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Topic: Cirrus cloud


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  USATODAY.com   (Site not responding. Last check: 2007-10-17)
These clouds are blown by strong westerly winds aloft into streamers known as "mares' tails" Cirrus clouds generally move from west to east across the sky and usually "point" to fair weather.
Cirrus clouds form when water vapor undergoes deposition and forms ice crystals.
Cirrus clouds are thin because they form in the higher levels of the atmosphere where little water vapor is present.
www.usatoday.com /weather/wcirrus.htm   (304 words)

  
 Types Of Clouds   (Site not responding. Last check: 2007-10-17)
The size of a cumulus cloud depends on the force of the upward movement of air and the amount of moisture in the air.
Cirrus clouds are a third general type of cloud.
Cirrus clouds are composed of ice crystals and are so thin that sunlight can pass right through them.
schoolscience.rice.edu /duker/weatypeclouds.html   (338 words)

  
 Cirrus Cloud Cover Percentage   (Site not responding. Last check: 2007-10-17)
The average wind direction at the cirrus cloud heights, determined by the rawinsonde, was used to calculate the direction to shift the HSRL data upwind.
Cirrus cloud cover percentages were calculated for the 60 km of VIL vertical profiles spaced every 100 m (Figure 3).
The change in the radiative flux caused by cirrus clouds for either time period would dominate the atmospheric temperature increases caused by the doubling of CO This implies that knowledge of the spatial structure is very important in understanding the radiative effects of cirrus clouds on the climate.
lidar.ssec.wisc.edu /papers/ww_thes/node10.htm   (2085 words)

  
 SWA******* GADS Cloud Model *******SWA
For a T106-based GADS, the AGM cloud model (Emmitt and Wood, 1995) is based on the Slingo cloud parameterization scheme (Slingo, 1987).
The major assumption is that while the Slingo model derives a percent cirrus cloud coverage (i.e., 30%) from an average relative humidity within a grid volume, it is just as reasonable to interpret a thickness tendency from the same fields.
Instead of using the percent coverage as literally meaning that 30% of the grid has cirrus cloud and 70% is totally cloud-free, the AGM assumes that the whole grid area is covered by a cirrus cloud that has an optical thickness that scales to the percent coverage.
www.swa.com /ALD/lsm/GADScloud.html   (1171 words)

  
 Cirrus Cloud Optical and Morphological Variations Within a Mesoscale Volume   (Site not responding. Last check: 2007-10-17)
The variation of the cirrus cloud features across the wind indicate the sampling errors associated with point measurements when they are used to describe the mesoscale cirrus cloud structure.
The average cloud length along the wind was 130 km while the average cloud length across the wind was 14 km.
The calibration was extended to all the cirrus clouds in the mesoscale volume imaged by the VIL.
lidar.ssec.wisc.edu /papers/ww_thes/thesis.htm   (408 words)

  
 Cirrus Clouds: thin and wispy   (Site not responding. Last check: 2007-10-17)
The most common form of high-level clouds are thin and often wispy cirrus clouds.
Typically found at heights greater than 20,000 feet (6,000 meters), cirrus clouds are composed of ice crystals that originate from the freezing of supercooled water droplets.
Cirrus generally occur in fair weather and point in the direction of air movement at their elevation.
ww2010.atmos.uiuc.edu /(Gh)/wwhlpr/cirrus.rxml?hret=/guides/mtr/cld/cldtyp/home.rxml   (57 words)

  
 Clouds From Space
All clouds block some fraction of the incoming solar radiation, and absorb some fraction of the heat radiated back from the Earth's surface, and the balance between these two processes is hard to quantify.
The amount of high-level cirrus cloud is predicted to rise as the cumulus decreases.
The V-shaped cloud structure is normally associated with cold fronts that cross the Gulf of Mexico and Florida in late winter and early spring.
www.solarviews.com /eng/cloud1.htm   (2219 words)

  
 Plymouth State Meteorology Program Cloud Boutique   (Site not responding. Last check: 2007-10-17)
Nimbostratus are often included in many texts as low clouds, but here they are considered multi-layer clouds because their vertical extent often goes well into the middle cloud region and these clouds often have even taller cumulonimbus clouds embedded within them.
Cap clouds form when air containing water vapor is uplifted on the windward slide of the slope and reaches saturation producing liquid water cloud droplets and a cloud which can "cap" the summit.
Another type of cloud can be formed from the vapor contained in the exhaust of a jet engine of an airplane when they are flying at high enough altitudes where cold temperatures cause the vapor to turn into ice crystals like cirrus clouds.
vortex.plymouth.edu /clouds.html   (1686 words)

  
 Clouds
Clouds give us a clue about what is going on in our atmosphere and how the weather might change in the hours or even days to come.
Cirrus clouds are high and thin and made entirely of ice crystals.
Cirrus clouds, which are a sign of warm moist air rising up over cold air, are sometimes an early signal that thickening clouds could bring light rain or snow within one or two days.
www.wxdude.com /page9.html   (823 words)

  
 BOM-cloud quiz
He carries a lightning walking stick that he uses to herd and scare people with and lives in a cloud environment, with a cloud house and cloud car etc. He has a cloud farm with a herd of fluffy cloud sheep.
For example, nimbostratus is a rain cloud that occurs in layers, whereas cumulonimbus is a rain cloud with pronounced vertical development.
Cirrostratus is cirrus occurring as a sheet-like cloud, and stratocumulus is a layer cloud with some cumulus features.
www.bom.gov.au /lam/Students_Teachers/animations/cloudzstart.shtml   (334 words)

  
 Cirrus Cloud Formation   (Site not responding. Last check: 2007-10-17)
Cirrus cloud ice crystals can grow larger in saturated conditions, as they draw on the water vapor around them in the cloud.
When they become too heavy for the air motions to hold them up, they fall from the cirrus cloud, just as snow, rain, or hail falls from clouds because they are too heavy for the air motions to keep them in the cloud where they formed.
As the ice crystals fall, the wind below the cloud blows them away, forming a "mares' tail", a form of virga (which means precipitation falling from a cloud but appearing to be attached to it), that is sometimes seen under the cirrus cloud.
www.newton.dep.anl.gov /askasci/wea00/wea00173.htm   (519 words)

  
 Cloud Types: common cloud classifications
Clouds are classified into a system that uses Latin words to describe the appearance of clouds as seen by an observer on the ground.
For example, cloud names containing the prefix "cirr-", as in cirrus clouds, are located at high levels while cloud names with the prefix "alto-", as in altostratus, are found at middle levels.
High-level clouds are typically thin and white in appearance, but can appear in a magnificent array of colors when the sun is low on the horizon.
ww2010.atmos.uiuc.edu /(Gh)/guides/mtr/cld/cldtyp/home.rxml   (329 words)

  
 New Technique Improves Cirrus Cloud Characterization
These studies indicated that cirrus clouds scatter the upwelling flux of submillimeter-wavelength radiation emitted by lower atmospheric water vapor back towards the Earth, thus reducing the upward flux of energy.
The ability of cirrus ice to scatter radiation is primarily a function of the amount of ice and the distribution of crystal sizes.
A Bayesian algorithm is used to invert a mathematical model of the radiometric properties of both cloud ice and water vapor.
www.nasatech.com /Briefs/Feb02/NPO21016.html   (614 words)

  
 Cloud photographs by Dave Parker (FRMetS)
This cloud is normally found close to a thunderstorm which is formed where air rises rapidly - but what goes up must come down (effect known as downdraught) - hence this strange formation.
The full extent of the cloud is masked but the very white part to the top of the picture shows the vertical extent of the cloud.
Cirrus is composed of ice crystals and is always white (except possibly after sunset or before sunrise).
www.invectis.co.uk /cloud/cloud.html   (1155 words)

  
 Four Years of Global Cirrus Cloud Statistics Using HIRS
Cirrus clouds are crucially important to global radiative processes and the thermal balance of the Earth; they allow solar heating while reducing infrared radiation cooling to space.
Cirrus clouds often appear warmer in the infrared window band than the ambient air temperature at their altitude because they are transmitting radiation from below.
The frequent occurrence of high clouds in the ITCZ is prominent as the central maximum; the mid-latitude storm belts are evident in the secondary maxima.
www.ssec.wisc.edu /~donw/PAGE/PAPER1/GH4YRHTM.TXT   (8335 words)

  
 Cirrus and Altostratus Clouds
Prior to this review period, it was felt that the simulation of cirrus cloud feedback on climate was both premature and limited by our lack of understanding of the relationship between size and shape of ice crystals and the gross radiative properties of cirrus (Stephens et al.
Gultepe and Rao [1993] calculated the moisture and heat budgets of a cirrus cloud from aircraft measurements during FIRE and showed that the maintenance of cirrus can be attributed to relatively warm and moist advection, radiative cooling at upper levels, and moisture advection in the vertical.
The effect of volcanic aerosol on cirrus cloud microphysics and radiative transfer was discussed by Sassen [1992] and Jensen and Toon [1992].
www.agu.org /revgeophys/rasmus00/node21.html   (775 words)

  
 Cirrus cloud - Wikipedia, the free encyclopedia
Strange cirrus clouds have been observed to develop after the irroration of chemical trails from white aircraft.
The effects of this fake condensation trails on cirrus cloud enhancement is an increasingly prominent part of the discussion about Chemtrail.
Cirrus and chemtrail Cirrus (- Smog, see: Chemtrail) filter the sunlight, thus altering the quality and diminishing the quantity of the Sun's radiation that reaches the surface of Earth.
en.wikipedia.org /wiki/Cirrus_cloud   (511 words)

  
 Cirrus Cloud Visible Optical Properties   (Site not responding. Last check: 2007-10-17)
Examination of the cirrus cloud structure has shown the advantages of a volume scanning system and the difficulties encountered by a vertically pointing instrument when attempting to describe the cirrus cloud spatial structure across a mesoscale volume.
To understand the effects of cirrus clouds on the Earth's radiative budget, the cirrus cloud optical properties have to be known.
The cirrus cloud visible aerosol backscatter cross sections calculated from the HSRL data are used to calibrate the VIL backscattered signal.
lidar.ssec.wisc.edu /papers/ww_thes/node14.htm   (485 words)

  
 Laboratory studies of cirrus cloud processes
Where cirrus clouds have been present in the upper troposphere, aerosols are collected, modified by chemical reactions on ice crystals, and redistributed through sedimentation to lower levels.
This jump from a discussion primarily of nucleation rates to one of freezing conditions is done to simplify and conceptualize the implications for cirrus cloud formation and to enable comparison of varied experimental techniques.
It is apparent that these conditions for the formation of ice in continental cirrus clouds are not satisfied by assuming that cirrus haze particles are composed of sulfuric acid that freezes by homogeneous nucleation.
lamar.colostate.edu /~pdemott/cirrus/book.html   (7997 words)

  
 Demonstration 9b... Painting a Cirrus cloud
Cirrus are high altitude clouds composed of ice crystals.
Cirrus clouds are thin and transluscent, therefore they are painted after the sky is completed.
The mixture used for these clouds was white and dioxazine purple.
www.davidadamsonline.com /cirrus.htm   (124 words)

  
 List of cloud types - Wikipedia, the free encyclopedia
The clouds tend to be wispy, and are often transparent.
Cirrus clouds whose filaments are irregularly curved or tangled.
Abbreviation: St Stratus clouds are layerlike clouds associated with widespread precipitation or ocean air, and often produce drizzle.
en.wikipedia.org /wiki/Cloud_types   (1285 words)

  
 Pets > Photo Album > Cirrus Cloud
Cirrus meets Whitney: Cirrus was introduced to Whitney shortly after her arrival.
Cirrus Cloud, nature lover: Cirrus takes a moment to survey the back yard from behind a screen door one day in mid-March.
Cirrus meets Aurora: Cirrus says hi to her new pal, Aurora Sunflower, not long after she arrived at our home.
www.grafs.net /site/netaxs.com/photo_albums/pets/photo_cirrus.html   (177 words)

  
 Energy Citations Database (ECD) - Energy and Energy-Related Bibliographic Citations   (Site not responding. Last check: 2007-10-17)
Trends in global upper-tropospheric transmissive cirrus cloud cover are beginning to emerge from a four-year cloud climatology using NOAA polar-orbiting High-Resolution Infrared Radiation Sounder (HIRS) multispectral data.
Cloud occurrence, height, and effective emissivity are determined with the CO2 slicing technique on the four years of data (June 1989-May 1993).
Cirrus observations increase from 35% to 43% of the data, a change of eight percentage points.
www.osti.gov /energycitations/product.biblio.jsp?osti_id=53425   (414 words)

  
 Clouds   (Site not responding. Last check: 2007-10-17)
Clouds are made of small droplets of water or bits of ice that are spread out from each other.
Even in the summer, cirrus clouds are made of ice because it is cold high above Earth.
All cloud photos are from the University of Illinois Cloud Catalog.
vathena.arc.nasa.gov /curric/weather/pricloud/index.html   (274 words)

  
 Amazon.com: Cirrus: Books: David K. Lynch,Kenneth Sassen,David O'C. Starr,Graeme Stephens   (Site not responding. Last check: 2007-10-17)
The twenty-one chapters provide a technical survey of cirrus clouds, and is intended to fill the large gap between elementary treatments of cirrus and advanced forefront research papers.
A sampling of topics includes the history and definition of cirrus, ice crystals in cirrus, satellite remote sensing, ground-based remote sensing, contrail cirrus, subvisual cirrus, and cirrus, climate and global change.
Contemporary studies have shown that these clouds can have an effect on climate change, and the book explores this subject, focusing on the interrelationships of cirrus clouds with the global radiation budget and remote sensing systems.
www.amazon.com /Cirrus-David-K-Lynch/dp/0195130723   (951 words)

  
 Measurements of Trace Gases and Cirrus Cloud Particles in the Subtropical Upper Troposphere and Lower Stratosphere ...
HNO3 uptake: The redistribution of HNO3 via uptake and sedimentation by cirrus cloud particles is considered an important term in the upper tropospheric budget of reactive nitrogen.
Numerous cirrus cloud encounters by the NASA WB-57F high-altitude research aircraft during CRYSTAL-FACE were accompanied by the observation of condensed-phase HNO3 with the NOAA two-channel chemical ionization mass spectrometer.
Subtropical cirrus clouds, as indicated by the presence of ice particles, were observed coincident with condensed-phase HNO3 at temperatures of 197 K - 224 K and pressures of 120 hPa - 224 hPa.
cires.colorado.edu /science/projects/aoms-faheyD01.html   (524 words)

  
 The Cirrus Cloud   (Site not responding. Last check: 2007-10-17)
The typical height for a cirrus cloud is 20,000 feet or more.
Cirrus clouds can form from almost any cloud that has undergone glaciation (to turn to ice) and can be observed in a very wide variety of shapes and sizes.
Cirrus streaks may be straight, shaped like a comma, or seemingly all tangeled toghether.
www.thehudsonschool.org /students/webpages/kikacir.html   (137 words)

  
 THE CIRRUS CLOUD FORECASTING PROBLEM
cirrocumulus, and anvil cirrus clouds are of this type.
the  cirrus  cloud  arrival  is  delayed  and  the  clouds  are
of most cirrus clouds are at or below the tropopause.
www.tpub.com /content/aerographer/14010/css/14010_74.htm   (423 words)

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