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Sheffield Weather Page

Weather Glossary

Picture courtesy of University of Illinnois
Picture courtesy of climate and weather net
Picture courtesy of University of Illinnois
Picture courtesy of climate and weather net
A cold front is defined as a mass of cooler air replacing warm air ahead of it. Cold fronts are associated with Low pressure systems. When enough moisture is present rain will form on the boundary. If the air is unstable enough Thunderstorms can form along the front. See the pictures below describing the warm front.  
Warm Front
Picture courtesy of University of Illinnois
Picture courtesy of kidlat.pagasa.dost.gov.ph
Occluded Front
Weather Fronts Cold Front
A warm front is a mass of warm air replacing cold air ahead of it. Since cold air is more dense Warm air rises above it. At times in Winter this can lead to freezing rain as rain falls through warmer air into cold air still at ground level. 
An occluded front is where the cool air lifts the warm up above ground between two cool air masses. There are two types of Occlusion Warm and Cold. Although these are rarely mentioned on the forecast what you will generally notice is that it either turns slightly cooler or milder depending on the type of Occlusion. Warm Occlusions are the most frequent causes of freezing rain in the UK where less cold air replaces the cold air but the ground surface is cold enough to allow the rain to freeze on contact. Cold Occlusions often follow cold fronts introducing a colder air mass.   
© Lorem ipsum dolor sit Nulla in mollit pariatur in, est ut dolor eu eiusmod lorem 2014
Sheffield Weather Page
Picture courtesy of University of Illinnois
Picture courtesy of climate and weather net
Picture courtesy of University of Illinnois
Picture courtesy of climate and weather net
A cold front is defined as a mass of cooler air replacing warm air ahead of it. Cold fronts are associated with Low pressure systems. When enough moisture is present rain will form on the boundary. If the air is unstable enough Thunderstorms can form along the front. See the pictures below describing the warm front.  
Warm Front
Picture courtesy of University of Illinnois
Picture courtesy of kidlat.pagasa.dost.gov.ph
Occluded Front
Weather Fronts Cold Front
A warm front is a mass of warm air replacing cold air ahead of it. Since cold air is more dense Warm air rises above it. At times in Winter this can lead to freezing rain as rain falls through warmer air into cold air still at ground level. 
An occluded front is where the cool air lifts the warm up above ground between two cool air masses. There are two types of Occlusion Warm and Cold. Although these are rarely mentioned on the forecast what you will generally notice is that it either turns slightly cooler or milder depending on the type of Occlusion. Warm Occlusions are the most frequent causes of freezing rain in the UK where less cold air replaces the cold air but the ground surface is cold enough to allow the rain to freeze on contact. Cold Occlusions often follow cold fronts introducing a colder air mass.   

Weather Glossary

© Lorem ipsum dolor sit Nulla in mollit pariatur in, est ut dolor eu eiusmod lorem 2014
Sheffield Weather Page
Picture courtesy of University of Illinnois
Picture courtesy of climate and weather net
Picture courtesy of University of Illinnois
Picture courtesy of climate and weather net
A cold front is defined as a mass of cooler air replacing warm air ahead of it. Cold fronts are associated with Low pressure systems. When enough moisture is present rain will form on the boundary. If the air is unstable enough Thunderstorms can form along the front. See the pictures below describing the warm front.  

Warm Front

Picture courtesy of University of Illinnois
Picture courtesy of kidlat.pagasa.dost.gov.ph

Occluded Front

Weather Fronts Cold Front
A warm front is a mass of warm air replacing cold air ahead of it. Since cold air is more dense Warm air rises above it. At times in Winter this can lead to freezing rain as rain falls through warmer air into cold air still at ground level. 
An occluded front is where the cool air lifts the warm up above ground between two cool air masses. There are two types of Occlusion Warm and Cold. Although these are rarely mentioned on the forecast what you will generally notice is that it either turns slightly cooler or milder depending on the type of Occlusion. Warm Occlusions are the most frequent causes of freezing rain in the UK where less cold air replaces the cold air but the ground surface is cold enough to allow the rain to freeze on contact. Cold Occlusions often follow cold fronts introducing a colder air mass.   

Weather Glossary