Click any site marker on the map to load it, or open its NWS office.
Panels
Product 1–7
Elevation tilt ↑ ↓
Scan time
← → step through the day's volume scans.
The archive publishes a volume only once the radar has
finished it, so it runs 5–10 minutes behind. This follows the same scan as it is written,
tilt by tilt.
Radar loop
Previous frames12 frames
≈1 h of data
4 fps
Frames are rendered once and cached, so playback is smooth.
Panning or zooming invalidates them — rebuild after you settle.
Swaths & tracks No swath built yet.
Scans to accumulate18 scans
≈1.4 h of storm history
Running maximum of estimated hail size and low-level rotation across every
scan in the window — where the core and the couplet have been, not just where they
are. Hail size depends on the melting level: load a sounding first and it uses that instead
of a seasonal default.
Futurecast HRRR
Forecast houranalysis
Opacity
HRRR simulated reflectivity, hourly to +18 h. This is a model
forecast, not observation — treat it as guidance on storm mode and timing.
Drawing & measuring
Polygons finish on double-click. Esc cancels.
Storm speed30 kt
Corridor spread±12°
Drag from the storm to where it is headed — towns in the
corridor get arrival times on the map.
Place files
Load from disk
CORS proxy
Must contain {url}. Needed for the archive, METARs, place files and road data.
Tornado Warning
3D volume
Drag to rotate, wheel to zoom. Cells are
interpolated between beams and left empty where nothing was sampled, so the holes are real
gaps in the scan rather than gaps in the storm.
Cross-section
Warning
—
—
render —
Cursor
Move over the radar.
Reflectivity (dBZ)
Watches —
Loading watches…
Warnings —
Loading warnings…
Loading…
Local alerts
Notify within100 mi
Sound tone within20 mi
Tone volume
No position set.
Distance is measured to the nearest edge of the warning, not its centre.
Tones are deliberately not the EAS attention signal — that one is restricted by FCC rule
and would be a problem on a stream.
Alerting only runs while this tab is open and awake. There are no push notifications. If you close this tab, lock the phone, switch apps, or the browser suspends the page, nothing is being monitored and no alarm will sound. Do not rely on this to wake you.
On-air alerting
Warnings outside that stay in the list — they just don't interrupt.
Read speed1.00x
Layers
Display
Radar opacity
Basemap
Basemap brightness
Roads & labels
Road layer opacity
Town names sit above roads when zoomed out and below them past z11, so you
can identify areas at a glance and navigate up close. Roads sit above the radar by default.
Right-click the map for nearest radar, soundings and measuring.
Right-click the map for a model sounding.