Weather Alert in Arizona

Current Alerts for Phoenix Sky Harbor International Airport, AZ: Air Quality Alert

Flash Flood Warning issued July 3 at 2:45PM MST until July 3 at 4:45PM MST by NWS Tucson AZ

AREAS AFFECTED: Pima, AZ

DESCRIPTION: FFWTWC The National Weather Service in Tucson has issued a * Flash Flood Warning for... Northeastern Pima County in southeastern Arizona... * Until 445 PM MST. * At 245 PM MST, Doppler radar indicated thunderstorms across the northern portions of the Tucson metro Area producing between 0.75 and 1.25 inches of rainfall along and near River Road near 1st Avenue. Flash flooding was being reported by National Weather Service employees in this area. HAZARD...Life threatening flash flooding. Thunderstorms producing flash flooding. SOURCE...Radar indicated. IMPACT...Life threatening flash flooding of creeks and streams, urban areas, highways, streets and underpasses. * Some locations that will experience flash flooding include... Tucson, Casas Adobes, Flowing Wells and Catalina Foothills. This includes Route 77 between mile markers 70 and 74. This includes the following Flash Flood Prone Locations... 1st Ave north of Fort Lowell Rd.

INSTRUCTION: Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles.

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Weather Topic: What are Wall Clouds?

Home - Education - Cloud Types - Wall Clouds

Wall Clouds Next Topic: Altocumulus Clouds

A wall cloud forms underneath the base of a cumulonimbus cloud, and can be a hotbed for deadly tornadoes.

Wall clouds are formed by air flowing into the cumulonimbus clouds, which can result in the wall cloud descending from the base of the cumulonimbus cloud, or rising fractus clouds which join to the base of the storm cloud as the wall cloud takes shape.

Wall clouds can be very large, and in the Northern Hemisphere they generally form at the southern edge of cumulonimbus clouds.

Next Topic: Altocumulus Clouds

Weather Topic: What are Altostratus Clouds?

Home - Education - Cloud Types - Altostratus Clouds

Altostratus Clouds Next Topic: Cirrocumulus Clouds

Altostratus clouds form at mid to high-level altitudes (between 2 and 7 km) and are created by a warm, stable air mass which causes water vapor to condense as it rise through the atmosphere. Usually altostratus clouds are featureless sheets characterized by a uniform color.

In some cases, wind punching through the cloud formation may give it a waved appearance, called altostratus undulatus. Altostratus clouds are commonly seen with other cloud formations accompanying them.

Next Topic: Cirrocumulus Clouds

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