NOAA NWS / Event history

Red Flag Warning issued October 17 at 6:31PM MDT until October 17 at 7:00PM MDT by NWS Cheyenne WY

Red Flag Warning · North Snowy Range Foothills. Severe; likely; urgency: expected.

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Bulletin issued: 18 October 2026 at 00:31 UTC
First saved by us: 17 October 2026 at 16:32 UTC
Last included in a daily record: 18 October 2026
The linked daily edition preserves what we captured that UTC day; this event page is not a live warning.
Source classification: Severe · Source update

A recent feed check does not mean a new observation. This page preserves source records; it does not establish current safety or warning status.

Issuer / area: NWS Cheyenne WY · North Snowy Range Foothills
Certainty / urgency: Likely / Expected
Message expiry (not hazard end): 18 October 2026 at 01:45 UTC
Forecast onset / end: 18 October 2026 at 00:31 UTC / 18 October 2026 at 01:00 UTC

Archived official description

The relative humidity has increased above critical levels. Hence, the Red Flag Warning will be allowed to expire on time at 7 PM MDT.

The saved record

What changed

1 update · 1 first record

Each update compares two versions we saved. This may not include every update from the source. A missing report does not mean an event has ended.

Showing 1 change

Saved by us
18 October 2026 at 00:32 UTC
Version 2
Source status changed
Title
Before
Red Flag Warning issued October 17 at 10:24AM MDT until October 17 at 7:00PM MDT by NWS Cheyenne WY
After
Red Flag Warning issued October 17 at 6:31PM MDT until October 17 at 7:00PM MDT by NWS Cheyenne WY
Source updated
Before
17 October 2026 at 16:24 UTC
After
18 October 2026 at 00:31 UTC
Effective from
Before
17 October 2026 at 16:24 UTC
After
18 October 2026 at 00:31 UTC
Forecast onset
Before
17 October 2026 at 16:24 UTC
After
18 October 2026 at 00:31 UTC
Message expiry
Before
18 October 2026 at 01:00 UTC
After
18 October 2026 at 01:45 UTC
Message type
Before
Alert
After
Update
Source status
Before
Source alert
After
Source update
Official description
Before
...RED FLAG WARNING IN EFFECT UNTIL 7 PM MDT THIS EVENING DUE TO WIND AND LOW RELATIVE HUMIDITY FOR NORTH SNOWY RANGE FOOTHILLS... The National Weather Service in Cheyenne WY has issued a Red Flag Warning. * AFFECTED AREA...Fire Weather Zone 427. * TIMING...Until 7 PM MDT this evening. * WINDS...West winds 25 to 35 mph with gusts up to 60 mph possible. * RELATIVE HUMIDITY...Relative Humidity between 8 to 12 percent. * IMPACTS...Any fires that develop will spread rapidly. Outdoor burning is not recommended.
After
The relative humidity has increased above critical levels. Hence, the Red Flag Warning will be allowed to expire on time at 7 PM MDT.
Official instructions
Before
A Red Flag Warning is issued when we identify weather conditions that promote rapid spread of fire which may become life-threatening. This does not mean there is a fire. These conditions are either occurring now or will begin soon. It is important to have multiple ways to receive information from authorities.
After
Not supplied
External source link
Before
https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.7393d1d6883c9f431c89ffd4081c3f8b02945385.001.1
After
https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.23f72a77f40db240edc8558d6c0cca26efaca68d.001.1
Bulletin issued: 18 October 2026 at 00:31 UTC
View saved version 2
Original saved fields, unchanged. This is our record, not an archived copy of the external webpage.
{ "id": "nws:471c487ea09af39e8defa49e", "authorityId": "urn:oid:2.49.0.1.840.0.23f72a77f40db240edc8558d6c0cca26efaca68d.001.1", "sender": "w-nws.webmaster@noaa.gov", "references": [ { "identifier": "urn:oid:2.49.0.1.840.0.7393d1d6883c9f431c89ffd4081c3f8b02945385.001.1", "sender": "w-nws.webmaster@noaa.gov" } ], "category": "weather", "title": "Red Flag Warning issued October 17 at 6:31PM MDT until October 17 at 7:00PM MDT by NWS Cheyenne WY", "eventType": "Red Flag Warning", "occurredAt": "2026-10-18T00:31:00.000Z", "issuedAt": "2026-10-18T00:31:00.000Z", "timeBasis": "Bulletin issued", "effectiveAt": "2026-10-18T00:31:00.000Z", "onsetAt": "2026-10-18T00:31:00.000Z", "expiresAt": "2026-10-18T01:45:00.000Z", "forecastEndAt": "2026-10-18T01:00:00.000Z", "severity": "Severe", "urgency": "Expected", "certainty": "Likely", "messageType": "Update", "status": "Source update", "place": "North Snowy Range Foothills", "coordinates": null, "issuer": "NWS Cheyenne WY", "summary": "Red Flag Warning · North Snowy Range Foothills. Severe; likely; urgency: expected.", "description": "The relative humidity has increased above critical levels. Hence, the\nRed Flag Warning will be allowed to expire on time at 7 PM MDT.", "instruction": "", "url": "https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.23f72a77f40db240edc8558d6c0cca26efaca68d.001.1", "source": "nws", "sourceName": "NOAA NWS" }
Visit the external source ↗
The external page may have changed since this version was saved.

First saved record · 17 October 2026 at 16:32 UTC

Saved by us

17 October 2026 at 16:32 UTC

Starting point

First saved record

Our first saved version of Red Flag Warning issued October 17 at 10:24AM MDT until October 17 at 7:00PM MDT by NWS Cheyenne WY. We have no earlier saved version to compare.

Bulletin issued: 17 October 2026 at 16:24 UTC

View saved version 1

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

{
  "id": "nws:dab3903457c009997afa8a4f",
  "authorityId": "urn:oid:2.49.0.1.840.0.7393d1d6883c9f431c89ffd4081c3f8b02945385.001.1",
  "sender": "w-nws.webmaster@noaa.gov",
  "references": [],
  "category": "weather",
  "title": "Red Flag Warning issued October 17 at 10:24AM MDT until October 17 at 7:00PM MDT by NWS Cheyenne WY",
  "eventType": "Red Flag Warning",
  "occurredAt": "2026-10-17T16:24:00.000Z",
  "issuedAt": "2026-10-17T16:24:00.000Z",
  "timeBasis": "Bulletin issued",
  "effectiveAt": "2026-10-17T16:24:00.000Z",
  "onsetAt": "2026-10-17T16:24:00.000Z",
  "expiresAt": "2026-10-18T01:00:00.000Z",
  "forecastEndAt": "2026-10-18T01:00:00.000Z",
  "severity": "Severe",
  "urgency": "Expected",
  "certainty": "Likely",
  "messageType": "Alert",
  "status": "Source alert",
  "place": "North Snowy Range Foothills",
  "coordinates": null,
  "issuer": "NWS Cheyenne WY",
  "summary": "Red Flag Warning · North Snowy Range Foothills. Severe; likely; urgency: expected.",
  "description": "...RED FLAG WARNING IN EFFECT UNTIL 7 PM MDT THIS EVENING DUE TO WIND\nAND LOW RELATIVE HUMIDITY FOR NORTH SNOWY RANGE FOOTHILLS...\n\nThe National Weather Service in Cheyenne WY has issued a Red Flag\nWarning.\n\n* AFFECTED AREA...Fire Weather Zone 427.\n\n* TIMING...Until 7 PM MDT this evening.\n\n* WINDS...West winds 25 to 35 mph with gusts up to 60 mph possible.\n\n* RELATIVE HUMIDITY...Relative Humidity between 8 to 12 percent.\n\n* IMPACTS...Any fires that develop will spread rapidly. Outdoor\nburning is not recommended.",
  "instruction": "A Red Flag Warning is issued when we identify weather conditions that\npromote rapid spread of fire which may become life-threatening. This\ndoes not mean there is a fire. These conditions are either occurring\nnow or will begin soon. It is important to have multiple ways to\nreceive information from authorities.",
  "url": "https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.7393d1d6883c9f431c89ffd4081c3f8b02945385.001.1",
  "source": "nws",
  "sourceName": "NOAA NWS"
}

Visit the external source ↗

The external page may have changed since this version was saved.

Red Flag Warning issued October 17 at 6:31PM MDT until October 17 at 7:00PM MDT by NWS Cheyenne WY

Archived official description

What changed

Source status changed

First saved record