Weather Alert in Arizona
Air Quality Alert issued July 1 at 11:32AM MST by NWS Tucson AZ
AREAS AFFECTED: Tucson Metro Area including Tucson/Green Valley/Marana/Vail
DESCRIPTION: The Pima County Department of Environmental Quality (PDEQ) has issued a Dust Action Day for the Tucson Metro area until 8 PM MST this evening. An episode of strong and gusty winds is forecast to generate widespread blowing dust that may result in local PM- 10 concentrations that pose a health risk. Adverse health effects increase as air quality deteriorates. Coarse particulate matter - also known as PM-10 - is an air pollutant that can aggravate heart and lung disease conditions, especially in older adults, children, and those with asthma. A decrease in outdoor physical activity is recommended. Consolidate your travel, stabilize loose soils, slow down or avoid travel on dirt roads, reduce or eliminate fireplace use, and avoid using gas-powered lawn equipment. For details on this Action Day, visit the PDEQ website at www.pima.gov/deq or call 520-724-6885.
INSTRUCTION: N/A
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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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