Weather Alerts for Arizona

Recent Locations: Ellisville, IL Curtis Bay, MD Taylor, AZ

1. Air Quality Alert for: Maricopa, AZ

2. Dust Advisory for: Pinal, AZ

3. Flash Flood Warning for: Coconino, AZ

4. Flash Flood Warning for: Coconino, AZ

5. Flash Flood Warning for: Coconino, AZ

6. Flash Flood Warning for: La Paz, AZ

7. Flash Flood Warning for: La Paz, AZ; Yuma, AZ

8. Flash Flood Warning for: Mohave, AZ

9. Flash Flood Warning for: Mohave, AZ

10. Flash Flood Warning for: Pima, AZ; Pinal, AZ

11. Flash Flood Warning for: Yavapai, AZ

12. Flash Flood Warning for: Yavapai, AZ

13. Flood Advisory for: Pima, AZ; Pinal, AZ

14. Flood Watch for: Aguila Valley; Northwest Valley; Tonopah Desert; Gila Bend; Buckeye/Avondale; Cave Creek/New River; Deer Valley; Central Phoenix; North Phoenix/Glendale; New River Mesa; Scottsdale/Paradise Valley; Rio Verde/Salt River; East Valley; Fountain Hills/East Mesa; South Mountain/Ahwatukee; Southeast Valley/Queen Creek; Superior; Northwest Pinal County; West Pinal County; Apache Junction/Gold Canyon; Tonto Basin; Mazatzal Mountains; Pinal/Superstition Mountains; Sonoran Desert Natl Monument; San Carlos; Dripping Springs; Globe/Miami; Southeast Gila County

15. Flood Watch for: Parker Valley; Kofa; Yuma; Central La Paz; Southeast Yuma County; Gila River Valley; Imperial County Southwest; Salton Sea; Chuckwalla Mountains; Imperial County Southeast; Imperial County West; Imperial Valley; Chiriaco Summit; Palo Verde Valley; Chuckwalla Valley

16. Flood Watch for: Upper Santa Cruz River and Altar Valleys including Nogales; Tucson Metro Area including Tucson/Green Valley/Marana/Vail; Southeast Pinal County including Kearny/Mammoth/Oracle; Upper San Pedro River Valley including Sierra Vista/Benson; Eastern Cochise County Below 5000 Feet including Douglas/Willcox; Upper Gila River and Aravaipa Valleys including Clifton/Safford; White Mountains of Graham and Greenlee Counties including Hannagan Meadow; Galiuro and Pinaleno Mountains including Mount Graham; Chiricahua Mountains including Chiricahua National Monument; Dragoon/Mule/Huachuca and Santa Rita Mountains including Bisbee/Canelo Hills/Madera Canyon; Santa Catalina and Rincon Mountains including Mount Lemmon/Summerhaven

17. Flood Watch for: Western Pima County Including Ajo/Organ Pipe Cactus National Monument; Tohono O'odham Nation including Sells; South Central Pinal County including Eloy/Picacho Peak State Park

18. Flood Watch for: Yavapai County Mountains; Northern Gila County; Yavapai County Valleys and Basins

19. Special Weather Statement for: Parker Valley; Kofa; Chuckwalla Mountains; Palo Verde Valley; Chuckwalla Valley

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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 is Precipitation?

Home - Education - Precipitation - Precipitation

Next Topic: Rain

Precipitation can refer to many different forms of water that may fall from clouds. Precipitation occurs after a cloud has become saturated to the point where its water particles are more dense than the air below the cloud.

In most cases, precipitation will reach the ground, but it is not uncommon for precipitation to evaporate before it reaches the earth's surface. When precipitation evaporates before it contacts the ground it is called Virga. Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog and mist are not considered precipitation because the water vapor which constitutes them isn't dense enough to fall to the ground.

Next Topic: Rain

Weather Topic: What are Shelf Clouds?

Home - Education - Cloud Types - Shelf Clouds

Shelf Clouds Next Topic: Sleet

A shelf cloud is similar to a wall cloud, but forms at the front of a storm cloud, instead of at the rear, where wall clouds form.

A shelf cloud is caused by a series of events set into motion by the advancing storm; first, cool air settles along the ground where precipitation has just fallen. As the cool air is brought in, the warmer air is displaced, and rises above it, because it is less dense. When the warmer air reaches the bottom of the storm cloud, it begins to cool again, and the resulting condensation is a visible shelf cloud.

Next Topic: Sleet