SAN ANTONIO \u2013 When temperatures soar for days or weeks, meteorologists often describe the pattern as a heat dome \u2014 a large area of high pressure that traps hot air near the surface, creating a prolonged stretch of extreme heat.<\/p>\n
How does a heat dome form?<\/p>\n
A heat dome forms when a strong high-pressure system settles over a region. As air sinks from the atmosphere, it compresses and warms. <\/p>\n
The high pressure acts like a lid, preventing warm air from rising and allowing temperatures to increase day after day.<\/p>\n
How does high pressure create extreme heat? <\/p>\n
Normally, rising warm air helps produce clouds, storms and cooler conditions. During a heat dome, sinking air suppresses those processes by: <\/p>\n
Warming as it compresses near the surface<\/p>\n
Reducing cloud formation, allowing more sunlight to heat the ground<\/p>\n
Limiting rainfall and keeping conditions dry<\/p>\n
Allowing heat to build in the land, roads, and buildings<\/p>\n
Why does it last so long? <\/p>\n
High-pressure systems can become slow-moving and remain over the same area for extended periods. As heat accumulates, overnight temperatures may stay unusually warm because the ground and buildings release stored heat, providing little relief.<\/p>\n
Heat domes can lead to:<\/p>\n
Increased risk of heat exhaustion and heat stroke<\/p>\n
Higher energy demand as people rely on air conditioning<\/p>\n
Drier conditions that raise drought and wildfire risks<\/p>\n
Stress on crops, livestock and natural environments<\/p>\n
Daily Forecast<\/p>\n
KSAT meteorologists keep you on top of the ever-changing South Texas weather.<\/p>\n
QUICK WEATHER LINKS<\/p>\n
Copyright 2026 by KSAT – All rights reserved.<\/p>\n","protected":false},"excerpt":{"rendered":"SAN ANTONIO \u2013 When temperatures soar for days or weeks, meteorologists often describe the pattern as a heat…\n","protected":false},"author":2,"featured_media":414776,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[12277,144552,83322,82,84,83,8083],"class_list":["post-414775","post","type-post","status-publish","format-standard","has-post-thumbnail","category-san-antonio","tag-heat-dome","tag-heatwave","tag-high-pressure","tag-san-antonio","tag-san-antonio-headlines","tag-san-antonio-news","tag-whatever-the-weather"],"_links":{"self":[{"href":"https:\/\/www.newsbeep.com\/us-tx\/wp-json\/wp\/v2\/posts\/414775","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newsbeep.com\/us-tx\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newsbeep.com\/us-tx\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/us-tx\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/us-tx\/wp-json\/wp\/v2\/comments?post=414775"}],"version-history":[{"count":0,"href":"https:\/\/www.newsbeep.com\/us-tx\/wp-json\/wp\/v2\/posts\/414775\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/us-tx\/wp-json\/wp\/v2\/media\/414776"}],"wp:attachment":[{"href":"https:\/\/www.newsbeep.com\/us-tx\/wp-json\/wp\/v2\/media?parent=414775"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsbeep.com\/us-tx\/wp-json\/wp\/v2\/categories?post=414775"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsbeep.com\/us-tx\/wp-json\/wp\/v2\/tags?post=414775"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}