Forecast Details for McAllen, TX

Recent Locations: Pasadena, TX   Elizabeth, NJ   McAllen, TX  
Overnight: Patchy fog after 5am. Otherwise, mostly cloudy, with a low around 78. Light southeast wind.
Sunday: Mostly cloudy, then gradually becoming sunny, with a high near 98. Heat index values as high as 105. Calm wind becoming east 5 to 9 mph in the afternoon.
Sunday Night: Increasing clouds, with a low around 79. East wind 6 to 13 mph, with gusts as high as 21 mph.
Monday: Mostly sunny and hot, with a high near 100. Heat index values as high as 110. Southeast wind 6 to 10 mph.
Monday Night: Partly cloudy, with a low around 80. Southeast wind 10 to 14 mph, with gusts as high as 23 mph.
Tuesday: Mostly sunny, with a high near 99. Southeast wind 10 to 15 mph, with gusts as high as 26 mph.
Tuesday Night: Mostly cloudy, with a low around 80. Southeast wind around 15 mph, with gusts as high as 28 mph.
Wednesday: Mostly sunny, with a high near 99. Southeast wind 13 to 16 mph, with gusts as high as 29 mph.
Wednesday Night: Partly cloudy, with a low around 80. Southeast wind 13 to 16 mph, with gusts as high as 28 mph.
Thursday: Sunny, with a high near 98. Southeast wind 11 to 16 mph, with gusts as high as 28 mph.
Thursday Night: Mostly clear, with a low around 81. Southeast wind 13 to 15 mph, with gusts as high as 28 mph.
Friday: Sunny and hot, with a high near 100.
Friday Night: Mostly clear, with a low around 81.
Saturday: Sunny and hot, with a high near 102.

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Current U.S. National Radar--Current

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Current U.S. National Radar

National Weather Forecast--Current

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Today's National Weather Map

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North America Water Vapor (Moisture)

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Weather Topic: What are Mammatus Clouds?

Home - Education - Cloud Types - Mammatus Clouds

Mammatus Clouds Next Topic: Nimbostratus Clouds

A mammatus cloud is a cloud with a unique feature which resembles a web of pouches hanging along the base of the cloud.

In the United States, mammatus clouds tend to form in the warmer months, commonly in the Midwest and eastern regions.

While they usually form at the bottom of a cumulonimbis cloud, they can also form under altostratus, altocumulus, stratocumulus, and cirrus clouds. Mammatus clouds warn that severe weather is close.

Next Topic: Nimbostratus Clouds

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