Data health

Storm Mode / Observations

Station and river observations

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 AXTV2

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.

River gauge · Alexandria · Potomac River · -77.03833300000001, 38.805278. Units ft; datum not supplied.

Source checked 2026-10-17 09:55:04.711Z · 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: 2; target 24 hours, at most 96 reports per station. Recording began 2026-10-17 06:15:05.234Z; oldest available reading 2026-10-17 05:00:00 UTC.

Observed stage and separate NWS forecast at AXTV2 (ft)Dots are retained observations. Lines break for missing fields, long intervals or changed station location or units. 0 recorded discontinuities. Dashed lines, when present, are the separately issued NWS forecast.3.71.6ft10-17 05:00Z10-17 06:00Z2026-10-17 05:00:00 UTC · 2.67 ft2026-10-17 05:12:00 UTC · 2.63 ft
Observed stage and separate NWS forecast · 2 retained observations; 0 discontinuities. Lines join reported values only; missing intervals are not interpolated.

NWS forecast · current

Highest listed forecast: 3 ft at 2026-10-19 18:00:00 UTC; issued 2026-10-17 01:27:00 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 3.3 ft; moderate 4.2 ft; major 6.6 ft.

Observed reports as a table (2)
Observed (UTC)Stage / unitsSource category / water
2026-10-17 05:00:00 UTC2.67 ftAction stage · Tide gauge (coastal water level)
2026-10-17 05:12:00 UTC2.63 ftAction stage · Tide gauge (coastal water level)
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.

  • Observed 2026-10-17 05:00:00 UTC, captured 2026-10-17 06:15:05.234Z; source body SHA-256 59def4ab364727656cb6987939ba27a3a22ae792b74344565dc73a5086b5ca2b.
  • Observed 2026-10-17 05:12:00 UTC, captured 2026-10-17 06:25:04.966Z; source body SHA-256 a55d6ab71db55a2ee8a268331c449d3fbde4abd1e4608ff87b0cd2cbc8b1e784.

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

114 total · source current; checked . Showing 100 on page 1. 0 gauges have suspect readings set aside.

Source status · Storm Mode