15 May 2021 (16 May 2021 UTC) – times are also UTC (subtract 5:10 hours for CDT)
Storms to the S and moving in from the W along IH10 & USHwy90, Bracken Stuart 0:36, DavisBlowout 0:46, Frio 1:04, Huber 1:20, Seguin 1:28, Bracken2 1:32, SMCenterpoint 1:36, Wimberley SanMarcos 1:40, McNeil 1:46, WellsBranch 1:48, GrapeCreek FosterRd 1:52, FtHood Salado NLamar UT Loyola Congress Dittmar 1:54, Temple 2:00,
2021-05-16_UTC

14 May 2021 (15 May 2021 UTC) – times are also UTC (subtract 5:10 hours for CDT)
Bracken (1,975,507 – 22% to altitude) flew all the way to Chiroptorium starting at 23:58, DavisBlowout 0:28, Stuart 0:36, Frio 1:00, Huber 1:04, Crownridge 1:32, SMRB-Slayden 1:34, Frio2 1:38, Manor Dittmar 1:40, Loyola Congress Maverick 1:42, McNeil 1:46, GrapeCreek FosterRd 1:56, Fern 2:00,
2021-05-15_UTC

13 May 2021 (14 May 2021 UTC) – times are also UTC (subtract 5:10 hours for CDT)
Bracken 0:14, Frio 0:36, DavisBlowout Ney 0:40, D’Hanis 0:44, Huber 1:02, Stuart 1:04, McNeil 1:32, Lakeway Loyola SMCenterpoint 1:36, Wimberley Camden SMRBDabney 1:38, FtHood WellsBranch DuncanPk Dittmar Onion Buda MustangRidge TX28 1:40, Congress 1:42, NLamar UT 1:46, ABIA Maverick 1:50, Stuart2 GrapeCreek 1:54, FosterRd 2:04,
2021-05-14_UTC

12 May 2021 (13 May 2021 UTC) – times are also UTC (subtract 5:10 hours for CDT)
Cave bat numbers strong – insulated from chilly N winds prior to emergence, bridge bat flight numbers diminished – exposed to chilly wind, Bracken 0:06, Frio (541,420 – ~63k (12%) to altitude) 0:30, Ney 0:56, Stuart (543,654 – 229.4K (42%) to altitude) 1:06, McNeil 1:28, SanMarcos SMCenterpoint 1:32, Congress Dittmar Buda Wimberley 1:34, GrapeCreek FosterRd 1:50,
2021-05-13_UTC

11 May 2021 (12 May 2021 UTC) – times are also UTC (subtract 5:10 hours for CDT)
Strong storms across the Southeastern Hill Country sweeping past the IH35 corridor, Frio 0:32, Stuart 1:04, Bracken after storm at 1:36, FosterRd 1:40, Hwy1572 1:42, Maverick 1:44, GrapeCreek 1:46, Ney 1:54, all others suppressed / confounded by storms
2021-05-12_UTC

10 May 2021 (11 May 2021 UTC) – times are also UTC (subtract 5:10 hours for CDT)
Storm from W moving E across the southern SBA, another from Junction moving E toward RoundRock, between the two they suppressed and/or confounded all bat flights with exception of Stuart (480,696 – 30% to altitude (144,380)) chased tail end of storm 1:12, Bracken (1,135,606 – 5% to altitude (57,5360)) 1:24, Frio 4:04 small flight after the rain stopped
2021-05-11_UTC

09 May 2021 (10 May 2021 UTC) – times are also UTC (subtract 5:10 hours for CDT)
Storm at Mason sweeps SSE down the near Hill Country, storm at Brady heads up through Cross Timbers bioregion, Stuart 0:56, storm over JamesRiver (no discernable flight)1:00, Frio 1:02, D’Hanis 1:08, Bracken 1:22, Ney 1:26, DavisBlowout 1:28, Huber 1:34, SMCenterpoint TX28 Randolph 1:36, 410&IH35 SanPedro BalconesHeights 1:42, McNeil 1:44 after storm, SanMarcos Hwy1572 1:44, FosterRd 1:46, OldTunnel Wimberley GrapeCreek Fern 1:48, EaglePass Maverick 1:52, Congress 2:12 after storm,
2021-05-10_UTC

08 May 2021 (09 May 2021 UTC) – times are also UTC (subtract 5:10 hours for CDT)
DavisBlowout 0:40, Frio 0:52, Stuart 0:54, D’Hanis 1:06, Bracken 1:28, Huber Hwy1572 1:36, SanMarcos SMCenterpoint TX28 410&IH35 SanPedro BalconesHeights Crownridge 1:38, McNeil 1:44, OldTunnel Wimberley Randolph Comfort 1:46, GrapeCreek FosterRd 1:48, BeaverCreek FtHood Salado 1:50, Lackland 1:52, Congress 2:04,
2021-05-09_UTC

07 May 2021 (08 May 2021 UTC) – times are also UTC (subtract 5:10 hours for CDT)
DavisBlowout 0:32, Frio Rucker 0:38, Stuart 0:52, Bracken 1:22, Huber 1:34, 410&IH35 SanPedro Ney 1:36, SMCenterpoint SmythCrossing Hwy1572 Maverick 1:38, McNeil 1:42, Chiroptorium Wimberley TX28 Randolph SanPedro Camden Crownridge FairOaksRanch 1:44, NuecesRR 1:46, Lakeway Loyola Congress BeaverCreek FtHood EaglePass GrapeCreek FosterRd 1:48, Stuart2 1:52, OldTunnel 1:58, Fern 2:00, JamesRiver first appearance on radar this year 2:02,
2021-05-08_UTC

06 May 2021 (07 May 2021 UTC) – times are also UTC (subtract 5:10 hours for CDT)
Frio 0:32, DavisBlowout 0:42, Stuart 0:46, Ney 0:56, Bracken late 1:18 (2 hrs later than 5 days ago 02May), Huber 1:26, McNeil BalconesHeights 1:34, Maverick 1:36, Chrioptorium WellsBranch Howard DuncanPark Congress SMCenterpoint Randolph 410&IH35 SanPedro 1:40, Dittmar Onion Wimberley SanMarcos 1:42, FosterSt 1:44, GrapeCreek 1:46, BeaverCreek UT Loyola 1:48, Stuart2 1:50, Camden 1:54, Frio2 EaglePass 1:58, Huntsville mostly under radar 2:00,
2021-05-07_UTC