FirstAlerts

Red Flag Warning Extended Through Thursday Evening for Natrona County and Casper Mountain

The National Weather Service has extended a Red Flag Warning for Natrona County/Casper BLM, the Granite/Green/Ferris/Rattlesnake Mountains, and Casper Mountain through 9 p.m. Thursday.

3 reports on this incident · first at Sep 8, 2026, 3:02 a.m. ET

By AI ReporterWritten Sep 8, 2026, 3:12 a.m. ET
Developing · checked 4h ago

Hazard products are revised and cancelled as conditions change. Check the National Weather Service for the current alert before acting on this report.

We last searched for new coverage of this at Sep 8, 2026, 3:08 a.m. ET — checked 4h ago.

The National Weather Service in Riverton, Wyoming, has extended a for Natrona County/Casper BLM, the Granite/Green/Ferris/Rattlesnake Mountains, and Casper Mountain, now in effect until 9 p.m. Thursday, September 10, 2026. The , issued at 12:58 a.m. Tuesday, September 8, now runs longer than first announced, according to the weather service. The covers zones, including Natrona County/Casper BLM, the Granite/Green/Ferris/Rattlesnake Mountains, and Casper Mountain. It began at noon Tuesday and now expires at 9 p.m. Thursday. A means critical fire weather conditions are occurring or will shortly, with a combination of strong winds, low relative humidity, and warm temperatures that can contribute to extreme fire behavior.

Earlier reports

  1. Sep 8, 2026, 3:06 a.m. ET

    Red Flag Warning Issued for Central Wyoming

    The National Weather Service in Riverton, Wyoming, has issued a Red Flag Warning for central Wyoming, effective from noon on September 8, 2026, through 9 p.m. on September 10, 2026. The warning covers seven zones, including Natrona County/Casper BLM, the Granite/Green/Ferris/Rattlesnake Mountains, and Casper Mountain.

    A Red Flag Warning means that critical fire weather conditions are either occurring now or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior, according to the warning.

  2. Sep 8, 2026, 3:02 a.m. ETFirst report

    Red Flag Warning Issued for Central Wyoming

    The National Weather Service in Riverton, Wyoming, has issued a Red Flag Warning for central Wyoming, effective from noon on September 8, 2026, until 9 p.m. on September 10, 2026. The warning, issued at 12:58 a.m. on September 8, covers seven zones, including the Natrona County/Casper BLM area, the Granite/Green/Ferris/Rattlesnake Mountains, and Casper Mountain.

    According to the warning, a combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior. The warning states that critical fire weather conditions are either occurring now or will shortly.

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Revision history

  1. Version 18 Sept 2026, 07:12current

    First published.

  2. Version 18 Sept 2026, 07:02current

    First published.

  3. Version 18 Sept 2026, 07:06current

    First published.

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