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A hole punch cloud at sunrise this morning. They form in cirrocumulus or altocumulus clouds that are below freezing, but the water has not frozen yet. Then when a portion of the water does start to freeze, it will set off a domino effect, causing the water vapor around it to freeze and fall. Scientists do not quite know how they start, but they do seem linked to airplanes. I have a theory as to how they start: Sound from an airplane hits the supercooled water droplets and causes them to freeze. Does that sound plausible?
| Categories: clouds, sunrise sunset | Camera Type: Canon EOS DIGITAL REBEL |
| Manufacturer: | Canon |
| Model: | Canon EOS DIGITAL REBEL |
| Orientation: | top - left |
| x-Resolution: | 180.00 |
| y-Resolution: | 180.00 |
| Resolution Unit: | Inch |
| YCbCr Positioning: | centered |
| Compression: | JPEG compression |
| Exposure Time: | 1/60 sec. |
| FNumber: | f/6.3 |
| ISO Speed Ratings: | 100 |
| Exif Version: | Exif Version 2.21 |
| Components Configuration: | Y Cb Cr - |
| Compressed Bits per Pixel: | 3.00 |
| Shutter speed: | 5.91 EV (APEX: 7, 1/60 sec.) |
| Aperture: | 5.31 EV (f/6.3) |
| Exposure Bias: | -0.67 EV |
| MaxApertureValue: | 3.61 EV (f/3.5) |
| Metering Mode: | Pattern |
| Flash: | Flash did not fire. |
| Focal Length: | 18.0 mm |
| User Comment: | |
| FlashPixVersion: | FlashPix Version 1.0 |
| Color Space: | sRGB |
| PixelXDimension: | 800 |
| PixelYDimension: | 533 |
| Focal Plane x-Resolution: | 3443.95 |
| Focal Plane y-Resolution: | 3442.02 |
| Focal Plane Resolution Unit: | Inch |
| Sensing Method: | One-chip color area sensor |
| File Source: | DSC |
| Custom Rendered: | Normal process |
| Exposure Mode: | Auto exposure |
| White Balance: | Auto white balance |
| Scene Capture Type: | Standard |
| InteroperabilityIndex: | R98 |
| InteroperabilityVersion: | 0100 |
| RelatedImageWidth: | 3072 |
| RelatedImageLength: | 2048 |
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