What does a frozen record contain?

Each record starts with the word RECORD and its ten-character id, the place name, then the area and the latitude and longitude to four decimal places, followed by the persona the record was made under. Below that, Issued gives the exact time the record was created, with the note not a live forecast, and Forecast hour gives the hour the figures apply to, in site-local time. Two buttons sit beside the header. Share uses your device's share sheet or copies the link, and Packet downloads the record as a JSON file.

The Recorded wind readout shows speed, direction, the 10 m gust, the height it applies to and, when a limit was set, P(>limit). If the working height was not 10 m, the speed is the value at that height and a note says whether it was interpolated or extrapolated. Beside it is a lamp, GO, WATCH or STOP, with a verdict phrase such as Candidate lift window or Playable. Speeds are shown in the usual unit for the persona the record was made under, not the unit the viewer prefers. Under it, a wind profile drawing shows the 80, 120 and 180 m levels.

The block under the main figures holds the verdict, a one-sentence summary, a recommendation, a THRESHOLD line and a short list of drivers. It comes from the persona's own impact check on the 10 m hourly data. For crane, drone, marine, motorsport and event personas, it compares the 10 m gust with the limit you had set: GO with a margin of at least 8 mph, WATCH inside that margin, STOP above the limit. Golf and spray use their own bands, so the golf verdict does not use your limit. The THRESHOLD line states the number used. If no limit was set, it reads No user limit set and a default planning value is used, which the drivers list says. The record does not store who set the limit.

When the record holds several ensemble hours, you see the FROZEN EXCEEDANCE FAN, drawn from those hours with your limit as a line. When it holds one hour, you see ENSEMBLE AT THE RECORDED HOUR with the P10, P50 and P90 speeds and P(EXCEED), followed by the member count and the model names. P(EXCEED) is the fraction of ensemble members at or above the limit, shown as a percentage, and it reads UNKNOWN when no probability was available. If the ensemble was not captured, the page says ENSEMBLE · not in the packet. See Read the exceedance fan.

The ENVELOPE line shows one of INSIDE ENVELOPE, WATCH, OUTSIDE ENVELOPE or UNKNOWN, with the compared value, the method and the reasons. It compares the modelled value at the working height with your limit, using the same rules as the instrument lamp. It is not a preset range of acceptable conditions. The value is outside when it exceeds the limit, and watch when it is within 5 mph or when enough ensemble members are over the limit. The envelope uses gust only at 10 m, and mean speed at other heights. The verdict and the envelope are worked out separately, so they can differ.

The observation line reports the nearest station at the time of freezing, as METAR or NDBC with the station id, its age in minutes, its speed, its distance in kilometres and the model's 10 m speed for the same hour. This is a measurement from the station, not a model value, and it can sit some distance from your site. If no usable station was found, the line reads OBSERVATION · not in the packet. See Observations versus the model.

The PROVENANCE table lists where the figures came from, including forecast source and models, fetch time, site timezone, valid time and the issue note, up to 16 entries. If extra evidence was attached, a line below it begins Evidence attached. Two links finish the page: Open live in The Wind Agent loads the instrument at the same place, height and limit, and Public board opens the compact embed view of this record. The foot of the page repeats that the record is a frozen modelled forecast and not an on-site observation. For where the data comes from, read Where the data comes from.