Hurricane Frances (2004)
Hurricane Frances reached Category 4 in the North Atlantic between August 25, 2004 and September 10, 2004, with a lowest pressure of 935 mb, and made landfall. It killed 2 people in the United States, by the National Weather Service’s record.
Track and intensity
The whole track of Hurricane Frances, colored by strength, with the other storms of the 2004 season in the same basin behind it, and its wind and pressure hour by hour. Every fix is in the track table below.
The storm
- Basin
- North Atlantic
- Dates
- August 25, 2004 to September 10, 2004
- Peak strength
- Category 4, 125 kt (144 mph)
- Lowest pressure
- 935 mb (27.61 inHg)
- Landfall
- Yes
- Accumulated cyclone energy
- 45.9
- Tropical-storm-force wind reached
- 175 nmi (324 km, 201 mi) from the center at its widest
- Hurricane-force wind reached
- 85 nmi (157 km, 98 mi) from the center at its widest
- Overall size
- 250 nmi (463 km, 288 mi) to the outermost closed isobar
- Peak gust in the best track
- 155 kt (178 mph)
- Fastest the center moved
- 29 kt (33 mph)
- Identifier
- AL062004
Deaths and damage
The sources count different things and are not added together.
NOAA Storm Events
2 deaths (2 direct, 0 indirect)$6.2 billion
What National Weather Service offices recorded county by county in 15 states and marine areas, in the United States only. Property and crop damage as each office estimated it, which is not a national loss total.
Landfalls
| Time (UTC) | Where | Position | Wind | Pressure |
|---|---|---|---|---|
| Sep 2, 19:30 | Coast unnamed here | 24.0N 74.5W | 110 kt (127 mph) | 948 mb |
| Sep 3, 05:30 | Coast unnamed here | 24.6N 75.6W | 100 kt (115 mph) | 954 mb |
| Sep 3, 10:00 | Coast unnamed here | 25.1N 76.1W | 95 kt (109 mph) | 956 mb |
| Sep 4, 10:00 | Lucaya, Freeport, Bahamas, 47 km away | 26.6N 78.2W | 90 kt (104 mph) | 961 mb |
| Sep 5, 04:30 | Sewall's Point, FL | 27.2N 80.2W | 90 kt (104 mph) | 960 mb |
| Sep 6, 18:00 | Woodville, FL, 34 km away | 30.1N 84.0W | 50 kt (58 mph) | 982 mb |
Landfall points the US agencies flagged in the best track. The nearest town is named from the site’s gazetteer, not from the report.
In the United States
NOAA’s Storm Events database, the record National Weather Service offices compile months after a storm, as compiled March 2026.
- Deaths
- 2 (2 direct, 0 indirect)
- Injuries
- 2
- Property damage
- $5.9 billion
- Crop damage
- $304 million
- Events recorded
- 546 in 78 reports from 15 states and marine areas
State by state
| State or marine area | Deaths | Injuries | Damage | Events |
|---|---|---|---|---|
| Florida | 1 | 0 | $6.1 billion | 92 |
| New York | 1 | 0 | $7.5 million | 30 |
| Georgia | 0 | 0 | $44 million | 261 |
| North Carolina | 0 | 0 | $29 million | 21 |
| Pennsylvania | 0 | 0 | $24 million | 28 |
| Ohio | 0 | 0 | $13 million | 28 |
| Maryland | 0 | 0 | $195,000 | 6 |
| West Virginia | 0 | 0 | $125,000 | 12 |
| Kentucky | 0 | 0 | $70,000 | 4 |
| South Carolina | 0 | 1 | $30,000 | 27 |
| Alabama | 0 | 1 | $26,000 | 14 |
| Virginia | 0 | 0 | 11 | |
| New Jersey | 0 | 0 | 9 | |
| Connecticut | 0 | 0 | 2 | |
| Delaware | 0 | 0 | 1 |
What was recorded
143 tropical storm, 119 flood, 76 high wind, 58 strong wind, 55 flash flood, 23 thunderstorm wind, 23 tornado, 16 hurricane (typhoon), 15 heavy rain, 10 storm surge/tide, 5 rip current, 3 debris flow.
Tornadoes and waterspouts
23 tornadoes recorded in the United States, strongest first.
| Rating | County | State | Time (UTC) | Path | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|---|
| F1 | Liberty | Georgia | Sep 6, 13:00 | 8.5 mi | 75 yd | ||
| F1 | Chatham | Georgia | Sep 6, 15:02 | 5.0 mi | 300 yd | ||
| F1 | Jasper | South Carolina | Sep 6, 18:55 | 2.0 mi | 100 yd | 1 | |
| F1 | Jasper | South Carolina | Sep 7, 11:35 | 4.0 mi | 75 yd | ||
| F1 | Allendale | South Carolina | Sep 7, 19:35 | 4.0 mi | 100 yd | ||
| F1 | Charles | Maryland | Sep 8, 16:58 | 5.0 mi | 150 yd | ||
| F0 | Osceola | Florida | Sep 4, 15:04 | 0.1 mi | 20 yd | ||
| F0 | Mcintosh | Georgia | Sep 6, 00:30 | 0.3 mi | 50 yd | ||
| F0 | Liberty | Georgia | Sep 6, 04:05 | 0.5 mi | 40 yd | ||
| F0 | Bryan | Georgia | Sep 6, 07:30 | 0.5 mi | 30 yd | ||
| F0 | Bulloch | Georgia | Sep 6, 08:20 | 3.0 mi | 60 yd | ||
| F0 | Candler | Georgia | Sep 6, 08:30 | 2.0 mi | 50 yd | ||
| F0 | Polk | Florida | Sep 6, 14:32 | 0.3 mi | 30 yd | ||
| F0 | Jasper | South Carolina | Sep 6, 15:17 | 1.0 mi | 100 yd | ||
| F0 | Colleton | South Carolina | Sep 6, 17:05 | 0.5 mi | 40 yd | ||
| F0 | Jasper | South Carolina | Sep 7, 07:30 | 0.5 mi | 50 yd | ||
| F0 | Dorchester | South Carolina | Sep 7, 07:55 | 0.5 mi | 40 yd | ||
| F0 | Allendale | South Carolina | Sep 7, 09:20 | 2.0 mi | 40 yd | ||
| F0 | Allendale | South Carolina | Sep 7, 09:40 | 1.0 mi | 40 yd | ||
| F0 | Hampton | South Carolina | Sep 7, 19:30 | 0.5 mi | 40 yd | ||
| F0 | Allendale | South Carolina | Sep 8, 01:05 | 0.5 mi | 40 yd | ||
| F0 | Allendale | South Carolina | Sep 8, 01:20 | 1.0 mi | 50 yd | ||
| F0 | Buckingham | Virginia | Sep 8, 20:30 | 0.8 mi | 33 yd |
Rainfall
The Weather Prediction Center attributes 3,937 rain gauge totals over the contiguous United States to this storm. The wettest reached 23.57 inches (599 mm).
| Station | Total | Position |
|---|---|---|
| MOUNT MITCHELL | 23.57 in (599 mm) | 35.75N 82.28W |
| LINVILLE FALLS-IFLOW NC | 18.07 in (459 mm) | 35.95N 81.90W |
| LAKE TOXAWAY 2 SW | 17.20 in (437 mm) | 35.12N 82.97W |
| CELO 2 S | 16.85 in (428 mm) | 35.83N 82.18W |
| Kent Grove | 16.61 in (422 mm) | 28.34N 82.52W |
| Beverly Hills | 16.13 in (410 mm) | 28.91N 82.45W |
| Chassahowitzka | 16.08 in (408 mm) | 28.72N 82.55W |
| JOCASSEE 8 WNW | 15.80 in (401 mm) | 34.98N 83.07W |
| WEST PALM BEACH INTL ARPT | 15.68 in (398 mm) | 26.68N 80.10W |
| Port Orange FL | 15.08 in (383 mm) | 29.11N 81.00W |
| Buccaneer Bay | 15.05 in (382 mm) | 28.52N 82.57W |
| Lecanto Gov't Complex | 15.00 in (381 mm) | 28.85N 82.49W |
WPC’s storm rainfall file, 1900 to 2020, compiled by David Roth.
Wind reports
The strongest winds National Weather Service offices recorded with this storm. An estimated figure is a forecaster’s judgment from the damage, not an instrument reading.
| Wind | How | Where | State | Time (UTC) |
|---|---|---|---|---|
| 61 kt (70 mph) | Measured | Seminole | Florida | Sep 5, 03:55 |
| 60 kt (69 mph) | Measured | Orange | Florida | Sep 5, 04:06 |
| 60 kt (69 mph) | Estimated | 2 SE of BURROUGHS | Georgia | Sep 6, 04:55 |
| 60 kt (69 mph) | Estimated | BETHESDA | Maryland | Sep 8, 18:45 |
| 55 kt (63 mph) | Estimated | 10 SW of WENTWORTH | North Carolina | Sep 8, 15:58 |
| 50 kt (58 mph) | Estimated | NORTH CHARLESTON | South Carolina | Sep 7, 15:15 |
| 50 kt (58 mph) | Estimated | ROCKY MT | Virginia | Sep 8, 15:23 |
| 50 kt (58 mph) | Estimated | Rabun | Georgia | Sep 7, 16:00 |
| 50 kt (58 mph) | Estimated | Avery | North Carolina | Sep 7, 16:00 |
| 50 kt (58 mph) | Estimated | 1 NW of ADAMS RUN | South Carolina | Sep 6, 16:55 |
| 50 kt (58 mph) | Estimated | EVINGTON | Virginia | Sep 8, 18:15 |
| 41 kt (47 mph) | Measured | Northern Erie | Pennsylvania | Sep 9, 07:00 |
What forecast offices wrote
From the Storm Events narratives, unedited.
From 10 to 12 inches of rain from the northern rainbands of Hurricane Frances produced widespread flooding of homes, businesses and roads across most of the coastal communities as well as in Deltona, and Deland.
Volusia, Florida · Flash Flood · Sep 5, 06:30 UTC
The Houston Home Journal of Perry reported that heavy rain, on the order of 4-8 inches during the evening and early morning hours, resulted in the collapse of the roof of the First Baptist Church of Perry. Two large gaping holes were left in the roof as a result of the weight of the water on the roof.
Houston, Georgia · Heavy Rain · Sep 7, 05:00 UTC
Remnants of Hurricane Frances moved northward near the Alabama and Georgia state line. Strong winds of 30 to 40 mph along with saturated ground conditions allowed several trees and power lines to be blown down.
Cherokee, Alabama · Strong Wind · Sep 7, 06:15 UTC
The Newnan Times/Herald reported that more than 6 inches of rain fell across the county during the early morning hours in association with Tropical Storm Frances. The heavy rain caused a large sinkhole to develop on East Washington Street. The road was closed as a result.
Coweta, Georgia · Heavy Rain · Sep 7, 07:00 UTC
An extended period of moderate to heavy rain associated with the remnants of Hurricane Frances led to gradual rises along creeks and streams, culminating in flooding across the county by late evening. In addition to smaller streams, the South Fork of the Catawba River and several of its tributaries exceeded flood stage. Several roads were flooded, as was a mobile home park near Kings Mountain. A large sinkhole in Kings Mountain forced the closure of another road.
Gaston, North Carolina · Flood · Sep 8, 03:00 UTC
Torrential rains resulted in flash flooding. Cars were trapped and people were rescued in Hoboken. Basements flooded with up to four feet of water across the county. A roadway overpass collapsed in Weehawken. In Harrison, 5 feet of water accumulated at Path train station. Rescues were performed by police there.
Hudson, New Jersey · Flash Flood · Sep 8, 12:15 UTC
Torrential rains caused countywide flash flooding. Several roads were closed, including parts of Routes 17 and 46. In Bogota, a SUV began floating when the vehicle was immersed in several feet of water. This resulted in rescues by local police.
Bergen, New Jersey · Flash Flood · Sep 8, 13:25 UTC
Torrential rains caused flash flooding throughout Rockland County. Basements flooded Tompkins Cove, and Stony Point. Several roads experienced closures, including Routes 59, 303, and Crooked hill Road. The Hackensack River also overflowed its banks onto Route 59, causing a small mouth bass to wash onto the highway.
Rockland, New York · Flash Flood · Sep 8, 16:30 UTC
A tornado touched down about 1 mile south of Garden Estates (about 6 miles sw of La Plata) on Biggs Farm Road. Several shelters and storage facilities were damaged or destroyed. Numerous trees, up to 2 feet in diameter, were either uprooted or topped. A large recreational van parked in front of a log-style home was overturned and at least 3 other automobiles were damaged from falling trees and debris. Then several homes sustained damage from felled trees, lost shingles, or suffered torn siding. A second touch down of the tornado brought damage to the Indian Head area, in west Charles County. 20 to 30 large trees, up to 3 feet in diameter, were uprooted. The total track length of the combined touchdowns was about 5 miles.
Charles, Maryland · Tornado · Sep 8, 16:58 UTC
Rain from remnants of Hurricane Frances began late on the 7th. It ended the morning of the 9th, but flooding continued for days. By 330 PM EDT, flooding was county-wide. By 615 PM EDT, just south of Cambridge, I-70 was closed by flooding; so were routes 265 and 513. Many roads remained flooded 4 PM on the 10th. By 8 PM EDT on 11th, flooding was primarily confined to the northern and central parts of Guernsey County. Most small stream flooding ended by 2 am EDT on the 12th, but flooding on Wills Creek in Cambridge continued. Wills Creek rose to flood stage (15 ft) at 9 PM EDT on the 8th; crested 24.9 at 5 AM EDT 10th; and fell below flood stage 11 PM EDT on the 14th. The crest fell short of the record (26.9 ft).Total rain: 6.6" at Salt Fork Sewage Plant. (FRANCES)
Guernsey, Ohio · Flood · Sep 8, 19:30 UTC
One to three inches of rain fell on Crawford County during the afternoon and evening hours. This rain was associated with the remnants of Tropical Storm Frances. Runoff from the rain caused lowland flooding to begin just after sunset. This flooding gradually worsened as the evening progressed. Reports of street and basement flooding were common.
Crawford, Pennsylvania · Flood · Sep 9, 00:04 UTC
The remnants of Hurricane Frances moved northeast across central Pennsylvania from late Thursday afternoon on September 8th, into the early morning hours of Friday, September 9th, producing widespread heavy rainfall, and subsequent minor to moderate flooding. Rainfall amounts of 3 to 5 inches within a 12 to 18 hour period led to numerous road closures and widespread basement flooding across central Pennsylvania, particularly in Blair and Huntingdon Counties. In Blair County, a railroad bridge in Hollidaysburg Borough was damaged by flood waters, while approximately 200 persons were evacuated due to flooded homes. In Huntingdon County, Juniata College evacuated 23 persons from a dormitory due to flooding, while in Logan Township, 35 calves were swept away by flood waters from a farm.
Warren, Pennsylvania · Flood · Sep 9, 01:45 UTC
Runoff from heavy rains produced by the remnants of Tropical Storm Frances caused the Mahoning River to go into flood. At Youngstown, the river went above the flood stage of 10 feet during the late evening hours of September 8th. The river crested at 14.35 feet during the evening of the 9th and fell below flood stage during the evening of the 10th. Extensive flooding occurred in low areas along the river. Several roads were damaged in Mill Creek Park. Buildings along the river in Youngstown also sustained some damage. Many roads along the river had to be closed because of the flooding.
Mahoning, Ohio · Flood · Sep 9, 08:00 UTC
Heavy rainfall from the remnants of hurricane Frances caused the Chemung River at Elmira to rise above its flood stage of 12 feet. The Chemung River at Elmira crested around 13 feet late on the 9th. Rainfall amounts were 1.5 to 4 inches with locally higher amounts across the Chemung River basin. Many roads were flooded and closed due to the river flooding in the Big Flats area.
Chemung, New York · Flood · Sep 9, 19:00 UTC
Track
| Time (UTC) | Position | Wind | Pressure | Status |
|---|---|---|---|---|
| Aug 25, 00:00 | 11.1N 35.2W | 25 kt | 1009 mb | Tropical depression |
| Aug 25, 06:00 | 11.2N 36.8W | 30 kt | 1008 mb | Tropical depression |
| Aug 25, 12:00 | 11.3N 38.3W | 30 kt | 1007 mb | Tropical depression |
| Aug 25, 18:00 | 11.5N 39.8W | 35 kt | 1005 mb | Tropical storm |
| Aug 26, 00:00 | 11.9N 41.5W | 40 kt | 1003 mb | Tropical storm |
| Aug 26, 06:00 | 12.3N 42.9W | 45 kt | 1000 mb | Tropical storm |
| Aug 26, 12:00 | 12.8N 44.5W | 55 kt | 994 mb | Tropical storm |
| Aug 26, 18:00 | 13.3N 45.8W | 65 kt | 987 mb | Hurricane |
| Aug 27, 00:00 | 13.7N 46.8W | 70 kt | 984 mb | Hurricane |
| Aug 27, 06:00 | 14.2N 47.8W | 75 kt | 980 mb | Hurricane |
| Aug 27, 12:00 | 14.7N 48.5W | 90 kt | 970 mb | Hurricane |
| Aug 27, 18:00 | 15.4N 49.3W | 100 kt | 962 mb | Hurricane |
| Aug 28, 00:00 | 15.9N 50.0W | 100 kt | 962 mb | Hurricane |
| Aug 28, 06:00 | 16.6N 50.9W | 100 kt | 962 mb | Hurricane |
| Aug 28, 12:00 | 17.2N 51.6W | 105 kt | 958 mb | Hurricane |
| Aug 28, 18:00 | 17.7N 52.3W | 115 kt | 948 mb | Hurricane |
| Aug 29, 00:00 | 18.1N 52.9W | 115 kt | 948 mb | Hurricane |
| Aug 29, 06:00 | 18.4N 53.6W | 115 kt | 948 mb | Hurricane |
| Aug 29, 12:00 | 18.6N 54.4W | 115 kt | 948 mb | Hurricane |
| Aug 29, 18:00 | 18.8N 55.0W | 110 kt | 948 mb | Hurricane |
| Aug 30, 00:00 | 18.9N 55.8W | 105 kt | 954 mb | Hurricane |
| Aug 30, 06:00 | 19.0N 56.8W | 100 kt | 958 mb | Hurricane |
| Aug 30, 12:00 | 19.2N 58.1W | 100 kt | 956 mb | Hurricane |
| Aug 30, 18:00 | 19.4N 59.3W | 110 kt | 948 mb | Hurricane |
| Aug 31, 00:00 | 19.6N 60.7W | 110 kt | 946 mb | Hurricane |
| Aug 31, 06:00 | 19.8N 62.1W | 115 kt | 950 mb | Hurricane |
| Aug 31, 12:00 | 20.0N 63.5W | 120 kt | 949 mb | Hurricane |
| Aug 31, 18:00 | 20.3N 65.0W | 125 kt | 942 mb | Hurricane |
| Sep 1, 00:00 | 20.6N 66.4W | 120 kt | 941 mb | Hurricane |
| Sep 1, 06:00 | 21.0N 67.9W | 120 kt | 939 mb | Hurricane |
| Sep 1, 12:00 | 21.4N 69.1W | 120 kt | 937 mb | Hurricane |
| Sep 1, 18:00 | 21.8N 70.4W | 120 kt | 941 mb | Hurricane |
| Sep 2, 00:00 | 22.2N 71.4W | 120 kt | 939 mb | Hurricane |
| Sep 2, 06:00 | 22.7N 72.5W | 125 kt | 937 mb | Hurricane |
| Sep 2, 12:00 | 23.2N 73.5W | 120 kt | 939 mb | Hurricane |
| Sep 2, 18:00 | 23.8N 74.3W | 115 kt | 948 mb | Hurricane |
| Sep 2, 19:30 landfall | 24.0N 74.5W | 110 kt | 948 mb | Hurricane |
| Sep 3, 00:00 | 24.2N 75.0W | 105 kt | 948 mb | Hurricane |
| Sep 3, 05:30 landfall | 24.6N 75.6W | 100 kt | 954 mb | Hurricane |
| Sep 3, 06:00 | 24.7N 75.7W | 100 kt | 954 mb | Hurricane |
| Sep 3, 10:00 landfall | 25.1N 76.1W | 95 kt | 956 mb | Hurricane |
| Sep 3, 12:00 | 25.3N 76.3W | 95 kt | 958 mb | Hurricane |
| Sep 3, 18:00 | 25.7N 77.1W | 90 kt | 960 mb | Hurricane |
| Sep 4, 00:00 | 26.0N 77.5W | 85 kt | 960 mb | Hurricane |
| Sep 4, 06:00 | 26.4N 77.9W | 85 kt | 960 mb | Hurricane |
| Sep 4, 10:00 landfall | 26.6N 78.2W | 90 kt | 961 mb | Hurricane |
| Sep 4, 12:00 | 26.8N 78.5W | 90 kt | 962 mb | Hurricane |
| Sep 4, 18:00 | 26.8N 79.1W | 90 kt | 962 mb | Hurricane |
| Sep 5, 00:00 | 27.0N 79.4W | 95 kt | 958 mb | Hurricane |
| Sep 5, 04:30 landfall | 27.2N 80.2W | 90 kt | 960 mb | Hurricane |
| Sep 5, 06:00 | 27.2N 80.2W | 90 kt | 960 mb | Hurricane |
| Sep 5, 12:00 | 27.4N 80.7W | 80 kt | 969 mb | Hurricane |
| Sep 5, 18:00 | 27.8N 81.7W | 60 kt | 975 mb | Tropical storm |
| Sep 6, 00:00 | 28.1N 82.3W | 55 kt | 978 mb | Tropical storm |
| Sep 6, 06:00 | 28.6N 83.3W | 55 kt | 981 mb | Tropical storm |
| Sep 6, 12:00 | 29.2N 83.7W | 55 kt | 982 mb | Tropical storm |
| Sep 6, 18:00 landfall | 30.1N 84.0W | 50 kt | 982 mb | Tropical storm |
| Sep 7, 00:00 | 31.0N 84.6W | 35 kt | 984 mb | Tropical storm |
| Sep 7, 06:00 | 31.5N 85.0W | 30 kt | 988 mb | Tropical depression |
| Sep 7, 12:00 | 32.0N 85.2W | 25 kt | 992 mb | Tropical depression |
| Sep 7, 18:00 | 32.5N 85.1W | 25 kt | 996 mb | Tropical depression |
| Sep 8, 00:00 | 33.4N 84.7W | 25 kt | 998 mb | Tropical depression |
| Sep 8, 06:00 | 34.3N 84.3W | 25 kt | 1000 mb | Tropical depression |
| Sep 8, 12:00 | 36.1N 83.2W | 25 kt | 1001 mb | Tropical depression |
| Sep 8, 18:00 | 37.8N 82.1W | 25 kt | 1002 mb | Tropical depression |
| Sep 9, 00:00 | 38.7N 81.3W | 25 kt | 1001 mb | Extratropical |
| Sep 9, 06:00 | 40.5N 80.0W | 30 kt | 1001 mb | Extratropical |
| Sep 9, 12:00 | 42.8N 77.7W | 35 kt | 1001 mb | Extratropical |
| Sep 9, 18:00 | 44.3N 75.7W | 30 kt | 1002 mb | Extratropical |
| Sep 10, 00:00 | 45.3N 73.3W | 25 kt | 1003 mb | Extratropical |
| Sep 10, 06:00 | 46.2N 70.5W | 20 kt | 1004 mb | Extratropical |
| Sep 10, 12:00 | 46.6N 67.3W | 20 kt | 1005 mb | Extratropical |
| Sep 10, 18:00 | 47.2N 64.2W | 20 kt | 1005 mb | Extratropical |
Other North Atlantic storms of 2004
- Hurricane AlexNorth Atlantic · 2004
- Tropical Storm BonnieNorth Atlantic · 2004
- Hurricane CharleyNorth Atlantic · 2004
- Hurricane DanielleNorth Atlantic · 2004
- Tropical Storm EarlNorth Atlantic · 2004
- Hurricane GastonNorth Atlantic · 2004
- Tropical Storm HermineNorth Atlantic · 2004
- Hurricane IvanNorth Atlantic · 2004
- Unnamed tropical depressionNorth Atlantic · 2004
- Hurricane JeanneNorth Atlantic · 2004
- Hurricane KarlNorth Atlantic · 2004
- Hurricane LisaNorth Atlantic · 2004
- Tropical Storm MatthewNorth Atlantic · 2004
- Tropical Storm NicoleNorth Atlantic · 2004
- Tropical Storm OttoNorth Atlantic · 2004
What this means
A best track is the record a warning agency settles on after the storm, not what it said at the time: position, maximum sustained wind and central pressure every six hours, revised against every observation that came in later. Category is the Saffir-Simpson scale, which runs from Category 1 at 64 kt to Category 5 at 137 kt and reads wind only, so it says nothing about surge or rain. Accumulated cyclone energy adds up the square of the wind through the storm's life, so it counts strength and duration together.
Sources
Storm history from NOAA NCEI’s International Best Track Archive for Climate Stewardship (IBTrACS), which merges the official best track of every warning agency. Live storms, cones, watches and warnings from the National Hurricane Center and the Central Pacific Hurricane Center. Archived radar from NOAA’s Level II archive.