Photo Credit: 
National Weather Service Fort Worth/Dallas

A National Weather Service heat advisory will remain in effect through Tuesday evening, and thunderstorms also may be expected, authorities said. 
The NWS renewed a heat advisory at 3:42 a.m. Monday, effective until 7 p.m. Tuesday. The advisory affects Lampasas, Coryell, Hamilton and other nearby counties. 
The advisory stated that temperatures are expected to reach “upper 90s to around 104 degrees” during that time frame, with heat indices of “between 105 and 110 degrees,” NWS said. 
This will make six consecutive days of high heat index, NWS meteorologist Jason Dunn said.
“It’s not that uncommon to have a stretch of hot weather during this point of the summer,” he said. “We’re at the peak heating of the summer.”
A heat advisory means that afternoon heat index values are expected to meet or exceed 105 degrees for at least two consecutive days.
“Heat exhaustion or heat stroke may occur if you are outdoors for extended periods of time,” the statement read. 
Dunn added that people should be cautious about outdoor activity. 
“It’s summertime – it’s hot,” he said. “You’ve got to stop and take breaks and drink water.”
Dunn said Tuesday “will probably be the hottest day of the week.”
After a dip in the heat index Monday evening, the index is expected to continue to rise, meteorologists said. 
“The excessive heat and humidity will persist into Tuesday,” officials said. “Afternoon heat index values will intensify further on Tuesday when the heat index is expected to top 110 degrees across areas east of [U.S.] Highway 281, which includes the Dallas-Fort Worth, Waco-Temple-Killeen and Sherman-Denison areas.”
Tuesday afternoon will see chances of isolated thunderstorms along the Interstate 20 and Interstate 30 corridors, NWS officials said. 
“The thunderstorm chances will increase Tuesday night and will gradually spread south and encompass all of North and Central Texas on Wednesday,” meteorologists said. “Frequent lightning strikes and very gusty downburst winds will be the primary hazards with stronger storms through the period.”
Thunderstorms may linger in portions of Central Texas through Thursday, the statement read. 
Dunn said the Lampasas area will see a 30 percent chance of thunderstorms, though most of the storm activity probably will occur to the north. 
“Either way, we will cool down to the 90s [on Wednesday],” he said. “There’s a weak cold front flying down through Oklahoma. There will be a big high-pressure ridge that will allow for a cool down.” 

Heat safety
“Be sure to check on persons with health problems and the elderly, as they are the most susceptible to heat exhaustion and heat stroke,” authorities said. “Never leave young children or pets in an enclosed vehicle, even for a short time, as temperatures can quickly rise to life-threatening levels.
“Take extra precautions if you work or spend time outside,” NWS officials continued. “When possible, reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose-fitting clothing when possible, and drink plenty of water.”
To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air-conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. 
Officials ask everyone to remember: “Heat stroke is an emergency -- call 911.”