alerts                  Weather Alerts for United States and Europe
almanac                 Average and record high and low temperatures
                        for current date going back as far as weather
                        underground has data or from the national
                        weather service going back 30 years.
as.numeric.nonempty     as.numeric with special handling for length 0
                        (NULL) objects
astronomy               Moon phase, sunrise and sunset times for today.
base_url                Base URL for wunderground API
build_url               Build wunderground request URL
conditions              Current conditions including current
                        temperature, weather condition, humidity, wind,
                        feels-like, temperature, barometric pressure,
                        and visibility.
current_hurricane       Current hurricane - within the US only. Note:
                        all times in eastern
dst_POSIXct             Return POSIXct time from 7 variables.
dst_repeat_starttime    Find the text to POSIXct ambiguous interval.
encode_NA               Processes data.frames and replaces
                        wunderground's -9999/-999 to NAs
forecast10day           Forecast for the next 10 days.
forecast3day            Forecast for the next 3 days.
geolookup               Lists nearby weather stations for a given
                        location
get_api_key             Returns the wunderground API key
has_api_key             Detects if wunderground API key is set
history                 Hourly weather data for specified date.
history_daily           Summarized weather data for specified date.
history_range           Hourly weather data for specified date range.
hourly                  Hourly forecast for the next 24 hours.
hourly10day             Hourly forecast for the next 10 days.
is_fall_back_day        Check if a date is a "fall back" transition
                        from DST.
is_valid_airport        Checks if airport code is valid
is_valid_territory      Checks if country/state is a valid one
list_airports           Returns a data.frame of valid airport codes
                        (ICAO and IATA).
list_countries          Returns a data.frame of valid countries with
                        iso abbreviations and region
list_states             Returns a data.frame of valid states with
                        abbreviations and regions
lookup_airport          Lookup airport code (IATA and ICAO code).
                        weatherunderground API might not recognize the
                        IATA/ICAO code for smaller airports.
lookup_country_code     Lookup ISO country code weatherunderground API
                        doesn't recognize iso codes uniformly for every
                        country.name
measurement_exists      Check if a variable exists for a PWS. If not
                        set the value to -9999
nonempty                return object, or NA for length 0 (NULL)
                        objects
planner                 Weather summary based on historical information
                        between the specified dates
rawtide                 Raw Tidal data with data every 5 minutes for US
                        locations Tidal information only available for
                        US cities.  Units are in feet.
satellite               Returns image URL for satellite imagery
set_api_key             Sets the wunderground API key
set_location            Specifies location of request
stop_for_error          Detect and stop for any wunderground request
                        errors
tide                    Tidal information for a location within the
                        USA. Tidal information only available for US
                        cities.  Units are in feet.
webcam                  Returns locations of personal weather stations
                        along with URLs for their webcam images
wunderground_request    wunderground api requests
yesterday               Weather data for yesterday
