According to the McAllen International Airport please check with your airlines before traveling. Here is an advisory from United Airlines, "If you are traveling to or through Houston IAH airport over the next couple of days they are experiencing inclement weather UA airlines has put in place some waivers for travel modifications. Please review united.com for the latest updates for your travel itinerary, you will be able to make modifications there also if your travel is impacted or if you wish to avoid possible weather delays and reschedule at a later date. Again this is just customer service advisement."
http://www.mcallenairport.com/