National Weather Service DIRECT
U.S. current conditions, point forecasts, hourly and seven-day forecasts, active alerts, zones, radar stations, forecast grids, and radar maintenance messages.
Transparency
Weather data
and its sources.
A current inventory of the upstream feeds, first-party delivery services, and mapping dependencies used by Mammatus Weather.
September 2026 inventory
How data reaches the app
Agency names identify the owner or issuer of source data. Mammatus processing or redistribution does not imply agency endorsement or affiliation. Coverage and availability may change upstream.
DIRECT
The app requests the issuing agency or public distribution endpoint directly.
MAMMATUS
Mammatus processes, catalogs, or delivers the product while preserving upstream attribution.
UPSTREAM
The agency supplies observations to a Mammatus service consumed by the app.
Forecasts & hazards
Forecasts, alerts, and outlooks
NOAA Storm Prediction Center DIRECT
Convective outlook polygons and probabilities, fire-weather outlooks, and active Mesoscale Discussions.
NOAA Weather Prediction Center DIRECT
Day 1–5 Excessive Rainfall Outlooks, Day 1–7 winter precipitation guidance, and active Mesoscale Precipitation Discussions.
NOAA Climate Prediction Center DIRECT
6–10 day, 8–14 day, monthly, and seasonal temperature and precipitation outlooks.
U.S. Drought Monitor DIRECT
Latest weekly U.S. drought intensity polygons, jointly produced by NDMC, USDA, and NOAA.
Observations
Radar and surface observations
NOAA/NWS RPCCDS DIRECT
Latest U.S. NEXRAD Level III reflectivity, velocity, dual-pol, precipitation, VIL, and echo-top products.
NOAA Multi-Radar/Multi-Sensor System DIRECT
CONUS Composite Reflectivity QC, 24-hour Radar-Only QPE, and Multi-Sensor QPE Pass 1 and Pass 2.
NOAA Map Services DIRECT
Viewport-rendered national base reflectivity used for high-resolution MRMS presentation and captures.
Deutscher Wetterdienst DIRECT
German site radar, including numerical DX reflectivity and ODIM velocity sweeps decoded by the app.
Finnish Meteorological Institute DIRECT
Finnish local PPI reflectivity and velocity GeoTIFF products decoded and rendered by the app.
Mammatus Radar Volume service MAMMATUS
Processed 3D volume artifacts derived from NOAA NEXRAD Level II scans for supported radar sites.
Radar volume service
Mammatus on-device analysis DERIVED
Storm-track positions, motion, and extrapolation derived locally from selected single-site radar frames. No additional network source is used.
Imagery
Satellite imagery and lightning
Mammatus Satellite Tile Service MAMMATUS
Dynamic catalogs, legends, completed-frame manifests, and immutable WebP tiles for GOES East, GOES West, and Himawari products.
NOAA/NESDIS UPSTREAM
Source GOES imagery used by East and West products and attributed in the app as NOAA/NESDIS.
Japan Meteorological Agency via JAXA P-Tree UPSTREAM
Source Himawari imagery distributed through JAXA P-Tree and delivered as Mammatus tiles.
Mammatus GLM service MAMMATUS
Normalized historical and streaming lightning flashes for the radar map.
GLM feed · GLM health
NOAA GOES-19 and GOES-18 UPSTREAM
GOES-East and GOES-West GLM-L2-LCFA source objects used by the Mammatus lightning service.
Numerical guidance
Forecast models
NOAA HRRR DIRECT
Hourly and sub-hourly CONUS GRIB2 fields used by the primary Models page.
NOAA RRFS DIRECT
3 km hourly and sub-hourly CONUS GRIB2 fields used by the primary Models page.
NOAA GFS DIRECT
0.25-degree global GRIB2 fields used by the primary Models page.
NOAA HAFS DIRECT
HAFS-A and HAFS-B Storm and Parent domain products, using NOAA PDS and NOMADS discovery paths.
Mammatus public model service MAMMATUS
Rendered WebP maps and catalogs for the integrated model browser, including HRRR, GFS, HAFS, and first-party WRF domains.
Public model catalog
Mammatus map-region catalog MAMMATUS
Temporary region assignments used for first-party WRF mesoscale domains.
Map-region catalog
Tropical weather
Tropical guidance and reconnaissance
NOAA National Hurricane Center DIRECT
Active storms, official tracks and cones, current-storm metadata, Graphical Tropical Weather Outlook areas, and reconnaissance text products.
NOAA/NHC ATCF DIRECT
Best-track data and public model-aid guidance used for observed tracks and model overlays.
NOAA and U.S. Air Force reconnaissance DIRECT
NHC-hosted aircraft reconnaissance products for Atlantic and Pacific missions.
Iowa Environmental Mesonet DIRECT
AFOS product listings used to discover recent reconnaissance bulletins.
Worldwide coverage
International alerts
Environment and Climate Change Canada DIRECT
Official Canadian warnings, watches, advisories, and statements with GeoJSON polygons.
Deutscher Wetterdienst DIRECT
Official German CAP warning polygons and details.
Finnish Meteorological Institute DIRECT
Official Finnish CAP warnings.
KNMI through MeteoAlarm DIRECT
Official Netherlands warnings; warning-region geometry is bundled in the app for reliability.
Supporting services
Mapping, geography, and operations
Mapbox and MapLibre SUPPORT
Map rendering, base styles, and open-source interactive map paths used by radar, satellite, models, and native 3D views.
OpenFreeMap, OpenMapTiles, and OpenStreetMap SUPPORT
Vector tiles, fonts, cartographic layers, geography, and place data used by bundled light, dark, and hybrid styles.
Esri World Imagery SUPPORT
Satellite basemap imagery. Esri credits include Maxar, Earthstar Geographics, and the GIS User Community.
U.S. Census Bureau TIGERweb SUPPORT
State and county geometry used by supporting map and location workflows.
Mammatus Weather Status OPS
Public operational status for Mammatus-hosted services. Normal app requests continue to use each service endpoint directly.
This is a provenance inventory, not a Free-versus-Pro entitlement list. Data availability and update times depend on each provider. Mammatus Weather is not a substitute for official warnings or instructions from local authorities.