Weather Alert in Arizona
Fire Weather Watch issued May 10 at 1:08PM MST until May 13 at 8:00PM MST by NWS Tucson AZ
AREAS AFFECTED: Eastern Pima-Southeastern Pinal-Santa Cruz-Western Cochise; Southern Graham-Central and Eastern Cochise-Southern Greenlee-Lower Elevations of the San Carlos Apache Nation in Graham County; Northern Graham-Northern Greenlee-White and Gila Mountains; Mountains above 5500 feet
DESCRIPTION: The National Weather Service in Tucson has issued a Fire Weather Watch for strong and gusty winds, low relative humidity, and high fire danger, which is in effect from Monday afternoon through Monday evening. A Fire Weather Watch has also been issued from Tuesday morning through Tuesday evening. * AFFECTED AREA...Fire Weather Zones 151, 152, 153 and 154. * TIMING...For the first Fire Weather Watch, from Monday afternoon through Monday evening. For the second Fire Weather Watch, from Tuesday morning through Tuesday evening. * WINDS...Southwest 20 to 25 mph with gusts to around 45 mph. * RELATIVE HUMIDITY...As low as 7 percent. * IMPACTS...Any fires that develop or are ongoing will have the potential to spread rapidly.
INSTRUCTION: A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings. Please advise the appropriate officials or fire crews in the field of the Fire Weather Watch for portions of Southeast Arizona.
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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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