before coming onshore again in Southport. Homes and businesses were damaged, and trees were snapped or uprooted in that area before the tornado dissipated.[6][7] |
| EF0 | SW of Bolivia | Brunswick | NC | 34.0403°N 78.1409°W | 00:15-00:19 | 2.91 mi (4.68 km) | 20 yd (18 m) | Trees and tree limbs were downed along the path.[8][9][6] |
| EF1 | NW of Supply | Brunswick | NC | 34.1162°N 78.3191°W | 00:15–00:16 | 0.28 mi (0.45 km) | 25 yd (23 m) | Trees were damaged, including 20 pine trees which were snapped. The path may been longer, but the area was inaccessible due to a lack of road access in the Green Swamp.[10][6] |
| EF0 | Garden City Beach | Georgetown | SC | 33.568°N 79.0046°W | 00:20–00:21 | 0.2 mi (0.32 km) | 30 yd (27 m) | A waterspout came onshore, causing minor damage to a few homes before quickly lifting. One injury occurred at a beach home.[11][6] |
| EF1 | S of Leland to W of Navessa | Brunswick | NC | 34.2268°N 78.0124°W | 00:43–00:46 | 2.59 mi (4.17 km) | 30 yd (27 m) | Trees were snapped, including several pine trees.[12][13][6] |
| EF1 | Leland | Brunswick | NC | 34.2064°N 77.9810°W | 01:59–02:01 | 1.5 mi (2.4 km) | 40 yd (37 m) | This tornado moved through a subdivision in Leland, where roofs and chimneys were damaged, and a garage door partially collapsed. Many trees were snapped or uprooted along the path, including several pine trees which were 2 ft (0.61 m) in diameter.[12][14][6] |
| EF1 | Kennel Beach to SE of Fairfield Harbor | Pamlico | NC | 35.0238°N 76.8986°W | 03:23–03:25 | 2.35 mi (3.78 km) | 40 yd (37 m) | This tornado originated as a waterspout over the Neuse River. Once it came onshore in Kennel Beach, it snapped trees, including one pine tree which fell on a home. It continued to damage trees before lifting in a rural area.[15][16][6] |
August 4 event
| EF# | Location | County / Parish | State | Start Coord. | Time (UTC) | Path length | Max width | Summary |
|---|---|---|---|---|---|---|---|---|
| EF1 | Goose Creek State Park | Beaufort | NC | 35.4610°N 76.8952°W | 04:18–04:19 | 0.15 mi (0.24 km) | 70 yd (64 m) | This tornado touched down on the southeast side of the state park. A swath of large pine trees were snapped.[17][6] |
| EF1 | NE of Pinetown | Beaufort | NC | 35.6441°N 76.8008°W | 04:48–04:49 | 0.1 mi (0.16 km) | 50 yd (46 m) | Several large hardwood trees were uprooted and large limbs were snapped by this brief tornado. Corn was damaged in a farm field as well.[15][18][6] |
| EF1 | Bayview | Beaufort | NC | 35.4262°N 76.7291°W | 04:50–04:51 | 0.8 mi (1.3 km) | 180 yd (160 m) | Numerous trees, the majority of which were pine, were either snapped, uprooted, or twisted. Several of the trees fell on vehicles and homes in town, causing roof and wall damage. A manufactured home sustained minor damage, and the roof of a small shed was blown off.[15][6] |
| EF1 | SSW of Jamesville | Martin | NC | 35.7803°N 76.9094°W | 05:02–05:03 | 0.2 mi (0.32 km) | 40 yd (37 m) | A large oak tree fell on a mobile home. Additional trees and crops were damaged nearby.[15][19][6] |
| EF3 | SSW of Woodard to NW of Windsor | Bertie | NC | 35.8873°N 76.8904°W | 05:15–05:26 | 10 mi (16 km) | 600 yd (550 m) | 2 deaths – This intense and destructive tornado first touched down southwest of Woodard just north of the Roanoke River, and rapidly intensified as it moved northwest and crossed Knowles Lane. As it reached Middle Track Road, the tornado reached its peak intensity, completely destroying three mobile homes, a barn, and a single-story frame home at EF3 strength. The frame home was completely leveled but was not anchored to its foundation. The tornado maintained its strength while reaching its peak width as it struck a mobile home park along Morning Road. A dozen mobile homes were destroyed, and several others were severely damaged. Some of the mobile homes were obliterated, with their metal frames twisted and the debris scattered long distances through a nearby field. Several vehicles were tossed in this area as well. The two fatalities occurred at the mobile home park. The tornado then continued northwestward and weakened slightly to EF2 intensity, flattening a large swath of trees and causing significant damage to some homes in neighborhoods along or just off of Woodward Road. The tornado weakened further to EF1 strength as it damaged multiple businesses and homes along the concurrent US 17/Bypass US 17 and US 13 just west of Windsor. Several farm buildings were damaged northwest of Windsor before the tornado dissipated along NC 308. A total of 14 people were injured.[20][21][6] This was strongest tornado spawned by a tropical cyclone since 2005. After the storm, North Carolina Governor Roy Cooper, toured the mobile home park hit by the tornado in Windsor, saying it was "devastating" to see what happened to the area.[22][23] |
| EF0 | E of Menola to SW of Murfreesboro | Hertford, Northampton | NC | 36.4052°N 77.1567°W | 06:13–06:19 | 5 mi (8.0 km) | 100 yd (91 m) | Mainly tree damage occurred, although the large TDS produced by the tornado prompted a PDS tornado warning.[20][24][6] |
| EF0 | NE of Como, NC to E of Statesville, VA | Hertford (NC), Southampton (VA) | NC, VA | 36.5238°N 76.9581°W | 06:37–06:41 | 3.13 mi (5.04 km) | 50 yd (46 m) | A weak tornado snapped limbs and downed a few trees to the northeast of Mill Neck, North Carolina.[20][6] |
| EF2 | WSW of Franklin to N of Courtland | Southampton | VA | 36.6450°N 76.9900°W | 06:49–07:19 | 15.9 mi (25.6 km) | 200 yd (180 m) | Numerous homes and businesses were damaged along US 58 near Courtland, including a hotel, which sustained total roof loss and collapse of multiple second-story exterior walls. Multiple industrial buildings and a gas station were severely damaged as well. Many trees were snapped or uprooted, and several vehicles were overturned.[20][25] Overall, this tornado caused $12 million in damages.[26] |
| EF1 | NW of Lynchs Corner, NC to NNW of Suffolk, VA | Pasquotank (NC), Camden (NC), City of Suffolk (VA) | NC, VA | 36.4675°N 76.4573°W | 07:02–07:30 | 26.86 mi (43.23 km) | 150 yd (140 m) | This tornado moved through rural areas of the Great Dismal Swamp before striking Downtown Suffolk. Eight buildings were significantly damaged in the downtown area, including a multi-story brick building that sustained collapse of an exterior wall. Homes were also damaged in residential areas, a few of which had sections of roofing torn off. Many trees were uprooted or snapped along the path as well, some of which landed on structures.[20][27][6] |
| EF0 | W of Great Dismal Swamp to ESE of Windsor | City of Suffolk | VA | 36.657°N 76.562°W | 07:08–07:22 | 11.7 mi (18.8 km) | 100 yd (91 m) | This tornado hit the western side of Suffolk right before the EF1 tornado hit downtown. Damage was limited to trees being uprooted or snapped.[20][27][6] |
| EF1 | NW of Jamestown | James City | VA | 37.24°N 76.86°W | 08:13–08:14 | 0.8 mi (1.3 km) | 200 yd (180 m) | This brief tornado originated as a waterspout. After coming onshore, shingles were ripped off roofs, a garage door was caved in, and a brick gable collapsed. The tornado passed over a golf course before lifting. Trees and tree limbs were snapped.[20][28][6] |
| EF1 | SSE of Rosewell to ENE of Capahosic | Gloucester | VA | 37.3264°N 76.5862°W | 08:53–09:00 | 4.7 mi (7.6 km) | 250 yd (230 m) | This tornado originated as a waterspout over the York River before moving ashore. Numerous trees were snapped or uprooted, and several homes sustained roof and siding damage. The tornado briefly crossed the York River again before lifting.[20][29][6] |
| EF2 | ENE of Palmer to N of Browns Corner | Lancaster, Northumberland | VA | 37.6274°N 76.3358°W | 09:40–10:00 | 15.6 mi (25.1 km) | 500 yd (460 m) | A strong tornado produced high-end EF2 damage in the rural community of Antipoison Neck, where multiple homes sustained significant roof and exterior wall damage. The tornado weakened as it struck the eastern part of Kilmarnock, causing damage to roofs, siding, and trees. The tornado continued to cause roof and tree damage as it moved to the north before dissipating. Five people were injured.[30][20] The tornado caused $3 million in damages.[31][6] |
| EF2 | W of Mardela Springs | Wicomico | MD | 38.4474°N 75.7575°W | 09:55–10:00 | 1.3 mi (2.1 km) | 100 yd (91 m) | Several homes were damaged just outside of town, including one that was pushed off its foundation and heavily damaged. Sheds and outbuildings were destroyed, and trees were snapped or uprooted, including a few that sustained some low-end debarking. An automotive repair business sustained minor damage to its overhead doors at the end of the path.[20][32][6] |
| EF1 | Fleeton to W of Reedville | Northumberland | VA | 37.8137°N 76.2771°W | 10:06–10:09 | 2.2 mi (3.5 km) | 100 yd (91 m) | This tornado originated as a waterspout over the Chesapeake Bay, before moving onshore in Fleeton. Several homes had roof and siding damage, a garage was destroyed, and trees were snapped or uprooted. The tornado destroyed a canopy before lifting.[20][33][6] |
| EF0 | Scotland to Ridge | St. Mary's | MD | 38.093°N 76.365°W | 10:27–10:31 | 1.5 mi (2.4 km) | 75 yd (69 m) | Many trees were snapped or downed along the path.[34][35][6] |
| EF1 | W of Piney Point to Callaway | St. Mary's | MD | 38.174°N 76.528°W | 10:32–10:41 | 5.3 mi (8.5 km) | 100 yd (91 m) | Numerous trees were snapped or uprooted, some of which fell on and damaged homes and a shed. A camper was also blown over.[34][36][6] |
| EF1 | Solomons | Calvert | MD | 38.3336°N 76.4782°W | 10:52–10:53 | 0.9 mi (1.4 km) | 175 yd (160 m) | Trees were snapped or uprooted, including some which fell on recreational vehicles, as well as onto several recreational facilities at a U.S. Navy compound.[37][6] |
| EF2 | George Island Landing to Girdletree | Worcester | MD | 38.0969°N 75.3813°W | 11:14–11:17 | 3.79 mi (6.10 km) | 200 yd (180 m) | A low-end EF2 tornado destroyed some chicken houses shortly after touching down. A camper and a number of outbuildings were overturned and tossed, and several homes on the edge of the path had partial roof loss and blown out windows. The tornado weakened after that, causing minor tree damage on the east side of Girdletree before dissipating.[20][6] |
| EF0 | Quantico | Wicomico | MD | 38.3290°N 75.7318°W | 11:22–11:26 | 2.74 mi (4.41 km) | 100 yd (91 m) | This tornado developed over the Wicomico River. It tracked through a residential neighborhood, causing minor damage to several homes. Siding, shingles, and gutters were damaged, and trees were uprooted.[20][38][6] |
| EF1 | N of Dares Beach | Calvert | MD | 38.6150°N 76.5120°W | 11:33–11:37 | 1.7 mi (2.7 km) | 100 yd (91 m) | A waterspout moved onshore at Plum Point, downing many trees and several power lines. Three houses sustained damage from fallen trees, and a fourth house had windows blown out.[34][36][6] |
| EF0 | NE of Ironshire to WNW of Showell | Worcester | MD | 38.4067°N 75.2465°W | 11:35–11:44 | 7.99 mi (12.86 km) | 75 yd (69 m) | This tornado crossed US 113 before snapping and uprooting trees in and around Berlin.[20][39][6] |
| EF0 | S of Snug Harbor to Ocean Pines | Worcester | MD | 38.4013°N 75.1758°W | 11:55–12:05 | 9.91 mi (15.95 km) | 75 yd (69 m) | An intermittent tornado occurred just east of the previous one, downing several trees, one of which landed on a home.[20][6] |
| EF0 | Queenstown | Queen Anne's | MD | 38.93°N 76.13°W | 12:18-12:19 | 0.6 mi (0.97 km) | 35 yd (32 m) | A narrow path of crop damage occurred in a corn field. Some minor tree damage occurred as well.[40][41][6] |
| EF1 | Sandtown | Kent | DE | 39.01°N 75.69°W | 12:25-12:28 | 2.6 mi (4.2 km) | 200 yd (180 m) | One home had some windows blown out, another had its roof blown off, while several other homes in Sandtown sustained less severe roof damage. One large garage lost its back sheet metal wall as well.[40][41][6] |
| EF1 | Freeman Corner to WNW of Milford | Sussex, Kent | DE | 38.89°N 75.45°W | 12:25-12:30 | 2.7 mi (4.3 km) | 400 yd (370 m) | Many trees were snapped or uprooted, some of which fell on homes. Power poles and lines were downed.[42][6] |
| EF2 | Dover to SW of Glasgow | Kent, New Castle | DE | 39.10°N 75.50°W | 12:55–13:30 | 35.78 mi (57.58 km) | 500 yd (460 m) | As this tornado touched down on the southern side of Dover, it did significant damage to trees, some of which fell on homes. The tornado crossed US 13, where it blew off sections of roofing at a middle school. A nearby warehouse had metal walls torn off, and some tractor trailers were blown onto their sides. A garage was also severely damaged. Damage along this first segment of the path was rated EF1. Past Dover, the tornado produced intermittent tree damage before impacting the east side of Smyrna, where more significant tree damage occurred. A weather station run by DelDOT measured a 96 mph (154 km/h) wind gust on DE 1 north of Smyrna as the tornado passed by. The tornado destroyed a car repair facility on the south end of Smyrna and damaged numerous houses. The tornado then nearly paralleled US 13 and DE 1 through the eastern side of Townsend at high-end EF1 strength, causing considerable damage to homes and businesses. Numerous trees were snapped or uprooted, and a garage was also destroyed. The most intense damage in Townsend occurred within the vicinity of Blackbird Landing Road and Gum Bush Road. The tornado then reached low-end EF2 intensity as it struck Middletown, where many homes near Spring Hollow Drive sustained significant roof, exterior wall, and garage door damage. A few of these homes sustained at least partial exterior wall loss, including one poorly constructed home that had an entire second-floor exterior wall ripped off. Low-end EF2 damage continued near Summit Bridge as multiple additional homes sustained considerable damage to the north of Middletown, one of which had half of its roof torn of. Many trees were snapped, and several other homes lost portions of their roofs in this area. Farther along the path, the tornado maintained low-end EF2 intensity as it tracked near Lums Pond and through portions of Bear, where more homes were damaged, and trees were downed. The most significant damage along this segment of the path occurred as the tornado crossed DE 896 and into the Brennan Estates subdivision, where 12 homes were damaged to the point where they were declared uninhabitable. The tornado then rapidly weakened and finally lifted to the southwest of Glasgow, just prior to crossing into Cecil County, Maryland. This was the longest tracked tornado in the state since modern records began in 1950.[43][44] |
| EF1 | Strathmere to Marmora | Cape May | NJ | 39.19°N 74.66°W | 13:45–13:50 | 5.25 mi (8.45 km) | 150 yd (140 m) | This tornado originated as a waterspout, before coming onshore on the south end of Corson's Inlet State Park near Strathmere. The tornado then crossed Garden State Parkway and tracked along US 9 through the southern side of Marmora. Homes and businesses were significantly damaged, including some which lost their roofs, and some which had significant damage done to their side or corner walls. One home was shifted off its foundation. Near a Coca-Cola facility, the tornado tossed containers and flipped a tractor trailer. A large shed was upended and vehicles were pushed. Trees were snapped or uprooted, including some which fell on cars, crushing them.[40][42][6] |
| EF0 | Worcester Township | Montgomery | PA | 40.16°N 75.33°W | 14:44–14:50 | 2.8 mi (4.5 km) | 200 yd (180 m) | Some small trees were downed, tree tops were snapped off, and several utility poles were pushed over.[40][42][6] |
| EF1 | Ship Bottom to NNW of Mud City | Ocean | NJ | 39.63°N 74.20°W | 14:50–14:54 | 3 mi (4.8 km) | — | A waterspout first developed over Manahawkin Bay between Ship Bottom and Brant Beach. It crossed the Route 72 bridge over the bay, before coming onshore near Mud City in mainly marshy areas. Other than some light debris seen flying over the bay bridge, no damage was found. However, a weather station located north of Egg Island measured a wind gust of 109 mph (175 km/h) at 10:53 AM EDT (14:53 UTC). This measurement was used to rate this tornado high-end EF1 as no meaningful damage was found.[40][41][6] |
| EF2 | Northeast Philadelphia to NW of Doylestown | Bucks, Philadelphia | PA | 40.0815°N 74.9592°W | 14:50–15:10 | 20.77 mi (33.43 km) | 500 yd (460 m) | This intermittent, but strong tornado first touched down just east of the Philadelphia Mills shopping mall in Northeast Philadelphia, and moved northwest at EF1 strength. At a former Walmart building undergoing reconstruction, three exhaust systems and six RTU systems were blown off the roof. Roofing, siding and awnings were blown off many homes in the area, and some cars were either tossed or flipped. Trees were snapped or uprooted, including some which were over 100 years old. The tornado then lifted before briefly touching down in Southampton at a slightly weaker low-end EF1 intensity. Numerous trees and tree limbs were snapped, including some that damaged homes and cars. After lifting again, the tornado touched down a third time at its peak intensity of low-end EF2 in Doylestown. Bleachers on the visitors' side of an athletic field at Central Bucks High School West were tossed before the tornado hit the Doylestown Hospital complex, tossing numerous vehicles in a parking lot. Some of these vehicles were piled atop one another, and six were thrown considerable distances. The tornado then struck the Children's Village Day Care center, causing significant damage as large portions of roof structure were torn from the building. Debris from this location was strewn through a nearby field. Numerous large trees were snapped or uprooted in Doylestown, and several metal light posts were bent to the ground. The tornado weakened back to EF1 intensity as it continued northwest, damaging homes and other properties, and snapping or uprooting trees. The tornado then lifted for the final time along Ferry Road near Lake Galena in Peace Valley Park. There were six minor injuries.[45][46][47] |
| EF1 | Saugatuck Shores | Fairfield | CT | 41.10°N 73.38°W | 17:40–17:41 | 50 yd (46 m) | 25 yd (23 m) | A waterspout over the Long Island Sound moved onshore before quickly dissipating. A house had its roof blown off and several pine trees were snapped. This was the first tornado on record in Connecticut to be associated with a tropical storm or hurricane.[48][49][50][51][52][6] |
See also
Notes
- 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
- All dates are based on the local time zone where the tornado touched down; however, all times are in Coordinated Universal Time for consistency.
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- @ryanhanrahan (7 August 2020). "This is the first tornado on record in Connecticut associated with a tropical storm or hurricane" (Tweet) – via Twitter.
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