Upton, WY Hail Storm – August 2025

What Happened

A severe hail storm moved through Upton, Wyoming, on August 13, 2025, producing repeated 1-inch hail alerts and spotter-verified ground reports during the afternoon and evening. The storm produced its first hail alert at 2:57 PM MDT, then continued to cycle through the area with additional alerts at 4:17 PM, 4:48 PM, 5:10 PM, 5:40 PM, 6:32 PM, and 7:59 PM MDT.

The early alerts came in with radar and spotter-verified confidence. Later alerts kept the same hail size estimate and added dual-polarization radar detections at 4:48 PM, 5:40 PM, and 6:32 PM MDT. The sequence shows a long-lived hail core crossing the Upton metro area rather than a single short burst.

Ground reports matched the radar trend. At 3:24 PM MDT, a spotter reported tree limbs down in town with 0.75-inch hail. Another spotter-verified mPING report came in at 5:06 PM MDT with 0.75-inch hail. Both reports landed during the middle of the event, while hail alerts were still coming through the warning area.

By late afternoon, the storm had already produced multiple hail passes over the same general area. The final hail alert arrived at 7:59 PM MDT, ending a several-hour severe weather window for Upton.

Damage Assessment

The first field reports point to isolated but real surface impact in town. Tree limbs were down by 3:24 PM MDT, and the later mPING report confirmed ongoing hail at 5:06 PM MDT. Both reports came in below the 1-inch alert size, with 0.75-inch hail observed at the ground.

That pattern fits a storm with repeated hail shafts and enough wind to move small tree debris. The damage notes were limited, but they were specific to Upton and tied to the same afternoon storm sequence. No broader damage survey was reported in the source material.

The report set does not show widespread structural loss, but it does show enough tree impact to confirm that the storm reached the surface with measurable effect. The hail alerts and the spotter observations lined up across the same part of the day, from mid-afternoon into early evening.

For contractors, the most useful takeaway is the duration. This was not a single isolated hail pulse. It was a multi-hour event with repeated alerts and at least two ground reports inside the warning area. Roof, siding, gutter, and soft-metal checks should focus on properties that sat under the storm path during the afternoon and evening cycle.

What Contractors Should Know

Start with the neighborhoods that were in the warning area during the first reported hail window around 3 PM MDT. The earliest spotter report came from town, and that is where tree limbs were already down. In a compact market like Upton, that can translate into mixed exterior impacts across nearby blocks, especially where trees, fences, and light aluminum components were exposed.