Gut Rumbles

June 13, 2006

severe storm warnings

"We interrupt this program to advise... a line of severe thunderstorms, with high winds and marble-sized hail... is detected on Doppler Radar (and I'll give you a bag of freshly boiled green peanuts if you can tell me what a "Doppler Effect" is), moving north by northeast, possibly affecting the areas of Chatham, Effingham, Bryan and Liberty Counties in southeast Georgia. Please remain indoors if severe weather strikes your area and stay tuned to this Emergency Broadcast Channel."

Bring it on.


Doppler Effect: The thing that makesmakes a train whistle go higher in pitch as it gets nearer and then drop in pitch as it passes by and travels away.

Keep yer peanuts.

Posted by: Daniel Medley on June 13, 2006 12:22 PM

Daniel is correct..but the REASON the sound sounds different is because the sound waves are compressed more when approaching the source, making it SOUND higher pitched. The measure in difference in frequency can also give you the true speed of an object.

Posted by: Kelly on June 13, 2006 01:06 PM

The Doppler Effect, so far as it's relation to weather radar goes, allows one to measure the motion of things that are typically rather difficult to measure via radar (e.g., clouds, rain).

Toss a bunch of RF at a cloud, and the frequency shift of the reflection will tell you where it's going and how fast. From there a computer churns out the purty graphics.

That said, 90% of the weather images you see on TV and the like aren't doppler images. They're reflectivity images. Unless the talking head on the tube is talking about wind speed and such, which they usually don't, what they're blabbering about has jack shit to do with doppler radar.

Posted by: Mr. Lion on June 13, 2006 02:19 PM

Standing next to the track and watching (and listening) to the train coming and going by, the only thing I am sure of is that I missed this yourney, and I saw nothing of that flippen ball as well. Science 101.
Congrats Mr. Lion, "jack shit to do with doppler"
Monkey's eat their peanuts raw, thank you

Posted by: KeesKennis on June 13, 2006 02:45 PM

Okay - enough about the doppler effect. Does anyone else but me find it highly entertaining to watch how the weather people go all agagah whenever a storm approaches. Geebus - they act like the end of the world is approaching when all that's happening is a typical midwestern weather front.

Then there's the "my radar is better than your radar" contest. I mean, it started out with just simple weather radar. Then it was "Doppler" radar. Then it quickly became "Super doppler" radar. Now it's "Super doppler radar" with "Viper".

What is "Super Doppler" anyway.

I'm waiting for one of our local stations to come up with "Super Dooper Doppler Viper" radar.

It's coming I tell you - to a weather station near you.

Posted by: Roy on June 13, 2006 08:57 PM

In Space...
No one can hear Doppler....

Posted by: Horrabin on June 14, 2006 12:03 AM

The Doppler effect works with light waves in space the same as sound waves work on earth. Just a little faster.

Posted by: Ivan Ivanovich on June 14, 2006 06:07 AM

The Doppler effect, named after Christian Andreas Doppler, is the apparent change in frequency and wavelength of a wave that is perceived by an observer moving relative to the source of the waves. For waves, such as sound waves, that propagate in a wave medium, the velocity of the observer and the source are reckoned relative to the medium in which the waves are transmitted. The total Doppler effect may therefore result from either motion of the source or motion of the observer. Each of these effects is analyzed separately. For waves which do not require a medium, such as light or gravity in special relativity only the relative difference in velocity between the observer and the source needs to be considered.

Posted by: Peter on June 14, 2006 03:24 PM

Damn! These truly scientific explanations of the Doppler Effect really impress me.

I, however, might express the concept somewhat differently. Stand by a railroad track when the train, blowing its whistle, goes by REAL FAST. Hear that "WHHHHOOOO...WHhhooo.... woo sound? Notice how it seems to change pitch as it goes by?

That's the Doppler Effect. It's all about train whistles. That's all you need to know.

Doppler Radar? Well... that's just Pure Fucking Magic.

Posted by: Acidman on June 14, 2006 10:32 PM
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