Explore history
Scan up to two years of reported storm activity and use Timeline to inspect the event sequence.
THOR FOR SEVERE-WEATHER ENTHUSIASTS & LOCAL RESEARCHERS
Explore how a storm unfolded, from report to replay.
Explore storm history with historical scans, Timeline replay, radar, tracks, outbreaks, hail swaths, and saved reports.
$34/month after the trial · No card required for the trial · All 50 states in one base plan
4-minute full app walkthrough
THOR Storm Mapper — Complete App Walkthrough
A broad tour of the live map, storm research, and practical field tools.
See the whole event
Compare reported points with radar replay, tracks, outbreaks, corridors, and hail-signature swaths.
Save your work
Keep Historical Hail Searches and reports in your saved library for later review.
HOW IT FITS THE WORK
A historical severe-weather workflow
Turn a storm date into a repeatable research path: select the period, compare the layers, and save the question you are working.
Your next move: Choose the storm period. Compare the layers. Save the search. Export the results.
Short field-view demo
Live Storm Tracking
Watch reported activity and live storm context come together on the map.
- 01
Browse a public state or city hail page to see recent storm activity.
- 02
Open the interactive map and select a historical scan window for a place or storm period.
- 03
Filter event types and thresholds, then compare radar, tracks, outbreaks, and hail swaths.
- 04
Save a Hail History or storm report and export event data for later study.
BUILT FOR STORM HISTORY
Study the event beyond the report dots.
Every THOR tool opens another way to study the storm, compare the layers, and keep the result.
- NOAA/SPC hail, wind, and tornado maps with date, severity, ZIP code, county, and place filters for narrowing the storm period you want to study.
- Tracks, outbreaks, corridors, Heat Grid, Impact View, and Satellite View layers for comparing the event beyond the individual report dots.
- Live and Past NEXRAD radar for checking the radar frames behind the historical event.
- Timeline replay with NOW, Cumulative, and hail-swath views for rebuilding the storm sequence on the map.
- Market Priority household, density, population, and Residential Score lenses for studying population and residential context beside the weather.
- Historical map slices and storm scans across the two-year interactive archive for revisiting the storm date that interests you.
- Property Storm History reports for pulling an address-centered weather record when a location deserves a closer look.
- My Reports for saved Property Storm History, Hail History, and Storm Reports, with sharing, browser print, and PDF export.
- Map-created and imported leads with pins, statuses, notes, calls, driving directions, follow-up dates, and individual lead CSV export.
- Lead Storm Monitor with 1–5 mile local coverage, a 25-mile Area Monitor, hourly checks, and recorded Storm Hits.
- Business Teams with separate member logins, owner controls, invitations, seats, shared lead context, and team hit visibility.
- 48H Alerts with your location, radius, event type, and severity settings for following the next severe-weather window.
- AI Mode for typed map requests, optional microphone input, fast searches, layer controls, GPS, filters, and map actions.
- Filtered state-level storm-event CSV and KML exports plus owner-managed organization lead import and export.
- One browser app for iOS, Android, tablets, and desktop PCs, so the storm archive is open on the device you have nearby.
6-minute guided Market Priority walkthrough
THOR Storm Mapper — Market Priority Walkthrough
See how Market Priority adds household and market context to storm research.
RECONSTRUCT THE EVENT
Follow the storm sequence across time.
Use Timeline to compare reports, radar, tracks, outbreaks, and hail swaths across the storm period you want to study.
Timeline demonstration
Timeline Replay + Hail Swaths
Replay a storm as radar, reports, and hail swaths build across the map.
Export workflow demonstration
Move Storm Data and Team Leads
See how to export filtered storm data and work with team lead lists.
FOR THE NEXT DEEP DIVE
Keep the storm archive ready for the next question.
Save the search, return to the map, and export the storm data when you want to keep digging.
FREQUENT QUESTIONS
Questions from Weather researchers
How much historical weather can THOR show?
The interactive map supports up to two years of NOAA/SPC storm-report scans. Property Storm History reports can reach further into nearby archives.
Can I save a historical hail search?
Yes. Save Historical Hail Searches and storm reports in the library so you can return to the work later.
What is THOR built for?
THOR is a browser-based storm map for historical scans, replay, radar, reports, hail swaths, saved research, and exports.
THOR STORM MAPPER
Keep the storm archive ready for the next question.
Start a 14-day trial with no card required.