NOAA NWS / Event history

Freeze Warning issued October 16 at 8:41AM MDT until October 16 at 9:00AM MDT by NWS Riverton WY

Freeze Warning · Southwest Bighorn Basin; Southeast Bighorn Basin; Northeast Johnson County; Southeast Johnson County; Upper Wind River Basin; Wind River Basin; Lander Foothills; Green Mountains and Rattlesnake Range; Natrona County Lower Elevations; Rock Springs and Green River; Flaming Gorge; East Sweetwater County. Severe; likely; urgency: expected.

See what changed ↓Detailed event record ↗

Bulletin issued: 16 October 2026 at 14:41 UTC
First saved by us: 15 October 2026 at 07:58 UTC
Last included in a daily record: 16 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 Riverton WY · Southwest Bighorn Basin; Southeast Bighorn Basin; Northeast Johnson County; Southeast Johnson County; Upper Wind River Basin; Wind River Basin; Lander Foothills; Green Mountains and Rattlesnake Range; Natrona County Lower Elevations; Rock Springs and Green River; Flaming Gorge; East Sweetwater County
Certainty / urgency: Likely / Expected
Message expiry (not hazard end): 16 October 2026 at 15:45 UTC
Forecast onset / end: 16 October 2026 at 14:41 UTC / 16 October 2026 at 15:00 UTC

Archived official description

Hard freezes have occurred, ending the growing season. Temperatures continue to increase through the next few hours. Therefore, the Freeze Warning will be allowed to expire.

The saved record

What changed

2 updates · 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 2 changes

Saved by us

16 October 2026 at 14:47 UTC

Version 3

8 recorded details changed

Title: Before
Freeze Warning issued October 15 at 12:23PM MDT until October 16 at 9:00AM MDT by NWS Riverton WY
After
Freeze Warning issued October 16 at 8:41AM MDT until October 16 at 9:00AM MDT by NWS Riverton WY
Source updated: Before
15 October 2026 at 18:23 UTC
After
16 October 2026 at 14:41 UTC
Effective from: Before
15 October 2026 at 18:23 UTC
After
16 October 2026 at 14:41 UTC
Forecast onset: Before
16 October 2026 at 05:00 UTC
After
16 October 2026 at 14:41 UTC
Message expiry: Before
16 October 2026 at 15:00 UTC
After
16 October 2026 at 15:45 UTC
Official description: Before
* WHAT...Sub-freezing temperatures 22 to 26 degrees expected. * WHERE...Portions of central, north central, and south central Wyoming. * WHEN...From 11 PM this evening to 9 AM MDT Friday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation, and possibly damage unprotected outdoor plumbing.
After
Hard freezes have occurred, ending the growing season. Temperatures continue to increase through the next few hours. Therefore, the Freeze Warning will be allowed to expire.
Official instructions: Before
~~Take steps now to protect tender plants from the cold. To prevent water pipes from freezing; wrap or drain or allow them to drip slowly.~~
After
Not supplied
External source link: Before
https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.7a864e70189d27ed85b000cad2023b97800fc99b.001.1
After
https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.b9b97347eb0f2133d347e174be3ab03004226da6.001.1

Bulletin issued: 16 October 2026 at 14:41 UTC

View saved version 3

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

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  "id": "nws:647e5028b283a3a8eb680c67",
  "authorityId": "urn:oid:2.49.0.1.840.0.b9b97347eb0f2133d347e174be3ab03004226da6.001.1",
  "sender": "w-nws.webmaster@noaa.gov",
  "references": [
    {
      "identifier": "urn:oid:2.49.0.1.840.0.7a864e70189d27ed85b000cad2023b97800fc99b.001.1",
      "sender": "w-nws.webmaster@noaa.gov"
    }
  ],
  "category": "weather",
  "title": "Freeze Warning issued October 16 at 8:41AM MDT until October 16 at 9:00AM MDT by NWS Riverton WY",
  "eventType": "Freeze Warning",
  "occurredAt": "2026-10-16T14:41:00.000Z",
  "issuedAt": "2026-10-16T14:41:00.000Z",
  "timeBasis": "Bulletin issued",
  "effectiveAt": "2026-10-16T14:41:00.000Z",
  "onsetAt": "2026-10-16T14:41:00.000Z",
  "expiresAt": "2026-10-16T15:45:00.000Z",
  "forecastEndAt": "2026-10-16T15:00:00.000Z",
  "severity": "Severe",
  "urgency": "Expected",
  "certainty": "Likely",
  "messageType": "Update",
  "status": "Source update",
  "place": "Southwest Bighorn Basin; Southeast Bighorn Basin; Northeast Johnson County; Southeast Johnson County; Upper Wind River Basin; Wind River Basin; Lander Foothills; Green Mountains and Rattlesnake Range; Natrona County Lower Elevations; Rock Springs and Green River; Flaming Gorge; East Sweetwater County",
  "coordinates": null,
  "issuer": "NWS Riverton WY",
  "summary": "Freeze Warning · Southwest Bighorn Basin; Southeast Bighorn Basin; Northeast Johnson County; Southeast Johnson County; Upper Wind River Basin; Wind River Basin; Lander Foothills; Green Mountains and Rattlesnake Range; Natrona County Lower Elevations; Rock Springs and Green River; Flaming Gorge; East Sweetwater County. Severe; likely; urgency: expected.",
  "description": "Hard freezes have occurred, ending the growing season. Temperatures\ncontinue to increase through the next few hours. Therefore, the\nFreeze Warning will be allowed to expire.",
  "instruction": "",
  "url": "https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.b9b97347eb0f2133d347e174be3ab03004226da6.001.1",
  "source": "nws",
  "sourceName": "NOAA NWS"
}

Visit the external source ↗

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

Saved by us

15 October 2026 at 18:32 UTC

Version 2

Source status changed

Title: Before
Freeze Warning issued October 15 at 1:46AM MDT until October 16 at 9:00AM MDT by NWS Riverton WY
After
Freeze Warning issued October 15 at 12:23PM MDT until October 16 at 9:00AM MDT by NWS Riverton WY
Source updated: Before
15 October 2026 at 07:46 UTC
After
15 October 2026 at 18:23 UTC
Effective from: Before
15 October 2026 at 07:46 UTC
After
15 October 2026 at 18:23 UTC
Message expiry: Before
15 October 2026 at 23:00 UTC
After
16 October 2026 at 15:00 UTC
Message type: Before
Alert
After
Update
Source status: Before
Source alert
After
Source update
Official description: Before
* WHAT...Sub-freezing temperatures ~~21 to 28~~ degrees expected. * WHERE...Portions of central, north central, and south central Wyoming. * WHEN...From 11 PM this e…
After
* WHAT...Sub-freezing temperatures 22 to 26 degrees expected. * WHERE...Portions of central, north central, and south central Wyoming. * WHEN...From 11 PM this e…
Official instructions: Before
Take steps now to protect tender plants from the cold.
After
Take steps now to protect tender plants from the cold. To prevent water pipes from freezing; wrap or drain or allow them to drip slowly.
External source link: Before
https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.be6d4c86dfac89fc28a2321898919c3efd8f78dc.001.2
After
https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.7a864e70189d27ed85b000cad2023b97800fc99b.001.1

Bulletin issued: 15 October 2026 at 18:23 UTC

View saved version 2

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

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  "id": "nws:4b4fab1efef0cdcc84b9dfbd",
  "authorityId": "urn:oid:2.49.0.1.840.0.7a864e70189d27ed85b000cad2023b97800fc99b.001.1",
  "sender": "w-nws.webmaster@noaa.gov",
  "references": [
    {
      "identifier": "urn:oid:2.49.0.1.840.0.be6d4c86dfac89fc28a2321898919c3efd8f78dc.001.2",
      "sender": "w-nws.webmaster@noaa.gov"
    }
  ],
  "category": "weather",
  "title": "Freeze Warning issued October 15 at 12:23PM MDT until October 16 at 9:00AM MDT by NWS Riverton WY",
  "eventType": "Freeze Warning",
  "occurredAt": "2026-10-15T18:23:00.000Z",
  "issuedAt": "2026-10-15T18:23:00.000Z",
  "timeBasis": "Bulletin issued",
  "effectiveAt": "2026-10-15T18:23:00.000Z",
  "onsetAt": "2026-10-16T05:00:00.000Z",
  "expiresAt": "2026-10-16T15:00:00.000Z",
  "forecastEndAt": "2026-10-16T15:00:00.000Z",
  "severity": "Severe",
  "urgency": "Expected",
  "certainty": "Likely",
  "messageType": "Update",
  "status": "Source update",
  "place": "Southwest Bighorn Basin; Southeast Bighorn Basin; Northeast Johnson County; Southeast Johnson County; Upper Wind River Basin; Wind River Basin; Lander Foothills; Green Mountains and Rattlesnake Range; Natrona County Lower Elevations; Rock Springs and Green River; Flaming Gorge; East Sweetwater County",
  "coordinates": null,
  "issuer": "NWS Riverton WY",
  "summary": "Freeze Warning · Southwest Bighorn Basin; Southeast Bighorn Basin; Northeast Johnson County; Southeast Johnson County; Upper Wind River Basin; Wind River Basin; Lander Foothills; Green Mountains and Rattlesnake Range; Natrona County Lower Elevations; Rock Springs and Green River; Flaming Gorge; East Sweetwater County. Severe; likely; urgency: expected.",
  "description": "* WHAT...Sub-freezing temperatures 22 to 26 degrees expected.\n\n* WHERE...Portions of central, north central, and south central\nWyoming.\n\n* WHEN...From 11 PM this evening to 9 AM MDT Friday.\n\n* IMPACTS...Frost and freeze conditions could kill crops, other\nsensitive vegetation, and possibly damage unprotected outdoor\nplumbing.",
  "instruction": "Take steps now to protect tender plants from the cold.\n\nTo prevent water pipes from freezing; wrap or drain or allow them to\ndrip slowly.",
  "url": "https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.7a864e70189d27ed85b000cad2023b97800fc99b.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 · 15 October 2026 at 07:58 UTC

Saved by us

15 October 2026 at 07:58 UTC

Starting point

First saved record

Our first saved version of Freeze Warning issued October 15 at 1:46AM MDT until October 16 at 9:00AM MDT by NWS Riverton WY. We have no earlier saved version to compare.

Bulletin issued: 15 October 2026 at 07:46 UTC

View saved version 1

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

{
  "id": "nws:54e1b821b0192d2d23e5be02",
  "authorityId": "urn:oid:2.49.0.1.840.0.be6d4c86dfac89fc28a2321898919c3efd8f78dc.001.2",
  "sender": "w-nws.webmaster@noaa.gov",
  "references": [],
  "category": "weather",
  "title": "Freeze Warning issued October 15 at 1:46AM MDT until October 16 at 9:00AM MDT by NWS Riverton WY",
  "eventType": "Freeze Warning",
  "occurredAt": "2026-10-15T07:46:00.000Z",
  "issuedAt": "2026-10-15T07:46:00.000Z",
  "timeBasis": "Bulletin issued",
  "effectiveAt": "2026-10-15T07:46:00.000Z",
  "onsetAt": "2026-10-16T05:00:00.000Z",
  "expiresAt": "2026-10-15T23:00:00.000Z",
  "forecastEndAt": "2026-10-16T15:00:00.000Z",
  "severity": "Severe",
  "urgency": "Expected",
  "certainty": "Likely",
  "messageType": "Alert",
  "status": "Source alert",
  "place": "Southwest Bighorn Basin; Southeast Bighorn Basin; Northeast Johnson County; Southeast Johnson County; Upper Wind River Basin; Wind River Basin; Lander Foothills; Green Mountains and Rattlesnake Range; Natrona County Lower Elevations; Rock Springs and Green River; Flaming Gorge; East Sweetwater County",
  "coordinates": null,
  "issuer": "NWS Riverton WY",
  "summary": "Freeze Warning · Southwest Bighorn Basin; Southeast Bighorn Basin; Northeast Johnson County; Southeast Johnson County; Upper Wind River Basin; Wind River Basin; Lander Foothills; Green Mountains and Rattlesnake Range; Natrona County Lower Elevations; Rock Springs and Green River; Flaming Gorge; East Sweetwater County. Severe; likely; urgency: expected.",
  "description": "* WHAT...Sub-freezing temperatures 21 to 28 degrees expected.\n\n* WHERE...Portions of central, north central, and south central\nWyoming.\n\n* WHEN...From 11 PM this evening to 9 AM MDT Friday.\n\n* IMPACTS...Frost and freeze conditions could kill crops, other\nsensitive vegetation, and possibly damage unprotected outdoor\nplumbing.",
  "instruction": "Take steps now to protect tender plants from the cold.",
  "url": "https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.be6d4c86dfac89fc28a2321898919c3efd8f78dc.001.2",
  "source": "nws",
  "sourceName": "NOAA NWS"
}

Visit the external source ↗

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