when conditions allow, i.e. when the atmosphere is stable, no pressure drops, no strong wind or rain in the area, If conditions look good (low or no wind), get there early! The Congress bats are still involved with maternity care, so flights will be diminished, unless a front moves through that stirs up insect activity.
Sunset: 8:35 pm Dark: 9:05 pm (10-20 min). earlier if cloudy) Sunrise: 6:36 am
Tuesday July 8, 2025
Flight: 8:56 pm
20 minutes after sunset (even though storm to the East had dissipated) only ~6% of the colony flew 6 miles E (only 1% of those went to altitude) on S Winds at 8 mph – had been S 7-18 mph most of the afternoon with gusts to 30 mph around 4:30pm, Partly Cloudy, Temp 79°F, Dew Point 72°F steady, 19 Cooling Degree Days, Cloud Base 1596′, RH 79% rising, Heat Index 82°F, BP 30.06 falling, sea level 1016.8 mb falling, bats viewable until 10:29 pm as they milled about the bridge under streetlights
Monday July 7, 2025
Outflow boundaries sweep N and W from storms mostly E of the I-35 corridor, Bracken 0:58, Chiroptorium 1:18, Frio 1:34, DavisBlowout 1:34, McNeil 1:42, Huber 1:52, WellsBranch 1:58, Crestwood&IH35 2:00, NLamar Congress(~19% of the colony flew 6 miles E – 7% of those went to altitude) 2:04, Temple 2:06, OldTunnel 2:14, Ney 2:18, JamesRiver SMRB(Slayden) 2:20, SmythCrossing EaglePass 2:24, D’Hanis Stuart Rucker 2:30, SanAngelo FosterRd 2:34, OCFisher GrapeCreek 2:42, Fern 2:44,
20 minutes after sunset (just before dark on a Mostly Cloudy evening) ~19% of the colony flew 6 miles E (7% of those went to altitude) into E Winds at 8 mph – had been southerly 3-10 mph all afternoon, Mostly Cloudy, Temp 81°F, Dew Point 74°F steady, 19 Cooling Degree Days, Cloud Base 1596′, RH 79% rising, Heat Index 86°F, BP 30.01 steady, sea level 1015.2 mb rising, bats viewable until 10:17 pm under streetlights
Sunday July 6, 2025
Storms from Ozona to Mason moving S across the Hill Country, more storms moving N between US281 & IH35 with another moving N skirting the E edge of Austin, Chiroptorium 1:02, DavisBlowout 1:06, McNeil 1:32, Frio 1:36, Huber 1:46, Congress(only ~11% of the colony flew 6 miles NE- 18% of those went to altitude) 2:00, Temple 2:02, OldTunnel Ney 2:18, SanAngelo FosterRd 2:24, OCFisher GrapeCreek 2:30, other possible flights suppressed or readings confounded by weather
16 minutes after sunset (just before dark on a Mostly Cloudy evening) only ~11% of the colony flew 6 miles NE (18% of those went to altitude) on SW Winds at 5 mph – had been southerly 3-15 mph all afternoon turning NE at 18 mph with a Thunderstorm in Vicinity around 5:30 pm, Mostly Cloudy, Temp 77°F, Dew Point 72°F steady, 17 Cooling Degree Days, Cloud Base 1140, RH 85% rising, Heat Index 78°F, BP 29.93 rising, sea level 1012.4 mb steady, bats viewable until 9:43 pm under streetlights
Saturday July 5, 2025
Storms from the N streaming down US281 also through Junction and Ozona, McNeil 0:56, Bracken 1:22, Frio 1:32, JamesRiver NLamar Crestwood&IH35 1:46, Congress(only ~7% of the colony flew 6 miles NE – 1% to altitude) 1:52, Temple 2:14, EaglePass 2:16, GrapeCreek 2:18, SanAngelo FosterRd 2:20, Ney 2:22, other possible flights suppressed or readings confounded by weather
when conditions allow, i.e. when the atmosphere is stable, no pressure drops, no strong wind or rain in the area, If conditions look good (low or no wind), get there early! The Congress bats are in a period of intense maternity care, so flights will be diminished, unless a front moves through that stirs up insect activity.
Sunset: 8:36 pm Dark: 9:06 pm (10-20 min). earlier if cloudy) Sunrise: 6:36 am
Saturday July 5, 2025
Flight: 8:44 pm
8 minutes after sunset (as rain moved S on the E side of Austin) only ~7% of the colony flew 6 miles NE on E Winds at 3 mph – had been southerly 3-14 mph turning N with a Thunderstorm around 4:30pm, Overcast, Temp 75°F, Dew Point 73°F steady, 11 Cooling Degree Days, Cloud Base 456′, RH 94% steady, Heat Index 73°F, BP 29.95 rising, sea level 1013.3 mb rising, bats viewable until 9:39 pm under streetlights
Friday July 4, 2025
Upper-level moisture streaming down from the N across the eastern SBA, Frio 1:04, JamesRiver SanAngelo GrapeCreek 2:16, Rucker 2:18, FosterRd OCFisher 2:22, OldTunnel 2:24, Stuart 2:26, other potential flights suppressed or readings confounded by weather.