Program: 81909
Project: 81909
Buggy source:
public void tick(){
  Random rand=new Random();
  if (!ConfigWind.Misc_windOn) {
    windSpeedGlobal=0;
    windSpeedGust=0;
    windTimeGust=0;
  }
 else {
    if (!manager.getWorld().isRemote) {
      if (!ConfigWind.Wind_LowWindEvents) {
        lowWindTimer=0;
      }
      if (lowWindTimer <= 0) {
        if (windSpeedGlobalRandChangeTimer-- <= 0) {
          if (highWindTimer <= 0) {
            windSpeedGlobal+=(rand.nextDouble() * windSpeedGlobalChangeRate) - (windSpeedGlobalChangeRate / 2);
          }
 else {
            windSpeedGlobal+=(rand.nextDouble() * windSpeedGlobalChangeRate);
          }
          windSpeedGlobalRandChangeTimer=windSpeedGlobalRandChangeDelay;
        }
        if (highWindTimer <= 0) {
          if (ConfigWind.Wind_LowWindEvents) {
            if (rand.nextInt(ConfigWind.lowWindOddsTo1) == 0) {
              startLowWindEvent();
              Weather.dbg("String_Node_Str" + lowWindTimer);
            }
          }
        }
        if (ConfigWind.Wind_HighWindEvents) {
          if (rand.nextInt(ConfigWind.highWindOddsTo1) == 0) {
            startHighWindEvent();
            Weather.dbg("String_Node_Str" + highWindTimer);
          }
        }
      }
 else {
        lowWindTimer--;
        windSpeedGlobal-=0.01F;
      }
      if (highWindTimer > 0) {
        highWindTimer--;
      }
      if (windSpeedGlobal < windSpeedMin) {
        windSpeedGlobal=windSpeedMin;
      }
      if (windSpeedGlobal > windSpeedMax) {
        windSpeedGlobal=windSpeedMax;
      }
      if (windTimeGust > 0) {
        windTimeGust--;
        if (windTimeGust == 0) {
          syncData();
        }
      }
      float randGustWindFactor=1F;
      if (this.windTimeGust == 0 && lowWindTimer <= 0 && highWindTimer <= 0) {
        if (chanceOfWindGustEvent > 0F) {
          if (rand.nextInt((int)((100 - chanceOfWindGustEvent) * randGustWindFactor)) == 0) {
            windSpeedGust=windSpeedGlobal + rand.nextFloat() * 0.6F;
            windAngleGust=rand.nextInt(360) - 180;
            setWindTimeGust(rand.nextInt(windGustEventTimeRand));
          }
        }
      }
      windAngleGlobal+=((new Random()).nextInt(5) - 2) * 0.2F;
      if (windAngleGlobal < -180) {
        windAngleGlobal+=360;
      }
      if (windAngleGlobal > 180) {
        windAngleGlobal-=360;
      }
    }
 else {
      tickClient();
    }
  }
}

Fixed version (ground truth):
public void tick(){
  Random rand=new Random();
  if (!ConfigWind.Misc_windOn) {
    windSpeedGlobal=0;
    windSpeedGust=0;
    windTimeGust=0;
  }
 else {
    if (!manager.getWorld().isRemote) {
      if (!ConfigWind.Wind_LowWindEvents) {
        lowWindTimer=0;
      }
      if (lowWindTimer <= 0) {
        if (windSpeedGlobalRandChangeTimer-- <= 0) {
          if (highWindTimer <= 0) {
            windSpeedGlobal+=(rand.nextDouble() * windSpeedGlobalChangeRate) - (windSpeedGlobalChangeRate / 2);
          }
 else {
            windSpeedGlobal+=(rand.nextDouble() * windSpeedGlobalChangeRate);
          }
          windSpeedGlobalRandChangeTimer=windSpeedGlobalRandChangeDelay;
        }
        if (highWindTimer <= 0) {
          if (ConfigWind.Wind_LowWindEvents) {
            if (rand.nextInt(ConfigWind.lowWindOddsTo1) == 0) {
              startLowWindEvent();
              Weather.dbg("String_Node_Str" + lowWindTimer);
            }
          }
        }
        if (ConfigWind.Wind_HighWindEvents && highWindTimer <= 0) {
          if (rand.nextInt(ConfigWind.highWindOddsTo1) == 0) {
            startHighWindEvent();
            Weather.dbg("String_Node_Str" + highWindTimer);
          }
        }
      }
 else {
        lowWindTimer--;
        if (lowWindTimer <= 0) {
          Weather.dbg("String_Node_Str");
        }
        windSpeedGlobal-=0.01F;
      }
      if (highWindTimer > 0) {
        highWindTimer--;
        if (highWindTimer <= 0) {
          Weather.dbg("String_Node_Str");
        }
      }
      if (windSpeedGlobal < windSpeedMin) {
        windSpeedGlobal=windSpeedMin;
      }
      if (windSpeedGlobal > windSpeedMax) {
        windSpeedGlobal=windSpeedMax;
      }
      if (windTimeGust > 0) {
        windTimeGust--;
        if (windTimeGust == 0) {
          syncData();
        }
      }
      float randGustWindFactor=1F;
      if (this.windTimeGust == 0 && lowWindTimer <= 0 && highWindTimer <= 0) {
        if (chanceOfWindGustEvent > 0F) {
          if (rand.nextInt((int)((100 - chanceOfWindGustEvent) * randGustWindFactor)) == 0) {
            windSpeedGust=windSpeedGlobal + rand.nextFloat() * 0.6F;
            windAngleGust=rand.nextInt(360) - 180;
            setWindTimeGust(rand.nextInt(windGustEventTimeRand));
          }
        }
      }
      windAngleGlobal+=((new Random()).nextInt(5) - 2) * 0.2F;
      if (windAngleGlobal < -180) {
        windAngleGlobal+=360;
      }
      if (windAngleGlobal > 180) {
        windAngleGlobal-=360;
      }
    }
 else {
      tickClient();
    }
  }
}