Dorney sworn in as new Allentown police chief - more >>


Why are clouds flat on the bottom?

In the atmosphere, cumulus clouds, or low-level clouds, begin to form at what meteorologists call the Lifted Condensation Level (LCL).

The LCL is the level at which lifted or rising water vapor condenses into a cloud droplet, hence the name.

Water will not condense below this level to form a cloud.

Generally speaking, the LCL is uniform as far as the eye can see. Therefore, the LCL determines the bottom level of clouds…thus, the flat look on the bottom of cumulus clouds.

More Homework Help Questions

Interactive Radars

Regional Headlines

This Week's Circulars

Regional Radar Image

Live Traffic Cameras

Cameras provided by PennDOT

Historical Averages

High Low
Current 62°F 47°F
Average 63°F 40°F
Record 86°F April 24, 1960 29°F April 24, 1930