Iowa Storm Alerts
Active National Weather Service hail, wind, thunderstorm, tornado, tropical and winter storm alerts covering Iowa, with the counties each one names and the office that issued it — plus what the state’s severe-weather season looks like and how each of these events actually damages a roof.
Below that, in its own lane, the smoke and fire family: fire weather, dense smoke, air quality, blowing dust and volcanic ashfall.
0 active alerts · read from the National Weather Service at Aug 26, 1:54 AM EDT · refreshed every 10 minutes
This page is informational and is not a safety resource. It exists to show roofing professionals where storm damage has been reported, and it is refreshed on a ten-minute cycle, so it can lag the Weather Service.
During an active weather event, the authority is weather.gov and your local emergency management agency. Follow them, not this page.
Active storm alerts in Iowa
Reproduced exactly as the National Weather Service issued them. Alerts frequently cross state lines, so a county list may name counties in a neighbouring state. Smoke and fire alerts are reported separately, in their own lane below.
No active alerts
The National Weather Service has no active hail, wind, thunderstorm, tornado, tropical or winter storm alerts covering Iowa as of this refresh. This is the normal state most days, and this page fills itself the moment NWS issues something.
Radar over Iowa
Straight from radar.weather.gov and regenerated by NOAA roughly every two minutes.
NWS radar — the Upper Mississippi Valley
Where precipitation is falling over Iowa right now. The National Weather Service publishes these mosaics by region rather than by state, so the frame runs past the state line and neighbouring states are visible in it. Radar shows precipitation, not damage — a return over a county is not evidence that any particular building was hit.
Radar imagery: the National Weather Service. Served directly from radar.weather.gov, a free US Government service, and regenerated by NOAA roughly every two minutes — your browser picks up new frames on its own. This site does not process, re-colour or re-time the imagery; it is the Weather Service’s own mosaic, unmodified. weather.gov
This radar is informational and is not a safety resource. During an active weather event, the authority is weather.gov and your local emergency management agency. Follow them, not this page.
Smoke & fire lane
Smoke & fire alerts in Iowa
The National Weather Service issues a separate family of alerts for fire weather, dense smoke, air quality, blowing dust and volcanic ashfall. This lane reports that family for Iowa, kept apart from the storm alerts above because the two answer different questions.
Wildfire smoke is what drives smoke-damage losses, and it reaches a building through the same vents that keep an attic dry — which is why it belongs on a roofing page at all. Alerts describing particulate already in the air are listed ahead of fire-weather forecasts; that ordering is this lane’s own and is not a Weather Service ranking.
0 active smoke or fire alerts · read from the National Weather Service at Aug 26, 1:54 AM EDT · refreshed every 10 minutes
No active smoke or fire alerts
The National Weather Service has no active fire weather, dense smoke, air quality, blowing dust or volcanic ashfall alerts covering Iowa as of this refresh.
An empty list here is the ordinary reading, not a fault and not a gap in the data. Most of the country carries nothing in this family on most days, and this lane fills itself the moment the Weather Service issues something.
The 12 alert types this lane reports
Every one is a National Weather Service product and is listed under the name the Weather Service gives it. Grouping them into families is ours; the names are not.
- Fire weather
- Fire WarningExtreme Fire DangerRed Flag WarningFire Weather Watch
- Dense smoke
- Dense Smoke Advisory
- Air quality
- Air Quality Alert
- Blowing dust
- Blowing Dust WarningDust Storm WarningBlowing Dust AdvisoryDust Advisory
- Volcanic ashfall
- Ashfall WarningAshfall Advisory
The Weather Service defines each of these products and this site does not attempt to. What any one of them means, and the criteria an office issues it under, are at weather.gov.
This lane is informational and is not a safety resource. It reports which National Weather Service smoke and fire alerts are active and where, on a ten-minute refresh cycle, so it can lag the Weather Service.
During an active weather event, the authority is weather.gov and your local emergency management agency. Follow them, not this page.
Smoke exposure and air quality are health matters, and this page does not address them. It does not tell you whether it is safe to be outdoors or to work, what an air quality index number means for you or for anyone in your household, or what respiratory protection to use. Those questions belong with a clinician and with the agency that issued the alert. The federal air-quality authority is airnow.gov.
What smoke does to a roof assembly
An active alert is a record of conditions, not a finding about any building. These are the standing references on the building-assembly side of a smoke or fire loss.
Severe weather season in Iowa
Peak season
April–August
Iowa takes both discrete hail-producing supercells and the long-lived straight-line windstorms known as derechos, which have crossed the state and produced roof damage over a very wide area in a single pass. The severe season runs from spring through summer. Winter is a separate concern entirely, with heavy snow, drifting and blizzard conditions loading roofs rather than striking them.
Seasons describe a pattern, not a schedule. The National Weather Service issues these products year-round, and the live list above is the only authority on what is actually running in Iowa right now.
What NOAA has recorded in Iowa
The archived record, not the live feed. Severe weather logged by the National Centers for Environmental Information over the covered years, split into the events NOAA keys to a county and the events it keys to a forecast zone.
Between 2016 and 2026, NOAA recorded 9,128 county-level severe-weather events across Iowa: 4,705 thunderstorm wind events, 3,625 hail reports and 798 tornadoes. Of the 3,625 hail reports carrying a measured size, 2,857 were 1.00 in across or larger.
A further 2,905 events over the same period were recorded against National Weather Service forecast zones rather than counties — 1,239 winter storms, 597 blizzards, 579 high wind events, 229 heavy snow events and 134 ice storms. A forecast zone is not a county: it can span several or subdivide one, so these are reported here at state level and appear in no county total on this site.
County-keyed events
9,128
2016–2026
Zone-keyed events
2,905
statewide, not county-attributable
Hail 1.00 in or larger
2,857
of 3,625 sized hail reports
Tornadoes
798
in the county record
Counties with the heaviest record
Ranked by the number of county-keyed events NOAA recorded, 2016–2026. 99 of Iowa’s counties carry a record in this dataset.
- Polk County380largest hail 3.25 in (Softball+) · peak gust 74 kt (about 85 mph)
- Linn County323largest hail 2.75 in (Softball+) · peak gust 122 kt (about 140 mph)
- Scott County314largest hail 4.00 in (Softball+) · peak gust 93 kt (about 107 mph)
- Story County214largest hail 2.50 in (Baseball) · peak gust 87 kt (about 100 mph)
- Johnson County198largest hail 2.75 in (Softball+) · peak gust 72 kt (about 83 mph)
- Dubuque County177largest hail 2.00 in (Baseball) · peak gust 87 kt (about 100 mph)
- Woodbury County174largest hail 2.00 in (Baseball) · peak gust 83 kt (about 96 mph)
- Warren County163largest hail 3.00 in (Softball+) · peak gust 76 kt (about 87 mph)
Preliminary — not yet in the permanent archive
578 further preliminary storm reports have been filed against Iowa counties since June 1, 2026. They are counted separately from every archived figure above and are not added to any of them.
Preliminary reports covering 2026-05-31 onward come from National Weather Service storm reports filed as events occur. They have not yet been through the quality-control review that produces the permanent archive, and individual reports may later be revised, combined or withdrawn.
County figures and state figures. County figures count events NOAA recorded against a county (hail, thunderstorm wind and tornadoes). High wind, winter storms, ice storms, blizzards, heavy snow, hurricanes and tropical storms are recorded against National Weather Service forecast zones rather than counties, so they are reported at state level instead. Counts reflect events that were observed and reported.
Source. Archived figures come from the NOAA National Centers for Environmental Information Storm Events Database, covering 2016 through May 31, 2026. Reports after that date come from NOAA Storm Prediction Center preliminary storm reports. Both are US Government works in the public domain. This is a record of past weather; the live alert list at the top of this page is the only authority on what is running in Iowa now.
What these storms do to a roof
The damage mechanisms that matter in Iowa, in the order they generate work here.
Hail
Hail damages an asphalt shingle in two ways at once. The impact knocks granules off the surface, and it can bruise or fracture the asphalt mat underneath without breaking the surface open. Granules are what shield the asphalt from ultraviolet light, so a roof that has lost them ages faster from that point on. A fractured mat is the reason hail damage is often described as latent: the roof may not leak the week of the storm, and the failure shows up later. On metal panels and metal accessories, hail leaves dents, which raises the separate question of whether the damage is cosmetic or has actually compromised the panel or its coating.
Straight-line wind
Wind damage on a shingle roof usually starts as a broken seal rather than a missing shingle. Uplift pressure is highest at the edges — rakes, eaves, ridges and hips — and along any line where the roof plane changes, so that is where tabs lift and the factory sealant strip lets go first. Once the seal is broken, a shingle that still looks fine from the ground is no longer bonded to the course below it and every later wind event works on the same spot. Wind also drives debris, and impact damage from a branch or from another roof’s material is a separate mechanism from uplift.
Tornado
Tornado damage is structural rather than incremental. Rather than degrading a covering, the event tends to remove decking, displace framing and fail the connections between the roof and the walls, which is a rebuild question rather than a re-cover question. The damage is also very sharply bounded: the path can take one street and leave the next one untouched, which is why the county list on a warning is a starting point and not a damage map.
Snow load and winter storms
Winter loads a roof rather than striking it. Accumulated snow is a sustained weight on the structure, and drifting means the load is rarely spread evenly — it piles against ridges, dormers, valleys and the low side of any change in roof height. Melt-and-refreeze adds the second mechanism: heat escaping through the roof melts snow that then refreezes at the cold eave, and the resulting ice can back water up under the covering, which sheds water flowing downhill but not water standing still.
Why the storm date matters
Property insurance works from a date of loss — a specific storm on a specific day over a specific area, not a general observation that a roof looks worn. That is why the county list and the effective and expiry times on each alert above are the useful part of this page: they are the National Weather Service’s own record that a given event covered a given county at a given time.
It also matters because hail damage is frequently latent. A fractured shingle mat can take a long time to become a leak, so the gap between the storm and the discovery can be considerable — and by then, establishing which storm did it is a records question rather than an observation. An alert naming a county is not evidence that any particular building was damaged; it is evidence of what the weather was doing over that county, which is where an assessment starts rather than where it ends.
Next steps in Iowa
Source: the National Weather Service. Every alert on this page comes from the NWS public alerts feed at api.weather.gov, a free US Government service, and is reproduced as the issuing office wrote it. The office that issued each alert is named on the alert itself.
This site does not edit, summarise or re-grade Weather Service text. Alerts are filtered into two separate lists — the event types that affect roofs, and the smoke, fire and airborne-particulate family — and each list is sorted. Nothing else is changed, and no alert is moved between the two lists to suit a heading.