Current Tropics Activity

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Atlantic Cyclone Activity
Quick Glance At The TropicsQuick Glance At The Tropics
Saffir-Simpson Hurricane Scale
CategoryWind SpeedStorm Surge
 mphft
5≥157>18
4130–15613–18
3111–1299–12
296–1106–8
174–954–5
Additional Classifications
Tropical Storm39–730–3
Tropical Depression0–380
The Saffir-Simpson Hurricane Scale is a classification used for most Western Hemisphere tropical cyclones that exceed the intensities of "tropical depressions" and "tropical storms", and thereby become hurricanes. Source: Intellicast

Beaufort Wind Scale

Number Of Storms Per 100 Yrs

00Z Runs of TC Genesis Probability Ensemble-based Probability (%) of TC Genesis Consensus (NCEP, CMC and ECMWF) 0-48 Hours 0-120 Hours 120-240 Hours Ensemble-based Probability (%) of TC Genesis Consensus (NCEP) 0-48 Hours 0-120 Hours 120-240 Hours 12Z Runs of TC Genesis Probability Ensemble-based Probability (%) of TC Genesis Consensus (NCEP, CMC and ECMWF) 0-48 Hours 0-120 Hours 120-240 Hours Ensemble-based Probability (%) of TC Genesis Consensus (NCEP) 0-48 Hours 0-120 Hours 120-240 Hours

Atlantic Basin Storm Count Since 1850


Atlantic Basin Storm Count Since 1850

Hurricane Strike Percentages

[Map of return period in years for hurricanes passing within 50 nautical miles]
Estimated return period in years for hurricanes passing within 50 nautical miles of various locations on the U.S. Coast
[Map of return period in years for major hurricanes passing within 50 nautical miles]
Estimated return period in years for MAJOR passing within 50 nautical miles of various locations on the U.S. Coast

CONUS Hurricane Strikes

1950-2017
[Map of 1950-2017 CONUS Hurricane Strikes]
Total Hurricane Strikes 1900-2010 Total Hurricane Strikes 1900-2010 Total MAJOR Hurricane Strikes 1900-2010 Total Major Hurricane Strikes 1900-2010Western Gulf Hurricane Strikes Western Gulf Hurricane Strikes Western Gulf MAJOR Hurricane Strikes Western Gulf Major Hurricane StrikesEastern Gulf Hurricane Strikes Eastern Gulf Hurricane Strikes Eastern Gulf MAJOR Hurricane Strikes Eastern Gulf Major Hurricane StrikesSE Coast Hurricane Strikes SE Coast Hurricane Strikes SE Coast MAJOR Hurricane Strikes SE Coast Major Hurricane StrikesNE Coast Hurricane Strikes NE Coast Hurricane Strikes NE Coast MAJOR Hurricane Strikes NE Coast Major Hurricane Strikes

Lookup Historic Hurricane Tracks

Hurricane Katrina Track 2005

Typical Tropical Cyclone Origins and Tracks by Month

June
June Hurricane Climatology July
July Hurricane Climatology August
August Hurricane Climatology September
September Hurricane Climatology October
October Hurricane Climatology November
November Hurricane Climatology

Hurricane Season Statistics

Overview

A tropical cyclone is a rotating, organized system of clouds and thunderstorms that originates over tropical or subtropical waters and has a closed low-level circulation. Tropical cyclones rotate counterclockwise in the Northern Hemisphere. They are classified as follows:

  • Tropical Depression: A tropical cyclone with maximum sustained winds of 38 mph (33 knots) or less.
  • Tropical Storm: A tropical cyclone with maximum sustained winds of 39 to 73 mph (34 to 63 knots).
  • Hurricane: A tropical cyclone with maximum sustained winds of 74 mph (64 knots) or higher. In the western North Pacific, hurricanes are called typhoons; similar storms in the Indian Ocean and South Pacific Ocean are called cyclones.
  • Major Hurricane: A tropical cyclone with maximum sustained winds of 111 mph (96 knots) or higher, corresponding to a Category 3, 4 or 5 on the Saffir-Simpson Hurricane Wind Scale.

The Atlantic hurricane season runs from June 1st to November 30th. The Atlantic basin includes the Atlantic Ocean, Caribbean Sea, and Gulf of Mexico.

[graph of average cumulative number of Atlantic basin systems per year]

The average cumulative number of Atlantic systems per year, 1966-2009

Number of Tropical Cyclones per 100 Years

 

Peak Of Season

The official hurricane season for the Atlantic Basin (the Atlantic Ocean, the Caribbean Sea, and the Gulf of Mexico) is from 1 June to 30 November. As seen in the graph above, the peak of the season is from mid-August to late October. However, deadly hurricanes can occur anytime in the hurricane season.

Points of Origin by 10-Day Period

The figures below show the points of tropical cyclone genesis by 10-day periods during the hurricane season. These figures depict named storms only; no subtropical storms or unnamed storms. The source years include 1851-2009 for the Atlantic and 1949-2009 for the Eastern Pacific from the HURDAT database.

Tropical Cyclone Genesis Climatology

Tropical Cyclone Genesis Climatology

Tropical Cyclone Genesis Climatology

Tropical Cyclone Genesis Climatology

Tropical Cyclone Genesis Climatology

Tropical Cyclone Genesis Climatology

Tropical Cyclone Genesis Climatology

Tropical Cyclone Genesis Climatology

Tropical Cyclone Genesis Climatology

Tropical Cyclone Genesis Climatology

Tropical Cyclone Genesis Climatology

Tropical Cyclone Genesis Climatology

Tropical Cyclone Genesis Climatology

Tropical Cyclone Genesis Climatology

Tropical Cyclone Genesis Climatology

Tropical Cyclone Genesis Climatology

Tropical Cyclone Genesis Climatology

Tropical Cyclone Genesis Climatology

Tropical Cyclone Genesis Climatology

Tropical Cyclone Genesis Climatology

Tropical Cyclone Genesis Climatology

Climatological Areas of Origin and Typical Hurricane Tracks by Month

The figures below show the zones of origin and tracks for different months during the hurricane season. These figures only depict average conditions. Hurricanes can originate in different locations and travel much different paths from the average. Nonetheless, having a sense of the general pattern can give you a better picture of the average hurricane season for your area.

 

June Hurricane Climatology

July Hurricane Climatology

August Hurricane Climatology

September Hurricane Climatology

October Hurricane Climatology

November Hurricane Climatology

 

High Resolution History Maps

 


[Tropical Cyclone History Map for Atlantic and Eastern Pacific]

All North Atlantic and Eastern North Pacific tropical cyclones


[Hurricane History Map for Atlantic and Eastern Pacific]

All North Atlantic and Eastern North Pacific hurricanes

(at least Category 1 on the Saffir-Simpson Hurricane Scale)


[Major Hurricane History Map for Atlantic and Eastern Pacific]

All North Atlantic and Eastern North Pacific major hurricanes

(at least Category 3 on the Saffir-Simpson Hurricane Scale)

Named Cyclones by Year

 


[Graph of Tropical Cyclone Activity in the Atlantic Basin]

Bars depict number of named systems (open/yellow),

hurricanes (hatched/green), and category 3 or greater (solid/red), 1886-2004

Download hires image

Hurricane Return Periods

Hurricane return periods are the frequency at which a certain intensity of hurricane can be expected within a given distance of a given location (for the below images 50 nm or 58 statute miles). In simpler terms, a return period of 20 years for a major hurricane means that on average during the previous 100 years, a Category 3 or greater hurricane passed within 50 nm (58 miles) of that location about five times. We would then expect, on average, an additional five Category 3 or greater hurricanes within that radius over the next 100 years.

More information on return periods can be found from NOAA Technical Memorandum NWS NHC 38 (pdf) on the NHC Risk Analysis Program (HURISK).

Note: The information on return period is generated with the 1987 HURISK program, but uses data through 2010.


[Map of return period in years for hurricanes passing within 50 nautical miles]

Estimated return period in years for hurricanes passing

within 50 nautical miles of various locations on the U.S. Coast


[Map of return period in years for major hurricanes passing within 50 nautical miles]

Estimated return period in years for major hurricanes passing

within 50 nautical miles of various locations on the U.S. Coast

CONUS Hurricane Strikes

 


[Map of 1950-2011 CONUS Hurricane Strikes]

1950-2011 CONUS Hurricane Strikes (Courtesy of NCDC)

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Tropical Intensity Index

Tropical Intensity Index

Current Vorticity

850mb
Current Vorticity
700mb
Current Vorticity

Favorable Conditions for Development


12 Hour Forecast 12 Hour Favorable Conditions for Tropical Development Forecast

24 Hour Forecast 24 Hour Favorable Conditions for Tropical Development Forecast

48 Hour Forecast 48 Hour Favorable Conditions for Tropical Development Forecast

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Saharan Air Layer (SAL)

Global Jet Stream & 250 mb

Vertical Wind Shear

Current Sea Surface Tempatures


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Gulf Of Mexico
Sea Surface Temps

Sea Surface Temperature Anomaly


Sea Surface Temperature Analomy
Sea Surface Temps Anomaly

Tropical Cyclone Heat Potential

Wind Shear
Wind Shear
Tropical Cyclone Heat Potential

Current Wind Shear


Wind Shear
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Shear Tendency Past 24 Hours


Wind Shear

Future Shear Forecasts


24 hour Future Wind Shear

48 hour Future Wind Shear

72 hour Future Wind Shear

Vertical Wind Shear

Vertical Wind Shear
Vertical Wind Shear

Current Wind Direction

ASCAT Data (Ascending/Descending)


Ascending ASCAT

Descending ASCAT

Atlantic Sea Height / Waves

Atlantic Sea Height / Waves
Atlantic Sea Height / Waves
Atlantic Sea Height / Waves

Global / Atlantic Wave Heights

Global Wave HeightsAtlantic Wave HeightsAtlantic Wave HeightsAtlantic Wave Heights