Weather Alerts for Alaska

Recent Locations: Panola, TX Summit, NJ Healy, AK

Current Alerts for Healy, AK: Wind Advisory

2. Flood Advisory for: Southern Kenai Mtns; Interior Kenai Peninsula

3. Flood Advisory for: Upper Kobuk Valleys

4. Flood Advisory for: Upper Koyukuk Valley

5. Flood Warning for: Western Susitna Valley; Southern Susitna Valley; Central Susitna Valley

6. Flood Watch for: South Slopes of the Western Brooks Range; Noatak Valley; Upper Kobuk Valleys; Lower Koyukuk Valley; Upper Koyukuk Valley

7. Flood Watch for: Southern Kenai Mtns

8. Flood Watch for: Western Susitna Valley; Southern Susitna Valley; Central Susitna Valley; Northern Susitna Valley

9. Heat Advisory for: Prince of Wales Island; Ketchikan Gateway Borough; City of Hyder; Annette Island

10. Hydrologic Outlook for: Anchorage; Anchorage Hillside / Eagle River; East Turnagain Arm; Portage; Lower Matanuska Valley; Hatcher Pass; Sutton / Upper Matanuska Valley; Eureka / Tahneta Pass; Southern Kachemak Bay; SW Kenai Peninsula; NW Kenai Peninsula; Skilak Lake; Southern Kenai Mtns; Interior Kenai Peninsula; Turnagain Pass; West Prince William Sound & Whittier; Tyonek; Valdez; Thompson Pass; Cordova; Western Susitna Valley; Southern Susitna Valley; Central Susitna Valley; Northern Susitna Valley

11. Hydrologic Outlook for: Kuskokwim Valley West; Kuskokwim Valley East; Interior Kuskokwim Delta; Western Capes; Northern Bristol Bay Coast; Inland Bristol Bay

12. Hydrologic Outlook for: South Slopes Of The Central Brooks Range; South Slopes of the Western Brooks Range; Noatak Valley; Lower Kobuk Valley; Upper Kobuk Valleys; Lower Koyukuk Valley; Upper Koyukuk Valley

13. Hydrologic Outlook for: South Slopes Of The Central Brooks Range; South Slopes of the Western Brooks Range; Noatak Valley; Lower Kobuk Valley; Upper Kobuk Valleys; Lower Koyukuk Valley; Upper Koyukuk Valley

14. Special Weather Statement for: Northern Copper Valley; Western Copper Valley; Central Copper Valley; Ernestine; Southern Copper Valley

15. Special Weather Statement for: Southern Kachemak Bay; SW Kenai Peninsula; NW Kenai Peninsula

16. Wind Advisory for: Delta Junction; Eastern Alaska Range North of Trims Camp; Eastern Alaska Range South of Trims Camp

17. Wind Advisory for: Northern Denali Borough

18. Wind Advisory for: Yukon Flats; White Mountains and High Terrain South of the Yukon River; Upper Chena River Valley; Tanana Flats; Eielson AFB and Salcha; Goldstream Valley and Nenana Hills; Chatanika River Valley; Two Rivers; Fairbanks Metro Area; Nenana; Central Interior

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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

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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 Contrails?

Home - Education - Cloud Types - 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

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