Cheyenne, Wyoming
Regional Weather Alerts
| Alert: | Red Flag Warning |
| Area(s): | Niobrara/Lower Elevations of Converse/Thunder Basin National Grassland; Middle North Platte River Basin/Niobrara and Converse High Plains; North Laramie Range and Adjacent High Plains; North Laramie Valley/Shirley Basin; Ferris/Seminoe/Shirley Mountains; Central and West Carbon; Southwest Carbon County; North Snowy Range Foothills; Southern Laramie Valley |
| Effective: | 2026-09-08 @ 1:03 pm -> 2026-09-08 @ 9:00 pm |
| Onset: | 2026-09-08 @ 1:03 pm -> 2026-09-08 @ 9:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Cheyenne WY on 2026-09-08 @ 1:03 pm |
| Headline: | Red Flag Warning issued September 8 at 12:03PM MDT until September 8 at 8:00PM MDT by NWS Cheyenne WY |
| Description: |
* AFFECTED AREA...Fire weather zones 417, 418, 419, 420, 421, 422, and 427. * WIND... WESTERLY WINDS GUSTING TO 35 MPH * HUMIDITY...BETWEEN 10 AND 15 PERCENT * IMPACTS...Any fires that develop will likely spread rapidly. Outdoor burning is not recommended. |
| Alert: | Red Flag Warning |
| Area(s): | Cody Foothills; Upper Wind River Basin/Wind River Basin; South Bighorn Mountains; Owl Creek Mountains |
| Effective: | 2026-09-08 @ 12:49 pm -> 2026-09-08 @ 8:00 pm |
| Onset: | 2026-09-08 @ 1:00 pm -> 2026-09-08 @ 8:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Riverton WY on 2026-09-08 @ 12:49 pm |
| Headline: | Red Flag Warning issued September 8 at 11:49AM MDT until September 8 at 7:00PM MDT by NWS Riverton WY |
| Description: |
* IMPACTS: Low Humidities...Strong Gusty Winds...and Wind Shift with a Cold Front could cause erratic fire behavior. * AFFECTED AREA: In Central WY Fire Zones...283...285. In North Central WY Fire Zones...276...287. * COUNTIES AFFECTED: In Central WY...Fremont...Natrona. In North Central WY...Hot Springs...Johnson...Park...Washakie. * COLD FRONT: A dry cold front reaches northern portions of the Bighorn Basin around 5 PM. Winds turn more northerly as the front progresses southward through the evening. * WIND: West 10 to 20 mph with gusts up to 30 mph. * HUMIDITY: As low as 11 percent. |
| Alert: | Fire Weather Watch |
| Area(s): | Lincoln and Uinta Counties/Lower Elevations; Upper Green River Basin/Rock Springs BLM; Sweetwater County/Rock Springs BLM/Flaming Gorge NRA |
| Effective: | 2026-09-08 @ 12:49 pm -> 2026-09-09 @ 8:00 am |
| Onset: | 2026-09-09 @ 1:00 pm -> 2026-09-09 @ 8:00 pm |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Riverton WY on 2026-09-08 @ 12:49 pm |
| Headline: | Fire Weather Watch issued September 8 at 11:49AM MDT until September 9 at 7:00PM MDT by NWS Riverton WY |
| Description: |
The National Weather Service in Riverton has issued a Fire Weather Watch, which is in effect from Wednesday afternoon through Wednesday evening. * IMPACTS: Low Humidities...and Strong Gusty Winds could cause erratic fire behavior. * AFFECTED AREA: In Southwest WY Fire Zones...277...279. In West Central WY Fire Zone....278. * COUNTIES AFFECTED: In Southwest WY...Sweetwater...Uinta. In West Central WY...Lincoln...Sublette. * WIND: West 10 to 15 mph with gusts up to 30 mph. * HUMIDITY: As low as 10 percent. |
| Alert: | Red Flag Warning |
| Area(s): | Natrona County/Casper BLM; Granite/Green/Ferris/Rattlesnake Mountains; Casper Mountain |
| Effective: | 2026-09-08 @ 12:49 pm -> 2026-09-09 @ 8:00 am |
| Onset: | 2026-09-08 @ 1:00 pm -> 2026-09-10 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Riverton WY on 2026-09-08 @ 12:49 pm |
| Headline: | Red Flag Warning issued September 8 at 11:49AM MDT until September 10 at 9:00PM MDT by NWS Riverton WY |
| Description: |
* IMPACTS: Low Humidities...Strong Gusty Winds...and Wind Shift with a Cold Front could cause erratic fire behavior. * AFFECTED AREA: In Central WY...Fire Weather Zones 280...289 and 300. * COUNTIES AFFECTED: In Central WY...Fremont...Natrona. In Southwest WY...Sweetwater. * COLD FRONT: Winds turn northerly after sunset Tuesday, as a dry cold front comes down from the north. * WIND: Tuesday, west to southwest 15 to 25 mph with gusts up to 35 mph. Wednesday, west to southwest 10 to 20 mph with gusts to around 25 mph. Thursday, west to southwest 15 to 25 mph with gusts up to 45 mph. * HUMIDITY: Tuesday, 10 to 18 percent. Wednesday and Thursday, as low as 6 percent. |
| Alert: | Freeze Warning |
| Area(s): | Jackson Hole; Star Valley; Upper Green River Basin Foothills; Upper Green River Basin; South Lincoln County |
| Effective: | 2026-09-08 @ 12:34 pm -> 2026-09-09 @ 10:00 am |
| Onset: | 2026-09-09 @ 3:00 am -> 2026-09-09 @ 10:00 am |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Riverton WY on 2026-09-08 @ 12:34 pm |
| Headline: | Freeze Warning issued September 8 at 11:34AM MDT until September 9 at 9:00AM MDT by NWS Riverton WY |
| Description: |
* WHAT...Sub-freezing temperatures 26 to 32 degrees expected. Isolated cold prone areas 22 to 25 degrees. * WHERE...Jackson Hole, South Lincoln, Star Valley, Upper Green River Basin, and Upper Green River Basin Foothills Counties. * WHEN...From 2 AM to 9 AM MDT Wednesday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. |
