Thermopolis, WY Hail Storm – July 2025

Thermopolis, WY saw a concluded hail storm on July 30, 2025, with a maximum confirmed hail size of 1.5 inches. The event produced multiple hail alerts through the afternoon and early evening.

What Happened

The storm first produced a 1.25-inch hail alert at 4:10 PM MDT, followed by a 1-inch hail alert at 4:37 PM MDT. Additional alerts came at 5:39 PM MDT and 5:53 PM MDT, both at 1 inch.

Hail intensity increased again in the evening. A 1.25-inch alert was issued at 6:30 PM MDT, then a 1-inch alert at 6:57 PM MDT. Another 1.25-inch alert followed at 7:02 PM MDT. The final alert came at 7:50 PM MDT, with 1.5-inch hail detected by dual-polarization radar confidence.

The eight alert sequence shows a storm that held severe hail potential for several hours across the Thermopolis area. Peak hail size reached 1.5 inches before the event ended.

Damage Assessment

Hail in the 1-inch to 1.5-inch range can affect roofing, soft metals, vehicle surfaces, skylights, gutters, and window screens. In Thermopolis, the repeated hail alerts suggest more than one hail-producing core moved through the area during the event window.

At 1.25 inches, hail can crack older roof shingles, dent aluminum trim, and leave visible marks on vehicles. At 1.5 inches, the risk rises for bruised shingles, punctured roof membranes on weaker materials, broken screen fabric, and heavier vehicle damage. Properties with aging roofs, exposed HVAC coils, or thin-gauge metal exterior components should be checked first.

The spread of alert sizes from 1 inch to 1.5 inches points to uneven impacts across the warning area. Some addresses may have seen only brief hail, while others were hit by stronger pulses later in the storm.

What Contractors Should Know

Field crews should start with roofs, gutters, window lines, and soft metal trim. Look for fresh impact marks, displaced granules, denting on ridge caps and flashing, and screen tears around exposed openings. Pay close attention to south- and west-facing slopes if the storm moved through late in the day.

Vehicle lots, RV parks, agricultural structures, and outbuildings are likely inspection targets after a storm with repeated hail alerts. Document diameter, count, and location of each impact pattern. Use time-stamped photos before cleanup begins. In a multi-alert event, damage can vary sharply block by block.

Contractors should treat the 1.5-inch peak as a signal to check for roof claims, accessory damage, and collateral impacts on metal systems. Smaller hail reports earlier in the day do not rule out stronger damage later, especially when the alert sequence escalates again after a lull.

The Strike Map shows the precise hail track data for this Thermopolis event.