The National Weather Service does not forecast allergies, but I found a web page that does!
Go to www.pollen.com
and put in your zip code after clicking on Texas on the US map.
According to their web site, Thursday the pollen levels will be medium-high at 7.7, on Friday they are medium at 7.1, and Saturday they go back to medium-high at 7.6.
The main culprits are ragweed, sagebrush/sage, and elm.