Hurricane Katia (2011)

Basin

North Atlantic

Dates

August 28, 2011 to September 12, 2011

Peak strength

Category 4, 120 kt (138 mph)

Lowest pressure

942 mb (27.82 inHg)

Landfall

Yes

Accumulated cyclone energy

27.0

Tropical-storm-force wind reached

270 nmi (500 km, 311 mi) from the center at its widest

Hurricane-force wind reached

80 nmi (148 km, 92 mi) from the center at its widest

Eyewall radius at its peak

30 nmi (56 km, 35 mi)

Overall size

340 nmi (630 km, 391 mi) to the outermost closed isobar

Peak gust in the best track

140 kt (161 mph)

Fastest the center moved

53 kt (61 mph)

Identifier

AL122011

The sources count different things and are not added together.

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

0

Property damage

$1.2 billion

Crop damage

none recorded

Events recorded

72 in 4 reports from 3 states and marine areas

State by state

What was recorded

45 flash flood, 22 flood, 3 high surf, 2 rip current.

From the Storm Events narratives, unedited.

A 40 year old male drown while attempting to rescue his children who were being pulled seaward by a strong rip current. The man was found floating in the water unconscious about a quarter mile away. Witnesses tried to perform CPR, and the man was taken to a local hospital, but didn't survive. The children were rescued by surfers.

Volusia, Florida · Rip Current · Sep 5, 20:15 UTC

Record flooding occurred along the Susquehanna River near Waverly, NY between September 7th and September 12th, 2011. The river crested at 26.67 feet at 4:15 PM on September 8th as determined by a USGS high water mark survey. This surpassed the previous record of 22.52 feet set during the June 2006 flood.

Tioga, New York · Flood · Sep 7, 17:26 UTC

A record flood occurred at the Binghamton/Washington St. bridge river gauge in Binghamton, NY. The crest was 25.71 feet at 3:00 PM on September 8, 2011. The flood waters topped the flood protection walls and levees, causing extensive flooding throughout the downtown areas of Binghamton. This surpassed the previous record of 25.0 feet set during the June 2006 flood.

Broome, New York · Flood · Sep 7, 19:23 UTC

Catastrophic flash flooding occurred in Bradford county. Routes 220 and 187 and numerous county roads were closed and severely damaged. Several towns were not accessible from the flash flooding. Students were unable to leave Northeast Bradford High School and evacuations took place in several communities.

Bradford, Pennsylvania · Flash Flood · Sep 7, 20:45 UTC

Record flooding occurred along the Susquehanna River throughout the Wyoming Valley of northeast Pennsylvania. The river crested at Wilkes-Barre at 42.66 feet around 7:00 AM on September 8, 2011 as determined by a USGS high water mark survey. The previous record crest was 40.91 feet which dates back to the June 1972 Hurricane Agnes flood.

Luzerne, Pennsylvania · Flood · Sep 8, 05:14 UTC

• Tropical Storm ArleneNorth Atlantic · 2011Tropical Storm55 kt · 993 mb
• Tropical Storm BretNorth Atlantic · 2011Tropical Storm60 kt · 995 mb
• Tropical Storm CindyNorth Atlantic · 2011Tropical Storm60 kt · 994 mb
• Tropical Storm DonNorth Atlantic · 2011Tropical Storm45 kt · 997 mb
• Tropical Storm EmilyNorth Atlantic · 2011Tropical Storm45 kt · 1003 mb
• Tropical Storm FranklinNorth Atlantic · 2011Tropical Storm40 kt · 1004 mb
• Tropical Storm GertNorth Atlantic · 2011Tropical Storm55 kt · 1000 mb
• Tropical Storm HarveyNorth Atlantic · 2011Tropical Storm55 kt · 994 mb
• Hurricane IreneNorth Atlantic · 2011 · 56 deathsCat 3105 kt · 942 mb
• Unnamed tropical depressionNorth Atlantic · 2011Tropical Depression30 kt · 1006 mb
• Tropical Storm JoseNorth Atlantic · 2011Tropical Storm40 kt · 1006 mb
• Unnamed tropical stormNorth Atlantic · 2011Tropical Storm40 kt · 1002 mb
• Tropical Storm LeeNorth Atlantic · 2011Tropical Storm50 kt · 986 mb
• Hurricane MariaNorth Atlantic · 2011Cat 170 kt · 983 mb
• Hurricane NateNorth Atlantic · 2011Cat 165 kt · 994 mb
• Hurricane OpheliaNorth Atlantic · 2011Cat 4120 kt · 940 mb
• Hurricane PhilippeNorth Atlantic · 2011Cat 180 kt · 976 mb
• Hurricane RinaNorth Atlantic · 2011Cat 3100 kt · 966 mb
• Tropical Storm SeanNorth Atlantic · 2011Tropical Storm55 kt · 982 mb

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.

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.

• Tropical cyclone report, National Hurricane Center
• Every advisory and discussion NHC issued while it was live
• Best track as KMZ, National Hurricane Center
• Wikipedia article: Hurricane Katia