Right now
The most recent data we hold from NOAA arrived 3 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 21 July 2026 at 21:30 UTC. It is kept here as a record.
It is the 13th strongest of the 55 detections recorded within 20 km of this point since 16 March 2026. Another comparable one was recorded here earlier the same day. 6 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued July 21 at 4:13PM EDT until July 21 at 5:30PM EDT by NWS Pittsburgh PA
Urban PEI: 61,493 within a heuristic 50 km radius; not unique people.
Nearby, since 16 March 2026
- July 21, 2026 · score 63 · 7.3 km
- August 11, 2026 · score 39 · 8.8 km
- September 21, 2026 · score 32 · 14.9 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 32 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) | 32 / 100 |
| Legacy data-support index | 0.79/1 |
| Coordinates | 39.3017, -82.8348 |
| Nearest City | Chillicothe (13 km) |
| Urban exposure index (PEI) | 61.5K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-21T20:13:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.4eef650dbd5123c3908bcbf939535436 |
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: 2026-07-21T20:13:00.000Z.
First archived: 2026-07-21T20:15:22.216Z. 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 | Belmont, OH; Guernsey, OH; Monroe, OH; Noble, OH; Marshall, WV; Belmont, OH; Greene, PA; Washington, PA; Marshall, WV; Guernsey, OH; Muskingum, OH; Noble, OH and 14 more areas |
| Headline | Flash Flood Warning issued July 21 at 4:13PM EDT until July 21 at 5:30PM EDT by NWS Pittsburgh PA |
| Expires | 2026-07-21T17:30:00-04:00 |
| SenderName | NWS Pittsburgh PA |
| HasExactCoords | true |
| MergedCount | 17 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.4eef650dbd5123c3908bcbf939535436c84d3b7d.001.1","noaa_urn:oid:2.49.0.1.840.0.9288b4cc0d26de424adb7c82b77ce5375d42c137.001.1","noaa_urn:oid:2.49.0.1.840.0.6fa39f1eaba3c7137e58aad436b96890c967468f.001.1","noaa_urn:oid:2.49.0.1.840.0.d938468713693cf4888ee93c414b46ba46c1f4f7.001.1","noaa_urn:oid:2.49.0.1.840.0.f5ae597e18c10174237a4c93fbb456ab2cc5bda9.001.1","noaa_urn:oid:2.49.0.1.840.0.8c99835d8990014637699ec5a63d52f9aa389c17.001.1","noaa_urn:oid:2.49.0.1.840.0.2dc8ac58896f23e88e92f3acb9a1c77bc398f055.001.1","noaa_urn:oid:2.49.0.1.840.0.13cc56e82b128f821a98b9b3c1c5f46e5805820a.001.1","noaa_urn:oid:2.49.0.1.840.0.d4597b6905f4a0d8362648f0a503c4164326f464.001.1","noaa_urn:oid:2.49.0.1.840.0.e6adb43ef6e3ff7a23b02a63d275df732405a626.001.1","noaa_urn:oid:2.49.0.1.840.0.f95988129381e5167a498f952b34befeccb3080f.001.1","noaa_urn:oid:2.49.0.1.840.0.5a551158688956705c21ebb2a192924fc5774f61.001.1","noaa_urn:oid:2.49.0.1.840.0.5df93be14fe24952fda9a22fa21180c2a92e6656.001.1","noaa_urn:oid:2.49.0.1.840.0.7b4605eb4063042b8e07d4d872ac99fd3044761d.001.1","noaa_urn:oid:2.49.0.1.840.0.5e6e8d96cd7e5c5a5a64309a15f0df4dd4d6cab6.001.1","noaa_urn:oid:2.49.0.1.840.0.b6c79cf56ca2339639ba564554451eeaece4bd84.001.1","noaa_urn:oid:2.49.0.1.840.0.dbafd5e2738a4a8f1f587f5ce0430780e8f263ba.001.1"] |
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.
Review the area, threshold and delivery channel in your account.
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