TL;DR

A brief tornado touched down 2 miles north of Waverly, Iowa at 2040 UTC (3:40 PM CDT) Friday evening, August 7, confirmed by video submitted via social media. The tornado was part of a widespread severe weather outbreak that produced 261 wind reports, 39 hail reports, and 1 tornado report across 23 states. No EF rating has been issued yet.

What happened near Waverly

The National Weather Service office in Des Moines (DMX) confirmed a brief tornado touchdown 2 miles north of Waverly, Iowa Friday evening. The tornado occurred at 2040 UTC (3:40 PM CDT) and was verified through video footage received via social media.

Waverly is a city of approximately 10,000 residents in Bremer County in northeast Iowa, situated along the Cedar River. The community lies roughly 15 miles west of Waterloo and 110 miles northeast of Des Moines.

The National Weather Service has not yet issued an EF rating for the tornado. Damage surveys typically occur in the days following a tornado event, and the NWS will release a rating once the assessment is complete. The local storm report describes the event as a "brief touchdown," suggesting the tornado was short-lived.

A widespread severe weather day

Friday's tornado near Waverly was one small piece of a much larger severe weather picture. According to NOAA Storm Prediction Center (SPC) data, the 24-hour period ending Saturday morning produced:

  • 1 tornado report (Iowa)
  • 39 hail reports across multiple states
  • 261 wind reports spanning 23 states from the Plains to the East Coast

The wind reports dominated the severe weather tally, with damaging gusts, downed trees, and power line damage reported from Oklahoma and Texas through the Ohio Valley and into the Mid-Atlantic and Northeast. States affected by severe weather included Alabama, Arizona, Arkansas, Connecticut, Indiana, Iowa, Kansas, Kentucky, Maryland, Massachusetts, Minnesota, Missouri, Nevada, New Mexico, Ohio, Oklahoma, Pennsylvania, Tennessee, Texas, Virginia, and West Virginia.

Significant hail in northeast Iowa

The Waverly area experienced more than just the tornado. Hail reports clustered across northeast Iowa during the same timeframe, with several notable measurements:

  • Ryan, Iowa (2214 UTC): Golf ball to softball sized hail (up to 4.50 inches), the largest hail report of the day
  • Fairbank, Iowa (2115 UTC): 1.75-inch hail
  • 5 miles north of Dunkerton (2102 UTC): 1.25-inch hail
  • 5 miles southeast of Readlyn (2058 UTC): 1.25-inch hail

The Ryan hail report is particularly significant. Softball-sized hail (4.5 inches in diameter) is capable of causing severe damage to vehicles, roofs, and crops. Ryan is located approximately 25 miles south of Waverly, suggesting a corridor of intense thunderstorm activity moved through the region Friday evening.

Where the storms developed

SPC's Day 1 Convective Outlook for August 8 describes ongoing uncertainty in the forecast across the Northern and Central Plains into Minnesota, Iowa, and Missouri. The outlook notes that "a strongly unstable airmass is forecast to develop by early afternoon across much of the region with 60s to lower 70s boundary layer dewpoints beneath steep 700-500 mb lapse rates."

The outlook continues: "Several areas of convection may develop during the late afternoon/evening near the surface trough, and overnight near the southward-sagging surface front." SPC forecasters identified the potential for large hail and severe gusts with the more intense thunderstorms across the region.

Friday's storms developed in an environment characterized by strong instability and adequate wind shear to support rotating updrafts. The brief nature of the Waverly tornado suggests it may have been a landspout or a short-lived mesocyclone-driven tornado that dissipated quickly.

Context: Iowa tornado activity in August

Tornadoes in Iowa during August are not unusual, though they are less common than during the state's peak tornado season from April through June. August tornadoes in Iowa typically form in environments with strong heating, high humidity, and passing disturbances that provide the necessary lift and wind shear.

Waverly has experienced tornadoes in the past, as have many communities across northeast Iowa. The region's relatively flat terrain and position in the transition zone between the Great Plains and the Midwest make it susceptible to severe thunderstorms during the warm season.

Damage reports across the region

Beyond the tornado, wind damage reports painted a picture of widespread thunderstorm impacts. In Iowa alone, multiple reports of downed trees and power lines came in from communities including Forest City, Manly, Thornton, and Greene.

The wind damage extended well beyond Iowa. Notable reports included:

  • Oklahoma: Seven to eight power poles blown down along Richland Road near Yukon; large metal shipping containers blown over near Chandler
  • Ohio: Multiple trees downed in the Dayton metro area, including West Carrollton, Kettering, and Xenia
  • Pennsylvania: Trees and wires down across multiple counties from the Susquehanna Valley into the Poconos

The sheer geographic spread—from Oklahoma to the Northeast—illustrates the scale of Friday's severe weather event. While no single storm system was responsible for all the reports, multiple clusters of thunderstorms developed across the eastern two-thirds of the nation in response to heat, humidity, and weak disturbances aloft.

What comes next

As of Saturday morning, SPC has outlined continued severe weather potential across portions of the Mid-Atlantic, Northeast, Central Plains, and Upper Midwest. The Day 1 outlook highlights a Slight Risk for scattered strong to severe thunderstorms capable primarily of damaging gusts across the Mid-Atlantic states into southern New England.

For Iowa and the surrounding region, additional thunderstorms are possible Saturday into Saturday night as a surface front sags southward and a low-level jet increases across the Central Plains during the evening. SPC notes that "large hail and severe gusts will be possible with the more intense thunderstorms."

Residents across the region should remain weather-aware, particularly during the late afternoon and evening hours when heating and instability peak. Have multiple ways to receive warnings, and know where to shelter if a tornado warning is issued for your area.

Staying alert during active severe weather

Friday's tornado near Waverly serves as a reminder that severe weather can develop quickly, even during what appears to be a routine summer afternoon. The brief nature of the tornado meant that warning lead time was likely minimal—these short-lived events can touch down and dissipate within minutes.

For those in areas prone to severe weather, especially during active patterns, maintaining situational awareness is critical. Monitor radar, watch for watches and warnings, and have a plan to take shelter immediately if a tornado warning is issued.

Nighttime and early evening tornadoes present additional challenges. Many people are outdoors, commuting, or engaged in activities that make it harder to receive warnings. Third-party weather apps are silenced by Do Not Disturb, though Wireless Emergency Alerts for tornado warnings still break through on most phones. For those who want an additional layer of protection, especially at night, phone-based alert systems that can bypass Do Not Disturb offer peace of mind.

VORTEX is a free web app at vortexintel.app that monitors severe weather nationwide. Pro ($4.99/month) places phone calls to your phone when a tornado or flash flood warning is issued for a location you care about — calls can ring through Do Not Disturb once you enable Emergency Bypass for the number, unlike most third-party app notifications.