local weather feeds

The Weather Underground has many associated personal stations that provide streaming weather data.  These report temperature, humidity, barometric pressure, conditions, wind direction, and wind speed.  In some areas there are enough stations to reveal local microclimates. You can create your own array of weather stations by adding to Weather Underground’s network.

weather underground rss files

Weather stations coordinates are mapped to XYZ space with a gHowl component.  The yellow cones are proportional to the wind speed reported at each station.

albemarle wind from lp on Vimeo

Wind speeds were recorded for several  Albemarle County stations on July 28, 2012 between noon and 1:00 PM.  Readings were taken about twice per minute from the weather underground RSS feed using the gHowl plug-in for GrassHopper.  Wind speeds ranged from 0 to 7 mph during this interval.  Note that these summer breezes could not be described as having a prevailing direction!


US wind

This is a simple definition that parses live wind data for Eastern US from the boy genius weather feed list.

Wind is represented as a vector extending from each weather station.  Wind is also shown as a delaunay topography. Note the sharp wind peak in Michigan! (This definition is based on a temperature map by Arthur Mamou-Mani.)

US wind definition

stockticker tutorial

Sometimes you might need a value on a website that is continually updated. This example will show how to pull a live Stock Market value into Grasshopper using the HTTP read component in Slingshot! to isolate and continually update the Apple stock value.

stockticker tutorial pdf

live data

National Data Buoy Center: wind data along the Chesapeake

This definition constantly updates live wind data from buoys along the Chesapeake Bay.  The wind speed is represented by circles around the buoys that are proportional to wind speed.  Wind speed is also represented as a mesh topography, with height proportional to wind speed at each buoy along the bay.

Chesapeake Wind definition


chesapeake wind from lp on Vimeo.

The live wind data from the Chesapeake buoys, sampled at about 20 minute intervals during a summer afternoon, evening, and morning, reveals a summer convective wind pattern with land breezes and sea breezes.