Right now
The most recent data we hold from NOAA arrived 1 minute 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 6 July 2026 at 02:00 UTC. It is kept here as a record.
It is the 16th strongest of the 262 detections recorded within 20 km of this point since 11 March 2026. The last comparable one was on 5 July 2026. 19 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued July 5 at 8:00PM EDT until July 5 at 10:00PM EDT by NWS Baltimore MD/Washington DC
Urban PEI: 4,788,930 within a heuristic 50 km radius; not unique people.
Nearby, since 11 March 2026
- July 6, 2026 · score 52 · 0.0 km
- July 28, 2026 · score 52 · 2.4 km
- July 9, 2026 · score 52 · 3.0 km
How we know
13 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 52 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) | 52 / 100 |
| Legacy data-support index | 0.89/1 |
| Coordinates | 38.9145, -76.6918 |
| Nearest City | Bowie (4 km) |
| Urban exposure index (PEI) | 4.8M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-06T00:00:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.a63cf49d7164a522f938fae7adce0fc5 |
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: 2026-07-06T00:00:00.000Z.
First archived: 2026-07-06T01:11:45.919Z. 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 | 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; Eastern Bay; Choptank River to Cambridge MD and the Little Choptank River; Tidal Potomac from Key Bridge to Indian Head MD; Tidal Potomac from Indian Head to Cobb Island MD |
| Headline | Special Marine Warning issued July 5 at 8:00PM EDT until July 5 at 10:00PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-07-05T22:00:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.a63cf49d7164a522f938fae7adce0fc5ddc686a9.001.1","noaa_urn:oid:2.49.0.1.840.0.f0755f5b2d79aa799a9288e6745ab89a363b3a7b.001.1"] |
| Iem TypeSummary | E |
| Iem City | 3 E Laytonsville |
| Iem County | Montgomery |
| Iem State | MD |
| Iem Wfo | LWX |
| Iem Remark | Montgomery County stream gauge reached minor flood stage along the Hawlings River at 22000 Zion Road. |
| MergedSources | [{"id":"iem_D_39.150_-77.050_1783294020000","source":"iem","severity":"low","severityValue":25,"timestamp":1783294020000,"latitude":39.15,"longitude":-77.05},{"id":"iem_D_39.160_-77.050_1783291380000","source":"iem","severity":"low","severityValue":25,"timestamp":1783291380000,"latitude":39.16,"longitude":-77.05},{"id":"iem_D_39.230_-77.120_1783290960000","source":"iem","severity":"low","severityValue":25,"timestamp":1783290960000,"latitude":39.23,"longitude":-77.12},{"id":"iem_D_38.970_-77.340_1783294500000","source":"iem","severity":"low","severityValue":25,"timestamp":1783294500000,"latitude":38.97,"longitude":-77.34},{"id":"iem_D_38.980_-77.380_1783294680000","source":"iem","severity":"low","severityValue":25,"timestamp":1783294680000,"latitude":38.98,"longitude":-77.38},{"id":"iem_G_39.180_-77.100_1783292760000","source":"iem","severity":"low","severityValue":25,"timestamp":1783292760000,"latitude":39.18,"longitude":-77.1},{"id":"iem_D_39.220_-77.060_1783291560000","source":"iem","severity":"low","severityValue":25,"timestamp":1783291560000,"latitude":39.22,"longitude":-77.06},{"id":"iem_D_39.170_-77.060_1783293660000","source":"iem","severity":"low","severityValue":25,"timestamp":1783293660000,"latitude":39.17,"longitude":-77.06},{"id":"iem_E_39.190_-77.040_1783297080000","source":"iem","severity":"low","severityValue":25,"timestamp":1783297080000,"latitude":39.19,"longitude":-77.04},{"id":"iem_D_38.960_-77.350_1783294500000","source":"iem","severity":"low","severityValue":25,"timestamp":1783294500000,"latitude":38.96,"longitude":-77.35},{"id":"iem_F_39.210_-77.090_1783297980000","source":"iem","severity":"low","severityValue":25,"timestamp":1783297980000,"latitude":39.21,"longitude":-77.09},{"id":"iem_E_39.210_-77.090_1783298220000","source":"iem","severity":"low","severityValue":25,"timestamp":1783298220000,"latitude":39.21,"longitude":-77.09}] |
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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