A. Weather modification programs worldwide
This map shows more than 150 weather modification programs operating in 37 countries worldwide. Weather modification techniques include hail suppression and precipitation enhancement. |
B. Weather modification programs operating in the United States
This map shows regions in the western United States engaged in precipitation enhancement and hail suppression. |
Videos
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| C. The impacts of air pollution on decreasing snowpack |
  Watch
video
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 Watch
video
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A before-and-after
view of inadvertent weather modification. This animation shows
the detrimental impacts of air pollution on orographic clouds that
produce snowpack over ranges like the Sierras that are downwind
from coastal cities. Click on the images to view the animations.
Credit: Prof. Daniel Rosenfeld, Hebrew University of Jerusalem, Israel |
| D. Aircraft-mounted flares release
cloud-seeding particles in flight |
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Flares
mounted in a rack off the wing of a small research aircraft burn
to release their water-attracting, or hygroscopic, particles during
a cloud-seeding experiment. Hygroscopic particles such as potassium/sodium
chloride create larger raindrops that fall more quickly, colliding
with smaller droplets on the way and stimulating rainfall. Click
on the image to view the video.
Credit: Roelof Bruintjes, NCAR |
| Contacts for This Release |
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For Journalists
David Hosansky, head of Media Relations
303-497-8611, hosansky@ucar.edu
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UCAR Communications
www.ucar.edu/news/contacts.shtml |
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General inquiries
Yvonne Mondragon,
303-497-8601, yvonnem@ucar.edu
Photo inquiries
Carlye Calvin, 303-497-8609, calvin@ucar.edu
Digital
Image Library
www.ucar.edu/imagelibrary |
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*News media reproduction to illustrate this story and nonprofit use permitted with proper attribution as provided above and acceptance of UCAR's terms of use. Find more images in the UCAR Digital Image Library.
The University Corporation for Atmospheric Research manages
the National Center for Atmospheric Research under sponsorship by the
National Science Foundation. Any opinions, findings and conclusions,
or recommendations expressed in this publication are those of the author(s)
and do not necessarily reflect the views of the National Science Foundation.
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