Forecast Details for McAllen, TX

Recent Locations: Sunnyvale, CA Santa Clara, CA McAllen, TX

Overnight: Mostly cloudy, with a low around 74. South southeast wind around 10 mph, with gusts as high as 21 mph.

Thursday: Mostly sunny, with a high near 92. Southeast wind 9 to 14 mph, with gusts as high as 25 mph.

Thursday Night: Partly cloudy, with a low around 74. Southeast wind 11 to 14 mph, with gusts as high as 26 mph.

Friday: Partly sunny, with a high near 91. Breezy, with a south southeast wind 11 to 18 mph, with gusts as high as 32 mph.

Friday Night: Mostly cloudy, with a low around 74. Southeast wind 14 to 16 mph, with gusts as high as 30 mph.

Saturday: Mostly cloudy, with a high near 92. South southeast wind around 14 mph, with gusts as high as 26 mph.

Saturday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 66. East southeast wind 7 to 11 mph becoming north northeast after midnight. Winds could gust as high as 22 mph. Chance of precipitation is 60%.

Sunday: Showers and possibly a thunderstorm. High near 73. North wind 11 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 80%.

Sunday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Cloudy, with a low around 66. Northeast wind 6 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%.

Monday: A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 79. North northwest wind 6 to 10 mph becoming southeast in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 40%.

Monday Night: A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 69. East southeast wind 6 to 10 mph.

Tuesday: Mostly cloudy, with a high near 84.

Tuesday Night: Mostly cloudy, with a low around 70.

Wednesday: Partly sunny, with a high near 87.

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Current U.S. National Radar--Current

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National Weather Forecast--Current

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National Weather Forecast for Tomorrow

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North America Water Vapor (Moisture)

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Weather Topic: What is Condensation?

Home - Education - Precipitation - Condensation

Next Topic: Contrails

Condensation is the process which creates clouds, and therefore it is a crucial process in the water cycle. Condensation is the change of matter from a state of gas into a state of liquid, and it happens because water molecules release heat into the atmosphere and become organized into a more closely packed structure, what we might see as water droplets.

Water is always present in the air around us as a vapor, but it's too small for us to see. When water undergoes the process of condensation it becomes organized into visible water droplets. You've probably seen condensation happen before on the surface of a cold drink!

Next Topic: Contrails

Weather Topic: What are Cumulonimbus Clouds?

Home - Education - Cloud Types - Cumulonimbus Clouds

Cumulonimbus Clouds Next Topic: Cumulus Clouds

The final form taken by a growing cumulus cloud is the cumulonimbus cloud, which is very tall and dense. The tower of a cumulonimbus cloud can soar 23 km into the atmosphere, although most commonly they stop growing at an altitude of 6 km.

Even small cumulonimbus clouds appear very large in comparison to other cloud types. They can signal the approach of stormy weather, such as thunderstorms or blizzards.

Next Topic: Cumulus Clouds