Right now
The most recent data we hold from NOAA arrived 6 hours 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 01:15 UTC. It is kept here as a record.
It is the 69th strongest of the 279 detections recorded within 20 km of this point since 17 March 2026. Another comparable one was recorded here earlier the same day. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued July 4 at 7:20PM EDT until July 4 at 9:15PM EDT by NWS Baltimore MD/Washington DC
Urban PEI: 625,796 within a heuristic 50 km radius; not unique people.
Nearby, since 17 March 2026
- July 5, 2026 · score 48 · 4.4 km
- September 2, 2026 · score 37 · 6.1 km
- August 2, 2026 · score 37 · 7.4 km
How we know
6 recorded sources include NOAA; independence is not established by this count.
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 | 0.89/1 |
| Coordinates | 38.7185, -76.3875 |
| Nearest City | Easton (27 km) |
| Urban exposure index (PEI) | 625.8K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-04T23:20:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.94cd82fd3313d641826dd02d388a108c |
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: 2026-07-04T23:20:00.000Z.
First archived: 2026-07-04T23:36:42.165Z. 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 | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Tidal Potomac from Key Bridge to Indian Head MD; Tidal Potomac from Indian Head to Cobb Island MD; 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; Patapsco River including Baltimore Harbor; Chester River to Queenstown MD; Tidal Potomac from Indian Head to Cobb Island MD and 2 more areas |
| Headline | Special Marine Warning issued July 4 at 7:20PM EDT until July 4 at 9:15PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-07-04T21:15:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| MergedCount | 5 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.94cd82fd3313d641826dd02d388a108cd3618a62.001.1","noaa_urn:oid:2.49.0.1.840.0.ad5d69b42c7061da938b6aab421b08a5dab85e1e.001.1","noaa_urn:oid:2.49.0.1.840.0.065947f712cae25f598eeab37f26c1f62255aad4.001.1","noaa_urn:oid:2.49.0.1.840.0.e85c90d038859debabb07de15db6e9922f44232f.001.1","noaa_urn:oid:2.49.0.1.840.0.331f3a4b944f799598eaadf2f6a479815eaeb569.002.1"] |
| Iem TypeSummary | M |
| Iem Magnitude | 45 |
| Iem Unit | mph |
| Iem City | 2 E Woodbridge |
| Iem County | ANZ536 |
| Iem State | VA |
| Iem Wfo | LWX |
| Iem Remark | Wind gusts of up to 45 knots (52 MPH) were measured by the Occoquan River WeatherFlow sensor (XOCC) between 6:06 and 6:41 PM. |
| MergedSources | [{"id":"iem_M_38.850_-77.030_1783204320000","source":"iem","severity":"low","severityValue":25,"timestamp":1783204320000,"latitude":38.85,"longitude":-77.03},{"id":"iem_M_38.310_-76.930_1783203780000","source":"iem","severity":"low","severityValue":25,"timestamp":1783203780000,"latitude":38.31,"longitude":-76.93},{"id":"iem_M_38.310_-77.000_1783203840000","source":"iem","severity":"low","severityValue":25,"timestamp":1783203840000,"latitude":38.31,"longitude":-77},{"id":"iem_M_38.340_-76.990_1783204080000","source":"iem","severity":"low","severityValue":25,"timestamp":1783204080000,"latitude":38.34,"longitude":-76.99},{"id":"iem_M_38.640_-77.220_1783202760000","source":"iem","severity":"low","severityValue":25,"timestamp":1783202760000,"latitude":38.64,"longitude":-77.22}] |
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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