An unseasonably moist Pacific shortwave trough lifted across western Colorado and produced scattered to numerous showers beginning the night of May 10th. A break in the clouds the morning of May 11th fueled the atmosphere's instability and allowed showers and thunderstorms to redevelop across the region. The stronger storms produced frequent lightning, heavy rain, gusty winds to 63 MPH, and large hail.

Hail in MONTROSE, COLORADO
From 11-MAY-20 13:40:00 to 11-MAY-20 13:50:00 (MST-7)
Location: OLATHE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

A severe thunderstorm produced large hail estimated to be the size of quarters in Olathe.

Thunderstorm Wind in MESA, COLORADO
From 11-MAY-20 15:44:00 to 11-MAY-20 15:54:00 (MST-7)
Location: MACK
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained weather spotter's automated instrument recorded a peak wind gust of 62 MPH from a severe thunderstorm.

Hail in MESA, COLORADO
From 11-MAY-20 16:28:00 to 11-MAY-20 16:38:00 (MST-7)
Location: COLLBRAN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

A severe thunderstorm produced large hail estimated to be the size of quarters east-northeast of Collbran.

Hail in MESA, COLORADO
From 11-MAY-20 15:45:00 to 11-MAY-20 15:55:00 (MST-7)
Location: DE BEQUE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A severe thunderstorm produced large hail estimated to be the size of quarters south-southeast of De Beque. Dispatch reported numerous vehicles had to shelter under the highway overpass due to the large hail on Interstate 70 south of De Beque with resulting slowdowns on the highway.

Thunderstorm Wind in MESA, COLORADO
From 11-MAY-20 15:44:00 to 11-MAY-20 15:54:00 (MST-7)
Location: MACK
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

An automated weather station recorded a peak wind gust of 63 MPH from a severe thunderstorm.

Hail in MESA, COLORADO
From 11-MAY-20 16:18:00 to 11-MAY-20 16:28:00 (MST-7)
Location: COLLBRAN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A severe thunderstorm produced large hail estimated to be the size of quarters north of Collbran.

Thunderstorm Wind in ARCHULETA, COLORADO
From 11-MAY-20 17:15:00 to 11-MAY-20 17:25:00 (MST-7)
Location: PAGOSA SPGS ARPT
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

The automated weather station at the Stevens Field Airport in Pagosa Springs recorded a peak wind gust of 59 MPH from a severe thunderstorm.

Hail in MESA, COLORADO
From 11-MAY-20 15:43:00 to 11-MAY-20 15:53:00 (MST-7)
Location: DE BEQUE
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A severe thunderstorm produced large hail measured to be the size of half dollars south-southeast of De Beque.

Thunderstorm Wind in MESA, COLORADO
From 11-MAY-20 15:40:00 to 11-MAY-20 15:50:00 (MST-7)
Location: REDLANDS
Magnitude: 43.00 EG
Property damage: 0.02K
Crop damage: 0.00K
Reported by: NWS Employee

Thunderstorm wind gusts estimated to be around 50 MPH produced damage to an NWS employee's fence.