Definitions 1
a boundary that separates air masses with different characteristics
weather front
the smallest unit of a storm-producing system
storm cell
In the collision-coalescense process, the size of a water drop __________ due in collisions with other water drops.
increases
_____________ __________ is made when rain falls and freezes the moment it hits the ground.
Freezing rain
For the same temperature, water evaporates ___________ when the relative humidity is lower.
faster
the amount of water vapor in the air as a percentage of its saturation level
relative humidity
the mass of water vapor found in a given volume of air
absolute humidity
Freezing rain must be liquid until it reaches the ground. If it freezes before hitting the ground, is it ___________.
sleet
Which forms on a sunny day? hurricane, supercell, dust devil, or tropical disturbance
dust devil
On a weather map, semicircles indicate a _____________ ______________.
warm front
completely full of a substance so that no more can be accepted
saturated
What do we call the precipitation that is produced when ice crystals fall from a cloud and then pass through warm air where they melt? (not in definitions)
rain
When a cold front moves into a mass of warm air, the ___________ ___________ rises over the ____________ _____________.
warm air; cold front
The formation of cirrus clouds, followed by the formation of stratus clouds, indicates a ___________ ___________ is moving in.
warm front
On a weather map, triangles represent a ________ __________.
cold front
a measure of how strongly molecules of a substance are attracted to one another
cohesion
a variation in wind velocity that tends to produce a rotating motion in the air
wind shear
A hurricane's winds can _______________ in speed when it travels over warm water, and they ________________ in speed when the hurricane encounters land.
increase; decrease
_________________ clouds are produced by supercells before a tornado.
Funnel
On a weather map, semicircles and triangles represent this type of front.
occluded
an organized system of thunderclouds that rotate over warm ocean waters
tropical cyclone
a rotating air mass at the center of a supercell
mesocyclone
In the towering cumulus stage of a thunderstorm, winds blow __________ in the cloud. In the dissipation stage, they blow __________ in the cloud.
upward; downward
____________ _____________ can refer to a hurricane, typhoon, or cyclone.
Tropical cyclone
__________ is formed from ice crystals that are made in clouds. ________ is formed by rain that freezes when it leaves the cloud.
Snow; sleet