Severe Thunderstorm Warning issued October 21 at 4:47PM MST until October 21 at 5:00PM MST by NWS Flagstaff AZ

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   21 October 2026 at 23:55 UTC

   Version 2

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   Title

   Before

   Severe Thunderstorm Warning issued October 21 at 4:34PM MST until October 21 at 5:00PM MST by NWS Flagstaff AZ

   After

   Severe Thunderstorm Warning issued October 21 at 4:47PM MST until October 21 at 5:00PM MST by NWS Flagstaff AZ

   Source updated

   Before

   21 October 2026 at 23:34 UTC

   After

   21 October 2026 at 23:47 UTC

   Effective from

   Before

   21 October 2026 at 23:34 UTC

   After

   21 October 2026 at 23:47 UTC

   Forecast onset

   Before

   21 October 2026 at 23:34 UTC

   After

   21 October 2026 at 23:47 UTC

   Message type

   Before

   Alert

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   Update

   Source status

   Before

   Source alert

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   Source update

   Official description

   Before

   SVRFGZ The National Weather Service in Flagstaff has issued a * Severe Thunderstorm Warning for... Coconino County in north central Arizona... * Until 500 PM MST. * At 434 PM MST, a severe thunderstorm was located 11 miles southwest of Grand Canyon National Park, or 39 miles west of Grand Canyon Village, moving north at 50 mph. HAZARD...Half dollar size hail. SOURCE...Radar indicated. IMPACT...Damage to vehicles is expected. * Locations impacted include... Supai, Hualapai Reservation, Havasupai Reservation, Little Navajo Falls, Hualapai Hilltop, Mooney Falls and Beaver Falls. This includes the Colorado River between river miles 138 and 170. This includes the following recreation areas and campgrounds... Ponchos Camp Site, Football Field Camp Site, Backeddy Camp Site, Doris Camp Site, Fishtail Camp Site, Keyhole Camp Site, Above Kanab Camp Site, Kanab Camp Site, Lower Kanab Camp Site, Above Olo Camp Site, Olo Camp Site, Opposite Matkat Canyon Camp Site, Matkat Hotel Camp Site, Below Matkat Hotel Camp Site, Upset Hotel Camp Sit…

   After

   At 447 PM MST, a severe thunderstorm was located 6 miles west of Supai, or 38 miles west of Grand Canyon Village, moving north at 50 mph. HAZARD...Half dollar size hail. SOURCE...Radar indicated. IMPACT...Damage to vehicles is expected. Locations impacted include... Supai, Havasupai Reservation, Little Navajo Falls, Beaver Falls and Mooney Falls. This includes the Colorado River between river miles 143 and 170. This includes the following recreation areas and campgrounds... Above Kanab Camp Site, Opposite Matkat Canyon Camp Site, Matkat Hotel Camp Site, Below Matkat Hotel Camp Site, Upset Hotel Camp Sit…

   External source link

   Before

   https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.59f57e8d4cc2e3a0d8367aa15f4844a1eb862099.001.1

   After

   https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.2475ff0e198c59803ba455f6c31cdd7b658c24b1.001.1

   Bulletin issued: 21 October 2026 at 23:47 UTC

   View saved version 2

   Original saved fields, unchanged. This is our record, not an archived copy of the external webpage.

   {
     "id": "nws:c075002d33b5f2b7ee01f499",
     "authorityId": "urn:oid:2.49.0.1.840.0.2475ff0e198c59803ba455f6c31cdd7b658c24b1.001.1",
     "sender": "w-nws.webmaster@noaa.gov",
     "references": [
       {
         "identifier": "urn:oid:2.49.0.1.840.0.59f57e8d4cc2e3a0d8367aa15f4844a1eb862099.001.1",
         "sender": "w-nws.webmaster@noaa.gov"
       }
     ],
     "category": "weather",
     "title": "Severe Thunderstorm Warning issued October 21 at 4:47PM MST until October 21 at 5:00PM MST by NWS Flagstaff AZ",
     "eventType": "Severe Thunderstorm Warning",
     "occurredAt": "2026-10-21T23:47:00.000Z",
     "issuedAt": "2026-10-21T23:47:00.000Z",
     "timeBasis": "Bulletin issued",
     "effectiveAt": "2026-10-21T23:47:00.000Z",
     "onsetAt": "2026-10-21T23:47:00.000Z",
     "expiresAt": "2026-10-22T00:00:00.000Z",
     "forecastEndAt": "2026-10-22T00:00:00.000Z",
     "severity": "Severe",
     "urgency": "Immediate",
     "certainty": "Observed",
     "messageType": "Update",
     "status": "Source update",
     "place": "Coconino, AZ",
     "coordinates": null,
     "issuer": "NWS Flagstaff AZ",
     "summary": "Severe Thunderstorm Warning · Coconino, AZ. Severe; observed; urgency: immediate.",
     "description": "At 447 PM MST, a severe thunderstorm was located 6 miles west of\nSupai, or 38 miles west of Grand Canyon Village, moving north at 50\nmph.\n\nHAZARD...Half dollar size hail.\n\nSOURCE...Radar indicated.\n\nIMPACT...Damage to vehicles is expected.\n\nLocations impacted include...\nSupai, Havasupai Reservation, Little Navajo Falls, Beaver Falls and\nMooney Falls.\n\nThis includes the Colorado River between river miles 143 and 170.\n\nThis includes the following recreation areas and campgrounds...\nAbove Kanab Camp Site, Opposite Matkat Canyon Camp Site, Matkat Hotel\nCamp Site, Below Matkat Hotel Camp Site, Upset Hotel Camp Site,\nSinyala Camp Site, Very Last Chance Camp Site, First Chance Camp\nSite, Second Chance Camp Site and Fern Glen Camp Site.\n\nThis includes the following swimming holes...\nAll swimming holes on Havasu Creek near Supai.",
     "instruction": "Seek shelter inside a well-built structure and stay away from\nwindows. This storm is capable of producing large hail.\n\nTornadoes can develop quickly from severe thunderstorms. Seek shelter\nimmediately in an interior room on the lowest floor of a well-built\nstructure.\n\nA Tornado Watch remains in effect until 600 PM MST Wednesday for a\nportion of north central Arizona.",
     "url": "https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.2475ff0e198c59803ba455f6c31cdd7b658c24b1.001.1",
     "source": "nws",
     "sourceName": "NOAA NWS"
   }

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