Weather Alert in Colorado
Air Quality Alert issued July 17 at 5:10PM MDT by NWS Grand Junction CO
AREAS AFFECTED: Mesa, CO; Delta, CO; Montrose, CO
DESCRIPTION: The Colorado Department of Public Health and Environment has issued the following... WHAT...Air Quality Health Advisory for Wildfire Smoke. WHERE...Mesa, Delta and Montrose Counties. Locations include, but are not limited to Grand Junction, Delta, Montrose and Nucla. WHEN...900 AM Thursday July 17 to 900 AM Friday July 18 IMPACTS...Multiple wildfires will produce periods of moderate to heavy smoke across the advisory area through early Friday morning. The heaviest smoke impacts are expected in locations near the fires. Thunderstorms are possible on Thursday, which may produce gusty, erratic winds that can send smoke in any direction. HEALTH INFORMATION...Public Health Recommendations: Increasing likelihood of respiratory symptoms in sensitive individuals, aggravation of heart or lung disease and premature mortality in people with cardiopulmonary disease and older adults. People with heart or lung disease, older adults, and children should reduce prolonged or heavy exertion.
INSTRUCTION: N/A
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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
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
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