Sunday, August 17, 2025 · Congress Avenue Bridge · Austin, TX
~11 mins after sunset (8 mins before dark on a Mostly Cloudy evening) ~41% of the colony flew 10 miles NNE (~27% of the total went to altitude) on SE Winds at 13 mph with gusts to 26 mph – had been southerly 10-16 mph & gusty all afternoon, Mostly Cloudy, Temp 91°F, Dew Point 74°F rising, 22 Cooling Degree Days, Cloud Base 3876′, RH 57% steady, Heat Index 101°F, BP 29.96 rising, sea level pressure 1013.1 mb rising, bats viewable until 9:27 pm under streetlights
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