What is an isobar?

An isobar is a line of constant pressure. These lines are often measured in 2, 4, or 10 millibar increments.

When you see lots of isobars over an area, most likely that area is experiencing lots of wind (due to the difference in air pressure).

» More Homework Help Questions

Interactive Radars

Regional Headlines

This Week's Circulars


Regional Radar Image

 The Accuweather Channel Forecast

Live Traffic Cameras

Cameras provided by PennDOT

Historical Averages

High Low
Current 35°F 28°F
Average 50°F 30°F
Record 86°F March 20, 1945 6°F March 20, 1949