Right now
The most recent data we hold from NOAA arrived 50 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 12 June 2026 at 04:00 UTC. It is kept here as a record.
It is the 91st strongest of the 263 detections recorded within 20 km of this point since 11 March 2026. The last comparable one was on 6 June 2026. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Watch issued June 11 at 7:15PM EDT until June 12 at 12:00AM EDT by NWS Baltimore MD/Washington DC
Urban PEI: 1,268,819 within a heuristic 50 km radius; not unique people.
Nearby, since 11 March 2026
- June 23, 2026 · score 52 · 0.0 km
- July 9, 2026 · score 48 · 2.4 km
- June 6, 2026 · score 48 · 2.4 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 46 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) | 46 / 100 |
| Legacy data-support index | 0.80/1 |
| Coordinates | 39.0000, -76.1875 |
| Nearest City | Annapolis (26 km) |
| Urban exposure index (PEI) | 1.3M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-11T23:15:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Watch_noaa_urn:oid:2.49.0.1.840.0.17db93082de367b347bba9c0bef781f2 |
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: 2026-06-11T23:15:00.000Z.
First archived: 2026-06-11T23:22:23.177Z. 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 | Calvert, MD; Cecil, MD; Charles, MD; St. Marys, MD; King George, VA; Stafford, VA; Delaware Bay waters north of East Point NJ to Slaughter Beach DE; Delaware Bay waters south of East Point NJ to Slaughter Beach DE; Coastal waters from Sandy Hook to Manasquan Inlet NJ out 20 NM; Coastal waters from Manasquan Inlet to Little Egg Inlet NJ out 20 NM; Coastal waters from Little Egg Inlet to Great Egg Inlet NJ out 20 NM; Coastal waters from Great Egg Inlet to Cape May NJ out 20 NM; Coastal waters from Cape May NJ to Cape Henlopen DE out 20 NM; Coastal waters from Cape Henlopen to Fenwick Island DE out 20 NM; Chesapeake Bay from North Beach to Drum Point MD; Chesapeake Bay from Drum Point MD to Smith Point VA; Tidal Potomac from Indian Head to Cobb Island MD; Tidal Potomac from Cobb Island MD to Smith Point VA; 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 and 5 more areas |
| Headline | Severe Thunderstorm Watch issued June 11 at 7:15PM EDT until June 12 at 12:00AM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-06-12T00:00:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | false |
| MergedCount | 8 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.17db93082de367b347bba9c0bef781f20d00ffa5.002.1","noaa_urn:oid:2.49.0.1.840.0.7b9a8257bc60e3d62cfdb1de0feb22c05f972f92.002.1","noaa_urn:oid:2.49.0.1.840.0.17db93082de367b347bba9c0bef781f20d00ffa5.003.1","noaa_urn:oid:2.49.0.1.840.0.7b9a8257bc60e3d62cfdb1de0feb22c05f972f92.001.1","noaa_urn:oid:2.49.0.1.840.0.17db93082de367b347bba9c0bef781f20d00ffa5.004.1","noaa_urn:oid:2.49.0.1.840.0.17db93082de367b347bba9c0bef781f20d00ffa5.005.1","noaa_urn:oid:2.49.0.1.840.0.52210a5c82bfe0e0c12fcf280b3528dcdd476a7c.001.1","noaa_urn:oid:2.49.0.1.840.0.52210a5c82bfe0e0c12fcf280b3528dcdd476a7c.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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