Flash Flood Warning issued August 29 at 5:38PM MST until August 29 at 8:45PM MST by NWS Tucson AZ
Geographic Context
This weather event occurred near Green Valley (approximately 25 km away) in United States, an area that experiences a range of natural hazards. An estimated 633.9K people live within 50 km of the event location, placing this in the "severe" population impact tier.
Event Assessment
This event is a weather event classified as high severity. Calamity.live has classified it as "high" severity with a severity value of 70. The computed Calamity Score is 54 out of 100, reflecting a moderate-impact event. The primary scoring components are: population (85), historical (80), intensity (50). Data for this event was sourced from noaa, one of the 196 scientific monitoring sources aggregated by Calamity.live.
Regional Monitoring Context
United States has a documented history of weather events. Monitoring for weather events in the region relies on a combination of ground-based sensors, satellite remote sensing, and official reporting from national agencies. The frequency and severity of such events are tracked over time to support risk assessment and emergency preparedness.
Event Data
| Type | Weather |
| Severity | high |
| Severity Value | 70 |
| Calamity Score | 54 / 100 |
| Confidence | 92% |
| Coordinates | 31.9147, -111.2396 |
| Nearest City | Green Valley (25 km) |
| Population Exposed | 633.9K within 50 km |
| Impact Tier | severe |
| Timestamp | 2026-08-30T00:38:00.000Z |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Pima, AZ; Pima, AZ; Santa Cruz, AZ |
| Headline | Flash Flood Warning issued August 29 at 5:38PM MST until August 29 at 8:45PM MST by NWS Tucson AZ |
| Expires | 2026-08-29T20:45:00-07:00 |
| SenderName | NWS Tucson AZ |
| HasExactCoords | true |
| MergedCount | 5 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.c2e2a8f165046ee43e7858c91209ff6b2a0f116c.001.1","noaa_urn:oid:2.49.0.1.840.0.3f04071089914fc687b07ac69f41856e1f454f72.001.1","noaa_urn:oid:2.49.0.1.840.0.c74c1341ba4f25905f1aef82af25cae10b0ccc7a.001.1","noaa_urn:oid:2.49.0.1.840.0.3d6cc68738d7f155a2aa8a79a7c8902377d53d94.001.1","noaa_urn:oid:2.49.0.1.840.0.4b71b3369c9c980131e7eeb7c96f2281190c4f58.001.1"] |
| Spc ReportType | wind |
| Spc Speed | UNK |
| Spc Location | 4 WSW Tucson |
| Spc County | Pima |
| Spc State | AZ |
| Spc Comments | Pole downed with loss of power to 1800 people. (TWC) |
| Iem TypeSummary | D |
| Iem Unit | |
| Iem City | 4 WSW Tucson |
| Iem County | Pima |
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.
This data is aggregated algorithmically from scientific sources. Not a replacement for official emergency warnings.
Calamity.live data shows a weather event with CalamityScore 54/100, near Green Valley (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 196 scientific monitoring sources.