Keep the unit next to the number
The Met Office explains a knot as a nautical mile per hour and gives approximate equivalents of 0.51 metres per second or 1.15 miles per hour. A displayed twenty knots therefore does not mean twenty kilometres per hour or twenty mph. Use the source’s labelled unit and a suitable conversion when a comparison is needed. Do not infer the unit only from the broadcaster’s language: weather systems can offer alternative display settings, and a reused clip may retain another service’s graphics.
Separate Beaufort force from a speed unit
The Met Office’s Beaufort table maps force categories to speed ranges and descriptive terms. A force-six label is a category, not six knots or six kilometres per hour. If the graphic uses a Beaufort number, consult the relevant table rather than inserting the number into a speed converter. Keep the category and its stated context with the report. A sea-state illustration or wave-height range also should not be treated as a precise measurement of every nearby beach or harbour.
Read direction and gust labels explicitly
In the Met Office’s measurement explanation, an easterly wind comes from the east. It does not mean air moving toward the east. Preserve the direction label with the number. Distinguish a reported average from a gust value before comparing two broadcasts; a gust and a mean can differ without either graphic being wrong. Open the original weather service’s explanation if an unfamiliar abbreviation appears. A short television caption may omit the averaging period or observation context.
Keep forecast validity separate from upload time
Record the location, issue time and forecast period, not just the date a clip was uploaded. A forecast for tomorrow in the source location may concern a different Canadian calendar date, and an old warning can remain online after it expires. For travel or safety decisions, use the current official local weather service rather than this unit-reading explanation or an archived television clip. Clear units help interpret the message, but they do not make an old forecast current or establish conditions at a different location.
Related questions
Is Beaufort6 the same as6 knots?
No. It is a force category linked to a range in the official table.
Does an easterly wind blow toward the east?
The Met Office defines direction as where the wind comes from.
Sources and scope
Scope notes distinguish published documentation, supplied information and editorial methods. They do not report a hands-on service test.
- Met Office windmeasurement — Knotunit,direction-fromconventionandgustmeasurementcontext
- Met Office Beaufortscale — Forcecategories,speedrangesandseastatedistinctions
