Right now
The most recent data we hold from NOAA arrived 5 minutes 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 05:34 UTC. It is kept here as a record.
It is the 7th strongest of the 34 detections recorded within 20 km of this point since 23 April 2026. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 17 at 12:24AM CDT until May 17 at 12:30AM CDT by NWS Omaha/Valley NE
Nearby, since 23 April 2026
- June 5, 2026 · score 22 · 2.3 km
- June 4, 2026 · score 22 · 2.3 km
- September 12, 2026 · score 28 · 4.0 km
How we know
8 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 | 0.71/1 |
| Coordinates | 40.0463, -96.1292 |
| Nearest City | Lincoln (95 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-05-17T05:24:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.b4ea9301db63a57422da12d7410eedd8 |
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: 2026-05-17T05:24:00.000Z.
First archived: 2026-05-17T05:29:05.930Z. 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 | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Nemaha, NE; Otoe, NE; Gage, NE; Jefferson, NE; Johnson, NE; Pawnee, NE; Gage, NE; Jefferson, NE; Johnson, NE; Otoe, NE; Saline, NE and 4 more areas |
| Headline | Severe Thunderstorm Warning issued May 17 at 12:24AM CDT until May 17 at 12:30AM CDT by NWS Omaha/Valley NE |
| Expires | 2026-05-17T00:34:00-05:00 |
| SenderName | NWS Omaha/Valley NE |
| HasExactCoords | true |
| MergedCount | 8 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.b4ea9301db63a57422da12d7410eedd81ecb60f1.001.1","noaa_urn:oid:2.49.0.1.840.0.5df797d9e571117acf6d7100d07ff9b897adcec6.001.1","noaa_urn:oid:2.49.0.1.840.0.e251b16a75c6b3f839d4d537f56cad7629dffb5c.001.1","noaa_urn:oid:2.49.0.1.840.0.7b1df3a4b53d38b89d79f1f8ebfbb3ca1e23e9ac.002.1","noaa_urn:oid:2.49.0.1.840.0.db7e6a895d35ea4fde4016e03b35f7ce906607a7.001.1","noaa_urn:oid:2.49.0.1.840.0.d2a0adc0e29dffef0a4a01f9d798d30744d37727.001.1","noaa_urn:oid:2.49.0.1.840.0.cb7fe1a96771699fd588607ae694e6bb90926ee1.001.1","noaa_urn:oid:2.49.0.1.840.0.be8955ce43018d1f9daf3050823e447080ccf66c.001.1"] |
| Iem TypeSummary | F |
| Iem City | 1 S Sterling |
| Iem County | Johnson |
| Iem State | NE |
| Iem Wfo | OAX |
| Iem Remark | Measured 3.10" so far. Flooding seen in fields and low lying areas. |
| MergedSources | [{"id":"iem_E_40.370_-96.610_1778986800000","source":"iem","severity":"low","severityValue":25,"timestamp":1778986800000,"latitude":40.37,"longitude":-96.61},{"id":"iem_E_40.470_-96.500_1778989020000","source":"iem","severity":"low","severityValue":25,"timestamp":1778989020000,"latitude":40.47,"longitude":-96.5},{"id":"iem_H_40.390_-96.880_1778981220000","source":"iem","severity":"low","severityValue":25,"timestamp":1778981220000,"latitude":40.39,"longitude":-96.88},{"id":"iem_F_40.460_-96.510_1778987760000","source":"iem","severity":"low","severityValue":25,"timestamp":1778987760000,"latitude":40.46,"longitude":-96.51},{"id":"iem_T_40.300_-96.640_1778984220000","source":"iem","severity":"low","severityValue":25,"timestamp":1778984220000,"latitude":40.3,"longitude":-96.64},{"id":"iem_E_40.410_-96.740_1778987880000","source":"iem","severity":"low","severityValue":25,"timestamp":1778987880000,"latitude":40.41,"longitude":-96.74},{"id":"iem_F_40.450_-96.380_1778992260000","source":"iem","severity":"low","severityValue":25,"timestamp":1778992260000,"latitude":40.45,"longitude":-96.38}] |
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.
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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