diff --git a/simgear/scene/sky/cloudfield.cxx b/simgear/scene/sky/cloudfield.cxx
index 313e255a..a567c91e 100644
--- a/simgear/scene/sky/cloudfield.cxx
+++ b/simgear/scene/sky/cloudfield.cxx
@@ -68,7 +68,6 @@ using namespace simgear;
 #endif
 
 float SGCloudField::fieldSize = 50000.0f;
-float SGCloudField::coverage = 1.0f;
 double SGCloudField::timer_dt = 0.0;
 float SGCloudField::view_distance = 20000.0f;
 sgVec3 SGCloudField::view_vec, SGCloudField::view_X, SGCloudField::view_Y;
@@ -151,6 +150,7 @@ SGCloudField::SGCloudField() :
 	deltay(0.0),
 	last_course(0.0),
 	last_coverage(0.0),
+        coverage(0.0),
         defined3D(false),
         reposition_count(0)
 {
@@ -211,10 +211,7 @@ void SGCloudField::clear(void) {
     for (int x = 0; x < QUADTREE_SIZE; x++) {
         for (int y = 0; y < QUADTREE_SIZE; y++) {
             int num_children = field_group[x][y]->getNumChildren();
-
-            for (int i = 0; i < num_children; i++) {
-                field_group[x][y]->removeChild(i);
-            }
+            field_group[x][y]->removeChildren(0, num_children);
         }
     }
     
@@ -239,7 +236,7 @@ static int densTable[][10] = {
 void SGCloudField::applyCoverage(void) {
 
         int row = (int) (coverage * 10.0);
-        if (row > 10) row = 9;
+        if (row > 9) row = 9;
         int col = 0;
 
         if (coverage != last_coverage) {
diff --git a/simgear/scene/sky/cloudfield.hxx b/simgear/scene/sky/cloudfield.hxx
index f844a98d..beab904d 100644
--- a/simgear/scene/sky/cloudfield.hxx
+++ b/simgear/scene/sky/cloudfield.hxx
@@ -83,7 +83,8 @@ private:
 	double deltax, deltay, alt;
         double last_course;
         sgSphere field_sphere;
-	float	last_coverage;
+	float last_coverage;
+        float coverage;
         SGGeoc cld_pos;
         int reposition_count;
         struct CloudFog : public simgear::Singleton<CloudFog>
@@ -121,15 +122,14 @@ public:
 
 	static sgVec3 view_vec, view_X, view_Y;
 
-	static float coverage;
         static float view_distance;
         static double timer_dt;
 	static float fieldSize;
 	
         bool defined3D;
 
-	static float getCoverage(void) { return coverage; }
-	static void setCoverage(float coverage) { coverage = coverage; }
+	float getCoverage(void) { return coverage; }
+	void setCoverage(float c) { coverage = c; }
 
         static float getVisRange(void) { return view_distance; }
         static void setVisRange(float d) { view_distance = d; }