Source: https://guthlabs.ai/docs/instruments/saffir-simpson-hurricane-category/implementation/

instrument implementation / implementation-contract

# Saffir-Simpson Hurricane Category implementation

A source-bound implementation contract for Saffir-Simpson Hurricane Category; deployment and executable qualification remain separate.

Status: **VERIFIED_CLEAN**Lifecycle: **implementation-contract**

## Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

**Record owner**: Guth Instruments

**Lifecycle**: verified-clean

**Evidence ID**: t7-072

**Effect**: Computation or source lookup only

## Input and validation requirements

The lookup is unsafe without strict validation and explicit unit handling: a negative speed has no defined category, and the same numeric input 100 produces Category 2 in mph versus Category 3 in knots.

## Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

## Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

````
{
  "inputs": {
    "sustained_wind_speed": 74,
    "unit": "mph",
    "averaging": "1-minute"
  },
  "expected_outputs": {
    "category": 1,
    "damage_description": "Very dangerous winds will produce some damage."
  },
  "reference_data": {
    "nhc_rows": [
      {
        "category": 1,
        "mph_range": "74-95",
        "kt_range": "64-82",
        "damage_description": "Very dangerous winds will produce some damage.",
        "source_convention": "NHC Saffir-Simpson Hurricane Wind Scale official table; widely tabulated standard value"
      },
      {
        "category": 2,
        "mph_range": "96-110",
        "kt_range": "83-95",
        "damage_description": "Extremely dangerous winds will cause extensive damage.",
        "source_convention": "NHC Saffir-Simpson Hurricane Wind Scale official table; widely tabulated standard value"
      }
    ]
  },
  "working": "Input is 74 mph. Category 1 lower bound = 74 mph. 74 >= 74 and 74 <= 95, so the result is Category 1. The associated NHC description is: Very dangerous winds will produce some damage."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/saffir-simpson-hurricane-category/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/saffir-simpson-hurricane-category/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/saffir-simpson-hurricane-category/qualification/>)

## Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

- `VERIFIED_LEDGER.json`

- `evidence-tranche7/tranche7-results.json`