Yellowstone National Park, Wyoming
Regional Weather Alerts
| Alert: | Special Weather Statement |
| Area(s): | Missoula/Bitterroot Valleys; Bitterroot/Sapphire Mountains |
| Effective: | 2026-05-27 @ 7:22 pm -> 2026-05-27 @ 7:45 pm |
| Onset: | 2026-05-27 @ 7:22 pm |
| Severity: | Moderate |
| Certainty: | Observed |
| Urgency: | Expected |
| Issued By: | NWS Missoula MT on 2026-05-27 @ 7:22 pm |
| Headline: | Special Weather Statement issued May 27 at 6:22PM MDT by NWS Missoula MT |
| Description: |
At 622 PM MDT, Doppler radar was tracking a strong thunderstorm 11 miles east of Woodside, or 12 miles east of Hamilton, moving northwest at 20 mph. HAZARD...Wind gusts up to 40 mph and penny size hail. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Minor damage to outdoor objects is possible. Locations impacted include... Bell Crossing. |
| Alert: | Special Weather Statement |
| Area(s): | East Glacier Park Region; Little Belt and Highwood Mountains; Big Belt, Bridger and Castle Mountains; Northwest Beaverhead County; Ruby Mountains and Southern Beaverhead Mountains; Gallatin and Madison County Mountains and Centennial Mountains |
| Effective: | 2026-05-27 @ 5:57 pm -> 2026-05-27 @ 8:00 pm |
| Onset: | 2026-05-27 @ 5:57 pm |
| Severity: | Moderate |
| Certainty: | Observed |
| Urgency: | Expected |
| Issued By: | NWS Great Falls MT on 2026-05-27 @ 5:57 pm |
| Headline: | Special Weather Statement issued May 27 at 4:57PM MDT by NWS Great Falls MT |
| Description: |
Isolated to widely scattered thunderstorms have developed over the higher terrain of Southwest, Central, and North Central Montana; with the primary hazards from these storms being gusty winds and localized heavy rainfall. Wind gusts beneath the strongest thunderstorms will mainly range from 35 to 45 mph, most notably across Southwest Montana. Heavy rainfall with hourly rates of between 0.25" to 0.75" are also possible with the stronger storms, which may lead to localized rises on creeks and streams. |
| Alert: | Red Flag Warning |
| Area(s): | Fort Peck Reservation and Daniels/Roosevelt/Sheridan Counties; Dawson/McCone/Prairie/Richland/Wibaux Counties |
| Effective: | 2026-05-27 @ 1:54 pm -> 2026-05-28 @ 7:00 am |
| Onset: | 2026-05-27 @ 1:54 pm -> 2026-05-27 @ 11:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-05-27 @ 1:54 pm |
| Headline: | Red Flag Warning issued May 27 at 12:54PM MDT until May 27 at 10:00PM MDT by NWS Glasgow MT |
| Description: |
...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TO 10 PM MDT THURSDAY FOR LOW RELATIVE HUMIDITY AND STRONG WINDS FOR FIRE WEATHER ZONES 120 AND 122... * AFFECTED AREA...Fire weather zones 120 and 122. * WIND...Southeast at 15 to 25 mph with gusts to 40 mph. * HUMIDITY...As low as 14 percent. * IMPACTS...Any fires that develop will likely spread rapidly. Outdoor burning is not recommended. |
| Alert: | Red Flag Warning |
| Area(s): | Fort Peck Reservation and Daniels/Roosevelt/Sheridan Counties; Dawson/McCone/Prairie/Richland/Wibaux Counties |
| Effective: | 2026-05-27 @ 1:54 pm -> 2026-05-28 @ 7:00 am |
| Onset: | 2026-05-28 @ 1:00 pm -> 2026-05-28 @ 11:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-05-27 @ 1:54 pm |
| Headline: | Red Flag Warning issued May 27 at 12:54PM MDT until May 28 at 10:00PM MDT by NWS Glasgow MT |
| Description: |
...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TO 10 PM MDT THURSDAY FOR LOW RELATIVE HUMIDITY AND STRONG WINDS FOR FIRE WEATHER ZONES 120 AND 122... * AFFECTED AREA...Fire weather zones 120 and 122. * WIND...Southeast at 15 to 25 mph with gusts to 40 mph. * HUMIDITY...As low as 14 percent. * IMPACTS...Any fires that develop will likely spread rapidly. Outdoor burning is not recommended. |
| Alert: | Heat Advisory |
| Area(s): | Central and Southeast Phillips; Central and Southern Valley; Garfield; McCone |
| Effective: | 2026-05-27 @ 1:45 pm -> 2026-05-28 @ 6:00 am |
| Onset: | 2026-05-27 @ 1:45 pm -> 2026-05-28 @ 11:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-05-27 @ 1:45 pm |
| Headline: | Heat Advisory issued May 27 at 12:45PM MDT until May 28 at 10:00PM MDT by NWS Glasgow MT |
| Description: |
* WHAT...For the Lake Wind Advisory, southeast winds 15 to 25 mph with gusts up to 35 mph. For the Heat Advisory, heat index values up to 101 are expected with little to no overnight recovery. * WHERE...Central and Southeast Phillips, Central and Southern Valley, Garfield, and McCone Counties. * WHEN...For the Lake Wind Advisory, until 4 AM MDT Friday. For the Heat Advisory, until 10 PM MDT Thursday. * IMPACTS...Strong winds and rough waves on area lakes will create hazardous conditions for small craft. Hot temperatures and high humidity may cause heat illnesses. |
| Alert: | Heat Advisory |
| Area(s): | Daniels; Sheridan; Western Roosevelt; Richland; Dawson; Prairie; Wibaux; Northern Phillips; Northern Valley; Eastern Roosevelt |
| Effective: | 2026-05-27 @ 1:45 pm -> 2026-05-28 @ 6:00 am |
| Onset: | 2026-05-27 @ 1:45 pm -> 2026-05-28 @ 11:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-05-27 @ 1:45 pm |
| Headline: | Heat Advisory issued May 27 at 12:45PM MDT until May 28 at 10:00PM MDT by NWS Glasgow MT |
| Description: |
* WHAT...Heat index values up to 101 are expected with little to no overnight recovery. * WHERE...Daniels, Dawson, Eastern Roosevelt, Northern Phillips, Northern Valley, Prairie, Richland, Sheridan, Western Roosevelt, and Wibaux Counties. * WHEN...Until 10 PM MDT Thursday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. |
| Alert: | Lake Wind Advisory |
| Area(s): | Petroleum |
| Effective: | 2026-05-27 @ 1:45 pm -> 2026-05-28 @ 6:00 am |
| Onset: | 2026-05-27 @ 1:45 pm -> 2026-05-29 @ 5:00 am |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-05-27 @ 1:45 pm |
| Headline: | Lake Wind Advisory issued May 27 at 12:45PM MDT until May 29 at 4:00AM MDT by NWS Glasgow MT |
| Description: |
* WHAT...Southeast winds 5 to 15 mph with gusts up to 30 mph. * WHERE...Petroleum County. * WHEN...Until 4 AM MDT Friday. * IMPACTS...Strong winds and rough waves on area lakes will create hazardous conditions for small craft. |
| Alert: | Lake Wind Advisory |
| Area(s): | Central and Southeast Phillips; Central and Southern Valley; Garfield; McCone |
| Effective: | 2026-05-27 @ 1:45 pm -> 2026-05-28 @ 6:00 am |
| Onset: | 2026-05-27 @ 1:45 pm -> 2026-05-29 @ 5:00 am |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-05-27 @ 1:45 pm |
| Headline: | Lake Wind Advisory issued May 27 at 12:45PM MDT until May 29 at 4:00AM MDT by NWS Glasgow MT |
| Description: |
* WHAT...For the Lake Wind Advisory, southeast winds 15 to 25 mph with gusts up to 35 mph. For the Heat Advisory, heat index values up to 101 are expected with little to no overnight recovery. * WHERE...Central and Southeast Phillips, Central and Southern Valley, Garfield, and McCone Counties. * WHEN...For the Lake Wind Advisory, until 4 AM MDT Friday. For the Heat Advisory, until 10 PM MDT Thursday. * IMPACTS...Strong winds and rough waves on area lakes will create hazardous conditions for small craft. Hot temperatures and high humidity may cause heat illnesses. |
| Alert: | Heat Advisory |
| Area(s): | Hill County; Northern Blaine County |
| Effective: | 2026-05-27 @ 12:18 pm -> 2026-05-27 @ 10:00 pm |
| Onset: | 2026-05-27 @ 12:18 pm -> 2026-05-27 @ 10:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Great Falls MT on 2026-05-27 @ 12:18 pm |
| Headline: | Heat Advisory issued May 27 at 11:18AM MDT until May 27 at 9:00PM MDT by NWS Great Falls MT |
| Description: |
* WHAT...Afternoon temperatures in the middle to upper 90s today. * WHERE...Hill County and Northern Blaine County. * WHEN...Until 9 PM MDT this evening. * IMPACTS...Hot temperatures may cause heat illnesses. |