Weather Alert in Colorado

Recent Locations: Denver, CO  

Air Quality Alert issued July 26 at 10:10AM MDT by NWS Grand Junction CO

AREAS AFFECTED: Mesa, CO

DESCRIPTION: The Colorado Department of Public Health and Environment has issued the following... WHAT...Air Quality Health Advisory for Wildfire Smoke. WHERE...Mesa County. Locations include, but are not limited to Gateway and Grand Junction. WHEN...900 AM Saturday July 26 to 900 AM Sunday July 27 IMPACTS...Smoke will continue to affect the advisory area on Saturday and Sunday. Heavy smoke is expected in areas in close proximity to the Turner Gulch Fire in southern Mesa County, including Gateway and along Highway 141 in southern Mesa County. Moderate smoke impacts are anticipated on Saturday morning in other areas of Mesa County, however an increase in fire behavior and smoke production from fires within Colorado and in other states is expected to increase concentrations across the advisory area starting Saturday afternoon, including in Grand Junction. HEALTH INFORMATION...Public Health Recommendations: If smoke is thick or becomes thick in your neighborhood you may want to remain indoors. This is especially true for those with heart disease, respiratory illnesses, the very young, and older adults. Consider limiting outdoor activity when moderate to heavy smoke is present. Consider relocating temporarily if smoke is present indoors and is making you ill. If visibility is less than 5 miles in smoke in your neighborhood, smoke has reached levels that are unhealthy.

INSTRUCTION: N/A

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Weather Topic: What is Precipitation?

Home - Education - Precipitation - 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

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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