AE - Clouds and fog Flashcards
Í hvaða skýji verður til freezing rain?
Nimbostratus
Hvaða ský? “Sometimes appears in the form of ragged patches.”
Stratus
Hvenær dags myndast orographic fog?
Hvenær sem er
Hvernig myndast advection fog?
Warm moist air flows over colder surface. Loftið snöggkólnar og nær daggarmörkum.
Hvaða ský hefur þessa lýsingu? “Fibrous (hair-like) appearance, or a silky sheen, or both.”
Cirrus
Í hvaða hæð eru low level clouds?
GND - 6500ft
Í hvaða hæð er Altocumulus?
6500ft - 23000ft
Stratocumulus, hvar gæti base verið?
1500 - 7000 ft.
Hvað er frontal fog?
þegar heitt regn frá heita loftinu sem er að leggjast yfir það kalda (warm front), fellur niður í kaldara loft þar sem það þéttist og myndar frontal fog.
Which type of fog can not be formed over water?
a) radiation fog
b) frontal fog
c) advection fog
d) arctic smoke
a) radiation fog.
Radiation fog gerist þegar landið snögg kælist og loftið fyrir ofan er heitara (og þéttis og myndar þoku). Sjórinn getur ekki snögg kælst.
Hver eru vertical mörk medium- og high level clouds?
Medium 6500 - 23000ft og high level clouds eru talin byrja 16500 ft.
Hvaða fog er í raun öfugt advection fog?
steam fog (arctic smoke)
Hvernig virkar steam fog (arctic smoke)?
Cold air moving over warmer water.
Af “cumulu” skýjunum, hvað er mest stable af þeim?
Altocumulus lenticularis
Main components of the altostratus is (two things)
ice crystals and water droplets
Hvaða ský hefur þessa lýsingu “it’s upper part resembles a cauliflower” ?
Towering cumulus.
Getur munað: cauliFLOWER TOWER
Hvað getur radiation fog náð langt upp?
500ft
Hvaða ský hefur þessa lýsingu? “Low, ragged clouds frequently occur below the layer, with which they may or may not merge.”
Nimbostratus.
Cumulus clouds are an indication for __ and __ draughts.
up and down draughts.
Hversu hátt getur CB náð?
20 km
Til hvers bendir fair weather cumulus?
Turbulence
Hvað er í freezing fog?
a) supercooled water droplets
b) ice crystals
c) frozen water droplets
a) supercooled water droplets
Hvað er gott til að orographic fog myndist?
a) High relative humidity
b) absolutely unstable air
a) High relative humidity
Radiation fog occurs most frequently in high/low pressure systems over land/sea
High pressure over land.
Ímyndaðu þér bara radiation fog yfir Lúxemborg yfir sumarið þegar þessi huge High pressure svæði liggja yfir. High = Clear sky, calm winds = No mixing = kjöraðstæður fyrir radiation fog.
Can fog be supercooled and contain ice crystals?
Yes
Rétt eða rangt? Mist and haze consist of water droplets.
Rangt, mist contains water droplets but haze contains small solids particles such as smoke, dust, sand.
A layer of stratus is most likely to be dispersed by insolation resulting in the lifting of the ____ level.
condensation
Which favours the development of orographic fog?
a) Absolutely unstable air
b) high relative humdity
b) high relative humdity
Hvaða þoka finnst í coastal region of Newfoundland in spring time?
Advection fog.
What will clear orographic fog?
a) A change of the air flow
b) Katabatic wind
a) A change of the air flow
In mid-latitudes, the tops of cumulus are often limited by:
a) the tropopause
b) a temperature inversion
b) a temperature inversion
A cumulonimbus cloud at mid-latitudes in summer contains
a) ice crystals
b) water droplets
c) supercooled water droplets
everything
Which of the following statements is true concerning advection fog?
a) it forms when unstable air is adiabatically cooled.
b) it can appear suddenly by day or by night.
b) it can appear suddenly by day or by night.
Í hvaða skýji gerist “halo” effect?
a) altostratus
b) cirrostratus
b) cirrostratus
The presence of Altocumulus Castellanus indicates instability in the ___ troposphere.
middle.
Hverju cancellar þú þegar aðstæðurnar hafa breyst?
a) aerodrome warning
b) TAF
c) Trend forecast
a) aerodrome warning
A layer of stratus is most likely to be dispersed by ___ resulting in the lifting of the condensation level.
insolation.
As a result of diurnal variation, radiation fog is lifted and a cloud cover is formed. Low stratus will develop caused by increasing ___ ___.
wind speed.
