Dark blue cloudy sky

What is Blocking Pattern?

Occurs when centers of high pressure and/or low pressure set up over a region in such a way that they prevent other weather systems from moving through.

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Glossary

A blizzard is a storm that lasts 3 hours or more, with persistent winds/frequent gusts of 35 mph or more along with significant...

Particles such as pollen, grass seeds, or dust in the air that cause allergies and are transported by winds.

A rapidly rotating column of air extending from a thunderstorm to the ground, capable of causing significant damage.

A weather front formed when a cold front overtakes a warm front, lifting the warm air off the ground and resulting in a mix...

A line of severe thunderstorms that can form along or ahead of a cold front, often producing strong winds and heavy rain.

The trapping of heat in the Earth's atmosphere due to greenhouse gases, such as carbon dioxide and methane, which allows...

A thin, white cloud layer that is intertwined or separate, arranged in regular order, and does not cast a shadow.

A weather warning means that a weather hazard is occurring, imminent, or likely. In other words, severe weather is happening...

A very cold high pressure that originates over the Arctic Ocean.

A term used to identify clouds with a base height below 6,000 feet in the observer's direction. Stratiform clouds consist...