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Old 21 August 2009, 05:04 PM
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snopes snopes is offline
 
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Ponder Fireworks cause rain

Comment: Do July 4th fireworks cause rain on July 5th? I have family
members who insist this is true based on the smoke generated by the
fireworks display "seeding" the clouds. Their claim is that it "always"
rains on July 5th as a result. I think this is nonsense based on a few
coincidences over the years. I can find no scientific support for this
seeming folktale - who is right?
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Old 22 August 2009, 01:38 AM
Mycroft Mycroft is offline
 
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Gunpowder smoke is used in cloud seeding to initiate rainfall (it was done before the Beijing Olympics to try and ensure dry weather for the opening)
Although this could be the case for July 4th (and November 5th in the UK) the use of fireworks would not be as effective in cloud seeding as the smoke would not be high enough to introduce condensation nucleii into the clouds (typically cloud seeding involves dry ice or silver iodide dropped into the cloud from above)
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Old 22 August 2009, 09:25 AM
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I found a reference to smoke from factories causing slightly increased rainfall on weekdays, but only by a few percent, so fireworks are hardly likely to guarantee rain the next day.

http://articles.adsabs.harvard.edu//...00171.000.html
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  #4  
Old 22 August 2009, 05:02 PM
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This myth was, IIRC, very prevalent in the rain-starved Dust Bowl during the Great Depression.
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