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#1
December 12th 12, 12:05 PM
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Minimum temps
Excuse my ignorance ,but how much does fog effect minimum temps ?,
Does it act like a cloud blanket obscuring the clear skies above,or does precipitating rime affect the latent heat factor ? I should know this really after 60 years observing ! RonB |
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#2
December 12th 12, 01:10 PM
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Minimum temps
On Wednesday, December 12, 2012 12:05:19 PM UTC, ron button wrote:
Excuse my ignorance ,but how much does fog effect minimum temps ?, Does it act like a cloud blanket obscuring the clear skies above,or does precipitating rime affect the latent heat factor ? I should know this really after 60 years observing ! ============= Both. Fog is just cloud so acts in much the same way to arrest or slow temperature fall. And deposition of rime releases latent heat, ~2800 J/g or 680 cal/g at 0 deg C. Lots of reports from last night of temperatures dropping when rising out of valleys above the fog. Stephen. |
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#3
December 12th 12, 01:17 PM
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Minimum temps
"Stephen Davenport" wrote in message ... On Wednesday, December 12, 2012 12:05:19 PM UTC, ron button wrote: Excuse my ignorance ,but how much does fog effect minimum temps ?, Does it act like a cloud blanket obscuring the clear skies above,or does precipitating rime affect the latent heat factor ? I should know this really after 60 years observing ! ============= Both. Fog is just cloud so acts in much the same way to arrest or slow temperature fall. And deposition of rime releases latent heat, ~2800 J/g or 680 cal/g at 0 deg C. In persistent fogs the screen temperature rises due to heat flux from the surface combined with fog top cooling setting up weak convection currents which slowly overturns and mixes the fog. Will -- |
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