Cap 8 Stability And Cloud Formation Flashcards
Initial causes of vertical motion ?
Convection Orographic lift Friction layer wind Low level convergence Frontal lift
ELR LAPSE RATE IN ISA CONDITION?
1.98 C/1000FT
BUT IT RANGES BETWEEN 0.6 AND 4 DEGREES C/1000FT
What happens to the latent heat from ice to water vapour? And vice versa?
From ice to water vapour > latent heat is absorbs
From water vapour to ice> latent heat is release
Describe the process of cooling DALR and SALR related to ELR?
Air parcel at the beginning cools at 3c/1000ft (higher cooling) ,once it reaches the saturation point (100% humidity) starts to cool at 1.8 c/1000ft (slower cooling due to latent heat released) and then if the air parcel doesn’t have enough water vapour to release latent heat ,it changes back to 3c /1000ft cooling rate
What are the conditions for absolute stability in terms of lapse rate?CLOUDS IT FORMS,precipitation,ice type,visibility?
DALR>SALR> ELR
3C>1.8> (ANYTHING LESS THEN 1.8)
DALR»>COLDEST AIR IN RESPECT TO THE SOROUNDING
SALR»>LESS COLD AIR IN RESPECT TO THE SURROUNDING
ELR»> WARM AIR IN RESPECT TO THE SURROUNDING
FORM STRATUS CLOUDS ,NIMBOSTRATUS OR ALTOSTRATUS DRIZZLE CONTINUOUSLY RIME ICE Visibilty poor INVERSION AT TOP
WHAT ARE THE CONDITIONS FOR UNSTABLIITY IN TERMS OF LAPSE RATE?
Turbulence yes or no?Microburst yes or no?hail Yes or no?
SIZE OF WATER DROPLETS?
Type of ice?
Clouds ?
ELR>DALR>SALR
ANYTHING GREATER THAN 3C >3C> 1.8C
ELR»»COLDEST AIR IN RESPECT TO THE SURROUNDING
DALR»>LESS COLD AIR RESPECT TO THE SURROUNDING
SALR»>WARM AIR IN RESPECT TO THE SURROUNDING
Turbulence YES Bigger water droplets Microburst YES Hail YES Clear,rime and mixed ice Cumulonimbus,cumulus,towering cumulus,stratocumulus,altocumulus
WHAT ARE THE CONDITIONS FOR CONDITIONAL UNSTABLY?
DALR>ELR>SALR
3C>ANYHTING BETWEEN 3 AND 1.8 C > 1.8C
DALR»>COLDEST AIR
ELR»»LESS COLD AIR
SALR»>WARM AIR
