Right now
The most recent data we hold from NOAA arrived 4 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 10 July 2026 at 02:00 UTC. It is kept here as a record.
It is the 79th strongest of the 294 detections recorded within 20 km of this point since 11 March 2026. Another comparable one was recorded here earlier the same day. 18 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Watch issued July 9 at 5:50PM EDT until July 9 at 10:00PM EDT by NWS Baltimore MD/Washington DC
Urban PEI: 683,111 within a heuristic 50 km radius; not unique people.
Nearby, since 11 March 2026
- July 9, 2026 · score 48 · 0.0 km
- June 6, 2026 · score 48 · 0.0 km
- June 23, 2026 · score 52 · 2.4 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 48 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) | 48 / 100 |
| Legacy data-support index | 0.80/1 |
| Coordinates | 39.0000, -76.1600 |
| Nearest City | Easton (26 km) |
| Urban exposure index (PEI) | 683.1K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-09T21:50:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Watch_noaa_urn:oid:2.49.0.1.840.0.7166a3eb4df9bdcae00a62a7e413f852 |
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: 2026-07-09T21:50:00.000Z.
First archived: 2026-07-09T22:54:37.883Z. 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 Watch |
| Urgency | Future |
| Certainty | Possible |
| AreaDesc | Chesapeake Bay north of Pooles Island MD; Chesapeake Bay from Pooles Island to Sandy Point MD; Chesapeake Bay from Sandy Point to North Beach MD; Chesapeake Bay from North Beach to Drum Point MD; Chesapeake Bay from Drum Point MD to Smith Point VA; Tidal Potomac from Key Bridge to Indian Head MD; Tidal Potomac from Indian Head to Cobb Island MD; Tidal Potomac from Cobb Island MD to Smith Point VA; Patapsco River including Baltimore Harbor; Chester River to Queenstown MD; Eastern Bay; Choptank River to Cambridge MD and the Little Choptank River; Patuxent River to Broomes Island MD; Tangier Sound and the inland waters surrounding Bloodsworth Island; District of Columbia, DC; Anne Arundel, MD; Baltimore, MD; Calvert, MD; Carroll, MD; Cecil, MD; Charles, MD; Harford, MD; Howard, MD; Montgomery, MD; Prince Georges, MD; St. Marys, MD; Baltimore City, MD; Arlington, VA; Fairfax, VA; King George, VA; Prince William, VA; Spotsylvania, VA; Stafford, VA; City of Alexandria, VA; City of Fairfax, VA; City of Falls Church, VA; City of Fredericksburg, VA; City of Manassas, VA; City of Manassas Park, VA; Dorchester, MD; Somerset, MD; Wicomico, MD; Worcester, MD; Accomack, VA; Caroline, VA; Essex, VA; Fluvanna, VA; Goochland, VA; Hanover, VA; Henrico, VA; King and Queen, VA; King William, VA; Lancaster, VA; Louisa, VA; Middlesex, VA; New Kent, VA; Northumberland, VA; Richmond, VA; Westmoreland, VA; City of Richmond, VA and 2 more areas |
| Headline | Severe Thunderstorm Watch issued July 9 at 5:50PM EDT until July 9 at 10:00PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-07-09T22:00:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | false |
| MergedCount | 5 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.7166a3eb4df9bdcae00a62a7e413f852a1530515.003.1","noaa_urn:oid:2.49.0.1.840.0.7166a3eb4df9bdcae00a62a7e413f852a1530515.002.1","noaa_urn:oid:2.49.0.1.840.0.51046ec97f539940cff3eb2b4f89bfc5b5f12368.001.1","noaa_urn:oid:2.49.0.1.840.0.e45d2e407135920f116b7f05f1947e15b2556429.001.1","noaa_urn:oid:2.49.0.1.840.0.e45d2e407135920f116b7f05f1947e15b2556429.002.1"] |
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.
Review the area, threshold and delivery channel in your account.
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