county_events: Find events for storms by county

In geanders/hurricaneexposure: Explore and Map County-Level Hurricane Exposure in the United States

Description

Takes a list of US counties, based on their 5-digit Federal Information Processing Standard (FIPS) codes, boundaries on the range of years to be considered, and the type of event (e.g., "flood", "tornado") and returns a list of all storms with listings for that type of event for the counties. This output is based on listings in the NOAA Storm Events database. See the help documentation for the storm_events dataset for more information and references on the data source used by this function.

Usage

county_events(counties, start_year, end_year, event_type)

Arguments

counties	Character vector of the five-digit Federal Information Processing Standard (FIPS) codes for counties for which the user wants to determine storm exposure.
start_year	Four-digit integer with first year to consider.
end_year	Four-digit integer with last year to consider.
event_type	Character string with the type of event to use to identify county exposures. Options include "flood", "tornado", "wind", and "tropical_storm".

Value

Returns a dataframe with a row for each county-storm pair and with columns for:

• fips: County's 5-digit Federal Information Processing Standard (FIPS) code

• storm_id: Unique storm identifier with the storm name and year, separated by a hyphen (e.g., "Alberto-1988", "Katrina-2005")

• usa_atcf_id: United States Automated Tropical Cyclone Forecasting storm identifier

• closest_time_utc: Time, in UTC, of the closest approach of the storm to the county's population mean center, based on storm tracks linearly interpolated to 15-minute increments.

• storm_dist: Minimum distance (in kilometers) between the storm's track and the county's population mean center.

• local_time: Local time of the closest approach of the storm to the county's population mean center, based on storm tracks linearly interpolated to 15-minute increments.

• closest_date: Date (based on local time) of the closest approach of the storm to the county's population mean center.

Note

Of the event types that this function can pull, only "tornado" and "wind" are available for years before 1996. Therefore, this function will pull listed tornado events or wind events for all years, but for any other event type, you should not use a start year prior to 1996, as events of other types were not recorded in the database before 1996.

Examples

# Ensure that data package is available before running the example.
#  If it is not, see the `hurricaneexposure` package vignette for details
# on installing the required data package.
if (requireNamespace("hurricaneexposuredata", quietly = TRUE)) {

county_events(counties = c("37031", "37053", "37055"),
              start_year = 1996, end_year = 2018,
              event_type = "flood")

county_events(counties = c("37055"),
              start_year = 1996, end_year = 2018,
              event_type = "tropical_storm")
}

geanders/hurricaneexposure documentation built on Feb. 16, 2020, 8:19 a.m.