For US PDR technicians & hail repair teams
Track the hail.Plan your next move.
Know which hail areas deserve a closer look. Get location, estimated hail size and confidence by email and phone push — for the areas you choose.
For independent PDR technicians and hail repair businesses. Email & web push.
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Choose your working area.
Set the areas you want to monitor in the contiguous US.
Set your priorities.
Choose the estimated hail size and confidence level that matter to your work.
Review, then decide.
Receive matching alerts. Check location, evidence and estimated track before heading out.
The data behind the analysis
Data sources for our analyses
Radar, weather models and supporting evidence from traceable sources. HailSignal analyses these data – each alert identifies its sources.
Radar, lightning & models · USA
NWS ground reports · Iowa State University
Hail radar · Switzerland
Weather models & official warnings
Official warnings · Europe
Satellite lightning data · Europe
Official warnings · Canada
More data sources and their role
National weather services via MeteoAlarm
Warnings come from the respective national weather services. Their origin is retained with the evidence.
Radar sources under evaluation
These sources are used for observation and calibration. They do not currently generate customer alerts on their own.
Reference and geographic data
UCAR/ICECHIP provides ground references for separate comparisons. Maps, place names, time zones and warning boundaries use additional datasets; their attribution appears on the map and in the legal notice.
The providers supply source data. HailSignal produces the analyses and assessments.
Sources & usage informationCoverage
Your US working area. In view.
Radar coverage across the contiguous US. Local detection depends on radar coverage and available evidence. Check your working area before subscribing.
- Live
Contiguous United States
The lower 48 states, plus nearby parts of southern Canada and northern Mexico within radar range. Alaska and Hawaii are not included.
- Live
Switzerland & the Alps
Within the Swiss radar network’s range, including nearby areas up to 150 km from a radar.
- Evidence source
Official warnings from 14 countries
European hail warnings support alerts as independent evidence.
- In development
Over 20 countries under observation
We collect data and calibrate. Customer alerts start only after validation.
Swiss hail radar: 1 April to 30 September. Outside this season, this source provides no current hail estimates. The US radar feed is separate.
All countries in detailHere’s what you get
What matters. In one alert.
A practical view of a hail area: where, estimated size and evidence level. Use it to decide where to investigate next.
Tuesday, 1 September
HailSignalnowHail near Plano, TX
Estimated up to 61 mm (about 2.4 in). The storm is moving towards Allen and McKinney.
- Hail size
- ~61 mm
- Confidence
- C2
Where is the storm heading?
Location and direction at a glance.
Illustrative US example, schematic route — not an actual storm report. Size and track are estimates. C2 does not confirm vehicle damage or repair opportunities.
How alerts are createdUnderstanding an alert
Confidence, made clear.
Estimated hail size and confidence are assessed separately. So you can put each alert into context.
How large is the hail?
- Class 2
- 20–<30 mm
Dents possible.
- Class 3
- 30–<45 mm
Elevated damage potential.
- Class 4
- 45 mm and above
High damage potential.
How sure are we?
- C1
- Possible
An initial radar signal, not yet confirmed.
- C2
- Likely
Matching radar products or a second, independent piece of evidence.
- C3
- Very likely
With a verified observation from the ground.
- C4
- Confirmed
Four independent confirmations on site.
Large hail does not automatically mean high confidence. Downgrades are reported too.
How we check the evidenceExcl. applicable taxes · business use · annual renewal
See the annual plan & terms