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Oreothlypis celata
4.25 inches. Thin, very pointed bill, indistinct yellow supercilium, indistinct broken eye ring, grey to olive head, back, and wings, yellow to dull yellow/olive underparts with blurry, indistinct streaks on breast. Yellow undertail coverts. Females and immatures are somewhat duller. Orange crown rarely shows; most visible when crown feathers are raised, and from behind.
On a branch beside the Duck Trail at the Heard Natural Science Museum & Wildlife Sanctuary, in McKinney Texas.
The Heard Natural Science Museum & Wildlife Sanctuary, in McKinney Texas, is the result of Bessie Heard’s vision for the future and her commitment to the community and North Texas. Founded in 1967, the Heard consists of a 289 acre wildlife sanctuary and a natural science museum for the primary purpose of educating children about nature. The Heard exists to bring nature and people together to discover, enjoy, experience, restore, and preserve our priceless environment. In keeping with Miss Heard’s vision, the Heard’s purpose is threefold: education, conservation, and preservation. Through education, particularly for young people, the Heard emphasizes an appreciation of nature and its conservation. http://www.heardmuseum.org/index.asp
It looked grayish, but the light was poor. Major storm front was coming in with very low dark clouds. Could not see the under tail color. There were only 3 of these birds for a brief moment in the snags at the edge of a prairie. We have Yellow, Orange-crowned, Yellow-rumped, and Nashville that come through. I am a real novice at warblers.
You didn't mention what colors were on the bird. Was it yellow with reddish streaks?