Cheyenne, Wyoming
Regional Weather Alerts
| Alert: | Freeze Warning |
| Area(s): | Northeast Johnson County; Southeast Johnson County |
| Effective: | 2026-04-18 @ 4:13 am -> 2026-04-18 @ 10:00 am |
| Onset: | 2026-04-18 @ 4:13 am -> 2026-04-18 @ 10:00 am |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Riverton WY on 2026-04-18 @ 4:13 am |
| Headline: | Freeze Warning issued April 18 at 3:13AM MDT until April 18 at 9:00AM MDT by NWS Riverton WY |
| Description: |
* WHAT...Sub-freezing overnight temperatures in the upper teens to low 20s expected. * WHERE...Northeast Johnson County and Southeast Johnson County. * WHEN...Until 9 AM MDT this morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing such as sprinkler systems. |
| Alert: | Freeze Warning |
| Area(s): | Wind River Basin; Lander Foothills |
| Effective: | 2026-04-18 @ 4:13 am -> 2026-04-18 @ 10:00 am |
| Onset: | 2026-04-18 @ 4:13 am -> 2026-04-18 @ 10:00 am |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Riverton WY on 2026-04-18 @ 4:13 am |
| Headline: | Freeze Warning issued April 18 at 3:13AM MDT until April 18 at 9:00AM MDT by NWS Riverton WY |
| Description: |
* WHAT...Sub-freezing overnight temperatures in the upper teens to low 20s expected. * WHERE...Lander Foothills and Wind River Basin. * WHEN...Until 9 AM MDT this morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing such as sprinkler systems. |
| Alert: | Freeze Warning |
| Area(s): | Cody Foothills; Southwest Bighorn Basin |
| Effective: | 2026-04-18 @ 4:13 am -> 2026-04-18 @ 10:00 am |
| Onset: | 2026-04-18 @ 4:13 am -> 2026-04-18 @ 10:00 am |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Riverton WY on 2026-04-18 @ 4:13 am |
| Headline: | Freeze Warning issued April 18 at 3:13AM MDT until April 18 at 9:00AM MDT by NWS Riverton WY |
| Description: |
* WHAT...Sub-freezing temperatures in the upper teens to low 20s expected. * WHERE...Southwest Bighorn Basin and Cody Foothills. * WHEN...Until 9 AM MDT this morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing such as sprinkler systems. |
| Alert: | Freeze Warning |
| Area(s): | Green Mountains and Rattlesnake Range; Natrona County Lower Elevations |
| Effective: | 2026-04-18 @ 4:13 am -> 2026-04-18 @ 10:00 am |
| Onset: | 2026-04-18 @ 4:13 am -> 2026-04-18 @ 10:00 am |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Riverton WY on 2026-04-18 @ 4:13 am |
| Headline: | Freeze Warning issued April 18 at 3:13AM MDT until April 18 at 9:00AM MDT by NWS Riverton WY |
| Description: |
* WHAT...Sub-freezing overnight temperatures in the mid to upper teens expected. * WHERE...Green Mountains and Rattlesnake Range and Natrona County Lower Elevations. * WHEN...Until 9 AM MDT this morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing such as sprinkler systems. |
| Alert: | Freeze Warning |
| Area(s): | North Bighorn Basin; Southeast Bighorn Basin |
| Effective: | 2026-04-18 @ 4:13 am -> 2026-04-18 @ 10:00 am |
| Onset: | 2026-04-18 @ 4:13 am -> 2026-04-18 @ 10:00 am |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Riverton WY on 2026-04-18 @ 4:13 am |
| Headline: | Freeze Warning issued April 18 at 3:13AM MDT until April 18 at 9:00AM MDT by NWS Riverton WY |
| Description: |
* WHAT...Sub-freezing overnight temperatures in the upper teens to low 20s expected. * WHERE...Southeast Bighorn Basin and North Bighorn Basin. * WHEN...Until 9 AM MDT this morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing such as sprinkler systems. |
| Alert: | Red Flag Warning |
| Area(s): | Pine Ridge/Nebraska National Forest; Box Butte/South Sioux/Niobrara River; Lower North Platte River Basin/Scottsbluff National Monument; Lodgepole Creek/Southern Nebraska Panhandle; Laramie Foothills and High Plains; Laramie East High Plains; Bordeaux/Chugwater/Wheatland; Goshen/Middle-Lower North Platte River Basin |
| Effective: | 2026-04-18 @ 1:17 am -> 2026-04-18 @ 9:00 pm |
| Onset: | 2026-04-18 @ 12:00 pm -> 2026-04-18 @ 9:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Cheyenne WY on 2026-04-18 @ 1:17 am |
| Headline: | Red Flag Warning issued April 18 at 12:17AM MDT until April 18 at 8:00PM MDT by NWS Cheyenne WY |
| Description: |
* AFFECTED AREA...Fire weather zones 430 through 437. * WIND...For the Red Flag Warning: West to northwest gusts between 25 to 35 mph. For the Fire Weather Watch: West to northwest gusts to 20 mph Sunday, becoming light and variable overnight, then west to northwest gusts between 25 to 30 mph Monday. * HUMIDITY...For the Red Flag Warning: 12 to 15 percent. For the Fire Weather Watch: 7 to 12 percent. * IMPACTS...Any fires that develop will likely spread rapidly. Outdoor burning is not recommended. |
| Alert: | Fire Weather Watch |
| Area(s): | Pine Ridge/Nebraska National Forest; Box Butte/South Sioux/Niobrara River; Lower North Platte River Basin/Scottsbluff National Monument; Lodgepole Creek/Southern Nebraska Panhandle; Laramie Foothills and High Plains; Laramie East High Plains; Bordeaux/Chugwater/Wheatland; Goshen/Middle-Lower North Platte River Basin |
| Effective: | 2026-04-18 @ 1:17 am -> 2026-04-20 @ 9:00 pm |
| Onset: | 2026-04-19 @ 12:00 pm -> 2026-04-18 @ 9:00 pm |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Cheyenne WY on 2026-04-18 @ 1:17 am |
| Headline: | Fire Weather Watch issued April 18 at 12:17AM MDT until April 20 at 8:00PM MDT by NWS Cheyenne WY |
| Description: |
* AFFECTED AREA...Fire weather zones 430 through 437. * WIND...For the Red Flag Warning: West to northwest gusts between 25 to 35 mph. For the Fire Weather Watch: West to northwest gusts to 20 mph Sunday, becoming light and variable overnight, then west to northwest gusts between 25 to 30 mph Monday. * HUMIDITY...For the Red Flag Warning: 12 to 15 percent. For the Fire Weather Watch: 7 to 12 percent. * IMPACTS...Any fires that develop will likely spread rapidly. Outdoor burning is not recommended. |
| Alert: | Fire Weather Watch |
| Area(s): | Niobrara/Lower Elevations of Converse/Thunder Basin National Grassland; Middle North Platte River Basin/Niobrara and Converse High Plains |
| Effective: | 2026-04-18 @ 1:17 am -> 2026-04-20 @ 9:00 pm |
| Onset: | 2026-04-19 @ 12:00 pm -> 2026-04-18 @ 9:00 pm |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Cheyenne WY on 2026-04-18 @ 1:17 am |
| Headline: | Fire Weather Watch issued April 18 at 12:17AM MDT until April 20 at 8:00PM MDT by NWS Cheyenne WY |
| Description: |
* AFFECTED AREA...Fire weather zones 417 and 418. * WIND...West to northwest winds with gusts between 20 and 30 mph. * HUMIDITY...9 to 13 percent. * IMPACTS...Any fires that develop will likely spread rapidly. Outdoor burning is not recommended. |