This alert expired on 11 August 2026 at 09:45 UTC. It is kept here as a record.
No stronger detection stands among the 62 recorded within 20 km of this point since 12 March 2026 — 10 others scored the same. Another comparable one was recorded here earlier the same day. 13 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued August 11 at 12:49AM EDT until August 11 at 5:45AM EDT by NWS Cleveland OH
An estimated 139,670 people live within 50 km of this point.
Nearby, since 12 March 2026
- March 12, 2026 · score 39 · 6.4 km
- July 18, 2026 · score 43 · 12.6 km
- August 10, 2026 · score 39 · 12.9 km
How we know
Confirmed by 19 independent sources, including NOAA.
Our own score for this event is 43 out of 100, at 91 % 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 | 91% |
| Coordinates | 41.3757, -82.7707 |
| Nearest City | Sandusky (10 km) |
| Population Exposed | 139.7K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-11T04:49:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.3185ec55f7502bde99b64890330abccddbdcbf7c.001.1 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Erie, OH |
| Headline | Flash Flood Warning issued August 11 at 12:49AM EDT until August 11 at 5:45AM EDT by NWS Cleveland OH |
| Expires | 2026-08-11T05:45:00-04:00 |
| SenderName | NWS Cleveland OH |
| HasExactCoords | true |
| Iem TypeSummary | M |
| Iem Magnitude | 50 |
| Iem Unit | MPH |
| Iem City | 2 NE Fairview Lanes |
| Iem County | Erie |
| Iem State | OH |
| Iem Wfo | CLE |
| Iem Remark | Mesonet station AU939 Sandusky gust to 43 knots. |
| MergedSources | [{"id":"iem_D_40.750_-82.530_1786420320000","source":"iem","severity":"low","severityValue":25,"timestamp":1786420320000,"latitude":40.75,"longitude":-82.53},{"id":"iem_D_40.970_-82.360_1786422420000","source":"iem","severity":"low","severityValue":25,"timestamp":1786422420000,"latitude":40.97,"longitude":-82.36},{"id":"iem_D_40.860_-82.770_1786419780000","source":"iem","severity":"low","severityValue":25,"timestamp":1786419780000,"latitude":40.86,"longitude":-82.77},{"id":"iem_G_40.760_-82.530_1786421700000","source":"iem","severity":"low","severityValue":25,"timestamp":1786421700000,"latitude":40.76,"longitude":-82.53},{"id":"iem_M_41.490_-82.700_1786423800000","source":"iem","severity":"low","severityValue":25,"timestamp":1786423800000,"latitude":41.49,"longitude":-82.7},{"id":"iem_D_40.840_-83.090_1786418940000","source":"iem","severity":"low","severityValue":25,"timestamp":1786418940000,"latitude":40.84,"longitude":-83.09},{"id":"iem_E_40.760_-82.530_1786421700000","source":"iem","severity":"low","severityValue":25,"timestamp":1786421700000,"latitude":40.76,"longitude":-82.53},{"id":"iem_D_40.880_-82.210_1786422420000","source":"iem","severity":"low","severityValue":25,"timestamp":1786422420000,"latitude":40.88,"longitude":-82.21},{"id":"iem_D_40.830_-83.280_1786417920000","source":"iem","severity":"low","severityValue":25,"timestamp":1786417920000,"latitude":40.83,"longitude":-83.28},{"id":"iem_D_41.360_-82.480_1786423200000","source":"iem","severity":"low","severityValue":25,"timestamp":1786423200000,"latitude":41.36,"longitude":-82.48},{"id":"iem_M_41.430_-82.360_1786424580000","source":"iem","severity":"low","severityValue":25,"timestamp":1786424580000,"latitude":41.43,"longitude":-82.36},{"id":"iem_D_40.810_-82.980_1786419300000","source":"iem","severity":"low","severityValue":25,"timestamp":1786419300000,"latitude":40.81,"longitude":-82.98},{"id":"iem_D_40.870_-82.310_1786421220000","source":"iem","severity":"low","severityValue":25,"timestamp":1786421220000,"latitude":40.87,"longitude":-82.31},{"id":"iem_D_41.390_-82.670_1786422540000","source":"iem","severity":"low","severityValue":25,"timestamp":1786422540000,"latitude":41.39,"longitude":-82.67},{"id":"iem_M_41.430_-82.360_1786425000000","source":"iem","severity":"low","severityValue":25,"timestamp":1786425000000,"latitude":41.43,"longitude":-82.36},{"id":"iem_D_40.990_-82.370_1786422420000","source":"iem","severity":"low","severityValue":25,"timestamp":1786422420000,"latitude":40.99,"longitude":-82.37},{"id":"iem_D_41.100_-82.660_1786420860000","source":"iem","severity":"low","severityValue":25,"timestamp":1786420860000,"latitude":41.1,"longitude":-82.66},{"id":"iem_M_41.440_-82.640_1786423860000","source":"iem","severity":"low","severityValue":25,"timestamp":1786423860000,"latitude":41.44,"longitude":-82.64}] |
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 near Sandusky?
Calamity.live data shows a weather event with CalamityScore 43/100, near Sandusky (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.