http://www.youtube.com/watch?v=yXnkzeCU3bE

"Sunday's winds across Minnesota were the result of a rapid drop in barometric pressure caused by a gravity wave that moved from Iowa into the central MN between 8 am and 11 am. Check out this incredible video of Sunday's gravity wave as it was moving through Iowa" KSTP.com

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'07 Yukon 2500
'13 Subaru Outback 3.6R
'13 Orbea Carpe 9-speed

Currently Benzless
Formerly: 300TD, S600, E55, 560SEL

---= The forest breathes, listen.
-Native American elder

:\ We always learned that acceleration due to gravity was a constant 9.8 on earth... it changes?!?

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Ich liebe meine Autos!

1991 Mercedes-Benz 560SEL | Megasquirt MS3-Pro | 722.6 transmission w/ AMG paddles | Feind Motorsports Sway Bar | Stinger VIP Radar | AntiLaser Priority | PLX Wideband O2 | 150A Alternator | Cat Delete
1981 Mercedes-Benz 300SD | Blown engine, rebuilding someday...
1981 Mercedes-Benz 300SD | Rear ended, retired in garage.
2009 Yamaha AR230HO | Das Boot

Excessive speeding? It ain't excessive till I redline!

I think it's weather slang for a sudden drop in barometric pressure, thus affecting cloud movement/formation.

__________________
'07 Yukon 2500
'13 Subaru Outback 3.6R
'13 Orbea Carpe 9-speed

Currently Benzless
Formerly: 300TD, S600, E55, 560SEL

---= The forest breathes, listen.
-Native American elder

I don't know about gravity waves, but surfing one sounds kind of cool.

The gravitational constant of Earth is an average. It varies locally with local density. So for example, if you were to fly from the Mississippi River to the Llano Estacado in an aeroplane with a gravimeter you'd notice the gravity around the Mississippi has less than average acceleration. Moving across central TX you'd pick-up a great increase just west of Austin where you cross a massive granite formation, larger than Stone Mountain (but mostly subsurface except for Enchanted Rock) and then a reduction until you got on the other side of the Permian Basin.

There are gravity maps of the USA that are pretty interesting. If I remember correctly, the gravimeters have become refined such that they can track magma movement.

B