Station Model Wind Barb Speed Decoder
Decode independently observed conventional 50/10/5knot symbols; no wind direction, OCR or different unit convention inferred. Caller independently establishes matching units, evidence, method edition and applicability; output is not compliance, diagnosis, work-safety approval, geological identity or validated hazard prediction.
Description
A conventional wind barb uses pennants, full barbs and half barbs to encode speed in knots.
A conventional wind barb uses pennants, full barbs and half barbs to encode speed in knots.1
Symbol counts need to be observed independently of wind direction.
When to use Station Model Wind Barb Speed Decoder
Use this tool to calculate or review the supplied observations under the stated rules. Match the observation method, units, averaging period and independently established reference.
How to use Station Model Wind Barb Speed Decoder and understand its results
- Match the observation method, units, averaging period and independently established reference.
- Enter observedPennants, observedFullBarbs, observedHalfBarbs, observedCalmCircle, using the field meanings and rules below, then run the tool.
- Read decodedWindKnots. Inspect nested result fields where present, and review unknown records separately from known matches.
- Correct any reported input issue and run again. Before using a successful result, check the stated units, signs, reference scope and observation coverage.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| observedPennants | Observed pennants | number | Required |
| observedFullBarbs | Observed full barbs | number | Required |
| observedHalfBarbs | Observed half barbs | number | Required |
| observedCalmCircle | Observed calm circle | boolean | Required |
Use safe-integer pennant and full-barb counts 0..20 and half-barb count 0..1, plus a calm-circle boolean. A calm circle requires all counts zero. Sum 50×pennants+10×fullBarbs+5×halfBarbs; all-zero counts without a calm circle are accepted as zero speed too.
speedKnots=50pennants+10fullBarbs+5halfBarbs Use the matching field units and the exact boundary, ordering and reference rules above.
| Output field | Meaning | Value type |
|---|---|---|
| decodedWindKnots | Decoded wind knots | number |
{
"input": {
"observedPennants": 1,
"observedFullBarbs": 2,
"observedHalfBarbs": 1,
"observedCalmCircle": false
},
"output": {
"decodedWindKnots": 75
}
}Limitations and assumptions
The observations and reference conditions must be independently established. This result is a record summary or stated model screen, not an official warning or a validated event forecast.
Missing required fields, unknown fields, wrong types and violated rules return input issues. Numeric values and outputs must be finite.
Alternative or Complementary methods
For a related step, use Tropical Depression vs Storm Wind Classifier: A tropical wind-stage screen uses a declared maximum sustained wind convention. For a complementary comparison, use Zonal Index Circulation Strength Calculator: A zonal circulation index can summarize eastward flow around a matched ring.
References
-
Station Model Wind Barb Speed Decoder — tool.io
Similar or alternative tools
- Tropical Depression vs Storm Wind Classifier
A tropical wind-stage screen uses a declared maximum sustained wind convention.
- Zonal Index Circulation Strength Calculator
A zonal circulation index can summarize eastward flow around a matched ring.