The most reliable predictor of rain here in Central Texas is the Texas sage, Leucophyllum frutescens. When this plant blooms, rain is on the way. There has been many a time when the local weather forecasters are not predicting rain, but my Texas sages are all blooming like crazy, and within a couple of days we will get rain. It is almost uncanny how reliable these plants are. Anyway, they are all blooming now in anticipation of the rain we are expecting from the tropical storm in the Gulf of Mexico.