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Weather alerts

Active watches, warnings and advisories from the NWS (National Weather Service).

At your location

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Statewide

Sounding

The latest weather-balloon profile (radiosonde, launched at 00Z and 12Z, i.e. 7 AM / 7 PM EST) from the nearest upper-air site. Data: Iowa Environmental Mesonet.

Site

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Settings

Units & loop

Use metric units (km, m/s) Loop length: 6 frames Loop speed Radar opacity

Base map

Map layers

Color tables

Paste or upload a color table (.pal, the GRLevelX / RadarScope text format) for a product. Leave empty to use the built-in table.

Product

Near-Earth objects

These choices apply to the Asteroid tracker (Space → Astro) and the short close-approach list on Sky. GOES (Geostationary Operational Environmental Satellite) proton and X-ray chart ranges are on the Sun tab, on each chart (6 h, 1 d, 3 d, 7 d) — they are not repeated here.

About

WX Hubs Radar v5. Radar: NEXRAD Level II and Level 3 from the free NOAA/Unidata archive on AWS (Amazon Web Services), drawn at full native resolution in your browser. Bulletins: NWS and SPC (Storm Prediction Center) via api.weather.gov and the Iowa Environmental Mesonet (IEM). Personal use only, not for life-safety decisions.

Data sources & credits

Free, public data only. We do not sell access and we do not require a sign-in.

Environment and Climate Change Canada (ECCC) / Canadian Meteorological Centre (CMC): RDPS (Regional Deterministic Prediction System, also called GEM regional) via Open-Meteo.
NOAA: NWS (National Weather Service) NEXRAD and alerts; SWPC (Space Weather Prediction Center) aurora, Kp, solar wind, flares; NESDIS HMS (Hazard Mapping System) smoke and fires; NCEP (National Centers for Environmental Prediction) GFS, HRRR, HRRR-Smoke, and NBM (National Blend of Models), via NOAA and Open-Meteo.
DWD (Deutscher Wetterdienst): ICON global model, via Open-Meteo.
NASA: SDO, DONKI, APOD, JPL SSD APIs (CAD, Sentry, SBDB, Fireball; keyless). NASA NeoWs is not used (it needs an api.nasa.gov key).
NASA SVS (Scientific Visualization Studio): Moon Phase and Libration / Dial-a-Moon hourly frames (public domain, keyless) for the simulated “Your Moon right now” view. Frames include libration, a soft terminator, and earthshine; we rotate them so zenith is up at your location. This is not a live photograph.
ESA NEOCC (European Space Agency Near-Earth Object Coordination Centre): keyless close-approach and risk lists at neo.ssa.esa.int.
CelesTrak: satellite two-line element sets (TLEs) for the ISS.
COBS (Comet Observation Database) and MPC elements for comets.
Open-Meteo: forecast redistribution and geocoding (free, keyless). The Air Quality API redistributes Copernicus CAMS (Atmosphere Monitoring Service) and is keyless; the free tier is for non-commercial / personal use only.
EPA AirNow: keyless public file products (reportingarea.dat on files.airnowtech.org) for current and issued U.S. AQI (Air Quality Index) by reporting area. Preliminary, for AQI reporting, not official regulatory measurements (those are in EPA AQS). The keyed AirNow web API is not used.
EPA Envirofacts UV Index: keyless daily ultraviolet-index forecast by city/state or ZIP.
NASA GIBS (Global Imagery Browse Services): keyless WMTS (Web Map Tile Service) tiles, including VIIRS (Visible Infrared Imaging Radiometer Suite) aerosol optical depth (AOD).
NWS HeatRisk (experimental, WPC — Weather Prediction Center): keyless forecast imagery. Heat-index / shade WBGT (wet-bulb globe temperature) values shown in the app are estimates, not official NWS WBGT.
Libraries: astronomy-engine (MIT), satellite.js (MIT), Leaflet (BSD-2). Fonts and map tiles are credited on the maps themselves.
EUMETSAT imagery is not used in this app.

Display

Night vision mode (red)
Turns the whole app red and dim to protect your dark-adapted eyes.

Radar glossary

NEXRAD: Next Generation Weather Radar, the network of 159 NWS Doppler radars.
KMLB: The NEXRAD radar at Melbourne, Florida, closest to Deltona.
dBZ: Decibels of reflectivity. Roughly: 20 light rain, 40 moderate-heavy, 50+ very heavy, 60+ likely hail.
Velocity (kt): Wind speed toward (green) or away from (red) the radar, in knots (kt; 1 knot ≈ 1.15 mph, miles per hour). Tight red/green pairs can mean rotation.
VCP: Volume coverage pattern: the scan recipe (which tilts, how fast). 31/32/35 = Clear Air mode; 12, 112, 212, 215 and others = Precipitation mode.
SRV: Storm-relative velocity: velocity with the storms' own motion subtracted, which makes rotation easier to see.
ZDR: Differential reflectivity, in dB (decibels): how flat versus round the targets are. Big raindrops are flat (high ZDR); hail tumbles (near 0).
CC: Correlation coefficient: how alike the targets are. Rain/snow ≈ 0.97–1.0; hail, mixed precipitation or tornado debris lower (debris often < 0.8).
KDP: Specific differential phase, in °/km (degrees per kilometer): highlights heavy rain.
Tilt: The beam's elevation angle in degrees. 0.5° is the lowest scan, nearest the ground.
RF: Range folded (purple on velocity): echoes too far away for the radar to measure their speed.
Level 3: Processed single-radar products the NWS publishes for each station.
L1: Lagrange point 1, a spot between Earth and Sun where solar-wind satellites sit.
UTC: Coordinated Universal Time. This app shows your local time instead.