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Thursday September 4, 2025

8:05 pm – 8:35 pm

 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 been flying for about 6 weeks now, so flights can be great nowadays, especially if a front moves through that stirs up insect activity.

Sunset: 7:50 pm
Dark: 8:20 pm (10-20 min). earlier if cloudy)
Sunrise: 7:09 am

Wednesday September 3, 2025

Flight: 8:22 pm

31 mins after sunset (about at dark) ~44% of the colony flew – some went 4 miles SW while most went 12 miles SE (~21% of them went to altitude) on N Winds at 7 mph – had been northerly 9-15 mph all afternoon with gusts to 21 mph around 4:30pm, Partly Cloudy, Temp 88°F, Dew Point 56°F rising, 18 Cooling Degree Days, Cloud Base 7296′, RH 34% rising, Heat Index 86°F, BP 29.85 steady, sea level pressure 1009.8 mb rising, bats viewable until 10:35 pm under streetlights

Tuesday September 2, 2025

Bracken 1:04, Frio 1:08, SchertzClemens TX28 SanPedro 1:14, Stuart 1:18, 410&IH35 Camden 1:20, Fern 1:22, OldTunnel Chiroptorium SanMarcos SMCenterpoint NewBraunfels SALutheran Seguin 1:24, Congress(~59% of the colony flew – some went 6 miles WSW while most went 12 miles SSE ~39% of them went to altitude) 1:28, Huber McNeil 1:30, SMRB(Slayden) Floresville 1:32, DavisBlowout Ney D’Hanis Knippa NuecesRR 1:36, SanAngelo 1:42, FosterRd 1:46,

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Wednesday September 3, 2025

8:00 pm – 8:30 pm

 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 been flying for about 6 weeks now, so flights can be great nowadays, especially if a front moves through that stirs up insect activity.

Sunset: 7:51 pm
Dark: 8:21 pm (10-20 min). earlier if cloudy)
Sunrise: 7:09 am

Tuesday September 2, 2025

Flight: 8:20 pm

28 mins after sunset (about at dark) ~59% of the colony flew – some went 6 miles WSW while most went 12 miles SSE (~39% of them went to altitude) on NE Winds at 8 mph – had been northerly 9-17 mph all afternoon with gusts to 22 mph around 6:30pm, A Few Clouds, Temp 90°F, Dew Point 61°F steady, 19 Cooling Degree Days, Cloud Base 6612′, RH 38% rising, Heat Index 90°F, BP 29.92 steady, sea level pressure 1012.1 mb rising, bats viewable until 10:37 pm under streetlights

Monday September 1, 2025

Spotty storm cells heading S along IH35 & US281 dissipating toward flight time, southbound storms at Bandera & DelRio, Chiroptorium 0:30, Frio 0:34, Bracken 0:54, SanPedro 1:02, BalconesHeights 1:04, SALutheran SaladoCreek&MLKdrive 1:06, OldTunnel Stuart 1:10, Huber SchertzClemens 1:12, DavisBlowout SMCenterpoint SCUCISD TX28 Seguin 1:14, Wimberley Lockhart SanMarcos SMRB(Slayden) 1:16, McNeil Congress(~36% of the colony flew – some went 4 miles SW while most went 18 miles SSE ~7% of them went to altitude) 1:18, Crestwood&IH35 Loyiola Dittmar 1:20, D’Hanis 1:22, WellsBranch NLamar 1:24, NuecesRR 1:24, Floresvile OCFisher 1:26, SmythCrossing 1:28, Ney 1:32, SanAngelo FosterRd 1:40, GrapeCreek 1:46,

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Tuesday September 2, 2025

7:50 pm – 8:20 pm

 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 been flying for about 5 weeks now, so flights can be great nowadays, especially if a front moves through that stirs up insect activity.

Sunset: 7:52 pm
Dark: 8:22 pm (10-20 min). earlier if cloudy)
Sunrise: 7:08 am

Monday September 1, 2025

Flight: 8:10 pm

17 mins after sunset (about at dark on a Mostly Cloudy evening) ~36% of the colony flew – some went 4 miles SW while most went 18 miles SSE (~7% of them went to altitude) on N Winds at 5 mph – had been Light & Variable turning NW at 8 mph around 4:30pm, Mostly Cloudy, Temp 87°F, Dew Point 69°F steady, 18 Cooling Degree Days, Cloud Base 4104′, RH 55% rising, Heat Index 91°F, BP 29.94 steady, sea level pressure 1012.8 mb steady, bats viewable until 9:23 pm under streetlights

Monday September 1, 2025

7:50 pm – 8:20 pm

 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 been flying for about 5 weeks now, so flights can be great nowadays, especially if a front moves through that stirs up insect activity.

Sunset: 7:53 pm
Dark: 8:23 pm (10-20 min). earlier if cloudy)
Sunrise: 7:08 am

Sunday August 31, 2025

Widespread rainstorms moving eastward across the entire Hill Country, strong storms over SanAntonio, Bracken 0:36 as strongest storms skirt it to the S, Frio 0:50, McNeil 0:56 as storm approaches, Frio 0:50, Congress 1:00 (~891,961 braved the unstable conditions and flew 12 miles SE ~31% of them went to altitude), D’Hanis 1:18, SanAngelo FosterRd 1:26, other potential flights suppressed or readings confounded by weather

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