diff --git a/Data/AI/bigstorm_demo.xml b/Data/AI/bigstorm_demo.xml
index f6082e6a5..643ed1d74 100644
--- a/Data/AI/bigstorm_demo.xml
+++ b/Data/AI/bigstorm_demo.xml
@@ -2,13 +2,16 @@
 
 <!-- Notes:
 
-     This scenario puts a thunderstorm with lightning over San
-     Francisco at 5000 feet MSL.  The "bottom" of the 
-     thunderstorm is at 5000 feet, with parts extending above
-     and rain below it.  The storm is moving on a true heading
-     of 100 degrees, at a ground speed of 25 knots.  AI
-     thunderstorms do not (yet) interact with the "user" airplane.
-     It also does not interact with terrain. 
+     This scenario puts a thunderstorm with lightning and 
+     turbulence over San Francisco at 5000 feet MSL.  The 
+     "bottom" of the thunderstorm is at 5000 feet, with parts
+     extending above and rain below it.  The storm is moving on
+     a true heading of 100 degrees, at a ground speed of 25 knots.
+
+     The AI thunderstorm contains a cylindrical zone of turbulence,
+     with a diameter set by <diameter-ft>, a top set by <height-msl>,
+     a bottom equal to <altitude> minus 1000 feet, and a strength
+     set by <strength-norm>.  It does not interact with terrain. 
 
      Dave Culp, davidculp2@comcast.net 
 -->
@@ -19,12 +22,15 @@
 
   <entry>
    <type>thunderstorm</type>
-   <model>Models/Weather/bigstorm.xml</model>
+   <model>Models/Geometry/bigstorm.xml</model>
    <latitude>37.7</latitude>
    <longitude>-122.5</longitude>
    <speed>25.0</speed>
    <altitude>5000.0</altitude>
    <heading>100.0</heading>
+   <diameter-ft>21048.0</diameter-ft>
+   <height-msl>38000.0</height-msl>
+   <strength-norm>1.0</strength-norm>
   </entry>
 
  </scenario>