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, get there early! Flights are trending closer to dark as is typical after mid-May. Today’s Predicted Average Temperature is 85.5°F If today’s Predicted Average Temperature is over 55°F but below 90°F with light winds, then there’s a chance for a strong flight
Sunset: 8:19 pm Dark: 8:49 pm (10-20 min. earlier if cloudy) Sunrise: 6:36 am
16 May April 2025 Local Date – (17 May 2025 UTC(Universal Coordinated Time)) – times are also UTC (subtract 5:08 hours for CDT of flights – 0:08 is about 6:00 pm CDT)
Strong storm forming S of Llano heading E skirting the north side of Round Rock, Bracketville radar offline at 0:44, Frio 1:14, Stuart unspecified time, OldTunnel 1:26, Bracken Ney FosterRd 1:36, Bracketville radar back online at 1:38, D’Hanis Frio2 SmythCrossing NuecesRR FM1572 SycamoreCreek Fern 1:38, NewBraunfels SchertzClemens Longhorn&Western SanPedro BalconesHeights 1:40, SanMarcos SMCenterpoint SCUCISD TX28 410&IH35 SALutheran Camden Seguin Rucker 1:44, Crestwood 1:46, Wimberley Harwood SanAngelo 1:48, Huber Congress(69& of the colony flew 30 miles ESE – 30%of those went to altitude) Lockhart SMRB(Slayden) Floresville 1:52, GrapeCreek 1:54, Chiroptorium 1:56, WellsBranch 2:06, McNeil 2:18 as storm skirts to N – flew out into the wake of the storm,
16 May April 2025 Local Date – (17 May 2025 UTC(Universal Coordinated Time)) – times are also UTC (subtract 5:08 hours for CDT of flights – 0:08 is about 6:00 pm CDT)
Strong storm forming S of Llano heading E skirting the north side of Round Rock, Bracketville radar offline at 0:44, Frio 1:14, Stuart unspecified time, OldTunnel 1:26, Bracken Ney FosterRd 1:36, Bracketville radar back online at 1:38, D’Hanis Frio2 SmythCrossing NuecesRR FM1572 SycamoreCreek Fern 1:38, NewBraunfels SchertzClemens Longhorn&Western SanPedro BalconesHeights 1:40, SanMarcos SMCenterpoint SCUCISD TX28 410&IH35 SALutheran Camden Seguin Rucker 1:44, Crestwood 1:46, Wimberley Harwood SanAngelo 1:48, Huber Congress(69& of the colony flew 30 miles ESE – 30%of those went to altitude) Lockhart SMRB(Slayden) Floresville 1:52, GrapeCreek 1:54, Chiroptorium 1:56, WellsBranch 2:06, McNeil 2:18 as storm skirts to N – flew out into the wake of the storm,
When conditions allow, i.e. when temps are >50°F, Dew Point >45°F, Heating Degree Days <9, atmosphere stable, no pressure drops, no strong wind, no rain in the area.
Chance of a good flight if conditions stable, but likely after dark
Sunset: 8:29 pm
Dark: 8:59 pm (10-20 minutes earlier if cloudy)
Sunrise: 6:29 am
26 minutes after sunset, ~69% of the colony flew 30 miles ESE (~30% of those flew to altitude) on SE Winds at 13 mph with gusts to 21 mph – had been southerly 12-18 mph all afternoon with gusts to 26 mph around 2:30pm, Visibility 10 miles, Mostly Cloudy, Temp 87°F, Dew Point 73°F steady, 22 Cooling Degree Days, Cloud Base 3192′, RH 63% rising, Heat Index 95°F, BP 29.78 rising, sea level 1007.3mb rising, bats viewable until 10:23 pm under streetlights
Fern showing signs of stress at 0:52, Rucker 1:18, Frio 1:22, Bracken Sabinal 1:44, Stuart 1:46, SchertzClemens Seguin 1:54, BalconesHeights 2:02, McNiel 2:06, OldTunnel Chiroptorium Camden Culebra&Bandera 2:08, DavisBlowout Huber 2:14, CongressScouts 2:20, Congress(only ~4% of the colony flew 6 miles NNE) 2:48,
~80 minutes after sunset (way after dark) ~6% of the colony flew 3 miles W (~38% went to altitude) on S Winds at 12 mph – had been SE 13-17 mph most of the afternoon with gusts to 22 mph around 4pm, Partly Cloudy, Temp 85°F, Dew Point 74°F rising, Visibility 10 miles, 21 Cooling Degree Days, Cloud Base 2508′, RH 70% rising, Heat Index 93°F, BP 29.77 rising, bats viewable until 11:13 pm under streetlights
Storms over the TransPecos with rain extending to SanAngelo & Junction, strong storms between Waco & Dallas, Frio 1:30, Punkin 1:32, Stuart 1:42, Bracken Timberwood 1:48, SchertzClemens 1:56, NewBraunfels TX28 Camden Culebra&BanderaRd 2:02, EaglePass 2:06, Chiroptorium SCUCISD 410&IH35 BalconesHeights 2:10, NuecesRR SmythCrossing 2:12, DavisBlowout Huber 2:14, OldTunnel 2:16, McNeil 2:34, CongressScouts 2:44, Congress(~6% of the colony flew a few miles W) 2:56,