Label remaining fields in Weather struct

src/field_weather_effect.c

@@ -941,13 +941,14 @@ static void InitSnowflakeSpriteMovement(struct Sprite *sprite)
 
 static void WaitSnowflakeSprite(struct Sprite *sprite)
 {
-    if (gWeatherPtr->unknown_6E2 > 18)
+    // Timer is never incremented
+    if (gWeatherPtr->snowflakeTimer > 18)
     {
         sprite->invisible = FALSE;
         sprite->callback = UpdateSnowflakeSprite;
         sprite->pos1.y = 250 - (gSpriteCoordOffsetY + sprite->centerToCornerVecY);
         sprite->tPosY = sprite->pos1.y * 128;
-        gWeatherPtr->unknown_6E2 = 0;
+        gWeatherPtr->snowflakeTimer = 0;
     }
 }
 
@@ -1519,7 +1520,7 @@ void Ash_InitVars(void)
     gWeatherPtr->weatherGfxLoaded = FALSE;
     gWeatherPtr->gammaTargetIndex = 0;
     gWeatherPtr->gammaStepDelay = 20;
-    gWeatherPtr->unknown_6FE = 20;
+    gWeatherPtr->ashUnused = 20; // Never read
     if (!gWeatherPtr->ashSpritesCreated)
     {
         Weather_SetBlendCoeffs(0, 16);