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Humidity-driven heat index values will be in the triple digits by 3 p.m. Saturday in San Antonio, according to the National Blend of Models, a composite weather forecast model.<\/p>\n
National Blend of Models\/Pivotal Weather<\/p>\n
San Antonio is kicking off August on Saturday with more of the same hot and dry weather<\/a> but, thanks to a rare summer cold front surging into Texas, rain could be a welcome surprise overnight, according to the National Weather Service<\/a>.<\/p>\n Saturday is shaping up to have a 20% chance of rain after 4 p.m., forecasters said<\/a>, with daytime temperatures in San Antonio peaking at 99 degrees. Humidity, though, will\u00a0make that projected high temperature feel more like 108 degrees.<\/p>\n Article continues below this ad<\/p>\n At night, San Antonio\u2019s rain chances will hold steady at a slight 20% amid increasing cloudiness and overnight temperatures that will stay above 79 degrees into Sunday morning.<\/p>\n A subtropical ridge of high atmospheric pressure<\/a> has been driving our recent stretch of hot and rain-free days, but\u00a0its grip on Texas weather is loosening this weekend, forecasters said.<\/p>\n Heat index values in Texas would be elevated Saturday as higher levels of atmospheric moisture along a rare August cold front intersected with the warmer temperatures across the state.<\/p>\n Weather Prediction Center\/National Weather Service<\/p>\n \u201cAs the ridge moves a little more west, the (air) flow aloft will turn more\u00a0northerly,\u201d the weather service said in a forecast bulletin<\/a> Friday. \u201cThis will allow a weak front to approach South-Central\u00a0Texas on Saturday.\u201d<\/p>\n Article continues below this ad<\/p>\n Forecasters said heat index values would be elevated Saturday as the higher levels of moisture along\u00a0the front intersected with the warmer temperatures\u00a0in Texas.<\/p>\n \u201cMost\u00a0models bring the weak front over the area Saturday afternoon,\u201d the weather service said. \u201cA low\u00a0to medium chance (20% to 40%) of rain accompanies the front,\u00a0mainly in the form of isolated to scattered showers and\u00a0thunderstorms.\u201d<\/p>\n While rain chances will be higher farther north of San Antonio, \u201cthe best chances for rain are favored Saturday afternoon and evening, subject to when the front arrives,\u201d forecasters said, adding that \u201crain chances linger through Saturday night, by which time the front should be exiting our area to the south.\u201d<\/p>\n Article continues below this ad<\/p>\n Don\u2019t count on any substantial rainfall, though, as projected rainfall amounts are likely to be limited by \u201cthe narrow stretch of favorable conditions\u201d and will be \u201cmostly ranging from a few hundredths to a quarter inch.\u201d<\/p>\n<\/p>\n
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