Weather During a Warm Front Passage
Before the Warm Front:
- Clouds: As the warm front approaches, you typically see high cirrus clouds followed by wider, more extensive layers of altostratus and stratus clouds. These clouds signify that warm air is moving into the region.
- Temperature: The temperatures start relatively cool but gradually increase as the warm air advances.
- Wind: Winds may be light and variable before the front arrives, typically blowing from the south or southeast.
As the Warm Front Passes:
- Precipitation: Light to moderate rain or drizzle is common. The rain can last for hours and may be steady, but it's usually not heavy. Sometimes, precipitation may start as snow or sleet if temperatures are low enough.
- Visibility: Visibility can decrease significantly due to the rain and low clouds.
After the Warm Front:
- Clouds: The clouds generally become more scattered, and the sky may eventually clear, leading to a brightening of the day.
- Temperature: A noticeable increase in temperature continues, leading to a warmer and more humid atmosphere.
- Humidity: The air feels more humid and is typically more stable than before, resulting in warmer, calmer weather.
Weather During a Cold Front Passage
Before the Cold Front:
- Clouds: The sky may display towering cumulus or cumulonimbus clouds, often accompanied by increasing cloud cover as the front approaches. You may also experience some cirrus clouds ahead of the front.
- Temperature: Ahead of a cold front, temperatures can be warm and humid.
- Wind: Winds usually pick up and may be gusty, often shifting to come from the southwest.
As the Cold Front Passes:
- Precipitation: The passage of a cold front typically brings sudden, intense rainfall, often in the form of thunderstorms with heavy downpours, hail, or even severe weather like tornadoes. The rain is usually short-lived but can be heavy and intense.
- Wind: Winds can be very strong and gusty during and right after the front's passage, often shifting to come from the northwest.
After the Cold Front:
- Clouds: The sky clears rapidly after the front passes, with scattered clouds and blue skies starting to emerge.
- Temperature: A quick drop in temperature often occurs, leading to cooler and drier conditions.
- Humidity: Humidity levels decrease, resulting in clearer, more comfortable air, and sometimes even brisk conditions.
- Pressure: Atmospheric pressure rises, contributing to the clearer skies and fair weather conditions following the front.
In summary, a warm front brings extended periods of gentle rain and warmer, more humid weather, while a cold front leads to dramatic temperature drops, intense precipitation, and often clear, cooler conditions right after it passes.