Right now
The most recent data we hold from NOAA arrived 1 minute ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
One other detection within 20 km in the last 24 hours, <1 km from here.
This alert expired on 11 May 2026 at 07:00 UTC. It is kept here as a record.
It is the 7th strongest of the 134 detections recorded within 20 km of this point since 10 March 2026. Another comparable one was recorded here earlier the same day. 22 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Watch issued May 10 at 10:55PM CDT until May 11 at 2:00AM CDT by NWS Austin/San Antonio TX
An estimated 389,158 people live within 50 km of this point.
Nearby, since 10 March 2026
- September 13, 2026 · score 37 · 0.0 km
- August 7, 2026 · score 43 · 0.0 km
- July 6, 2026 · score 43 · 0.0 km
How we know
Confirmed by 15 independent sources, including NOAA.
Our own score for this event is 43 out of 100, at 90 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 43 / 100 |
| Our confidence | 90% |
| Coordinates | 31.0000, -97.6000 |
| Nearest City | Harker Heights (11 km) |
| Population Exposed | 389.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-11T03:55:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Watch_noaa_urn:oid:2.49.0.1.840.0.8ac27880451f806c41589fc0600a5bfe |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Watch |
| Urgency | Future |
| Certainty | Possible |
| AreaDesc | Atascosa, TX; Bandera, TX; Bastrop, TX; Bexar, TX; Blanco, TX; Burnet, TX; Caldwell, TX; Comal, TX; DeWitt, TX; Fayette, TX; Frio, TX; Gillespie, TX; Gonzales, TX; Guadalupe, TX; Hays, TX; Karnes, TX; Kendall, TX; Kerr, TX; Lavaca, TX; Lee, TX; Llano, TX; Maverick, TX; Medina, TX; Travis, TX; Uvalde, TX; Williamson, TX; Wilson, TX; Zavala, TX; Dimmit, TX; Aransas, TX; Bee, TX; Calhoun, TX; Duval, TX; Goliad, TX; Jim Wells, TX; Kleberg, TX; La Salle, TX; Live Oak, TX; McMullen, TX; Nueces, TX; Refugio, TX; San Patricio, TX; Victoria, TX; Webb, TX and 1 more areas |
| Headline | Severe Thunderstorm Watch issued May 10 at 10:55PM CDT until May 11 at 2:00AM CDT by NWS Austin/San Antonio TX |
| Expires | 2026-05-11T02:00:00-05:00 |
| SenderName | NWS Austin/San Antonio TX |
| HasExactCoords | false |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.8ac27880451f806c41589fc0600a5bfe86d68624.002.1","noaa_urn:oid:2.49.0.1.840.0.8ac27880451f806c41589fc0600a5bfe86d68624.001.1","noaa_urn:oid:2.49.0.1.840.0.67210d5e2d0aaad04c382c5b4481d7f16ef5e6f0.001.1","noaa_urn:oid:2.49.0.1.840.0.4d7d9790029976edb99e3e8807581379e9370838.001.1"] |
| Iem TypeSummary | H |
| Iem Magnitude | 1 |
| Iem Unit | Inch |
| Iem City | 1 S Mcgregor |
| Iem County | McLennan |
| Iem State | TX |
| Iem Wfo | FWD |
| Iem Remark | Quarter size hail reported on the south side of McGregor. |
| MergedSources | [{"id":"iem_H_30.770_-97.750_1778464740000","source":"iem","severity":"low","severityValue":25,"timestamp":1778464740000,"latitude":30.77,"longitude":-97.75},{"id":"iem_F_31.090_-97.480_1778469360000","source":"iem","severity":"low","severityValue":25,"timestamp":1778469360000,"latitude":31.09,"longitude":-97.48},{"id":"iem_H_30.760_-98.220_1778464560000","source":"iem","severity":"low","severityValue":25,"timestamp":1778464560000,"latitude":30.76,"longitude":-98.22},{"id":"iem_N_30.680_-97.680_1778465760000","source":"iem","severity":"low","severityValue":25,"timestamp":1778465760000,"latitude":30.68,"longitude":-97.68},{"id":"iem_G_30.680_-97.680_1778465760000","source":"iem","severity":"low","severityValue":25,"timestamp":1778465760000,"latitude":30.68,"longitude":-97.68},{"id":"iem_H_31.350_-97.680_1778459760000","source":"iem","severity":"low","severityValue":25,"timestamp":1778459760000,"latitude":31.35,"longitude":-97.68},{"id":"iem_H_31.310_-97.630_1778460120000","source":"iem","severity":"low","severityValue":25,"timestamp":1778460120000,"latitude":31.31,"longitude":-97.63},{"id":"iem_R_31.050_-97.460_1778471100000","source":"iem","severity":"low","severityValue":25,"timestamp":1778471100000,"latitude":31.05,"longitude":-97.46},{"id":"iem_H_31.450_-97.890_1778458140000","source":"iem","severity":"low","severityValue":25,"timestamp":1778458140000,"latitude":31.45,"longitude":-97.89},{"id":"iem_F_30.870_-97.400_1778467320000","source":"iem","severity":"low","severityValue":25,"timestamp":1778467320000,"latitude":30.87,"longitude":-97.4},{"id":"iem_H_31.440_-97.680_1778459280000","source":"iem","severity":"low","severityValue":25,"timestamp":1778459280000,"latitude":31.44,"longitude":-97.68},{"id":"iem_F_31.050_-97.470_1778470320000","source":"iem","severity":"low","severityValue":25,"timestamp":1778470320000,"latitude":31.05,"longitude":-97.47},{"id":"iem_H_31.450_-97.380_1778462100000","source":"iem","severity":"low","severityValue":25,"timestamp":1778462100000,"latitude":31.45,"longitude":-97.38},{"id":"iem_H_31.440_-97.380_1778461920000","source":"iem","severity":"low","severityValue":25,"timestamp":1778461920000,"latitude":31.44,"longitude":-97.38}] |
Safety Information
Always follow official guidance from your local emergency management agency. This platform provides scientific monitoring data and is not a substitute for official warnings. If you are in immediate danger, contact your local emergency number.
Series begins 8 March 2026. Comparisons refer to that period only. Collection gap: 14-26 August 2026.
This data is aggregated algorithmically from scientific sources. Not a replacement for official emergency warnings.
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