--- a/mm7_3.cpp	Sat Mar 23 20:22:51 2013 +0200
+++ b/mm7_3.cpp	Sat Mar 23 21:11:15 2013 +0200
@@ -6687,7 +6687,7 @@
   {
     v4 = (MapInfo *)thisa;
   }
-  day_attrib &= 0xFFFFFFFEu;
+  day_attrib &= ~DAY_ATTRIB_FOG;
   dword_6BE13C_uCurrentlyLoadedLocationID = v2;
   pOutdoor->Initialize(
     pFilename,
@@ -6826,7 +6826,7 @@
     return PaletteManager::Get(a2);
   if ( !pWeather->bNight )
   {
-    if ( day_attrib & 1 )
+    if (day_attrib & DAY_ATTRIB_FOG)
     {
       v14 = day_fogrange_1 << 16;
       if ( a3 >= day_fogrange_1 << 16 )
@@ -6959,7 +6959,7 @@
     v10 = 0;
   if ( !v10 )
   {
-    if ( !(day_attrib & 1) && !bUnderwater )
+    if ( !(day_attrib & DAY_ATTRIB_FOG) && !bUnderwater )
     {
       v14 = a5;
       v15 = a6;
@@ -7234,13 +7234,13 @@
 
   if ( bUnderwater )
   {
-    result = 0xFF258F5Cu;
-  }
-  else
-  {
-    if ( day_attrib & 1 )
-    {
-      if ( pWeather->bNight )
+    result = 0xFF258F5C;
+  }
+  else
+  {
+    if (day_attrib & DAY_ATTRIB_FOG)
+    {
+      if ( pWeather->bNight ) // night-time fog
       {
         __debugbreak(); // decompilation can be inaccurate, please  send savegame to Nomad
         v2 = -(pWeather->bNight != 1);
@@ -7253,9 +7253,7 @@
       }
     }
     else
-    {
-      result = 0;
-    }
+      return 0;
   }
   return result;
 }
@@ -7278,7 +7276,7 @@
   v3 = pWeather->bNight;
   if ( bUnderwater == 1 )
     v3 = 0;
-  if ( pParty->armageddon_timer || !(day_attrib & 1) && !bUnderwater )
+  if ( pParty->armageddon_timer || !(day_attrib & DAY_ATTRIB_FOG) && !bUnderwater )
     return 0xFF000000;
   if ( v3 )
   {