weatherreporter/internal/briefing/assets/spc_convective_outlook_definitions.json

{
  "provenance": {
    "sources": [
      {
        "url": "https://www.spc.noaa.gov/about/outlooks/",
        "updated_on": "2026-03-03",
        "applies_to": "categorical outlook descriptions"
      },
      {
        "url": "https://www.spc.noaa.gov/exper/conditional-intensity-information",
        "updated_on": "2026-02-04",
        "applies_to": "conditional intensity group descriptions"
      }
    ],
    "reviewed_on": "2026-08-13",
    "review_owner": "Weatherreporter maintainers",
    "review_schedule": "Review annually and whenever SPC updates either referenced page."
  },
  "definitions": {
  "categorical:TSTM": {
    "plain_language": "General or non-severe thunderstorms.",
    "official_description": "Encloses a 10% or higher probability of thunderstorms.",
    "relative_level": "0 of 5"
  },
  "categorical:MRGL": {
    "plain_language": "Isolated severe storms possible.",
    "official_description": "Includes severe storms of either limited organization and longevity or very low coverage.",
    "relative_level": "1 of 5"
  },
  "categorical:SLGT": {
    "plain_language": "Scattered severe storms possible.",
    "official_description": "Implies organized severe thunderstorms are expected, but usually in low coverage with varying levels of intensity.",
    "relative_level": "2 of 5"
  },
  "categorical:ENH": {
    "plain_language": "Numerous severe storms possible.",
    "official_description": "Depicts a greater concentration of organized severe thunderstorms with varying levels of intensity.",
    "relative_level": "3 of 5"
  },
  "categorical:MDT": {
    "plain_language": "Widespread severe storms likely.",
    "official_description": "Indicates potential for widespread severe weather with several tornadoes and/or numerous severe thunderstorms, some of which may be intense.",
    "relative_level": "4 of 5"
  },
  "categorical:HIGH": {
    "plain_language": "Major severe outbreak expected.",
    "official_description": "Suggests a severe weather outbreak is expected from either numerous intense to violent long-track tornadoes or a long-lived derecho system with hurricane-force wind gusts producing widespread damage.",
    "relative_level": "5 of 5"
  },
  "tornado:CIG1": {
    "plain_language": "Conditional potential for significant tornadoes.",
    "official_description": "Intensity Level 1: Reasonable Max EF2. Note that this product describes the reasonable maximum intensity of a hazard if that hazard occurs. It does not by itself indicate the probability that the hazard will occur.",
    "relative_level": "1 of 3"
  },
  "tornado:CIG2": {
    "plain_language": "Conditional potential for strong tornadoes.",
    "official_description": "Intensity Level 2: Reasonable Max EF3. Note that this product describes the reasonable maximum intensity of a hazard if that hazard occurs. It does not by itself indicate the probability that the hazard will occur.",
    "relative_level": "2 of 3"
  },
  "tornado:CIG3": {
    "plain_language": "Conditional potential for violent tornadoes.",
    "official_description": "Intensity Level 3: Reasonable Max EF4 or higher. Note that this product describes the reasonable maximum intensity of a hazard if that hazard occurs. It does not by itself indicate the probability that the hazard will occur.",
    "relative_level": "3 of 3"
  },
  "wind:CIG1": {
    "plain_language": "Conditional potential for significant severe wind.",
    "official_description": "Intensity Level 1: Reasonable Max wind gusts around 65 kt / 75 mph or higher. Note that this product describes the reasonable maximum intensity of a hazard if that hazard occurs. It does not by itself indicate the probability that the hazard will occur.",
    "relative_level": "1 of 3"
  },
  "wind:CIG2": {
    "plain_language": "Conditional potential for intense severe wind.",
    "official_description": "Intensity Level 2: Reasonable Max wind gusts around 75 kt / 85 mph or higher. Note that this product describes the reasonable maximum intensity of a hazard if that hazard occurs. It does not by itself indicate the probability that the hazard will occur.",
    "relative_level": "2 of 3"
  },
  "wind:CIG3": {
    "plain_language": "Conditional potential for extreme severe wind.",
    "official_description": "Intensity Level 3: Reasonable Max wind gusts around 100 kt / 115 mph or higher. Note that this product describes the reasonable maximum intensity of a hazard if that hazard occurs. It does not by itself indicate the probability that the hazard will occur.",
    "relative_level": "3 of 3"
  },
  "hail:CIG1": {
    "plain_language": "Conditional potential for significant hail.",
    "official_description": "Intensity Level 1: Reasonable Max hail size around 2.00 to 3.75 inches. Note that this product describes the reasonable maximum intensity of a hazard if that hazard occurs. It does not by itself indicate the probability that the hazard will occur.",
    "relative_level": "1 of 2"
  },
  "hail:CIG2": {
    "plain_language": "Conditional potential for giant hail.",
    "official_description": "Intensity Level 2: Reasonable Max hail size greater than 3.75 inches. Note that this product describes the reasonable maximum intensity of a hazard if that hazard occurs. It does not by itself indicate the probability that the hazard will occur.",
    "relative_level": "2 of 2"
  }
  }
}