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Heat index values, or humidity-driven “feels\u00a0like” temperatures, will be solidly in the triple digits by 3 p.m. Wednesday, according to the National Blend of Models, a composite weather forecast model.<\/p>\n
National Blend of Models\/Pivotal Weather<\/p>\n
San Antonio could record its first 100-degree reading<\/a> of the year Wednesday, while humid, moisture-rich air drawn in by southeast winds from the Gulf of Mexico could make that temperature feel several degrees hotter,\u00a0according to the National Weather Service<\/a>.<\/p>\n \u201c(Afternoon) high temperatures will continue to intensify through the middle of the week,\u201d the weather service said in a forecast bulletin<\/a> posted online Tuesday. \u201cHeat index values will be highest on Wednesday and\u00a0Thursday, particularly along and east of I-35.\u201d<\/p>\n Article continues below this ad<\/p>\n San Antonio shouldn\u2019t expect much relief from the heat<\/a> at night, either. Wednesday night\u2019s partly cloudy skies will help keep overnight temperatures above 83 degrees into Thursday morning.<\/p>\n Forecasters pointed to upper-level ridging, or strengthening high atmospheric pressure<\/a>, near Texas that \u201cwill bring a hot and generally rain-free pattern through the\u00a0middle part of the week.\u201d\u00a0<\/p>\n \u201cWednesday will easily be\u00a0the warmest day of the week, especially for the Rio Grande Plains\u00a0and areas along and east of the I-35 corridor where afternoon highs\u00a0will reach into the lower 100s to some areas hitting the middle\u00a0100s,\u201d the weather service said. \u201cWe will see an increase in mid-level moisture on Wednesday,\u00a0which will help max heat index values to reach heat advisory\u00a0criteria levels.\u201d<\/p>\n Article continues below this ad<\/p>\n In anticipation of the combination of excesssive humidity and extreme heat,\u00a0regional weather service office for San Antonio has issued a heat advisory for the San Antonio and Austin metro areas. The heat advisory<\/a>, which is intended to alert the public about the increased risk of heat-related illnesses, will be in effect from noon to 8 p.m. Wednesday.<\/p>\n Affected Texas counties include Bexar, Comal, Guadalupe, Wilson, Karnes and Frio, as well as counties along the Interstate 35 corridor, such as Travis, Hays,\u00a0Williamson and Caldwell.<\/p>\n Thursday forecast<\/p>\n San Antonio on Thursday will be sunny with temperatures approaching 100 degrees.<\/p>\n Article continues below this ad<\/p>\n \u201cWe could see some expanding of a potential heat advisory across more of the region for Thursday and heat index values will once again reach that critical threshold of 108 degrees although ambient temperatures will be slightly lower than that on Wednesday,\u201d Platt said.<\/p>\n But the most unknown factor\u00a0in the forecast remained several hundred miles to the east.<\/p>\n \u201cRight\u00a0now it will be tough to pinpoint much else in way of temperatures\u00a0for the rest of the week as we continue to monitor what is now\u00a0Tropical Storm Bertha,\u201d Platt wrote.<\/p>\n Tropical Storm Bertha is expected to approach the Texas coast by Friday morning, according to the National Hurricane Center.<\/p>\n National Hurricane Center<\/p>\n Tropical Storm Bertha<\/p>\n<\/p>\n
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