What is EMWIN?

A free datastream of real-time weather data from the National Weather Service.
A sample is what is available:
 
Graphical Products
World Composites
Lightning Data
Radar Summaries
Sea Surface Temperatures
Infrared Satellite Images
Hurricane Tracking Plot
AFOS Graphs
Forecast and current 
temperatures, dew points,
winds, pressure, precipitation,
CAPE, theta-E, frontal
analyses, freezing levels, etc.
Text Products
Watches, warnings, forecasts,
discussions, reports, climatic
data, etc.
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE GOODLAND KS
854 PM MDT (954 PM CDT) SAT JUN 26 1999

THE NATIONAL WEATHER SERVICE IN GOODLAND HAS ISSUED A
* TORNADO WARNING FOR...
  NORTHEASTERN DECATUR COUNTY IN NORTHWESTERN KANSAS
  RED WILLOW COUNTY IN SOUTHWESTERN NEBRASKA
* UNTIL 1100 PM CDT (1000 PM MDT)

* AT 953 PM CDT... GOODLAND DOPPLER RADAR INDICATED A TORNADO 20
  MILES NORTHEAST OF OBERLIN OR 15 MILES EAST OF CEDAR BLUFFS...
  MOVING SOUTHEAST AT 10 MPH.

* THE TORNADO IS EXPECTED TO BE NEAR...
  6 MILES NORTHWEST OF NORCATUR AROUND 1045 PM CDT

IF YOU ARE IN A MULTIPLE STORY BUILDING...GO TO A SMALL INTERIOR
ROOM AWAY FROM WINDOWS.

LAMMERS/ENTWISTLE

The datastream is received on your computer and processed using the Weathernode 4.0 software.  The products are available from pull-down menus, and alarms may be generated for any text product issued by the National Weather Service.  A module permits interfacing with X-10 controllers for full control of external devices.