~7 mins after sunset (13 mins before dark on a Partly Cloudy evening) 1,032,160 (~69% of the colony) flew, some went 6 miles ENE while most went 12 miles SSE (~44% of the total went to altitude) into SE Winds tapering down from 9 mph – had alternated between easterly 6-9 mph & Light & Variable all afternoon, Partly Cloudy, Temp 96°F, Dew Point 66°F rising, 22 Cooling Degree Days, Cloud Base 6840′, RH 37% rising, Heat Index 100°F, BP 29.91 rising, sea level pressure 1011.4 mb rising, bats viewable until 9:23 pm under streetlights
Sunday August 17, 2025
Rain & storms moving S early from SanAngelo to Eden, Bracken 0:26, Frio 0:34, Chiroptorium 0:40, 410&IH35 1:00, McNeil 1:06, OldTunnel SanPedro Camden 1:08, SanMarcos SMCenterpoint SCUCISD SchertzClemens TX28 BalconesHeights Seguin SMRB(Slayden) 1:14, Wimberely Lockhart 1:24, Temple WellsBranch NLamar Crestwood&IH35 Loyoal Congress(~42% of the colony flew, some went 8 miles NE while most went 10 miles SSE ~32% of the total went to altitude) ABIA Dittmar Onion Buda 1:28, MustangRidge 1:34, Huber 1:42, SanAngelo FosterRd 1:48, Rucker 1:52, Ney 1:54, GrapeCreek 1:56, BeaverCreek 2:02, Fern 2:06,
~10 mins after sunset (close to dark on a Mostly Cloudy evening) ~42% of the colony flew, some went 8 miles NE while most went 10 miles SSE (~32% of the total went to altitude) into S Winds at 8 mph – had been easterly 7-12 mph most of the afternoon with gusts to 17 mph around 2:30pm, Mostly Cloudy, Temp 95°F, Dew Point67°F steady, 22 Cooling Degree Days, Cloud Base 6384′, RH 40% rising, Heat Index 99°F, BP 29.89 rising, sea level pressure 1010.8 mb rising, bats viewable until 9:07 pm under streetlights
Saturday August 16, 2025
Isolated storms moving N along IH35 at flight time, Frio 0:34, Bracken 0:36, OldTunnel 0:58, Chiroptorium 1:04, McNeil 1:12, SanMarcos NewBraunfels SCUCISD SchertzClemens Randolph SALutheran Seguin 1:16, WellsBranch Crestwood SMRB(Slayden) 1:22, Huber 1:28, NLamar Congress(~41% of the colony flew 10 miles NNE ~27% of the total went to altitude) Dittmar Lockhart 1:30, Temple 1:34, ABIA 1:36, Rucker 1:42, SanAngelo 1:48, FosterRd 1:52, GrapeCreek 1:56, JamesRiver 2:06, other potential flights suppressed or readings confounded by storms
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 bat pups have taken to the wing, so flights can be great nowadays, especially if a front moves through that stirs up insect activity.
Sunset: 8:09 pm Dark: 8:39 pm (10-20 min). earlier if cloudy) Sunrise: 7:00 am
Saturday August 16, 2025
Flight: 8:22 pm
~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
Friday August 15, 2025
Bracken 0:30, Frio 0:46, SanPedro 1:00, OldTunnel 1:04, Chiroptorium 1:10, SanMarcos SchertzClemens 410&IH35 1:16, McNeil NewBraunfels SCUCISD Randolph SALutheran Camden Seguin 1:24, BeeCavePark Wimberley SMCentrpoint SMRB(Slayden) 1:28, Crestwood Congress(~30% of the colony flew, some went 4 miles NNE while most went 12 miles S ~20% of the total went to altitude) Dittmar Onion Buda Lockhart 1:34, WellsBranch NLamar Decker 1:36, NuecesRR 1:42, Temple 1:44, Huber Vanderpool EaglePass 1:50, D’Hanis 1:50, SanAngelo FosterRd 1:52, Rucker US277&TX150 1:56,
~14 mins after sunset (10 mins before dark on a Partly Cloudy evening) ~30% of the colony flew, some went 4 miles NNE while most went 12 miles S (~20% of the total went to altitude) on SE Winds at 6 mph – had been SE 6-16 mph most of the afternoon with gusts to 33 mph and a Thunderstorm w/ Light Rain around 3:30pm, Partly Cloudy, Temp 87°F, Dew Point 73°F falling, 22 Cooling Degree Days, Cloud Base 3192′, RH 63% steady, Heat Index 95°F, BP 30.00 steady, sea level pressure 1014.7 mb rising, bats viewable until 9:37 pm under streetlights
Thursday August 14, 2025
Bracken 0:32, Frio 0:42, 410&IH35 1:08, Chiroptorium NewBraunfels TX28 1:14, OldTunnel SCUCISD Randolph SanPedro Camden FtSam SAMetzgerMS 1:20, McNeil 1:26, SanMarcos SMCenterpoint Luling SMRB(Slayden) 1:28,Wimberley Lockhart WellsBranch Crestwood&IH35 WaterlooGreenway 1:32, CongressScouts 1:34, Congress(only ~15% of the colony flew 12 miles NE ~20% of those went to altitude) Onion Buda 1:38, Loyola ABIA 1:40, Huber1:46, D’Hanis Rucker 1:54, SanAngelo GrapeCreek 2:00, Fern 2:02, DavisBlowout 2:04, JamesRiver 2:06, FosterRd 2:08, Ney 2:22, Temple 2:42,
~17 mins after sunset (just before dark on a Mostly Cloudy evening) only ~15% of the colony flew 12 miles NE (~20% of those went to altitude) on SE Winds at 12 mph – had been SE 10-17 mph most of the afternoon with gusts to 24 mph around 5:30pm, Mostly Cloudy, Temp 95°F, Dew Point 66°F rising, 23 Cooling Degree Days, Cloud Base 6612, RH 39% rising, Heat Index 98°F, BP 29.89 rising, sea level pressure 1010.8 mb rising, bats viewable until 9:25 pm under streetlights