Monday, July 21, 2025 · Congress Avenue Bridge · Austin, TX
23 minutes after sunset (just before dark on a partly cloudy evening) only ~8% of the colony braved the windy & unstable conditions to fly 6 miles NE (3% of those went to altitude) on SE Winds at 12 mph – had been S 13-17 all afternoon with gusts to 22 mph around 6:30pm, Partly Cloudy, Temp 85°F, Dew Point 72°F steady, 20 Cooling Degree Days, Cloud Base 2964, RH 65% rising, Heat Index 91°F, BP 29.99 rising, sea level 1014.2 mb rising, bats viewable until 9:51 pm under streetlights
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