This alert is in force until 2 September 2026, 14:30 UTC.
It is the 2nd strongest of the 18 detections recorded within 20 km of this point since 10 May 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Flash Flood Warning issued September 2 at 7:37AM CDT until September 2 at 9:30AM CDT by NWS Houston/Galveston TX
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 16 out of 100, at 66 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 16 / 100 |
| Our confidence | 66% |
| Coordinates | 30.4077, -94.7196 |
| Nearest City | New Caney (55 km) |
| Impact Tier | minor |
| Timestamp | 2026-09-02T12:37:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.40047fd73acddfecbed51a15ce9f1ecb1653a7d4.001.1 |
Score Breakdown
35
intensity
0
population
0
cascading
18
historical
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Polk, TX; San Jacinto, TX; Liberty, TX; Montgomery, TX; San Jacinto, TX; Liberty, TX and 2 more areas |
| Headline | Flash Flood Warning issued September 2 at 7:37AM CDT until September 2 at 9:30AM CDT by NWS Houston/Galveston TX |
| Expires | 2026-09-02T09:30:00-05:00 |
| SenderName | NWS Houston/Galveston TX |
| HasExactCoords | true |
| MergedCount | 5 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.40047fd73acddfecbed51a15ce9f1ecb1653a7d4.001.1","noaa_urn:oid:2.49.0.1.840.0.4339d5021c6a4dc166fa6e7e9d85046b9d3bce21.001.1","noaa_urn:oid:2.49.0.1.840.0.af59506613effefc79ee1f769342de54f253afd7.001.1","noaa_urn:oid:2.49.0.1.840.0.105ff6f31d4c52c482c749264b95d4b0871a43e3.001.1","noaa_urn:oid:2.49.0.1.840.0.ae10567aad738f04f29107c51737f4ef7df78c78.001.1"] |
| Iem TypeSummary | R |
| Iem Magnitude | 3.23 |
| Iem Unit | Inch |
| Iem City | 5 E China |
| Iem County | Jefferson |
| Iem State | TX |
| Iem Wfo | LCH |
| MergedSources | 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|
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.
Want to know when something happens in this area?
Calamity.live data shows a weather event with CalamityScore 16/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.