Weather Alerts for Arizona
1. Blowing Dust Advisory for: Northwest Pinal County
2. Blowing Dust Advisory for: Western Pima County Including Ajo/Organ Pipe Cactus National Monument; Tohono O'odham Nation including Sells; Upper Santa Cruz River and Altar Valleys including Nogales; Tucson Metro Area including Tucson/Green Valley/Marana/Vail; South Central Pinal County including Eloy/Picacho Peak State Park; 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
3. Extreme Heat Warning for: Aguila Valley; Tonopah Desert; Gila Bend; Cave Creek/New River; Fountain Hills/East Mesa; West Pinal County; Apache Junction/Gold Canyon; Sonoran Desert Natl Monument
4. Extreme Heat Warning for: Grand Canyon Country
5. Extreme Heat Warning for: Lake Havasu and Fort Mohave; Northwest Deserts; Death Valley National Park; Western Mojave Desert; Morongo Basin; Cadiz Basin; San Bernardino County-Upper Colorado River Valley; Western Clark and Southern Nye County
6. Extreme Heat Warning for: Lake Mead National Recreation Area; Eastern Mojave Desert, Including the Mojave National Preserve; Northeast Clark County; Las Vegas Valley; Lake Mead National Recreation Area; Southern Clark County
7. Extreme Heat Warning for: Marble and Glen Canyons
8. Extreme Heat Warning for: Northwest Pinal County
9. Extreme Heat Warning for: Northwest Valley; Buckeye/Avondale; Deer Valley; Central Phoenix; North Phoenix/Glendale; Scottsdale/Paradise Valley; East Valley; South Mountain/Ahwatukee; Southeast Valley/Queen Creek
10. Extreme Heat Warning for: Parker Valley; Yuma; Imperial County Southwest; Salton Sea; Imperial County West; Imperial Valley; Palo Verde Valley; Chuckwalla Valley
11. Heat Advisory for: Northwest Plateau; Owens Valley; Esmeralda and Central Nye County; Lincoln County; Sheep Range; Spring Mountains-Red Rock Canyon
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North America Water Vapor (Moisture)
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Weather Topic: What are Wall Clouds?
Home - Education - Cloud Types - 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
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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