<\/p>\n
Humidity-driven heat index values will be solidly in the triple digits across South Texas on Wednesday before a slight cooling and a chance of rain on Thursday and Friday.<\/p>\n
National Blend of Models\/Pivotal Weather<\/p>\n
A heat advisory\u00a0warning the public about the dangerous combination of extreme heat<\/a> and elevated humidity is in effect Wednesday for San Antonio, much of the Interstate 35 corridor and parts of the Hill Country, the National Weather Service said.<\/p>\n How extreme is the heat? For starters, if San Antonio temperatures on Wednesday hit 100 degrees or higher, as they are expected to do, it would happen for the 10th time in a row. That reading also would make it 14 days of triple-digit heat for the year.<\/p>\n Article continues below this ad<\/p>\n A more troubling milestone, though, is how long we\u2019ve gone without measurable rainfall<\/a> in San Antonio. The city\u2019s official climate observation site at San Antonio International Airport hasn\u2019t recorded measurable rainfall since July 24, when the gauges there caught only 0.13 inch of rainfall. Every day since then, we\u2019ve seen either no rain or merely trace amounts (less than 0.01 inch).<\/p>\n As we enter our second month of dryness, only low to medium chances for rain could emerge Thursday and Friday, according to weather service forecasters<\/a>.<\/p>\n Wednesday forecast<\/p>\n Thanks to a heat dome of high air pressure<\/a> that\u2019s been keeping temperatures higher and the air drier in South Texas, San Antonio on Wednesday will be sunny and hot. Afternoon temperatures should top out around 103 degrees, or about 8 degrees warmer than normal for\u00a0Aug. 26. Humidity will make that triple-digit heat feel even hotter, closer to 107.<\/p>\n Article continues below this ad<\/p>\n On hot days, the body cools down through the evaporation of sweat from our skin. But if the air is too humid, or too saturated with water vapor, that evaporation becomes more difficult and the air \u201cfeels\u201d hotter than the temperature would suggest. The heat index accounts for that.<\/p>\n Once your body\u2019s ability to cool down is compromised, you are more vulnerable to heat-related illnesses<\/a>, such as heatstroke or heat exhaustion, which can cause dizziness or nausea.<\/p>\n More moisture-rich air is expected in South Texas with the return of south-southeast winds from the Gulf Coast in the afternoon. At night, under mostly clear skies, temperatures will bottom out around 79 degrees before sunrise Thursday.<\/p>\n Article continues below this ad<\/p>\n Weather\u00a0models indicate that the heat dome will shift farther west Thursday and Friday, allowing upper-atmospheric winds to flow out of the northwest and a trough of rain-friendly low pressure to approach our region, forecasters said.<\/p>\n \u201cThis has the benefit of both shifting\u00a0the warmest portion of the summertime air mass away from our area,\u00a0and also providing an avenue for weak areas of\u00a0vorticity to round the ridge (of high pressure) and skirt South-Central Texas, bringing some potential for showers and thunderstorms,\u201d the weather service said in a forecast bulletin<\/a> Tuesday.<\/p>\n Thursday and Friday forecast<\/p>\n San Antonio on Thursday has a 30% chance of rain in the afternoon on an otherwise mostly sunny and hot day. Daytime temperatures could get to 100, but no higher than that. At night, rain chances edge higher to 40% amid northerly winds before diminishing shortly after midnight.<\/p>\n Article continues below this ad<\/p>\n On Friday, the city has only a 20% chance of afternoon rain, but temperatures are expected to stay below 100, peaking around 99 degrees under mostly sunny skies.<\/p>\n \u201cGiven the broader environment, any convection (storm activity) that develops will probably be high-based, with the strongest cells providing a threat for gusty winds and lightning,\u201d the weather service said. \u201cThe likelihood for rain is expected to decrease from north to south.\u201d<\/p>\n","protected":false},"excerpt":{"rendered":"Humidity-driven heat index values will be solidly in the triple digits across South Texas on Wednesday before a…\n","protected":false},"author":2,"featured_media":417203,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[82,84,83],"class_list":["post-417202","post","type-post","status-publish","format-standard","has-post-thumbnail","category-san-antonio","tag-san-antonio","tag-san-antonio-headlines","tag-san-antonio-news"],"_links":{"self":[{"href":"https:\/\/www.newsbeep.com\/us-tx\/wp-json\/wp\/v2\/posts\/417202","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=417202"}],"version-history":[{"count":0,"href":"https:\/\/www.newsbeep.com\/us-tx\/wp-json\/wp\/v2\/posts\/417202\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/us-tx\/wp-json\/wp\/v2\/media\/417203"}],"wp:attachment":[{"href":"https:\/\/www.newsbeep.com\/us-tx\/wp-json\/wp\/v2\/media?parent=417202"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsbeep.com\/us-tx\/wp-json\/wp\/v2\/categories?post=417202"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsbeep.com\/us-tx\/wp-json\/wp\/v2\/tags?post=417202"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}<\/p>\n