MLchartDataset catalogue

Red flag warning

Term · Meteorology and atmospheric science · MLC-T-MET-002285

A term used by fire-weather forecasters to call attention to limited weather conditions of particular importance that may result in extreme burning conditions. It is issued when it is an on-going event or the fire weather forecaster has a high degree of confidence that Red Flag criteria will occur within 24 hours of issuance. Red Flag criteria occurs whenever a geographical area has been in a dry spell for a week or two, or for a shorter period , if before spring green-up or after fall color, and the National Fire Danger Rating System (NFDRS) is high to extreme and the following forecast weather parameters are forecasted to be met:
1) a sustained wind average 15 mph or greater
2) relative humidity less than or equal to 25 percent and
3) a temperature of greater than 75 degrees F.
In some states, dry lightning and unstable air are criteria. A Fire Weather Watch may be issued prior to the Red Flag Warning.

Table 1. Record
IdentifierMLC-T-MET-002285
FieldMeteorology and atmospheric science
ReferencesNWS Glossary
Record as JSON
{
  "id": "MLC-T-MET-002285",
  "term": "Red flag warning",
  "field": "Meteorology and atmospheric science",
  "term_source": "Red Flag Warning",
  "definition": "A term used by fire-weather forecasters to call attention to limited weather conditions of particular importance that may result in extreme burning conditions. It is issued when it is an on-going event or the fire weather forecaster has a high degree of confidence that Red Flag criteria will occur within 24 hours of issuance. Red Flag criteria occurs whenever a geographical area has been in a dry spell for a week or two, or for a shorter period , if before spring green-up or after fall color, and the National Fire Danger Rating System (NFDRS) is high to extreme and the following forecast weather parameters are forecasted to be met:\n1) a sustained wind average 15 mph or greater\n2) relative humidity less than or equal to 25 percent and\n3) a temperature of greater than 75 degrees F.\nIn some states, dry lightning and unstable air are criteria. A Fire Weather Watch may be issued prior to the Red Flag Warning.",
  "references": [
    "NWS Glossary"
  ],
  "url": "https://mlchart.com/terminology/meteorology/red-flag-warning/"
}

Record 7,861 of 10,703 in Meteorology and atmospheric science terminology (MLC-0110). Request the full dataset.