METAR/SPECI uses the existing AviationWeather.gov bulk cache over the lower 48 and its margin. NWPS retains only gauges in the existing action-stage-or-above observed list; forecast-only gauges can have no observation. Absence never establishes zero wind, low water, or safe conditions.
Water-level gauge BLTM2
unavailable · No observation in the latest cached source list. Retained readings below are historical; an absent gauge may have fallen below action stage or stopped reporting.
Tide gauge (coastal water level) · Baltimore/Fort McHenry (IN MLLW) · Northwest Branch Patapsco River · -76.58, 39.27. Units ft; datum not supplied.
Source checked 2026-10-17 09:05:04.599Z · current.
Stage in this gauge’s units, not a regional flood depth. Tide/lake gauges remain water levels; datum is not supplied by this feed. Historical observations and the latest forecast keep separate times.
Retained observations: 0; target 24 hours, at most 96 reports per station. Recording began 2026-10-17 06:15:05.234Z; oldest available reading none.
No retained observations yet. Reload after the existing scheduled source pass runs.
NWS forecast · current
Highest listed forecast: 2.5 ft at 2026-10-19 05:00:00 UTC; issued 2026-10-16 18:30:00 UTC. Action stage.
Impacts and the full forecast are read for gauges in flood; this one is at action stage.
Gauge thresholds: action 2.5 ft; minor 3.4 ft; moderate 4.6 ft; major 6 ft.
Observed reports as a table (0)
| Observed (UTC) | Stage / units | Source category / water |
|---|---|---|
| No retained observations. | ||
Capture times, quality and provenance
Each report keeps its observation time, first capture of this version, and the SHA-256 of the source bulk body. Corrections at the same observation time replace that point and are marked; unrelated bulk-file changes do not freshen a report.
Only observed gauge records enter this history. Forecast maxima and forecast hydrograph points never become observations. A missing datum or unsupported flow value remains unknown.
Observation source page · Cached readings as JSON · Official source
Gauges in the latest cached source
7 total · source current; checked . Showing 7 on page 1. 0 gauges have suspect readings set aside.
- APAM2 · Annapolis (IN MLLW) · Tide gauge (coastal water level) · unavailable · no observation; forecast context only
- BISM2 · Bishops Head (IN MLLW) · Tide gauge (coastal water level) · unavailable · no observation; forecast context only
- BLTM2 · Baltimore/Fort McHenry (IN MLLW) · Tide gauge (coastal water level) · unavailable · no observation; forecast context only
- CRSM2 · Little Annemessex River at Crisfield MD (MLLW) · Tide gauge (coastal water level) · unavailable · no observation; forecast context only
- OCIM2 · OCEAN CITY INLET (IN MLLW) · Tide gauge (coastal water level) · unavailable · no observation; forecast context only
- SGSM2 · Straits Point (IN MLLW) · Tide gauge (coastal water level) · unavailable · no observation; forecast context only
- SLIM2 · Solomons Island (IN MLLW) · Tide gauge (coastal water level) · unavailable · no observation; forecast context only