Local Storm Reports (LSRs): What They Show & Don't

By StormAuditor Editorial Team · Published 2026-07-17 · Updated 2026-09-23

Based on public NOAA and National Weather Service records, published under StormAuditor's methodology and data-source standards. Radar-derived hail sizes are estimates unless attributed to a ground report.

Tornado descending from a dark storm base over open country on the Great Plains — Photo: NOAA NSSL (public domain)

Damage-threshold ranges in this article are general guidance synthesized from industry and federal research — IBHS building-performance research, NWS severe criteria, and product standards such as UL 2218 (hail impact resistance) and ASTM D3161/D7158 (shingle wind ratings). Actual performance depends on product rating, age, installation quality, exposure, and impact characteristics — thresholds describe when damage becomes possible, not when it occurs.

Local Storm Reports (LSRs) provide vital real-time accounts of severe weather directly from the field, but understanding their scope and limitations is key for accurate date-of-loss research.

Local Storm Reports (LSRs) for Date-of-Loss Research

Local Storm Reports (LSRs) are real-time severe weather reports. The National Weather Service (NWS) collects them during and right after storms. They give a ground-truth snapshot: hail size, wind gusts, tornado touchdowns, and the damage that came with them.

Property owners, adjusters, contractors, and attorneys all use them for date-of-loss research. To judge a past storm and its likely impact, you need to know what LSRs show and what they do not.

What Are Local Storm Reports and What Do They Contain?

LSRs are raw, unaudited reports of severe weather. Most cover hail, strong wind, and tornadoes. Trained storm spotters, police, emergency managers, and members of the public send them in. They give a human view of what happened.

An LSR usually includes:

Event type: Hail, wind, or tornado.
Location: City, county, and sometimes a street corner or GPS point.
Time: About when the event happened.
Magnitude: For hail, the estimated or measured size (such as 1.00" quarter-size hail). For wind, the estimated or measured gust (such as a 60 mph non-thunderstorm wind). For tornadoes, the estimated strength and path when known.
Comments: More detail on damage, the report source, or other context.

LSRs help the NWS issue warnings. After more review and quality control, they feed into the fuller NCEI Storm Events Database. StormAuditor processes LSRs in near real time. They feed our Hail Explorer and Wind Explorer tools.

How StormAuditor Uses LSRs

StormAuditor uses LSRs carefully and in context. Our SAHE-2 (Storm Auditor Hail Estimate v2) and SAWE-2, the Storm Auditor Wind Estimate methods treat LSRs as one of several sources.

Hail. SPC (Storm Prediction Center) storm reports build on LSRs. They are key for checking the radar's Maximum Estimated Size of Hail (MESH). We show ground reports next to the radar estimate, with their distance from the property. For example: a 1.75" golf-ball report a quarter mile away. The two lines of evidence appear together. They are never quietly merged.

Wind. LSRs with measured gusts (from an anemometer, for example) are key inputs to SAWE-2. LSRs with estimated gusts are treated differently. They show that strong wind was present. They do not set the wind speed the way station measurements or measured LSRs do. We also check LSR gusts against nearby NOAA ASOS/AWOS stations to build a consistent background wind field.

What Local Storm Reports Show

Ground truth: LSRs confirm that severe weather (such as hail of 1.00" or more, or gusts of 58 mph or more) actually happened in an area. They add human sightings alongside weather stations, or where there are none.
Rough extent: A cluster of LSRs gives a general idea of a storm's path and width. This helps most for hail swaths and damaging wind corridors.
Damage details: Some LSRs describe the damage seen. That gives clues about how strong the event was.
Timing: They give the approximate time of severe weather at specific places. That helps rebuild the event.

What Local Storm Reports Don't Show

Full coverage: LSRs depend on someone being there to see and report. Large areas hit by severe weather, mainly rural ones, may have no LSRs at all. No LSR does not mean no severe weather. A microburst with 70 mph damaging gusts can strike between stations and observers and leave no report.
Impact at your property: An LSR of 1.75" hail 3 miles away does not confirm 1.75" hail at your property. Hail swaths are often narrow and local. Wind gusts can change a lot over short distances. Whether your address was inside a warning area or a radar-derived hail swath is more precise.
Measured vs. estimated: Many wind LSRs are estimates, not anemometer readings. Estimated gusts show strong wind, but they are less precise for numbers.
Accuracy: People can misjudge hail size or wind speed. The NWS checks reports before they go into the NCEI database, but raw LSRs are real-time and unfiltered.
Exact timing: The time given is often approximate. An LSR alone rarely pinpoints the minute a gust hit a building.
Full damage picture: LSRs are first sightings, not complete damage surveys of an area.

Practical Guidance for Property Owners, Adjusters, and Researchers

Treat LSRs as one piece of a larger puzzle:

Check other data: Always compare LSRs with other trusted sources. For hail, look at radar-derived MESH swaths in tools like StormAuditor's Hail Explorer. For wind, check nearby NOAA ASOS/AWOS stations and NWS severe thunderstorm warnings. StormAuditor's [/address-lookup] gives this combined view.
Mind the distance: An LSR shows severe weather near that spot, not always at your address. Our system reports data "at location" first (the address sits inside the ~1-km radar cell), then nearby (1 mi, 3 mi, 10 mi, and so on), to make this clear.
Measured or estimated: Check whether a wind LSR is a measured or an estimated gust. Measured gusts are usually more reliable for numbers.
Look for warning areas: If there is an LSR for an area, an NWS Severe Thunderstorm Warning was very likely issued there. Being inside a warning area means severe weather was more likely. It does not confirm hail of 1.00" or more, or gusts of 58 mph or more, at every point inside it.
Use combined tools: StormAuditor combines LSRs with NWS warnings, radar data, and station data for a full weather history. Together they show more than any single data type. Start with our [/date-of-loss-weather-research] workflow.

StormAuditor gives weather data estimates, not measurements or legal opinions. We do not claim to prove what caused damage. We give the best available weather history so qualified professionals, such as engineers and inspectors, can make informed decisions.

Related StormAuditor Tools

Limitations

LSRs are valuable, but they have limits:

Coverage is uneven and depends on people seeing the storm. Not every severe event gets an LSR.
They can under-report in thinly populated areas, or over-report when someone misjudges size or speed.
Radar data can under-estimate wet hail and over-estimate in very strong reflectivity cores.
Station data can miss very local events like microbursts.

Combining all three gives a fuller picture. Still, no source or mix of sources is a perfect, 100% complete record of every weather impact at every point on the ground. These are estimates, not guarantees.

FAQ: Local Storm Reports

Q: What is the difference between a Local Storm Report (LSR) and a Severe Thunderstorm Warning?

A: The NWS issues a Severe Thunderstorm Warning when severe weather (hail of 1.00" or more, or gusts of 58 mph or more) is about to happen or is happening, based on radar or human reports. An LSR is a report of severe weather that someone observed. LSRs often lead to warnings, and warnings often lead people to send LSRs.

Q: Can I rely on an LSR alone to prove hail or wind at my property?

A: No. An LSR shows severe weather near the reported spot. Hail swaths and damaging wind corridors can be very local. For a property-level look, combine LSRs with radar hail swaths, NWS warning areas, and nearby weather stations, as a StormAuditor report does.

Q: Does every severe weather event get an LSR?

A: No. LSRs depend on people seeing the storm. Severe weather can hit empty areas or go unreported, so major events can be missing. No LSR does not mean no severe weather.

Q: How does StormAuditor use LSRs for hail size?

A: StormAuditor uses SPC storm reports (refined LSRs) to confirm and add context to the radar's Maximum Estimated Size of Hail (MESH). MESH covers the whole swath. A nearby ground report, such as 1.75" golf-ball hail, helps ground-truth the radar estimate.

Q: Are wind speeds in LSRs measured or estimated?

A: Both. Some wind LSRs give measured gusts from official or private weather stations. Others are estimated from damage or by eye. StormAuditor's SAWE-2 method puts measured reports first for consistency and accuracy. It uses estimated reports as signs of strong wind, not as exact values. Check the LSR details to see which it is.

Q: Where can I find historical Local Storm Reports?

A: In sources such as the Iowa Environmental Mesonet (IEM) archives (https://mesonet.agron.iastate.edu/lsr/) or the NCEI Storm Events Database (https://www.ncei.noaa.gov/access/storm-events-database/). StormAuditor brings these and other sources together to make research easier.