Weather Alerts for Illinois

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Current Alerts for Carol Stream, IL: Severe Thunderstorm Watch

1. Flood Warning for: Adams

2. Flood Warning for: Adams

3. Flood Warning for: Adams

4. Flood Warning for: Alexander

5. Flood Warning for: Alexander; Jackson; Union

6. Flood Warning for: Alexander; Pulaski

7. Flood Warning for: Brown; Cass; Morgan; Schuyler

8. Flood Warning for: Calhoun

9. Flood Warning for: Calhoun

10. Flood Warning for: Calhoun; Greene; Jersey

11. Flood Warning for: Carroll; Jo Daviess

12. Flood Warning for: Carroll; Whiteside

13. Flood Warning for: Cass; Fulton; Mason

14. Flood Warning for: Clinton

15. Flood Warning for: Gallatin; Hardin

16. Flood Warning for: Hancock

17. Flood Warning for: Hancock; Henderson

18. Flood Warning for: Henderson

19. Flood Warning for: Henderson; Mercer

20. Flood Warning for: Jackson; Randolph

21. Flood Warning for: Jersey

22. Flood Warning for: Jo Daviess

23. Flood Warning for: Jo Daviess

24. Flood Warning for: Madison

25. Flood Warning for: Massac; Pope

26. Flood Warning for: Mercer

27. Flood Warning for: Mercer; Rock Island

28. Flood Warning for: Pike

29. Flood Warning for: Pike

30. Flood Warning for: Pike

31. Flood Warning for: Pike; Scott

32. Flood Warning for: Pulaski

33. Flood Warning for: Rock Island

34. Flood Warning for: Rock Island

35. Flood Warning for: Rock Island

36. Flood Warning for: Rock Island; Whiteside

37. Severe Thunderstorm Warning for: De Kalb; Kane; McHenry

38. Severe Thunderstorm Watch for: Boone; Cook; De Kalb; DuPage; Kane; Kendall; Lake; Lee; McHenry; Ogle; Will; Winnebago

39. Severe Thunderstorm Watch for: Carroll; Jo Daviess; Stephenson; Whiteside

40. Severe Thunderstorm Watch for: Rock Island

41. Severe Weather Statement for: Boone; Winnebago

42. Severe Weather Statement for: De Kalb; Kane; McHenry

43. Severe Weather Statement for: Ogle

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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).

Current U.S. National Radar

National Weather Forecast--Current

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

Today's National Weather Map

National Weather Forecast for Tomorrow

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

Tomorrows National Weather Map

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.

North American Water Vapor Map

Weather Topic: What are Contrails?

Home - Education - Cloud Types - Contrails

Contrails Next Topic: Cumulonimbus Clouds

A contrail is an artificial cloud, created by the passing of an aircraft.

Contrails form because water vapor in the exhaust of aircraft engines is suspended in the air under certain temperatures and humidity conditions. These contrails are called exhaust contrails.

Another type of contrail can form due to a temporary reduction in air pressure moving over the plane's surface, causing condensation. These are called aerodynamic contrails.

When you can see your breath on a cold day, it is also because of condensation. The reason contrails last longer than the condensation from your breath is because the water in contrails freezes into ice particles.

Next Topic: Cumulonimbus Clouds

Weather Topic: What are Cumulus Clouds?

Home - Education - Cloud Types - Cumulus Clouds

Cumulus Clouds Next Topic: Drizzle

Cumulus clouds are fluffy and textured with rounded tops, and may have flat bottoms. The border of a cumulus cloud is clearly defined, and can have the appearance of cotton or cauliflower.

Cumulus clouds form at low altitudes (rarely above 2 km) but can grow very tall, becoming cumulus congestus and possibly the even taller cumulonimbus clouds. When cumulus clouds become taller, they have a greater chance of producing precipitation.

Next Topic: Drizzle