Ralph, SD Hail Storm – August 2026

A strong hail-producing storm moved through Ralph, SD on August 17, 2026, producing 2.94-inch hail and a multi-hour radar signature that crossed the community from mid-afternoon into the evening.

What Happened

Dual-polarization radar first flagged large hail signatures near the Ralph area at 2:15 PM CDT, with radar-detected hail signatures recurring through mid- and late afternoon. Between about 3 PM and 4 PM CDT, multiple radar-derived alerts showed multi-inch hail signatures near the metro. The NWS issued warning-area notices at 4:10 PM CDT and again later in the afternoon as the storm maintained intensity. Radar-detected hail alerts continued through the early evening, with intermittent NWS warning-only alerts later in the period.

Local observers reported the strongest near-surface effects in the early evening. Spotters in Ralph recorded wind gusts to 50 mph and observed roughly three-quarter-inch hail around 7:00 PM CDT. Those spotter-verified conditions coincided with a series of radar returns that persisted into the 7 PM hour. The storm sequence extended into the late evening with lower-intensity radar returns and final NWS warning-only messaging near 8:49 PM CDT.

Damage Assessment

Field reports and radar indicate surface impacts concentrated within and immediately around Ralph during the evening observation window. Spotters documented 0.7-inch hail and 50 mph gusts around 7:00 PM CDT. The supplied local storm reports do not include spotter-verified roof failures or collapsed structures for Ralph in the supplied data.

Radar-detected multi-inch signatures earlier in the afternoon indicate a higher hail potential along portions of the track that passed near but not directly over the two spotter locations. The mismatch between larger radar signatures and spotter observations suggests that the most severe hail signatures passed through less-populated or agricultural sections just outside the immediate spotter locations. Reported wind gusts to 50 mph increased the likelihood of limb breakage and tree damage in the town's residential areas. Vehicle and siding inspections in the central Ralph area are appropriate where residents reported broken limbs or denting.

What Contractors Should Know

Prioritize inspections that start where spotters were located in Ralph and then move along the radar-derived hail track indicated by the midday to evening alerts. Begin with exterior roofing inspections for granule loss, shingle bruising, and impact pocks on low-slope assemblies. Photograph suspected hail impacts with a ruler or coin for scale and record the local time of each image using the device timestamp.

For siding and vehicle work, focus on body dents, cracked trim, and perforated screens in neighborhoods closest to the reported 7:00 PM CDT observations. Check gutters and downspouts for blockages caused by shredded leaves or broken limb fragments consistent with 50 mph wind gusts. Prioritize structures with known pre-existing vulnerabilities such as aged asphalt shingles or vinyl siding installed without sufficient backer support.