EOSC 114 Module 6 Exam Questions and Answers Already Passed
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Module
EOSC 114 Module 6
Institution
EOSC 114 Module 6
EOSC 114 Module 6 Exam Questions and Answers Already Passed
Thunderstorm cloud type - Answers Cumulonimbus clouds - lightning and thunder
strong updrafts, cloud base near ground and cloud top near troposphere
What ways do thunderstorms typically move - Answers SW --> NE
Mammatus clouds - An...
EOSC 114 Module 6 Exam Questions and Answers Already Passed
Thunderstorm cloud type - Answers Cumulonimbus clouds - lightning and thunder
strong updrafts, cloud base near ground and cloud top near troposphere
What ways do thunderstorms typically move - Answers SW --> NE
Mammatus clouds - Answers sometimes visible on underside of anvil clouds, beautiful but no clue of
intensity of storms
Saturation - Answers max amount of water vapour that air can carry at equilibrium - important for
determining whether condensation occurs and latent heat is released into the thunderstorm
Gas pressures - Answers gas molecules hit surfaces and exert pressure - force per unit area - pressure
inserted by each gas is partial pressure - sum to give total pressure (P)
the symbol for water vapours partial pressure is 'e'
Mixing ratio - Answers ratio of mass (kg) of water vapour in that mixture, divided by mass (Kg) of all the
other gases -> symbol r
typically varies between 0-0.04kg water vapour/kg air
typically between 0.004 and 0.015
never negative
Relative Humidity - Answers Tells us how much water vapour is in the air, compared to the max amount
that could be held - reported as percentage
Dew Point Temperature - Answers cool air at constant pressure till water begins to condense out, that's
the dew point temperature
for saturated, it's just the temp it's at
dew point depression - diff between air temp and dew point temp
Stratiform Clouds characteristics - Answers layered, large horizontal extent (10s to 1000s of kms) -
relatively thin (0.01-1km)
-Formed by mostly smooth, horizontal winds, named by their altitude
-Cloud base is not related to lifting condensation level (LCL) for these clouds
Stratiform cloud examples - Answers -cirrus, cirrostratus, cirrocumulus (high altitude 10km) thin and
made of ice crystals
-Alostratus, altocumulus - medium altitudes, 5km , made of water droplets
, -Stratus, nimbostratus - low bases (0.1-2km) thick with widespread drizzle from the nimbostratus
Cumuliform clouds characteristics - Answers look like popcorn, cotton balls, or cauliflower, significant
vertical motion and turbulence and are often formed by air parcels rising from near the ground under
the cloud
-flat bases, at altitudes near theoretical LCL
- often diameter is roughly equal to thickness
cumuliform cloud examples - Answers named by size
-Cumulus humilis - fair weather clouds, 1km in size
-Cumulus mediocris - medium, 4km size
-Cumulus congestus - towering, 7km
Cumulonimbus - thunderstorms - 11km with precipitation
Thunderstorm Cells
stages - Answers each has a lifecycle 5-15 min
stage 1 - cumulus phase - all updraft, no precipitation, no anvil
stage 2 - mature stage - both up and down drafts (can be violent), precipitation, start of anvil with sharp
or crisp outline
stage 3 - dissipating stage - only downdrafts, weaker precipitation, large anvil with diffuse outline
stage 4 - cold gust-front air plows under warmer humid boundary layer air - triggers updraft that can
spawn new daughter thunderstorm = storm propagation
orographic thunderstorms - Answers stay anchored over mountains for long time due to favorable wind
shear that continually feeds storm with more fuel from boundary layer
can cause dangerous flash floods that rush down mountain canyons
Multicell storms - Answers many cells, most common type
diff cells are in diff stages of life cycles
flanking line of clouds sticking out from main updraft - new cells, as they grow, prevailing winds blow
these into main updraft
Squall lines - Answers heaviest rain cells merge in long narrow line
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