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 5 July 2026 at 02:00 UTC. It is kept here as a record.
It is the 11th strongest of the 181 detections recorded within 20 km of this point since 17 March 2026. Another comparable one was recorded here earlier the same day. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Watch issued July 4 at 8:33PM EDT until July 4 at 10:00PM EDT by NWS Baltimore MD/Washington DC
Urban PEI: 116,699 within a heuristic 50 km radius; not unique people.
Nearby, since 17 March 2026
- June 10, 2026 · score 37 · 4.5 km
- June 15, 2026 · score 43 · 6.0 km
- June 10, 2026 · score 37 · 7.6 km
How we know
2 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 43 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) | 43 / 100 |
| Legacy data-support index | 0.84/1 |
| Coordinates | 39.1857, -75.8286 |
| Nearest City | Dover (27 km) |
| Urban exposure index (PEI) | 116.7K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-05T00:33:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Watch_noaa_urn:oid:2.49.0.1.840.0.451395b43d9c1a84c3f35482fede8570 |
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: 2026-07-05T00:33:00.000Z.
First archived: 2026-07-05T00:39:45.124Z. 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; 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; Chesapeake Bay from Smith Point to Windmill Point VA; Coastal waters from Fenwick Island DE to Chincoteague VA out 20 NM and 4 more areas |
| Headline | Severe Thunderstorm Watch issued July 4 at 8:33PM EDT until July 4 at 10:00PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-07-04T22:00:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | false |
| MergedCount | 7 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.451395b43d9c1a84c3f35482fede857081d2b9d7.003.1","noaa_urn:oid:2.49.0.1.840.0.451395b43d9c1a84c3f35482fede857081d2b9d7.002.1","noaa_urn:oid:2.49.0.1.840.0.cb47b98572f9e735448561b6179f42ae450a4853.002.1","noaa_urn:oid:2.49.0.1.840.0.cb47b98572f9e735448561b6179f42ae450a4853.001.1","noaa_urn:oid:2.49.0.1.840.0.eeb12aa6f8383a9df0dd3e74cbd1263285ed4d52.001.1","noaa_urn:oid:2.49.0.1.840.0.eeb12aa6f8383a9df0dd3e74cbd1263285ed4d52.002.1","noaa_urn:oid:2.49.0.1.840.0.974e011e43064ff856343b01691ad6a5ef024d27.003.1"] |
| Iem TypeSummary | D |
| Iem City | 1 SSE Timonium |
| Iem County | Baltimore |
| Iem State | MD |
| Iem Wfo | LWX |
| Iem Remark | Two trees down. |
| MergedSources | [{"id":"iem_D_39.420_-76.610_1783207860000","source":"iem","severity":"low","severityValue":25,"timestamp":1783207860000,"latitude":39.42,"longitude":-76.61}] |
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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