Radar, satellite, models and soundings on one map.

Level II and Level III from the whole NEXRAD network, with the tilts each radar is really flying.

• Super-resolution Level II and Level III from every NEXRAD radar, including the sites in Puerto Rico, Alaska, Hawaii, Guam and South Korea.
• Each radar's real tilts, checked when you pick it and every five minutes after: cuts below 0.5° and upper tilts up to 19.5° where the radar flies them. A product the radar does not publish is greyed out.
• Reflectivity, velocity, storm-relative velocity, normalized rotation, the dual-pol products, echo tops, VIL, and one-hour and storm-total precipitation.
• Loops of every scan, and archive playback from any moment since March 2022, Level III and Level II alike; Level III also loads a whole day at once.
• Press and hold on the map, or right-click and choose Radar here, to switch to the nearest radar.
• VAD wind profiles as a full-screen time-height display with barbs, and their hodograph.
• The value under the pointer, smoothing that follows the echo's outline, and units per product: kt, mph, m/s or km/h for velocity, kft or km for tops, inches or mm for rain.
• Your own GRLevelX .pal colour tables, imported in Settings.

The radar's storm cells with their forecasts, and a rotation product that reads the same near the radar and far from it.

• Each cell's track so far and its forecast positions at 15, 30, 45 and 60 minutes, with time ticks across the path.
• Tornado vortex signatures marked with an inverted triangle; mesocyclones named in the cell's report.
• A report for each cell: motion, range, hail probability and maximum size, top and base, maximum reflectivity and its height, VIL, and the trend of each across recent scans.
• The towns in its path with their distance and arrival time, and the warnings over it.
• Normalized rotation (NROT): the shear across 5 radials by 5 gates, divided by the shear that counts as significant at that range. 1 is significant, 2.5 extreme; positive is cyclonic.
• NROT is made from the super-resolution velocity the NWS has already dealiased, so velocity folds do not read as rotation. At 0.5°, 0.9° and 1.3°, with loops and archive playback.
• Checked on Rolling Fork (KDGX, 25 March 2023): the scan's strongest NROT, 4.3, sits 2 km from the tornado's reported position.

Split the screen into two, four or six panes on one camera and one timeline, each with its own product.

• Correlation coefficient, differential reflectivity, specific differential phase and hydrometeor classification, at every tilt the radar flies.
• Spectrum width, differential phase and clutter filter power from Level II.
• The hydrometeor classification legend names each class, from biological and wet snow to graupel and small, large and giant hail.
• Pan, zoom or play one pane and the others follow. Two panes sit side by side, four tile 2×2 and six 3×2.
• NWS alerts on every pane, and drawings too.

A vertical slice through every tilt of the radar's volume, along any line you draw.

• Cross section, at the foot of the radar product panel: click two points on the map, then drag either end and the slice follows.
• Reflectivity, velocity, storm-relative velocity, correlation coefficient, differential reflectivity, spectrum width or differential phase.
• Opens full screen, with the centre line of each beam drawn over the slice and heights in kft or km.
• The pointer reads the value and its height, and a dot on the map marks the same spot.
• Sampled with the standard 4/3-earth beam geometry. The volume is read once, so moving the line after that is almost instant.
• The timeline steps it through the scans, like the map.

Every flash the GOES-East and GOES-West lightning mappers see, over the Americas and the oceans either side.

• In-cloud and cloud-to-ground flashes alike, seen from orbit by the Geostationary Lightning Mappers.
• Coloured by age: white for the last minute, then yellow, orange and red, to magenta for the oldest.
• A window of 5, 10, 15, 30 or 60 minutes, from GOES-East, GOES-West or both: East east of 106°W, West the rest.
• The panel counts the flashes in the window and in the last minute, and gives the newest one's time.
• Live, from the files each satellite writes every 20 seconds; only flashes NOAA rates as good quality are drawn.
• It follows the timeline: playing the radar shows the lightning of each scan's minutes, read ahead of the loop.

Ten satellites, every region each one covers, sharp at every zoom.

• GOES-East and GOES-West, NOAA-20 and NOAA-21, Himawari-9, Meteosat-12, Meteosat-9, Meteosat-11 (rapid scan), Metop-B and Metop-C.
• CONUS, the 1-minute mesoscale sectors, the full disks and the regions cut from them: South and Central America, the Pacific, Japan, Australia, Southeast Asia, Europe, Africa, India, the Middle East and more, each with its own product list.
• All 16 GOES bands, 28 RGB composites and 28 Level 2 products, from cloud top height and fire detection to CAPE and precipitable water, each with its colour legend.
• A quick picture first, then the sharp one in its place. Loops play as soon as each frame's quick picture is in, and sharpen while they play.
• Loops of 6 to 288 frames on the timeline, like radar and models, with their own playback speed.
• GOES straight from NOAA's data on Google Cloud, with AWS as the fallback; Himawari from AWS; CIRA's SLIDER, EUMETSAT and NASA GIBS.

Forecast models, analyses and the MRMS mosaic, all in one Models panel.

• Convection-allowing: the HRRR and RRFS, each also sub-hourly, the NAM Nest, the HRW ARW and FV3 runs, and the HREF and REFS ensembles.
• Regional and global: the RAP, NAM, NDFD, GFS, AI GFS, ECMWF, ECMWF AIFS, ICON and GEM.
• Ensembles: the GEFS, AI GEFS, HGEFS, ECMWF ENS, AIFS ENS and the NBM.
• Over 300 products: temperature and wind, CAPE and shear, updraft helicity and hail, simulated reflectivity and infrared, precipitation type, rain and snow totals.
• A run picker that opens on the newest long run, a strip of the runs that forecast the moment on screen, and one even pace through the whole run when it plays.
• Compare models: a grid of up to nine maps, each with its own model and product.
• The hurricane models HAFS-A, HAFS-B, HWRF and HMON, and every model's track from the NHC's ATCF decks.
• MRMS: the 2-minute radar mosaic products, rainfall (QPE) and flash flooding.
• Analyses up to a week back: the HRRR, RAP and RTMA every hour, the RTMA Rapid Update every 15 minutes, and the GFS, NAM and NAM Nest every six hours.

SPC's severe-weather parameters for any hour since January 2005, worked out the same way for every year.

• NOAA's own analyses: the RAP's every hour, and the RUC's before May 2012, read from NOAA's archives on AWS and at NCEI.
• Surface-based, mixed-layer and most-unstable CAPE and CIN, LCL, LFC and EL, Bunkers storm motion, 0–1 and 0–3 km helicity, and 0–1 and 0–6 km shear.
• The effective inflow layer with its helicity and bulk shear, and SPC's effective-layer STP (with CIN) and SCP.
• 94 products in the surface, upper-air and severe groups, with contours, wind barbs, places and values, the value under the pointer, loops and the compare views.
• Checked against the RAP's own fields where it has them: MLCAPE and MUCAPE agree at 0.99, helicity and shear at 0.97.
• 29 notable days one click away, from Greensburg in 2007 to 2025: the April 27, 2011 Super Outbreak, Joplin, Moore, El Reno, the 2012 and 2020 derechos, Rolling Fork, Greenfield and more.
• A day plays as its convective day, 12Z to 11Z. On the notable days since March 2022, one button opens the radar that saw the storm at the same moment.
• An hour takes a few seconds the first time and opens at once after that; up to 4 GB of hours stay on disk.

Every tropical cyclone on Earth, with its forecasts, models, satellite and history, in a ten-tab dashboard and on the map.

• NHC and CPHC cones, forecast tracks and coastal watches and warnings, JTWC forecast tracks, the track so far by category and the wind radii.
• Click a storm for its card: Show on Satellite puts the best picture of it right now on the map, a 1-minute GOES or Himawari sector when one is on it; Show Spaghetti Models draws the models.
• A storm page for each one: intensity, pressure and the 24-hour change against the models, the guidance, NHC's graphics and every advisory.
• Wind speed probabilities, formation areas with their chances, and Hurricane Hunter flights live and back to 1989.
• Any storm since 1842 in any basin, searchable by name; seasons ranked by ACE against the 1991-2020 normal, and the record books.
• Sea surface temperature on any day since June 2002, ENSO back to 1870 and the MJO with its phase diagram.

SPC, WPC, CPC and NHC outlooks in one panel, in their official colours.

• SPC Days 1 to 8: categorical, tornado, wind, hail and significant severe, with conditional intensity drawn as a hatch over the probability.
• SPC fire weather, and WPC excessive rainfall and winter storm severity.
• CPC 6–10 and 8–14 day, monthly and seasonal outlooks, drought and hazards, and NHC tropical formation.
• Past issuances by date and time, the one before drawn as an outline, the forecast discussion, and the risk at any point you click.
• NadoCast tornado, wind and hail probabilities.

Airports, synoptic stations and mesonets as station plots, with a page for each station.

• Every METAR airport in the Aviation Weather Center's file, WMO SYNOP stations worldwide, and the US mesonets and personal stations from MADIS.
• Brazil's INMET automatic stations, with your own INMET token.
• Plots follow the timeline: at a past frame each station shows the report it had made by then, back about 15 days for airports and 5 for mesonets.
• The last hour's rain and the present weather on each plot, where a station plot puts them.
• A station page with current conditions, meteograms, charts of temperature, wind, pressure, humidity, visibility and rain, and the raw reports.
• Stations that are not airports show rain, cloud and maximum and minimum temperature instead of flight categories.

River gauges in the US and Brazil, each with a full hydrograph.

• Every NWS river gauge, coloured by the flood category its stage is in now, with a ring on the ones forecast to reach a worse one.
• In Brazil, the Geological Survey's flood alert stations (SGB) with their attention, alert and flood levels, and ANA's telemetry stations with level, flow and rain.
• A full-screen hydrograph for each gauge: stage against the flood levels and the NWS forecast, flow against the normal for the date, and the rain measured and forecast for the next 7 days.
• The gauges up and down the river a click away, the highest crests, what floods at which stage, and the chance of flooding over the next three months.
• A search over every gauge by river, town or code, and a list of everything in flood or forecast to be, worst first.
• NWS flood warnings, watches and advisories by kind, and the National Water Model's high flows, rapid onset flooding and inundation on the map.

SHARPpy soundings from radiosondes, model forecasts and aircraft.

• Observed radiosondes, ACARS aircraft profiles, and a model forecast sounding for any point: right-click the map and choose Sounding.
• Area sounding: the model profile averaged over a box you drag, instead of one grid cell.
• The full SPC sounding display: skew-T, hodograph, indices, storm motion, SARS analogues and STP. Its hodograph and Bunkers motions match the SPC's.
• Analyze, Risk, Compare and Trends views, the radar's VAD wind profile, and your own soundings by upload.

NWS warnings, watches and advisories on every pane, with an alert rail.

• Full VTEC decoding: the hazard, what to expect, the impacts and when each alert expires.
• Alerts follow the timeline: play a loop and the map shows the ones in force at each frame.
• A colour for each of 27 NWS products, fill strength, outline width and a dark edge under every outline, all in Settings.
• Local storm reports, SPC mesoscale discussions and WPC precipitation discussions.

From the Sun to the aurora, from NOAA's Space Weather Prediction Center and NASA, in an eleven-tab dashboard.

• NOAA's R, S and G scales and the key numbers on top of every tab.
• Solar wind, X-rays and flares, protons and electrons, Kp and Dst, the field at geostationary orbit, CMEs and the WSA-Enlil model, and the solar cycle.
• SDO and SUVI images and loops of the Sun, with its active regions.
• Charts you can zoom and pan, and that move the image loops to the time under the pointer.
• The aurora forecast, radio absorption, ionospheric TEC and the geoelectric field on the map.

One map and one timeline, and the tools around them.

• Split screen into 1, 2, 4 or 6 panes on one camera and one timeline.
• Export the view as PNG, or a loop of radar, satellite or models as GIF or MP4, with the WeatherTS name on every frame.
• Draw on the map with a pen, lines, arrows, circles, rectangles and text, in any colour; drawings stay pinned to the ground, show on every pane and go into exports.
• Eleven basemaps across vector, chart, imagery and terrain, and a globe projection.
• Distance, area and radius measurements, and a place search.
• Playback from 1x to 80x, with the time each product's frame stays on screen set in Settings.
• One searchable Settings for every part of the app, and light, dark and automatic themes.
• The workspace comes back as you left it: layers, the map, the radar and its options, and the dashboards that were open.
• No account needed. Sign in to share your position with other chasers, see theirs and pin your home.
• Updates install themselves on the next launch.