Right now
The most recent data we hold from NOAA arrived 1 hour ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 20 June 2026 at 11:00 UTC. It is kept here as a record.
It is the 4th strongest of the 50 detections recorded within 20 km of this point since 15 June 2026. Another comparable one was recorded here earlier the same day. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued June 20 at 2:04AM CDT until June 20 at 6:00AM CDT by NWS Austin/San Antonio TX
Urban PEI: 1,526,656 within a heuristic 50 km radius; not unique people.
Nearby, since 15 June 2026
- July 16, 2026 · score 76 · 14.7 km
- July 15, 2026 · score 34 · 15.6 km
- June 15, 2026 · score 52 · 17.7 km
How we know
10 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 52 out of 100.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
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) | 52 / 100 |
| Legacy data-support index | 0.90/1 |
| Coordinates | 29.5473, -98.8702 |
| Nearest City | San Antonio (39 km) |
| Urban exposure index (PEI) | 1.5M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-20T07:04:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.424a954d141b9b2c73d368704e4efed9 |
Physical priority index · v1. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: noaa. Occurrence: 2026-06-20T07:04:00.000Z.
First archived: 2026-06-20T08:39:22.944Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Bexar, TX; Medina, TX; Bexar, TX; Comal, TX; Kendall, TX; Bandera, TX; Medina, TX |
| Headline | Flash Flood Warning issued June 20 at 2:04AM CDT until June 20 at 6:00AM CDT by NWS Austin/San Antonio TX |
| Expires | 2026-06-20T06:00:00-05:00 |
| SenderName | NWS Austin/San Antonio TX |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.424a954d141b9b2c73d368704e4efed94c17591e.001.1","noaa_urn:oid:2.49.0.1.840.0.7a2d0f38b59fe328580554c1caea1c046a703f13.001.1","noaa_urn:oid:2.49.0.1.840.0.63fddf615a7f741af19fa8bd742c375091730615.001.1"] |
| Iem TypeSummary | F |
| Iem City | San Antonio |
| Iem County | Bexar |
| Iem State | TX |
| Iem Wfo | EWX |
| Iem Remark | Several low water crossings closed across San Antonio and Bexar County. |
| MergedSources | [{"id":"iem_F_29.730_-99.070_1781936520000","source":"iem","severity":"low","severityValue":25,"timestamp":1781936520000,"latitude":29.73,"longitude":-99.07},{"id":"iem_F_29.500_-98.500_1781939160000","source":"iem","severity":"low","severityValue":25,"timestamp":1781939160000,"latitude":29.5,"longitude":-98.5},{"id":"iem_F_29.630_-98.680_1781940000000","source":"iem","severity":"low","severityValue":25,"timestamp":1781940000000,"latitude":29.63,"longitude":-98.68},{"id":"iem_F_29.530_-98.580_1781939700000","source":"iem","severity":"low","severityValue":25,"timestamp":1781939700000,"latitude":29.53,"longitude":-98.58},{"id":"iem_F_29.560_-98.510_1781940180000","source":"iem","severity":"low","severityValue":25,"timestamp":1781940180000,"latitude":29.56,"longitude":-98.51},{"id":"iem_F_29.640_-98.940_1781937180000","source":"iem","severity":"low","severityValue":25,"timestamp":1781937180000,"latitude":29.64,"longitude":-98.94},{"id":"iem_F_29.590_-98.910_1781939100000","source":"iem","severity":"low","severityValue":25,"timestamp":1781939100000,"latitude":29.59,"longitude":-98.91},{"id":"iem_F_29.590_-98.950_1781938020000","source":"iem","severity":"low","severityValue":25,"timestamp":1781938020000,"latitude":29.59,"longitude":-98.95},{"id":"iem_F_29.420_-98.490_1781940300000","source":"iem","severity":"low","severityValue":25,"timestamp":1781940300000,"latitude":29.42,"longitude":-98.49}] |
Safety Information
During flooding: never walk, swim, or drive through floodwaters. Six inches of moving water can knock you down, and one foot of water can sweep away a vehicle. Move to higher ground if waters rise. After flooding, avoid contact with floodwater which may contain sewage, chemicals, or debris. Follow local emergency service guidance.
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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