{
 "dataset": "Gaithersburg, MD storm events — 12-month window, 25-mile radius (floods and special weather statements excluded, matching the city page)",
 "license": "https://www.stormauditor.com/data-license",
 "provenance": "Deduplicated by StormAuditor from public NOAA/NWS records (warnings, Local Storm Reports, NCEI Storm Events) under the published methodology at https://www.stormauditor.com/methodology",
 "refreshed_at": "2026-08-24T09:30:09.922+00:00",
 "window_days": 365,
 "event_count": 27,
 "fields": {
  "date": "Event date (YYYY-MM-DD, local storm day)",
  "county": "County or county-equivalent",
  "city": "Nearest city/place named in the source record",
  "event_type": "hazard tag: wind | hail | tornado | flood | lightning",
  "severity": "StormAuditor severity bucket (low|moderate|high|severe)",
  "evidence": "evidence level of the source record",
  "wind_mph": "reported/estimated wind gust, mph (blank if n/a)",
  "hail_in": "reported/estimated hail size, inches (blank if n/a)",
  "source": "originating public record (NWS warning, LSR, NCEI, ...)",
  "lat": "event latitude (WGS84, may be blank)",
  "lon": "event longitude (WGS84, may be blank)"
 },
 "events": [
  {
   "id": "nws-alert-d0d779de60e22c2f.001-Montgome-hail-2026-08-10",
   "lat": 39.146666666666675,
   "lon": -76.84333333333333,
   "zip": "",
   "city": "",
   "date": "2026-08-10",
   "county": "Montgomery",
   "source": "NWS Weather Alert",
   "severity": "high",
   "eventType": "hail",
   "confidence": 88,
   "damageTypes": [
    "Shingle bruising",
    "Granule displacement",
    "Metal denting",
    "Vehicle damage"
   ],
   "description": "Severe Thunderstorm Warning for Montgomery. Max hail: 0.75\". Severe Thunderstorm Warning issued August 10 at 4:24PM EDT until August 10 at 4:45PM EDT by NWS Baltimore MD/Washington DC",
   "sourceDetail": "NWS Baltimore MD/Washington DC — Severe Thunderstorm Warning Max hail: 0.75\".",
   "evidenceLevel": "warning",
   "originStation": "Baltimore MD/Washington DC Weather Station",
   "hailSizeInches": 1,
   "warningProductKey": "LWX-SV-W-393"
  },
  {
   "id": "ww-LWX-SV-W-341-2026-07-28-Montgomery-wind",
   "lat": 38.928333333333335,
   "lon": -77.08333333333333,
   "zip": "",
   "city": "",
   "date": "2026-07-28",
   "county": "Montgomery",
   "source": "IEM Watch/Warn Archive",
   "severity": "high",
   "eventType": "wind",
   "confidence": 70,
   "damageTypes": [
    "Roof shingle lift",
    "Soffit/fascia damage",
    "Tree strike risk",
    "Hurricane wind damage"
   ],
   "description": "Severe Thunderstorm Warning issued by NWS LWX on 2026-07-28. Duration: 28 min. Counties: Montgomery, Prince George's. Storm tags: wind: 60.0, hail: 0.75\". This is a warning — not a confirmed event.",
   "sourceDetail": "NWS LWX — Severe Thunderstorm Warning #341 (28 min)",
   "windSpeedMph": 60,
   "evidenceLevel": "warning",
   "originStation": "Baltimore MD/Washington DC Weather Station",
   "warningProductKey": "LWX-SV-W-341"
  },
  {
   "id": "ww-LWX-SV-W-341-2026-07-28-Montgomery-hail",
   "lat": 38.928333333333335,
   "lon": -77.08333333333333,
   "zip": "",
   "city": "",
   "date": "2026-07-28",
   "county": "Montgomery",
   "source": "IEM Watch/Warn Archive",
   "severity": "high",
   "eventType": "hail",
   "confidence": 70,
   "damageTypes": [
    "Shingle bruising",
    "Granule displacement",
    "Metal denting",
    "Vehicle damage"
   ],
   "description": "Severe Thunderstorm Warning issued by NWS LWX on 2026-07-28. Duration: 28 min. Counties: Montgomery, Prince George's. Storm tags: wind: 60.0, hail: 0.75\". This is a warning — not a confirmed event.",
   "sourceDetail": "NWS LWX — Severe Thunderstorm Warning #341 (28 min)",
   "evidenceLevel": "warning",
   "originStation": "Baltimore MD/Washington DC Weather Station",
   "hailSizeInches": 0.75,
   "warningProductKey": "LWX-SV-W-341"
  },
  {
   "id": "ww-LWX-SV-W-324-2026-07-28-Frederick-wind",
   "lat": 39.35333333333334,
   "lon": -77.11111111111111,
   "zip": "",
   "city": "",
   "date": "2026-07-28",
   "county": "Frederick",
   "source": "IEM Watch/Warn Archive",
   "severity": "high",
   "eventType": "wind",
   "confidence": 70,
   "damageTypes": [
    "Roof shingle lift",
    "Soffit/fascia damage",
    "Tree strike risk",
    "Hurricane wind damage"
   ],
   "description": "Severe Thunderstorm Warning issued by NWS LWX on 2026-07-28. Duration: 54 min. Counties: Baltimore, Howard, Carroll, Frederick, Montgomery. Storm tags: wind: 60.0, hail: 1.0\", tornado: POSSIBLE. This is a warning — not a confirmed event.",
   "sourceDetail": "NWS LWX — Severe Thunderstorm Warning #324 (54 min)",
   "windSpeedMph": 60,
   "evidenceLevel": "warning",
   "originStation": "Baltimore MD/Washington DC Weather Station",
   "warningProductKey": "LWX-SV-W-324"
  },
  {
   "id": "ww-LWX-SV-W-324-2026-07-28-Frederick-hail",
   "lat": 39.35333333333334,
   "lon": -77.11111111111111,
   "zip": "",
   "city": "",
   "date": "2026-07-28",
   "county": "Frederick",
   "source": "IEM Watch/Warn Archive",
   "severity": "high",
   "eventType": "hail",
   "confidence": 70,
   "damageTypes": [
    "Shingle bruising",
    "Granule displacement",
    "Metal denting",
    "Vehicle damage"
   ],
   "description": "Severe Thunderstorm Warning issued by NWS LWX on 2026-07-28. Duration: 54 min. Counties: Baltimore, Howard, Carroll, Frederick, Montgomery. Storm tags: wind: 60.0, hail: 1.0\", tornado: POSSIBLE. This is a warning — not a confirmed event.",
   "sourceDetail": "NWS LWX — Severe Thunderstorm Warning #324 (54 min)",
   "evidenceLevel": "warning",
   "originStation": "Baltimore MD/Washington DC Weather Station",
   "hailSizeInches": 1,
   "warningProductKey": "LWX-SV-W-324"
  },
  {
   "id": "ww-LWX-SV-W-333-2026-07-28-Howard-wind",
   "lat": 39.154666666666664,
   "lon": -76.89933333333332,
   "zip": "",
   "city": "",
   "date": "2026-07-28",
   "county": "Howard",
   "source": "IEM Watch/Warn Archive",
   "severity": "high",
   "eventType": "wind",
   "confidence": 70,
   "damageTypes": [
    "Roof shingle lift",
    "Soffit/fascia damage",
    "Tree strike risk",
    "Hurricane wind damage"
   ],
   "description": "Severe Thunderstorm Warning issued by NWS LWX on 2026-07-28. Duration: 48 min. Counties: Howard, Montgomery. Storm tags: wind: 60.0, hail: 0.75\". This is a warning — not a confirmed event.",
   "sourceDetail": "NWS LWX — Severe Thunderstorm Warning #333 (48 min)",
   "windSpeedMph": 60,
   "evidenceLevel": "warning",
   "originStation": "Baltimore MD/Washington DC Weather Station",
   "warningProductKey": "LWX-SV-W-333"
  },
  {
   "id": "ww-LWX-SV-W-333-2026-07-28-Howard-hail",
   "lat": 39.154666666666664,
   "lon": -76.89933333333332,
   "zip": "",
   "city": "",
   "date": "2026-07-28",
   "county": "Howard",
   "source": "IEM Watch/Warn Archive",
   "severity": "high",
   "eventType": "hail",
   "confidence": 70,
   "damageTypes": [
    "Shingle bruising",
    "Granule displacement",
    "Metal denting",
    "Vehicle damage"
   ],
   "description": "Severe Thunderstorm Warning issued by NWS LWX on 2026-07-28. Duration: 48 min. Counties: Howard, Montgomery. Storm tags: wind: 60.0, hail: 0.75\". This is a warning — not a confirmed event.",
   "sourceDetail": "NWS LWX — Severe Thunderstorm Warning #333 (48 min)",
   "evidenceLevel": "warning",
   "originStation": "Baltimore MD/Washington DC Weather Station",
   "hailSizeInches": 0.75,
   "warningProductKey": "LWX-SV-W-333"
  },
  {
   "id": "iem-lsr-2026-07-28-wind-38.96--76.94",
   "lat": 38.96,
   "lon": -76.94,
   "zip": "",
   "city": "Riverdale",
   "date": "2026-07-28",
   "county": "Prince Georges",
   "source": "IEM Local Storm Reports",
   "severity": "high",
   "eventType": "wind",
   "confidence": 0.92,
   "damageTypes": [
    "Roof shingle lift",
    "Soffit/fascia damage",
    "Tree strike risk",
    "Fence/screen damage"
   ],
   "description": "A wind gust of 50 knots (58 MPH) was measured by a mesonet in Riverdale (AU722/KB3PHD).",
   "sourceDetail": "NWS LWX — Mesonet via Iowa Mesonet",
   "windSpeedMph": 58,
   "evidenceLevel": "observed"
  },
  {
   "id": "iem-202607282225-wind-38.96--76.94",
   "lat": 38.96,
   "lon": -76.94,
   "zip": "",
   "city": "Riverdale",
   "date": "2026-07-28",
   "county": "Prince Georges",
   "source": "IEM Local Storm Reports",
   "severity": "high",
   "eventType": "wind",
   "confidence": 92,
   "damageTypes": [
    "Roof shingle lift",
    "Soffit/fascia damage",
    "Tree strike risk",
    "Fence/screen damage"
   ],
   "description": "TSTM WND GST reported near Riverdale, MD. Peak gust: 67 mph.",
   "sourceDetail": "NWS LWX — Mesonet via Iowa Mesonet",
   "windSpeedMph": 67,
   "evidenceLevel": "observed"
  },
  {
   "id": "iem-lsr-2026-07-05-wind-39.18--77.10",
   "lat": 39.18,
   "lon": -77.1,
   "zip": "",
   "city": "2 NNW Olney",
   "date": "2026-07-05",
   "county": "Montgomery",
   "source": "IEM Local Storm Reports",
   "severity": "high",
   "eventType": "wind",
   "confidence": 0.92,
   "damageTypes": [
    "Roof shingle lift",
    "Soffit/fascia damage",
    "Tree strike risk",
    "Fence/screen damage"
   ],
   "description": "Measured wind gust from a trained spotter at the intersection of MD-108 and Zion Rd.",
   "sourceDetail": "NWS LWX — Trained Spotter via Iowa Mesonet",
   "windSpeedMph": 60,
   "evidenceLevel": "reported"
  },
  {
   "id": "iem-202607052306-wind-39.18--77.10",
   "lat": 39.18,
   "lon": -77.1,
   "zip": "",
   "city": "2 NNW Olney",
   "date": "2026-07-05",
   "county": "Montgomery",
   "source": "IEM Local Storm Reports",
   "severity": "high",
   "eventType": "wind",
   "confidence": 92,
   "damageTypes": [
    "Roof shingle lift",
    "Soffit/fascia damage",
    "Tree strike risk",
    "Fence/screen damage"
   ],
   "description": "TSTM WND GST reported near 2 NNW Olney, MD. Peak gust: 69 mph.",
   "sourceDetail": "NWS LWX — Trained Spotter via Iowa Mesonet",
   "windSpeedMph": 69,
   "evidenceLevel": "reported"
  },
  {
   "id": "spc-2026-07-05-89-2306",
   "lat": 39.18,
   "lon": -77.1,
   "zip": "",
   "city": "Olney",
   "date": "2026-07-05",
   "county": "Montgomery",
   "source": "SPC Storm Reports",
   "severity": "high",
   "eventType": "wind",
   "confidence": 90,
   "damageTypes": [
    "Roof shingle lift",
    "Soffit/fascia damage",
    "Tree strike risk",
    "Fence/screen damage"
   ],
   "description": "Measured wind gust from a trained spotter at the intersection of MD-108 and Zion Rd. (LWX)",
   "sourceDetail": "Storm Prediction Center verified report",
   "windSpeedMph": 60,
   "evidenceLevel": "reported"
  },
  {
   "id": "spc-2026-07-05-167-2306",
   "lat": 39.18,
   "lon": -77.1,
   "zip": "20140",
   "city": "Olney Laytonsville Road",
   "date": "2026-07-05",
   "county": "Montgomery",
   "source": "SPC Storm Reports",
   "severity": "high",
   "eventType": "wind",
   "confidence": 90,
   "damageTypes": [
    "Roof shingle lift",
    "Soffit/fascia damage",
    "Tree strike risk",
    "Fence/screen damage"
   ],
   "description": "Measured wind gust from a trained spotter at the intersection of MD-108 and Zion Rd. (LWX)",
   "sourceDetail": "Storm Prediction Center verified report",
   "windSpeedMph": 60,
   "evidenceLevel": "reported"
  },
  {
   "id": "iem-lsr-2026-07-04-wind-39.38--76.92",
   "lat": 39.38,
   "lon": -76.92,
   "zip": "",
   "city": "2 N Henryton",
   "date": "2026-07-04",
   "county": "Carroll",
   "source": "IEM Local Storm Reports",
   "severity": "severe",
   "eventType": "wind",
   "confidence": 0.92,
   "damageTypes": [
    "Roof shingle lift",
    "Soffit/fascia damage",
    "Tree strike risk",
    "Fence/screen damage"
   ],
   "description": "A wind gust of 70 knots (81 MPH) was measured by a trained spotter near the intersection of Ridge Road and Brangles Road. Hundreds of large trees blew down in the area.",
   "sourceDetail": "NWS LWX — Trained Spotter via Iowa Mesonet",
   "windSpeedMph": 81,
   "evidenceLevel": "reported"
  },
  {
   "id": "iem-202607042300-wind-39.38--76.92",
   "lat": 39.38,
   "lon": -76.92,
   "zip": "",
   "city": "2 N Henryton",
   "date": "2026-07-04",
   "county": "Carroll",
   "source": "IEM Local Storm Reports",
   "severity": "severe",
   "eventType": "wind",
   "confidence": 92,
   "damageTypes": [
    "Roof shingle lift",
    "Soffit/fascia damage",
    "Tree strike risk",
    "Fence/screen damage"
   ],
   "description": "TSTM WND GST reported near 2 N Henryton, MD. Peak gust: 93 mph.",
   "sourceDetail": "NWS LWX — Trained Spotter via Iowa Mesonet",
   "windSpeedMph": 93,
   "evidenceLevel": "reported"
  },
  {
   "id": "spc-2026-07-04-137-2300",
   "lat": 39.38,
   "lon": -76.92,
   "zip": "",
   "city": "Henryton",
   "date": "2026-07-04",
   "county": "Carroll",
   "source": "SPC Storm Reports",
   "severity": "severe",
   "eventType": "wind",
   "confidence": 90,
   "damageTypes": [
    "Roof shingle lift",
    "Soffit/fascia damage",
    "Tree strike risk",
    "Fence/screen damage"
   ],
   "description": "A wind gust of 70 knots (81 MPH) was measured by a trained spotter near the intersection of Ridge Road and Brangles Road. Hundreds of large trees blew down in the area. (LWX)",
   "sourceDetail": "Storm Prediction Center verified report",
   "windSpeedMph": 81,
   "evidenceLevel": "reported"
  },
  {
   "id": "spc-2026-07-04-215-2300",
   "lat": 39.38,
   "lon": -76.92,
   "zip": "21104",
   "city": "Brangles Road",
   "date": "2026-07-04",
   "county": "Carroll",
   "source": "SPC Storm Reports",
   "severity": "severe",
   "eventType": "wind",
   "confidence": 90,
   "damageTypes": [
    "Roof shingle lift",
    "Soffit/fascia damage",
    "Tree strike risk",
    "Fence/screen damage"
   ],
   "description": "A wind gust of 70 knots (81 MPH) was measured by a trained spotter near the intersection of Ridge Road and Brangles Road. Hundreds of large trees blew down in the area. (LWX)",
   "sourceDetail": "Storm Prediction Center verified report",
   "windSpeedMph": 81,
   "evidenceLevel": "reported"
  },
  {
   "id": "asos-bf-FDK-2026-06-11",
   "lat": 39.4176,
   "lon": -77.3743,
   "zip": "",
   "city": "FREDERICK MUNI APT",
   "date": "2026-06-11",
   "county": "Frederick",
   "source": "IEM ASOS Station",
   "severity": "moderate",
   "eventType": "wind",
   "confidence": 0.95,
   "damageTypes": [
    "Roof shingle lift",
    "Soffit/fascia damage",
    "Tree strike risk",
    "Fence/screen damage"
   ],
   "description": "FREDERICK MUNI APT (FDK) recorded a 52 mph gust.",
   "sourceDetail": "MD_ASOS automated observation — FREDERICK MUNI APT (FDK) [365d backfill 2026-08]",
   "windSpeedMph": 52,
   "evidenceLevel": "observed"
  },
  {
   "id": "asos-bf-FDK-2026-06-06",
   "lat": 39.4176,
   "lon": -77.3743,
   "zip": "",
   "city": "FREDERICK MUNI APT",
   "date": "2026-06-06",
   "county": "Frederick",
   "source": "IEM ASOS Station",
   "severity": "moderate",
   "eventType": "wind",
   "confidence": 0.95,
   "damageTypes": [
    "Roof shingle lift",
    "Soffit/fascia damage",
    "Tree strike risk",
    "Fence/screen damage"
   ],
   "description": "FREDERICK MUNI APT (FDK) recorded a 52 mph gust.",
   "sourceDetail": "MD_ASOS automated observation — FREDERICK MUNI APT (FDK) [365d backfill 2026-08]",
   "windSpeedMph": 52,
   "evidenceLevel": "observed"
  },
  {
   "id": "iem-geo-2026-03-11T23:06:00Z-tornado-39.33--77.00",
   "lat": 39.33,
   "lon": -77,
   "zip": "",
   "city": "2 S Gaither",
   "date": "2026-03-11",
   "county": "Howard",
   "source": "IEM Local Storm Reports",
   "severity": "high",
   "eventType": "tornado",
   "confidence": 92,
   "damageTypes": [
    "Structural roof failure",
    "Debris penetration",
    "Complete shingle removal"
   ],
   "description": "TORNADO reported near 2 S Gaither, MD. National Weather Service Storm Survey confirms a brief EF-1 tornado occurred in Cooksville, MD from approximately 7:06PM to 7:07PM. Maximum wind is estimated at 90 mph. Path length is 0.4 miles, and a 100 yard max width.",
   "sourceDetail": "NWS LWX — NWS Storm Survey via Iowa Mesonet (GeoJSON)",
   "evidenceLevel": "reported"
  },
  {
   "id": "iem-geo-2026-03-11T23:14:00Z-tornado-39.36--76.89",
   "lat": 39.36,
   "lon": -76.89,
   "zip": "",
   "city": "1 NE Marriottsville",
   "date": "2026-03-11",
   "county": "Carroll",
   "source": "IEM Local Storm Reports",
   "severity": "high",
   "eventType": "tornado",
   "confidence": 92,
   "damageTypes": [
    "Structural roof failure",
    "Debris penetration",
    "Complete shingle removal"
   ],
   "description": "TORNADO reported near 1 NE Marriottsville, MD. EF0. Peak Wind 80 mph. Path Width 75 yards. Path length 0.3 miles.",
   "sourceDetail": "NWS LWX — NWS Storm Survey via Iowa Mesonet (GeoJSON)",
   "evidenceLevel": "reported"
  },
  {
   "id": "iem-lsr-2026-02-07-wind-39.38--77.10",
   "lat": 39.38,
   "lon": -77.1,
   "zip": "",
   "city": "1 N Watersville",
   "date": "2026-02-07",
   "county": "Carroll",
   "source": "IEM Local Storm Reports",
   "severity": "high",
   "eventType": "wind",
   "confidence": 0.92,
   "damageTypes": [
    "Roof shingle lift",
    "Soffit/fascia damage",
    "Tree strike risk",
    "Fence/screen damage"
   ],
   "description": "NON-TSTM WND GST reported near 1 N Watersville",
   "sourceDetail": "NWS LWX — Trained Spotter via Iowa Mesonet",
   "windSpeedMph": 72,
   "evidenceLevel": "reported"
  },
  {
   "id": "iem-202602071450-wind-39.38--77.10",
   "lat": 39.38,
   "lon": -77.1,
   "zip": "",
   "city": "1 N Watersville",
   "date": "2026-02-07",
   "county": "Carroll",
   "source": "IEM Local Storm Reports",
   "severity": "severe",
   "eventType": "wind",
   "confidence": 92,
   "damageTypes": [
    "Roof shingle lift",
    "Soffit/fascia damage",
    "Tree strike risk",
    "Fence/screen damage"
   ],
   "description": "NON-TSTM WND GST reported near 1 N Watersville, MD. Peak gust: 83 mph.",
   "sourceDetail": "NWS LWX — Trained Spotter via Iowa Mesonet",
   "windSpeedMph": 83,
   "evidenceLevel": "reported"
  },
  {
   "id": "iem-lsr-2025-11-16-wind-39.38--77.10",
   "lat": 39.38,
   "lon": -77.1,
   "zip": "",
   "city": "1 N Watersville",
   "date": "2025-11-16",
   "county": "Carroll",
   "source": "IEM Local Storm Reports",
   "severity": "high",
   "eventType": "wind",
   "confidence": 0.92,
   "damageTypes": [
    "Roof shingle lift",
    "Soffit/fascia damage",
    "Tree strike risk",
    "Fence/screen damage"
   ],
   "description": "Measured on personal weather station",
   "sourceDetail": "NWS LWX — Trained Spotter via Iowa Mesonet",
   "windSpeedMph": 61,
   "evidenceLevel": "reported"
  },
  {
   "id": "iem-202511161644-wind-39.38--77.10",
   "lat": 39.38,
   "lon": -77.1,
   "zip": "",
   "city": "1 N Watersville",
   "date": "2025-11-16",
   "county": "Carroll",
   "source": "IEM Local Storm Reports",
   "severity": "high",
   "eventType": "wind",
   "confidence": 92,
   "damageTypes": [
    "Roof shingle lift",
    "Soffit/fascia damage",
    "Tree strike risk",
    "Fence/screen damage"
   ],
   "description": "NON-TSTM WND GST reported near 1 N Watersville, MD. Peak gust: 70 mph.",
   "sourceDetail": "NWS LWX — Trained Spotter via Iowa Mesonet",
   "windSpeedMph": 70,
   "evidenceLevel": "reported"
  },
  {
   "id": "iem-lsr-2025-11-05-wind-39.38--77.10",
   "lat": 39.38,
   "lon": -77.1,
   "zip": "",
   "city": "1 N Watersville",
   "date": "2025-11-05",
   "county": "Carroll",
   "source": "IEM Local Storm Reports",
   "severity": "high",
   "eventType": "wind",
   "confidence": 0.92,
   "damageTypes": [
    "Roof shingle lift",
    "Soffit/fascia damage",
    "Tree strike risk",
    "Fence/screen damage"
   ],
   "description": "A wind gust of 50 knots (58 MPH) was measured by a trained spotter's personal weather station near Mount Airy.",
   "sourceDetail": "NWS LWX — Trained Spotter via Iowa Mesonet",
   "windSpeedMph": 58,
   "evidenceLevel": "reported"
  },
  {
   "id": "iem-202511060242-wind-39.38--77.10",
   "lat": 39.38,
   "lon": -77.1,
   "zip": "",
   "city": "1 N Watersville",
   "date": "2025-11-05",
   "county": "Carroll",
   "source": "IEM Local Storm Reports",
   "severity": "high",
   "eventType": "wind",
   "confidence": 92,
   "damageTypes": [
    "Roof shingle lift",
    "Soffit/fascia damage",
    "Tree strike risk",
    "Fence/screen damage"
   ],
   "description": "TSTM WND GST reported near 1 N Watersville, MD. Peak gust: 67 mph.",
   "sourceDetail": "NWS LWX — Trained Spotter via Iowa Mesonet",
   "windSpeedMph": 67,
   "evidenceLevel": "reported"
  }
 ]
}