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#1
May 16th 05, 04:23 PM
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Fall streak hole?
A while ago Jack Harrison published a gliding photo of an unusual hole in a
high cloud deck over mountains. An idea I've had is that it was the top of a fall streak hole caused by wave interaction.I've now found a precedent for the idea- Annales Geophysicae (2002) 20: 711 - 715 An explanation for some fallstreak clouds R. M. Worthington Abstract. Fallstreak cirrus clouds are associated with super-saturated air, together with waves, instabilities and/or turbulence; however, their precise cause is usually uncertain. This paper uses already-published satellite, radiosonde and radar data, reanalysed to study some large fallstreaks which had been previously overlooked. The fallstreaks - up to 60 km long with a parent cloud 20 km wide - are caused by lifting and/or turbulence from a mountain wave, rather than, for example, Kelvin-Helmholtz instabilities. If turbulent breaking of mountain waves affects ice particle formation, this may be relevant for the seeder-feeder effect on orographic rain, and the efficiency of mountain-wave polar stratospheric clouds for ozone depletion. online at- http://www.copernicus.org/EGU/annales/20/5/711.htm (Sorry Jack-lost yr address and my guess was bounced back to me) -- regards, David add '17' to Waghorne to reply |
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#2
May 16th 05, 05:40 PM
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Fall streak hole?
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#3
May 16th 05, 05:40 PM
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Fall streak hole?
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#4
May 16th 05, 05:40 PM
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Fall streak hole?
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#5
May 16th 05, 05:46 PM
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Fall streak hole?
Dear Mr Waghorn ,that is truly a marvelous picture, I now use it as my
desktop picture so can enjoy it everyday RonB "Waghorn" wrote in message ... A while ago Jack Harrison published a gliding photo of an unusual hole in a high cloud deck over mountains. An idea I've had is that it was the top of a fall streak hole caused by wave interaction.I've now found a precedent for the idea- Annales Geophysicae (2002) 20: 711 - 715 An explanation for some fallstreak clouds R. M. Worthington Abstract. Fallstreak cirrus clouds are associated with super-saturated air, together with waves, instabilities and/or turbulence; however, their precise cause is usually uncertain. This paper uses already-published satellite, radiosonde and radar data, reanalysed to study some large fallstreaks which had been previously overlooked. The fallstreaks - up to 60 km long with a parent cloud 20 km wide - are caused by lifting and/or turbulence from a mountain wave, rather than, for example, Kelvin-Helmholtz instabilities. If turbulent breaking of mountain waves affects ice particle formation, this may be relevant for the seeder-feeder effect on orographic rain, and the efficiency of mountain-wave polar stratospheric clouds for ozone depletion. online at- http://www.copernicus.org/EGU/annales/20/5/711.htm (Sorry Jack-lost yr address and my guess was bounced back to me) -- regards, David add '17' to Waghorne to reply |
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#6
May 16th 05, 05:46 PM
posted to uk.sci.weather
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Fall streak hole?
Dear Mr Waghorn ,that is truly a marvelous picture, I now use it as my
desktop picture so can enjoy it everyday RonB "Waghorn" wrote in message ... A while ago Jack Harrison published a gliding photo of an unusual hole in a high cloud deck over mountains. An idea I've had is that it was the top of a fall streak hole caused by wave interaction.I've now found a precedent for the idea- Annales Geophysicae (2002) 20: 711 - 715 An explanation for some fallstreak clouds R. M. Worthington Abstract. Fallstreak cirrus clouds are associated with super-saturated air, together with waves, instabilities and/or turbulence; however, their precise cause is usually uncertain. This paper uses already-published satellite, radiosonde and radar data, reanalysed to study some large fallstreaks which had been previously overlooked. The fallstreaks - up to 60 km long with a parent cloud 20 km wide - are caused by lifting and/or turbulence from a mountain wave, rather than, for example, Kelvin-Helmholtz instabilities. If turbulent breaking of mountain waves affects ice particle formation, this may be relevant for the seeder-feeder effect on orographic rain, and the efficiency of mountain-wave polar stratospheric clouds for ozone depletion. online at- http://www.copernicus.org/EGU/annales/20/5/711.htm (Sorry Jack-lost yr address and my guess was bounced back to me) -- regards, David add '17' to Waghorne to reply |
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#7
May 16th 05, 05:46 PM
posted to uk.sci.weather
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Fall streak hole?
Dear Mr Waghorn ,that is truly a marvelous picture, I now use it as my
desktop picture so can enjoy it everyday RonB "Waghorn" wrote in message ... A while ago Jack Harrison published a gliding photo of an unusual hole in a high cloud deck over mountains. An idea I've had is that it was the top of a fall streak hole caused by wave interaction.I've now found a precedent for the idea- Annales Geophysicae (2002) 20: 711 - 715 An explanation for some fallstreak clouds R. M. Worthington Abstract. Fallstreak cirrus clouds are associated with super-saturated air, together with waves, instabilities and/or turbulence; however, their precise cause is usually uncertain. This paper uses already-published satellite, radiosonde and radar data, reanalysed to study some large fallstreaks which had been previously overlooked. The fallstreaks - up to 60 km long with a parent cloud 20 km wide - are caused by lifting and/or turbulence from a mountain wave, rather than, for example, Kelvin-Helmholtz instabilities. If turbulent breaking of mountain waves affects ice particle formation, this may be relevant for the seeder-feeder effect on orographic rain, and the efficiency of mountain-wave polar stratospheric clouds for ozone depletion. online at- http://www.copernicus.org/EGU/annales/20/5/711.htm (Sorry Jack-lost yr address and my guess was bounced back to me) -- regards, David add '17' to Waghorne to reply |
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