Weather Alert in Texas
Special Weather Statement issued May 20 at 4:18AM CDT by NWS Brownsville TX
AREAS AFFECTED: Brooks; Inland Kenedy; Starr; Southern Hidalgo; Inland Willacy; Inland Cameron; Northern Hidalgo
DESCRIPTION: The combination of well-above normal temperatures and increased humidity values will produce Heat Index values up to 110 degrees for a few hours this afternoon across portions of Starr, Hidalgo, Brooks, Willacy, Cameron and Kenedy counties. A few locations, especially along the Rio Grande in Starr and Hidalgo counties, may briefly experience Heat Index values up to 112 degrees mid- afternoon. Remember to drink plenty of water, wear lightweight and light- colored clothing, and take frequent breaks from the heat. Children and pets should never be left unattended in vehicles.
INSTRUCTION: N/A
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Weather Topic: What is Rain?
Home - Education - Precipitation - Rain
Next Topic: Shelf Clouds
Precipitation in the form of water droplets is called rain.
Rain generally has a tendency to fall with less intensity over a greater period
of time, and when rainfall is more severe it is usually less sustained.
Rain is the most common form of precipitation and happens with greater frequency
depending on the season and regional influences. Cities have been shown to have
an observable effect on rainfall, due to an effect called the urban heat island.
Compared to upwind, monthly rainfall between twenty and forty miles downwind of
cities is 30% greater.
Next Topic: Shelf Clouds
Weather Topic: What is Sleet?
Home - Education - Precipitation - Sleet
Next Topic: Snow
Sleet is a form of precipitation in which small ice pellets are the primary
components. These ice pellets are smaller and more translucent than hailstones,
and harder than graupel. Sleet is caused by specific atmospheric conditions and
therefore typically doesn't last for extended periods of time.
The condition which leads to sleet formation requires a warmer body of air to be
wedged in between two sub-freezing bodies of air. When snow falls through a warmer
layer of air it melts, and as it falls through the next sub-freezing body of air
it freezes again, forming ice pellets known as sleet. In some cases, water
droplets don't have time to freeze before reaching the surface and the result is
freezing rain.
Next Topic: Snow
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