Weather Alerts for Pennsylvania

Recent Locations: Towaco, NJ Newhall, CA Cherryville, 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. Special Weather Statement for: Cambria; Somerset; Bedford

12. Wind Advisory for: Carbon; Monroe

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

14. Wind Advisory for: Huntingdon; Fulton

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

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

17. Winter Weather Advisory for: Cambria; Somerset

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

19. 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

The Current National Weather Radar is shown below with a UTC Time (subtract 5 hours from UTC to get Eastern Time).

National Weather Forecast--Current

The Current National Weather Forecast and National Weather Map are shown below.

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 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

Weather Topic: What is Drizzle?

Home - Education - Precipitation - Drizzle

Drizzle Next Topic: Evaporation

Drizzle is precipitation in the form of water droplets which are smaller than raindrops.

Drizzle is characterized by fine, gently falling droplets and typically does not impact human habitation in a negative way. The exception to this is freezing drizzle, a condition where drizzle freezes immediately upon reaching earth's surface. Freezing drizzle is still less dangerous than freezing rain, but can potentially result in hazardous road conditions.

Next Topic: Evaporation