Weather Alerts for Pennsylvania

Recent Locations: Avon, IL Argyle, GA Erwinna, PA

1. Air Quality Alert for: Dauphin; Lebanon; Cumberland; York; Lancaster

2. Extreme Cold Warning for: Carbon; Monroe

3. Extreme Cold Warning for: Clearfield; Northern Centre; Southern Centre; Cambria; Blair; Somerset; Bedford

4. Extreme Cold Warning for: Huntingdon; Fulton

5. Extreme Cold Warning for: Mercer; Venango; Forest; Butler; Clarion; Jefferson; Armstrong; Westmoreland Ridges; Fayette Ridges; Indiana; Higher Elevations of Indiana; Eastern Preston

6. Extreme Cold Warning for: Mifflin; Juniata; Franklin; Union; Snyder; Montour; Northumberland; Columbia; Perry; Dauphin; Schuylkill; Lebanon; Cumberland; Adams; York; Lancaster

7. Extreme Cold Warning for: Northern Clinton; Northern Lycoming; Sullivan; Southern Clinton; Southern Lycoming

8. Extreme Cold Warning for: Northern Erie; Southern Erie; Crawford

9. Extreme Cold Warning for: Warren; McKean; Potter; Elk; Cameron; Tioga

10. Extreme Cold Warning for: Wyoming; Lackawanna; Luzerne

11. Wind Advisory for: Carbon; Monroe

12. Wind Advisory for: Clearfield; Northern Centre; Southern Centre; Cambria; Blair; Somerset; Bedford

13. Wind Advisory for: Huntingdon; Fulton

14. Wind Advisory for: Mifflin; Juniata; Franklin; Union; Snyder; Montour; Northumberland; Columbia; Perry; Dauphin; Schuylkill; Lebanon; Cumberland; Adams; York; Lancaster

15. Wind Advisory for: Northern Clinton; Northern Lycoming; Sullivan; Southern Clinton; Southern Lycoming

16. Winter Weather Advisory for: Cambria; Somerset

17. Winter Weather Advisory for: Northern Erie; Southern Erie; Crawford

18. Winter Weather Advisory for: Westmoreland Ridges; Fayette Ridges; Higher Elevations of Indiana; Ridges of Eastern Monongalia and Northwestern Preston; Preston

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Current U.S. National Radar--Current

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National Weather Forecast--Current

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National Weather Forecast for Tomorrow

Tomorrow National Weather Forecast and Tomorrow National Weather Map are show below.

North America Water Vapor (Moisture)

This map shows recent moisture content over North America. Bright and colored areas show high moisture (ie, clouds); brown indicates very little moisture present; black indicates no moisture.

Weather Topic: What is Condensation?

Home - Education - Precipitation - Condensation

Next Topic: Contrails

Condensation is the process which creates clouds, and therefore it is a crucial process in the water cycle. Condensation is the change of matter from a state of gas into a state of liquid, and it happens because water molecules release heat into the atmosphere and become organized into a more closely packed structure, what we might see as water droplets.

Water is always present in the air around us as a vapor, but it's too small for us to see. When water undergoes the process of condensation it becomes organized into visible water droplets. You've probably seen condensation happen before on the surface of a cold drink!

Next Topic: Contrails

Weather Topic: What are Cumulonimbus Clouds?

Home - Education - Cloud Types - Cumulonimbus Clouds

Cumulonimbus Clouds Next Topic: Cumulus Clouds

The final form taken by a growing cumulus cloud is the cumulonimbus cloud, which is very tall and dense. The tower of a cumulonimbus cloud can soar 23 km into the atmosphere, although most commonly they stop growing at an altitude of 6 km.

Even small cumulonimbus clouds appear very large in comparison to other cloud types. They can signal the approach of stormy weather, such as thunderstorms or blizzards.

Next Topic: Cumulus Clouds