Cheyenne, Wyoming
Regional Weather Alerts
| Alert: | Winter Storm Warning |
| Area(s): | East Sweetwater County |
| Effective: | 2026-05-18 @ 4:14 am -> 2026-05-18 @ 7:00 pm |
| Onset: | 2026-05-18 @ 4:14 am -> 2026-05-18 @ 7:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Riverton WY on 2026-05-18 @ 4:14 am |
| Headline: | Winter Storm Warning issued May 18 at 3:14AM MDT until May 18 at 6:00PM MDT by NWS Riverton WY |
| Description: |
* WHAT...Heavy snow expected. Additional snow accumulations between 4 and 8 inches. Lower amounts up to 2 inches in the Rock Springs area. Winds gusting as high as 60 mph. * WHERE...East Sweetwater County. * WHEN...Until 6 PM MDT this evening. * IMPACTS...Travel will be very difficult, especially along Interstate 80 due to the crosswind component. The hazardous conditions will impact the Monday morning commute. |
| Alert: | Winter Weather Advisory |
| Area(s): | Upper Green River Basin |
| Effective: | 2026-05-18 @ 4:14 am -> 2026-05-18 @ 7:00 pm |
| Onset: | 2026-05-18 @ 4:14 am -> 2026-05-18 @ 7:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Riverton WY on 2026-05-18 @ 4:14 am |
| Headline: | Winter Weather Advisory issued May 18 at 3:14AM MDT until May 18 at 6:00PM MDT by NWS Riverton WY |
| Description: |
* WHAT...Snow expected. Total snow accumulations 1 to 3 inches. Winds gusting as high as 45 mph. * WHERE...Upper Green River Basin. * WHEN...Until 6 PM MDT this evening. * IMPACTS...Travel could be difficult due to a combination of wind and falling snow. The hazardous conditions could impact the Monday morning commute. * ADDITIONAL DETAILS...Greatest impacts will be further south, towards Farson. Here, winds and snow totals will be greatest. |
| Alert: | Winter Weather Advisory |
| Area(s): | Upper Wind River Basin; Wind River Basin |
| Effective: | 2026-05-18 @ 4:14 am -> 2026-05-18 @ 7:00 pm |
| Onset: | 2026-05-18 @ 4:14 am -> 2026-05-18 @ 7:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Riverton WY on 2026-05-18 @ 4:14 am |
| Headline: | Winter Weather Advisory issued May 18 at 3:14AM MDT until May 18 at 6:00PM MDT by NWS Riverton WY |
| Description: |
* WHAT...Snow expected. Additional snow accumulations between 1 and 4 inches, with locally higher amounts are possible around Hudson and Fort Washakie. Winds gusting as high as 45 mph. * WHERE...Upper Wind River Basin and Wind River Basin. * WHEN...Until 6 PM MDT this evening. * IMPACTS...Travel could be difficult due to a combination of snow and wind. The hazardous conditions could impact the Monday morning commute. Where heavy snow occurs, it is possible for tree limbs to break, as many trees have leafed out. |
| Alert: | Winter Weather Advisory |
| Area(s): | Northeast Johnson County; Southeast Johnson County |
| Effective: | 2026-05-18 @ 4:14 am -> 2026-05-18 @ 7:00 pm |
| Onset: | 2026-05-18 @ 4:14 am -> 2026-05-18 @ 7:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Riverton WY on 2026-05-18 @ 4:14 am |
| Headline: | Winter Weather Advisory issued May 18 at 3:14AM MDT until May 18 at 6:00PM MDT by NWS Riverton WY |
| Description: |
* WHAT...Snow expected. Total snow accumulations up to 2 inches. Winds gusting as high as 35 mph. * WHERE...Northeast Johnson County and Southeast Johnson County. * WHEN...Until 6 PM MDT this evening. * IMPACTS...Travel could be difficult due to a combination of wind and blowing snow. The hazardous conditions could impact the Monday morning commute. * ADDITIONAL DETAILS...Greatest snow totals will occur along the mountains and further southwards towards Kaycee. |
| Alert: | Winter Weather Advisory |
| Area(s): | South Lincoln County |
| Effective: | 2026-05-18 @ 4:14 am -> 2026-05-18 @ 7:00 pm |
| Onset: | 2026-05-18 @ 4:14 am -> 2026-05-18 @ 7:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Riverton WY on 2026-05-18 @ 4:14 am |
| Headline: | Winter Weather Advisory issued May 18 at 3:14AM MDT until May 18 at 6:00PM MDT by NWS Riverton WY |
| Description: |
* WHAT...Snow expected. Additional snow accumulations between 1 and 3 inches. Winds gusting as high as 40 mph. * WHERE...South Lincoln County. * WHEN...Until 6 PM MDT this evening. * IMPACTS...Travel could be difficult. The hazardous conditions could impact the Monday morning commute. |
| Alert: | Winter Weather Advisory |
| Area(s): | Cody Foothills; Southwest Bighorn Basin |
| Effective: | 2026-05-18 @ 4:14 am -> 2026-05-18 @ 7:00 pm |
| Onset: | 2026-05-18 @ 4:14 am -> 2026-05-18 @ 7:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Riverton WY on 2026-05-18 @ 4:14 am |
| Headline: | Winter Weather Advisory issued May 18 at 3:14AM MDT until May 18 at 6:00PM MDT by NWS Riverton WY |
| Description: |
* WHAT...Snow expected. Total snow accumulations up to 2 inches. Winds gusting as high as 50 mph. * WHERE...Southwest Bighorn Basin and Cody Foothills. * WHEN...Until 6 PM MDT this evening. * IMPACTS...Travel could be difficult due to a combination of snow and wind. The hazardous conditions could impact the Monday morning commute. * ADDITIONAL DETAILS...There is potential for a steep gradient in snow totals along the mountains, with snow totals quickly going from around 1 inch to 4 inches or more. |
| Alert: | Winter Storm Warning |
| Area(s): | Wind River Mountains East |
| Effective: | 2026-05-18 @ 4:14 am -> 2026-05-18 @ 7:00 pm |
| Onset: | 2026-05-18 @ 4:14 am -> 2026-05-18 @ 7:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Riverton WY on 2026-05-18 @ 4:14 am |
| Headline: | Winter Storm Warning issued May 18 at 3:14AM MDT until May 18 at 6:00PM MDT by NWS Riverton WY |
| Description: |
* WHAT...Heavy snow expected. Additional snow accumulations between 5 and 9 inches, with locally higher amounts at the highest elevations. Winds gusting as high as 60 mph. * WHERE...Wind River Mountains East. * WHEN...Until 6 PM MDT this evening. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Monday morning commute, including over South Pass. |
| Alert: | Winter Storm Warning |
| Area(s): | Natrona County Lower Elevations |
| Effective: | 2026-05-18 @ 4:14 am -> 2026-05-18 @ 7:00 pm |
| Onset: | 2026-05-18 @ 4:14 am -> 2026-05-18 @ 7:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Riverton WY on 2026-05-18 @ 4:14 am |
| Headline: | Winter Storm Warning issued May 18 at 3:14AM MDT until May 18 at 6:00PM MDT by NWS Riverton WY |
| Description: |
* WHAT...Heavy snow expected. Total snow accumulations between 3 and 6 inches. Areas of higher amounts up to 8 inches between Hiland and Casper and the south side of Casper. Winds gusting as high as 40 mph. * WHERE...Natrona County Lower Elevations. * WHEN...Until 6 PM MDT this evening. * IMPACTS...Travel will be difficult, especially along US Highway 20/26 between Hiland and Casper. The hazardous conditions will impact the Monday morning commute. Heavy snow could break tree limbs as many trees have leafed out. |
| Alert: | Winter Storm Warning |
| Area(s): | Green Mountains and Rattlesnake Range |
| Effective: | 2026-05-18 @ 4:14 am -> 2026-05-18 @ 7:00 pm |
| Onset: | 2026-05-18 @ 4:14 am -> 2026-05-18 @ 7:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Riverton WY on 2026-05-18 @ 4:14 am |
| Headline: | Winter Storm Warning issued May 18 at 3:14AM MDT until May 18 at 6:00PM MDT by NWS Riverton WY |
| Description: |
* WHAT...Heavy snow possible. Additional snow accumulations between 6 and 12 inches possible with locally higher amounts up to 15 inches. Winds gusting as high as 55 mph. * WHERE...Green Mountains and Rattlesnake Range. * WHEN...Until 6 PM MDT this evening. * IMPACTS...Travel will be difficult. The hazardous conditions will impact the Monday morning commute. |
| Alert: | Winter Weather Advisory |
| Area(s): | Rock Springs and Green River; Flaming Gorge |
| Effective: | 2026-05-18 @ 4:14 am -> 2026-05-18 @ 7:00 pm |
| Onset: | 2026-05-18 @ 4:14 am -> 2026-05-18 @ 7:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Riverton WY on 2026-05-18 @ 4:14 am |
| Headline: | Winter Weather Advisory issued May 18 at 3:14AM MDT until May 18 at 6:00PM MDT by NWS Riverton WY |
| Description: |
* WHAT...Snow expected. Additional snow accumulations between 2 and 5 inches. Winds gusting as high as 55 mph. * WHERE...Flaming Gorge and Rock Springs and Green River. * WHEN...Until 6 PM MDT this evening. * IMPACTS...Travel could be difficult, especially along Interstate 80. The hazardous conditions could impact the Monday morning commute. |
| Alert: | Winter Weather Advisory |
| Area(s): | Absaroka Mountains; Owl Creek and Bridger Mountains; Bighorn Mountains West; Bighorn Mountains Southeast |
| Effective: | 2026-05-18 @ 4:14 am -> 2026-05-18 @ 7:00 pm |
| Onset: | 2026-05-18 @ 4:14 am -> 2026-05-18 @ 7:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Riverton WY on 2026-05-18 @ 4:14 am |
| Headline: | Winter Weather Advisory issued May 18 at 3:14AM MDT until May 18 at 6:00PM MDT by NWS Riverton WY |
| Description: |
* WHAT...Snow expected. Additional snow accumulations up to 6 inches, with the higher amounts expected over southern end of the Bighorn Mountains. Winds gusting as high as 50 mph. * WHERE...Owl Creek and Bridger Mountains, Bighorn Mountains Southeast, Bighorn Mountains West, and Absaroka Mountains. * WHEN...Until 6 PM MDT this evening. * IMPACTS...Travel could be difficult, especially over mountain passes such as Powder River Pass. |
| Alert: | Winter Storm Warning |
| Area(s): | Lander Foothills |
| Effective: | 2026-05-18 @ 4:14 am -> 2026-05-18 @ 7:00 pm |
| Onset: | 2026-05-18 @ 4:14 am -> 2026-05-18 @ 7:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Riverton WY on 2026-05-18 @ 4:14 am |
| Headline: | Winter Storm Warning issued May 18 at 3:14AM MDT until May 18 at 6:00PM MDT by NWS Riverton WY |
| Description: |
* WHAT...Snow expected. Additional snow accumulations between 5 and 8 inches, with higher amounts near Sinks Canyon Park. * WHERE...Lander Foothills. * WHEN...Until 6 PM MDT this evening. * IMPACTS...Travel could be difficult. The hazardous conditions could impact the Monday morning commute. Heavy snow could break tree limbs as many trees have leafed out. |
| Alert: | Winter Storm Warning |
| Area(s): | Casper Mountain |
| Effective: | 2026-05-18 @ 4:14 am -> 2026-05-18 @ 7:00 pm |
| Onset: | 2026-05-18 @ 4:14 am -> 2026-05-18 @ 7:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Riverton WY on 2026-05-18 @ 4:14 am |
| Headline: | Winter Storm Warning issued May 18 at 3:14AM MDT until May 18 at 6:00PM MDT by NWS Riverton WY |
| Description: |
* WHAT...Heavy snow possible. Additional snow accumulations between 6 and 12 inches possible. Winds could gust as high as 40 mph. * WHERE...Casper Mountain. * WHEN...Until 6 PM MDT this evening. * IMPACTS...Travel could be very difficult. Areas of blowing snow could significantly reduce visibility. The hazardous conditions could impact the Monday morning commute. Heavy snow could break tree limbs as many trees have leafed out. |
| Alert: | Winter Weather Advisory |
| Area(s): | Wind River Mountains West |
| Effective: | 2026-05-18 @ 4:14 am -> 2026-05-18 @ 7:00 pm |
| Onset: | 2026-05-18 @ 4:14 am -> 2026-05-18 @ 7:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Riverton WY on 2026-05-18 @ 4:14 am |
| Headline: | Winter Weather Advisory issued May 18 at 3:14AM MDT until May 18 at 6:00PM MDT by NWS Riverton WY |
| Description: |
* WHAT...Snow expected. Additional snow accumulations between 4 and 8 inches. Winds gusting as high as 60 mph. * WHERE...Wind River Mountains West. * WHEN...Until 6 PM MDT this evening. * IMPACTS...Travel could be difficult, especially along South Pass. The hazardous conditions could impact the Monday morning commute. |
| Alert: | Winter Weather Advisory |
| Area(s): | Pryor/Northern Bighorn Mountains; Northeast Bighorn Mountains |
| Effective: | 2026-05-18 @ 3:06 am -> 2026-05-18 @ 1:00 pm |
| Onset: | 2026-05-18 @ 3:06 am -> 2026-05-18 @ 1:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Billings MT on 2026-05-18 @ 3:06 am |
| Headline: | Winter Weather Advisory issued May 18 at 2:06AM MDT until May 18 at 12:00PM MDT by NWS Billings MT |
| Description: |
* WHAT...Snow and blowing snow. Total snow accumulations between 3 and 6 inches, greatest in the Bighorn Mountains. Winds gusting as high as 45 mph. * WHERE...In Montana, Pryor/Northern Bighorn Mountains. In Wyoming, Northeast Bighorn Mountains. * WHEN...Until noon MDT today. * IMPACTS...Snow and blowing snow will impact back country recreation and travel along Highway 14 through the Bighorn Mountains. |
| Alert: | Winter Storm Warning |
| Area(s): | Sierra Madre Range |
| Effective: | 2026-05-18 @ 2:31 am -> 2026-05-18 @ 5:00 pm |
| Onset: | 2026-05-18 @ 2:31 am -> 2026-05-18 @ 7:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Cheyenne WY on 2026-05-18 @ 2:31 am |
| Headline: | Winter Storm Warning issued May 18 at 1:31AM MDT until May 18 at 6:00PM MDT by NWS Cheyenne WY |
| Description: |
* WHAT...Heavy snow expected. Total snow accumulation 8 to 16 inches, mainly on the eastern side of the Range. Winds gusting as high as 50 mph with periods of blowing and drifting snow. * WHERE...Sierra Madre Range. * WHEN...Until 6 PM MDT this evening. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the Monday morning and evening commutes. Strong winds could cause tree damage. * ADDITIONAL DETAILS...North to northeast facing slopes and ridges will see the highest accumulations, with accumulations much lower on the western side of the range near Dixon and Baggs. |
| Alert: | Winter Weather Advisory |
| Area(s): | Converse County Lower Elevations; Shirley Basin; Central Laramie Range and Southwest Platte County; South Laramie Range Foothills |
| Effective: | 2026-05-18 @ 2:31 am -> 2026-05-18 @ 5:00 pm |
| Onset: | 2026-05-18 @ 2:31 am -> 2026-05-18 @ 7:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Cheyenne WY on 2026-05-18 @ 2:31 am |
| Headline: | Winter Weather Advisory issued May 18 at 1:31AM MDT until May 18 at 6:00PM MDT by NWS Cheyenne WY |
| Description: |
* WHAT...Snow expected. Total snow accumulations 2 to 6 inches. Winds gusting as high as 35 mph. * WHERE...Converse County Lower Elevations, Shirley Basin, Central Laramie Range and Southwest Platte County, and South Laramie Range Foothills. * WHEN...Until 6 PM MDT this evening. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Monday morning and evening commutes. |
| Alert: | Winter Storm Warning |
| Area(s): | South Laramie Range |
| Effective: | 2026-05-18 @ 2:31 am -> 2026-05-18 @ 5:00 pm |
| Onset: | 2026-05-18 @ 2:31 am -> 2026-05-18 @ 7:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Cheyenne WY on 2026-05-18 @ 2:31 am |
| Headline: | Winter Storm Warning issued May 18 at 1:31AM MDT until May 18 at 6:00PM MDT by NWS Cheyenne WY |
| Description: |
* WHAT...Heavy snow. Total snow accumulations 7 to 14 inches expected with locally higher amounts. Winds could gust as high as 30 to 40 mph with some drifting snow expected. * WHERE...South Laramie Range including the Interstate 80 Summit between Cheyenne and Laramie. * WHEN...Until 6 PM MDT this evening. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. |
| Alert: | Winter Storm Warning |
| Area(s): | North Laramie Range; Snowy Range |
| Effective: | 2026-05-18 @ 2:31 am -> 2026-05-18 @ 5:00 pm |
| Onset: | 2026-05-18 @ 2:31 am -> 2026-05-18 @ 7:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Cheyenne WY on 2026-05-18 @ 2:31 am |
| Headline: | Winter Storm Warning issued May 18 at 1:31AM MDT until May 18 at 6:00PM MDT by NWS Cheyenne WY |
| Description: |
* WHAT...Heavy snow. Total snow accumulations 10 to 20 inches expected with locally higher amounts possible. Winds could gust as high as 30 to 40 mph with periods of blowing and drifting snow, especially above 8500 feet. * WHERE...Snowy Range and North Laramie Range. * WHEN...Until 6 PM MDT this evening. * IMPACTS...Heavy wet snow. Roads, and especially bridges, will likely become slick and hazardous. |
| Alert: | Winter Storm Warning |
| Area(s): | Central Carbon County |
| Effective: | 2026-05-18 @ 2:31 am -> 2026-05-18 @ 5:00 pm |
| Onset: | 2026-05-18 @ 2:31 am -> 2026-05-18 @ 7:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Cheyenne WY on 2026-05-18 @ 2:31 am |
| Headline: | Winter Storm Warning issued May 18 at 1:31AM MDT until May 18 at 6:00PM MDT by NWS Cheyenne WY |
| Description: |
* WHAT...Heavy snow and periods of blowing snow. Total snow accumulations 5 to 10 inches expected with locally higher amounts near the mountains. Winds could gust as high as 45 mph. * WHERE...Central Carbon County. * WHEN...Until 6 PM MDT this evening. * IMPACTS...Visibilities may drop below 1/4 mile due to falling and blowing snow. |
| Alert: | Winter Weather Advisory |
| Area(s): | Southwest Carbon County |
| Effective: | 2026-05-18 @ 2:31 am -> 2026-05-18 @ 5:00 pm |
| Onset: | 2026-05-18 @ 2:31 am -> 2026-05-18 @ 7:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Cheyenne WY on 2026-05-18 @ 2:31 am |
| Headline: | Winter Weather Advisory issued May 18 at 1:31AM MDT until May 18 at 6:00PM MDT by NWS Cheyenne WY |
| Description: |
* WHAT...Snow and periods of blowing snow. Total snow accumulations 3 to 6 inches, locally heavier in the northern extent of the zone. Winds gusting as high as 50 mph. * WHERE...Southwest Carbon County. * WHEN...Until 6 PM MDT this evening. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Monday morning and evening commutes. Strong winds could cause tree damage. |
| Alert: | Winter Storm Warning |
| Area(s): | Ferris/Seminoe/Shirley Mountains; North Snowy Range Foothills |
| Effective: | 2026-05-18 @ 2:31 am -> 2026-05-18 @ 5:00 pm |
| Onset: | 2026-05-18 @ 2:31 am -> 2026-05-18 @ 7:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Cheyenne WY on 2026-05-18 @ 2:31 am |
| Headline: | Winter Storm Warning issued May 18 at 1:31AM MDT until May 18 at 6:00PM MDT by NWS Cheyenne WY |
| Description: |
* WHAT...Heavy snow and periods of drifting snow. Total snow accumulations 6 to 12 inches with higher amounts near the mountains. Winds could gust as high as 35 to 45 mph with periods of blowing and drifting snow. * WHERE...North Snowy Range Foothills including Arlington and Elk Mountain along Interstate 80, and Ferris/Seminoe/Shirley Mountains. * WHEN...Until 6 PM MDT this evening. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. Scattered power outages possible due to heavy wet snow on trees and powerlines. |
| Alert: | Winter Weather Advisory |
| Area(s): | Laramie Valley |
| Effective: | 2026-05-18 @ 2:31 am -> 2026-05-18 @ 5:00 pm |
| Onset: | 2026-05-18 @ 2:31 am -> 2026-05-18 @ 7:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Cheyenne WY on 2026-05-18 @ 2:31 am |
| Headline: | Winter Weather Advisory issued May 18 at 1:31AM MDT until May 18 at 6:00PM MDT by NWS Cheyenne WY |
| Description: |
* WHAT...Snow and blowing snow expected. Total snow accumulations between 2 to 6 inches. Winds gusting as high as 35 mph. * WHERE...Laramie Valley. * WHEN...Until 6 PM MDT this evening. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Monday morning and evening commutes. * ADDITIONAL DETAILS...Portions of the Laramie Valley including Laramie itself could see amounts on the lower end due to westerly winds, but portions of the Valley including I-80 may see on the higher end of these amounts. |
| Alert: | Freeze Watch |
| Area(s): | Ferris/Seminoe/Shirley Mountains; Shirley Basin; Central Carbon County; North Snowy Range Foothills; Southwest Carbon County |
| Effective: | 2026-05-18 @ 2:15 am -> 2026-05-18 @ 5:30 pm |
| Onset: | 2026-05-18 @ 10:00 pm -> 2026-05-19 @ 11:00 am |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Cheyenne WY on 2026-05-18 @ 2:15 am |
| Headline: | Freeze Watch issued May 18 at 1:15AM MDT until May 19 at 10:00AM MDT by NWS Cheyenne WY |
| Description: |
* WHAT...Sub-freezing temperatures as low as 15 possible. * WHERE...Central Carbon County, Ferris/Seminoe/Shirley Mountains, North Snowy Range Foothills, Shirley Basin, and Southwest Carbon County. * WHEN...From this evening through Tuesday morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. |
| Alert: | Freeze Warning |
| Area(s): | Niobrara County |
| Effective: | 2026-05-18 @ 2:15 am -> 2026-05-18 @ 5:30 pm |
| Onset: | 2026-05-18 @ 9:00 pm -> 2026-05-19 @ 11:00 am |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Cheyenne WY on 2026-05-18 @ 2:15 am |
| Headline: | Freeze Warning issued May 18 at 1:15AM MDT until May 19 at 10:00AM MDT by NWS Cheyenne WY |
| Description: |
* WHAT...For the Freeze Warning early this morning, sub-freezing temperatures as low as 26 expected. For the Freeze Warning tomorrow night, sub-freezing temperatures as low as 22 possible. * WHERE...Niobrara County. * WHEN...For the first Freeze Warning, from 5 AM to 10 AM MDT this morning. For the second Freeze Warning, from 8 PM this evening to 10 AM MDT Tuesday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. |
| Alert: | Freeze Warning |
| Area(s): | Scotts Bluff; North Sioux; South Sioux; Converse County Lower Elevations; East Platte County; Goshen County |
| Effective: | 2026-05-18 @ 2:15 am -> 2026-05-18 @ 5:30 pm |
| Onset: | 2026-05-18 @ 9:00 pm -> 2026-05-19 @ 11:00 am |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Cheyenne WY on 2026-05-18 @ 2:15 am |
| Headline: | Freeze Warning issued May 18 at 1:15AM MDT until May 19 at 10:00AM MDT by NWS Cheyenne WY |
| Description: |
* WHAT...Sub-freezing temperatures as low as 21 expected. * WHERE...Portions of the panhandle of Nebraska, and east central and southeast Wyoming. * WHEN...From 8 PM this evening to 10 AM MDT Tuesday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. |
| Alert: | Freeze Watch |
| Area(s): | Dawes; Box Butte; Banner; Morrill; Kimball; Cheyenne; Central Laramie Range and Southwest Platte County; Upper North Platte River Basin; Laramie Valley; South Laramie Range; South Laramie Range Foothills; Central Laramie County; East Laramie County |
| Effective: | 2026-05-18 @ 2:15 am -> 2026-05-18 @ 5:30 pm |
| Onset: | 2026-05-19 @ 1:00 am -> 2026-05-19 @ 11:00 am |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Cheyenne WY on 2026-05-18 @ 2:15 am |
| Headline: | Freeze Watch issued May 18 at 1:15AM MDT until May 19 at 10:00AM MDT by NWS Cheyenne WY |
| Description: |
* WHAT...Sub-freezing temperatures as low as 16 possible. * WHERE...Portions of panhandle Nebraska and south central and southeast Wyoming. * WHEN...From late tonight through Tuesday morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. |
| Alert: | Freeze Warning |
| Area(s): | Niobrara County |
| Effective: | 2026-05-18 @ 2:15 am -> 2026-05-18 @ 5:30 pm |
| Onset: | 2026-05-18 @ 6:00 am -> 2026-05-18 @ 11:00 am |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Cheyenne WY on 2026-05-18 @ 2:15 am |
| Headline: | Freeze Warning issued May 18 at 1:15AM MDT until May 18 at 10:00AM MDT by NWS Cheyenne WY |
| Description: |
* WHAT...For the Freeze Warning early this morning, sub-freezing temperatures as low as 26 expected. For the Freeze Warning tomorrow night, sub-freezing temperatures as low as 22 possible. * WHERE...Niobrara County. * WHEN...For the first Freeze Warning, from 5 AM to 10 AM MDT this morning. For the second Freeze Warning, from 8 PM this evening to 10 AM MDT Tuesday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. |
| Alert: | Freeze Warning |
| Area(s): | Northern Campbell; Southern Campbell; Western Crook; Weston County Plains; Newcastle; Northeastern Crook |
| Effective: | 2026-05-17 @ 11:56 pm -> 2026-05-18 @ 11:00 am |
| Onset: | 2026-05-18 @ 6:00 am -> 2026-05-18 @ 11:00 am |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Rapid City SD on 2026-05-17 @ 11:56 pm |
| Headline: | Freeze Warning issued May 17 at 10:56PM MDT until May 18 at 10:00AM MDT by NWS Rapid City SD |
| Description: |
* WHAT...Sub-freezing temperatures as low as 29 expected. * WHERE...A portion of northeast Wyoming. * WHEN...From 5 AM to 10 AM MDT Monday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. |
| Alert: | Winter Weather Advisory |
| Area(s): | Western Uinta Mountains; Southwest Wyoming |
| Effective: | 2026-05-17 @ 11:08 pm -> 2026-05-18 @ 2:15 pm |
| Onset: | 2026-05-17 @ 11:08 pm -> 2026-05-19 @ 1:00 am |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Salt Lake City UT on 2026-05-17 @ 11:08 pm |
| Headline: | Winter Weather Advisory issued May 17 at 10:08PM MDT until May 19 at 12:00AM MDT by NWS Salt Lake City UT |
| Description: |
* WHAT...Snow expected. Total snow accumulations of 6 to 14 inches for the Western Uinta Mountains with locally higher amounts further east into the Uinta mountains, and 2 to 6 inches for southwest Wyoming with locally in excess of 10 inches closer to the north slopes of the Uintas. * WHERE...In Utah, Western Uinta Mountains. In Wyoming, Southwest Wyoming. * WHEN...Until midnight MDT Monday Night. * IMPACTS...Travel could be difficult at times. Traction law restrictions may be enacted. |