Weather Alert in Arizona
Flood Watch issued September 4 at 12:49AM MST until September 4 at 11:00PM MST by NWS Flagstaff AZ
AREAS AFFECTED: Yavapai County Mountains; Northern Gila County; Yavapai County Valleys and Basins
DESCRIPTION: * WHAT...Flooding caused by excessive rainfall is possible. * WHERE...Portions of east central and west central Arizona, including the following areas, in east central Arizona, Northern Gila County. In west central Arizona, Yavapai County Mountains and Yavapai County Valleys and Basins. * WHEN...From 11 AM MST this morning through this evening. * IMPACTS...Flooding will be possible in creeks, normally dry washes, and swimming holes. Low-water crossings could also become flooded, which would create deadly travel conditions. Low-water crossings may be flooded. * ADDITIONAL DETAILS... - Tropical moisture will enhance localized flooding concerns from potential heavy rainfall. - Additional information is available at weather.gov/flagstaff.
INSTRUCTION: You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.
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Weather Topic: What are Shelf Clouds?
Home - Education - Cloud Types - 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
Weather Topic: What is Snow?
Home - Education - Precipitation - Snow
Next Topic: Stratocumulus Clouds
Snow is precipitation taking the form of ice crystals. Each ice crystal, or snowflake,
has unique characteristics, but all of them grow in a hexagonal structure.
Snowfall can last for sustained periods of time and result in significant buildup
of snow on the ground.
On the earth's surface, snow starts out light and powdery, but as it begins to melt
it tends to become more granular, producing small bits of ice which have the consistency of
sand. After several cycles of melting and freezing, snow can become very dense
and ice-like, commonly known as snow pack.
Next Topic: Stratocumulus Clouds
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