The combination of a stationary front over the area, a shortwave moving across the area and strong jet dynamics brought rounds of severe thunderstorms over northern and central Wyoming. The hardest hit town this day was Lovell where a combination of 70 mph winds and golf ball size hail produced widespread damage with hundreds of broken windows and many houses with damaged siding. Strong winds also downed many trees and limbs. The same storm produced 79 mph winds at the Greybull airport. Elsewhere, severe thunderstorms moved through Johnson and Natrona Counties. There were numerous reports of quarter to golf ball size hail from west of Buffalo through Midwest and into Casper. A weak landspout tornado also touched down north of Casper. Another storm produced quarter size hail in Thermopolis.

Hail in JOHNSON, WYOMING
From 26-JUL-18 11:50:00 to 26-JUL-18 12:30:00 (MST-7)
Location: BUFFALO
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A thunderstorm developed over the Bighorn Mountains and became severe as it moved south-southeast across Johnson County. There were multiple reports of quarter to golf ball size hail along the path by spotters and on social media.

Hail in NATRONA, WYOMING
From 26-JUL-18 13:55:00 to 26-JUL-18 14:05:00 (MST-7)
Location: MIDWEST
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trained spotters and a Natrona County Sheriff's Deputy reported quarter to golf ball size hail in Midwest and Edgerton.

Tornado in NATRONA, WYOMING
From 26-JUL-18 14:32:00 to 26-JUL-18 14:33:00 (MST-7)
Location: BAR NUNN
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Two trained spotters photographed a landspout tornado to the north of Casper. The tornado remained over open county and caused no damage.

Hail in JOHNSON, WYOMING
From 26-JUL-18 17:25:00 to 26-JUL-18 17:35:00 (MST-7)
Location: KAYCEE
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotters reported nickel to ping pong ball size hail in the vicinity of Kaycee.

Hail in HOT SPRINGS, WYOMING
From 26-JUL-18 17:20:00 to 26-JUL-18 17:25:00 (MST-7)
Location: THERMOPOLIS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotters reported up to quarter size hail around Thermopolis.

Hail in BIG HORN, WYOMING
From 26-JUL-18 17:20:00 to 26-JUL-18 17:50:00 (MST-7)
Location: FRANNIE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A severe thunderstorm crossed the border from Montana and brought up to golf ball size hail across much of northern Big Horn County. Lovell was the hardest hit community where there was widespread damage. One official estimated that over 60 percent of the homes had damage, mainly from damaged siding and broken windows from the hail bring driven by winds over 70 mph. Large hail was also occurred in Frannie and Cowley.

Hail in NATRONA, WYOMING
From 26-JUL-18 14:30:00 to 26-JUL-18 14:50:00 (MST-7)
Location: BAR NUNN
Magnitude: 1.50 
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotters reported hail ranging from quarter to ping pong ball size from Bar Nunn into the east side of Casper. Some of larger hail damaged a carport in Casper.

Thunderstorm Wind in BIG HORN, WYOMING
From 26-JUL-18 17:22:00 to 26-JUL-18 18:30:00 (MST-7)
Location: FRANNIE
Magnitude: 69.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

A severe thunderstorm brought high winds through much of northern Big Horn County. The strongest wind gust recorded was 79 mph at the Greybull Airport. Other notable gusts included 62 mph at Cowley and 59 mph at Frannie and Lovell. The strong wind combined with golf ball size hail to produce widespread damage across the city of Lovell.