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.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 17 May 2026 at 05:15 UTC. It is kept here as a record.
It is the 11th strongest of the 35 detections recorded within 20 km of this point since 15 March 2026. Another comparable one was recorded here earlier the same day. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued May 16 at 9:22PM CDT until May 17 at 12:15AM CDT by NWS Omaha/Valley NE
How we know
15 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 22 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) | 22 / 100 |
| Legacy data-support index | 0.69/1 |
| Coordinates | 40.3761, -94.6865 |
| Nearest City | Saint Joseph (69 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-05-17T02:22:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.5c1002137f3e1e11e6fef2d5f40fd50e |
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: 2026-05-17T02:22:00.000Z.
First archived: 2026-05-17T02:34:41.149Z. 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 | Gage, NE; Montgomery, IA; Grundy, MO; Harrison, MO; Mercer, MO and 1 more areas |
| Headline | Flash Flood Warning issued May 16 at 9:22PM CDT until May 17 at 12:15AM CDT by NWS Omaha/Valley NE |
| Expires | 2026-05-17T00:15:00-05:00 |
| SenderName | NWS Omaha/Valley NE |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.5c1002137f3e1e11e6fef2d5f40fd50e8481d75a.001.1","noaa_urn:oid:2.49.0.1.840.0.bcd55fd61c688490e15805572c6db9a0a01c456e.001.1","noaa_urn:oid:2.49.0.1.840.0.24555793b3a1ba8cc09263b5206952b754bbeef2.001.1","noaa_urn:oid:2.49.0.1.840.0.fb7039eeef1e3d59b61155bb114362e013aa1b14.001.1"] |
| Iem TypeSummary | H |
| Iem Magnitude | 2 |
| Iem Unit | Inch |
| Iem City | 2 N Gravity |
| Iem County | Taylor |
| Iem State | IA |
| Iem Wfo | DMX |
| Iem Remark | Via Spotter Network. |
| MergedSources | [{"id":"iem_H_40.940_-95.100_1778967180000","source":"iem","severity":"low","severityValue":25,"timestamp":1778967180000,"latitude":40.94,"longitude":-95.1},{"id":"iem_H_40.790_-94.740_1778971500000","source":"iem","severity":"low","severityValue":25,"timestamp":1778971500000,"latitude":40.79,"longitude":-94.74},{"id":"iem_H_40.250_-94.330_1778980260000","source":"iem","severity":"low","severityValue":25,"timestamp":1778980260000,"latitude":40.25,"longitude":-94.33},{"id":"iem_T_40.750_-94.760_1778971860000","source":"iem","severity":"low","severityValue":25,"timestamp":1778971860000,"latitude":40.75,"longitude":-94.76},{"id":"iem_G_40.980_-94.980_1778967900000","source":"iem","severity":"low","severityValue":25,"timestamp":1778967900000,"latitude":40.98,"longitude":-94.98},{"id":"iem_H_40.860_-94.770_1778970660000","source":"iem","severity":"low","severityValue":25,"timestamp":1778970660000,"latitude":40.86,"longitude":-94.77},{"id":"iem_H_40.710_-94.250_1778976840000","source":"iem","severity":"low","severityValue":25,"timestamp":1778976840000,"latitude":40.71,"longitude":-94.25},{"id":"iem_H_40.710_-94.240_1778976360000","source":"iem","severity":"low","severityValue":25,"timestamp":1778976360000,"latitude":40.71,"longitude":-94.24},{"id":"iem_T_40.750_-94.730_1778972040000","source":"iem","severity":"low","severityValue":25,"timestamp":1778972040000,"latitude":40.75,"longitude":-94.73},{"id":"iem_H_40.240_-94.320_1778981100000","source":"iem","severity":"low","severityValue":25,"timestamp":1778981100000,"latitude":40.24,"longitude":-94.32},{"id":"iem_H_40.520_-94.610_1778976960000","source":"iem","severity":"low","severityValue":25,"timestamp":1778976960000,"latitude":40.52,"longitude":-94.61},{"id":"iem_H_40.800_-94.890_1778969400000","source":"iem","severity":"low","severityValue":25,"timestamp":1778969400000,"latitude":40.8,"longitude":-94.89},{"id":"iem_H_40.720_-94.730_1778974080000","source":"iem","severity":"low","severityValue":25,"timestamp":1778974080000,"latitude":40.72,"longitude":-94.73},{"id":"iem_H_40.790_-94.740_1778971560000","source":"iem","severity":"low","severityValue":25,"timestamp":1778971560000,"latitude":40.79,"longitude":-94.74}] |
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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