Nesterov Fire Risk Index Calculator

Route actual daily Nesterov T(T−Td) history with independently caller established rainfall-reset flags and opening index; no default reset rainfall or fire-response guidance. Caller independently verifies units, applicability and matching conditions; no operational recipe, safety certification, causal efficacy or legal/resource classification is inferred.

Description

A Nesterov-style index accumulates a specified temperature–dew-point product over a recorded sequence.

A Nesterov-style index accumulates a specified temperature–dew-point product over a recorded sequence.^[1]

Reset events change the accumulation history, while the index remains distinct from a site-calibrated fire-danger forecast. Use this tool to calculate nesterov fire risk index from the supplied measurements and assumptions.

When to use Nesterov Fire Risk Index Calculator

Use this tool to calculate nesterov fire risk index from the supplied measurements and assumptions. Establish the species/site, survey protocol, units, sampled area or exposure, and the independently chosen reference or model.

How to use Nesterov Fire Risk Index Calculator and understand its results

Establish the species/site, survey protocol, units, sampled area or exposure, and the independently chosen reference or model.
Enter observedDryBulbC, observedDewPointC, callerResetDayFlags, callerOpeningNesterovIndex, using the field meanings and rules below, then run the tool.
Read nesterovDailyIndex. Interpret the fields using their units, signs and evidence conventions below.
If input validation fails, correct the reported field and run again. Before applying the result, check reference scope, model assumptions and any missing evidence or placeholder values.

Input field	Meaning	Value type	Requirement
observedDryBulbC	Observed dry bulb c	list of number	Required
observedDewPointC	Observed dew point c	list of number	Required
callerResetDayFlags	Caller reset day flags; binary 0/1 under the definitions below	list of number	Required
callerOpeningNesterovIndex	Caller opening nesterov index	number	Required

Enter aligned nonnegative dry-bulb temperatures, finite dew-point temperatures not greater than dry bulb, and binary reset flags, plus a nonnegative opening index. Process in list order: if reset=1 set the running index to zero before adding T×(T−dewPoint), then retain the resulting index. Negative dew points are allowed. No calendar spacing or rainfall reset rule is inferred.

I_i=(reset_i ? 0 : previousIndex)+dryTemp_i×(dryTemp_i−dewTemp_i)

Use the exact units, boundary rules, ordering and missing-evidence conventions above.

Output field	Meaning	Value type
nesterovDailyIndex	Nesterov Daily Index; follow the units, sign, ordering and evidence convention stated above	list of number

json

{
  "input": {
    "observedDryBulbC": [
      20,
      21,
      22
    ],
    "observedDewPointC": [
      10,
      11,
      12
    ],
    "callerResetDayFlags": [
      0,
      1,
      0
    ],
    "callerOpeningNesterovIndex": 100
  },
  "output": {
    "nesterovDailyIndex": [
      300,
      210,
      430
    ]
  }
}

Limitations and assumptions

Reset events change the accumulation history, while the index remains distinct from a site-calibrated fire-danger forecast. Interpretation depends on the units, sampling scope and exact model described above.

All listed fields require explicit values. Unexpected fields, incorrect types, nonfinite numbers and sparse evidence arrays fail validation; the specific bounds and alignment requirements are stated above. Extremely large inputs or outputs can also be rejected. An input error is distinct from a successful result reporting false, no matches or missing evidence.

Alternative or Complementary methods

Use Anger Fire Danger Rating Calculator for this related task: An Anger-style fire-danger reference requires a documented calibration and matching weather-index convention.

Use Probability of Ignition From Fine Fuel Calculator when its separate inputs and assumptions fit the question: Observed ignition frequency summarizes independently recorded cases under a specified sampling design.

References

Nesterov Fire Risk Index Calculator — tool.io

Similar or alternative tools

Anger Fire Danger Rating Calculator
An Anger-style fire-danger reference requires a documented calibration and matching weather-index convention.
Probability of Ignition From Fine Fuel Calculator
Observed ignition frequency summarizes independently recorded cases under a specified sampling design.