cyclones {GLMsData}

Cyclones near Australia

Description

The data give the number of severe and non-severe tropical cyclones from 1969 to 2005 in the Australian region

Usage

data(cyclones)

Format

A data frame with 37 observations on the following 8 variables.

Year

the year

Severe

the number of severe cyclones recorded; a numeric vector

NonSevere

the number of non-severe cyclones; a numeric vector

Total

the total number of cyclones (the sum of Severe and NonSevere); a numeric vector

JFM

the Ocean Nino Index, or oni, averaged over the months January to March; a numeric vector

AMJ

the Ocean Nino Index, or oni, averaged over the months April to June; a numeric vector

JAS

the Ocean Nino Index, or oni, averaged over the months July to September; a numeric vector

OND

the Ocean Nino Index, or oni, averaged over the months October to December; a numeric vector

Details

The data give the number of severe and non-severe cyclones tropical cyclones from 1970 to 2005 in the Australian region (south of equator; 105 to 160 degrees E). Severe cyclones are defined as those with a minimum central pressure less than 970 hPa.

The oni is based on a three-month running mean of ERSST.v3b Sea Surface Temperature (sst) anomalies in the Nino 3.4 region (5 degrees N to 5 degrees S, 120 degrees to 170 degrees W), based on the 1971 to 2000 base period.

Source

Cyclone information: http://www.bom.gov.au/cyclone/climatology/trends.shtml (accessed 04 April 2011).

Ocean Nino Index: http://www.cpc.ncep.noaa.gov/products/analysis_monitoring/ensostuff/ensoyears.shtml (accessed 04 April 2011).

Examples

data(cyclones)
plot(Severe~JFM, data=cyclones )