Is it true that leaves curl when it's going to rain?
606807
Some curl, some flip over.
5861
No.  The cloud will form when the ambient temperature inside the cloud is lower than the dew point.  The moisture may actually form snow (on a summer day!) which melts on the way down to form rain.  The temperature outside the cloud may be less relevant because clouds often form when a column of moisture-laden air rises locally condensing into a  cloud right above the column.
185111
It's easy to remember if you understand the basics of why the rotation happens. At the equator the air, moving with the earth, has a high west-to-east speed. In each hemisphere, heat drives a general equatorial-polar circulation of air. Because of the high eastward speed at the equator, in the northern hemisphere air moving north from the equator or south toward it appears to bear to the right due to Coriolis effect. (This is often illustrated by a funhouse turntable where someone rolls a ball from the edge toward the center. If the turntable is rotating CCW, like earth viewed from over the north pole, the ball curves right. If someone rolls the ball from center to edge it still curves right.)\nNow consider that air flows toward a low pressure system, and any air with a north or south velocity component curves right. This induces a CCW rotation. Similarly, air flowing away from a high pressure system and curving right induces CW motion. An interesting side effect of inflow toward a low is that conservation of angular momentum causes angular velocity, and thus wind speed, to increase as you approach the center of a low, but not in the case of a high. Thus lows tend to be much more dynamic and occasionally to spawn tornados. \nIn the southern hemisphere, motion along the equator-pole direction results in turning left, so low and high pressure system rotations are CW and CCW respectively.
869615
Pressure changes affect the wind.  Temperature change determines whether it will rain or snow.
257450
No. It's how light reflects and refracts inside of each droplet. The inside rainbow has a different number of reflections internal to the raindrop than the outside rainbow does, so you get a different angle. It turns out that every drop, no matter what the size, has the same angles of refraction and reflection (as long as the raindrop is spherical), so the 42 degrees is reliable across different drops.
56061
Yes, if that is the direction they are flying. If the wind changes direction though they don't change. So not ALL the time as the question implies.
24156
No!  Yet more bad science frequently stated in classrooms around the world.  Students in science classes are often told that the coriolis effect causes water spiral out the toilet and drains in opposite directions in different hemespheres.  This is not true.\n\nCyclones (tornadoes, hurricanes, typhoons, etc) DO spiral in opposite directions in the two hemespheres as a result of the coriolis effect, counter-clockwise in the northern hemisphere, and clockwise in the southern hemisphere.
235687
It doesn't.  That's why most boys in Tennessee use a rock hanging from a string to emulate a complete weather station.  If the rock is swinging, the wind is blowing.  If the rock is wet, it's raining.  If the rock is gone, it's a tornado.
14911
Yes.  Although it is not called Lake effect. \nIt is called Ocean effect.  This happens on Cape Cod, in Massachusetts.
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The water is in the form of a vapor or gas, like steam.  When the vapor becomes concentrated enough to form droplets, it turns to rain.
502136
Actually, it is the rotation of the earth that causes weather and then clouds.\nThe clouds move across the sky as a result of differences in heat between regions. All of the matter around the earth is held to it by gravity. However, clouds "float" in air. So they will move at slightly different speeds. \n\nEver watch when they stir a milkshake? the different colors all swirl similarly.
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Rain, rain, don't go away.\nLet's catch some drops and save some water.
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when it rains, it pours.\n\nHope you don't live on/near a hillside.
1081990
on a cloudy day when it rains a little
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In my opinion, Saturday will rain
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Just a silly way to answer.\n\nIf it is Saturday, it is Saturday, but if it rains, then it is a rainy day.
637036
Pitches r different due to different environmental conditions, atmosphere taking into account the humidity level,amount of rain.\nAnd moreover,it also depends on the amount of work done on it like rolling again and again!