Weather Alerts API
for Global Severe Weather Notifications

Global Severe Weather Monitoring

CustomWeather delivers real-time severe weather alerts for locations around the world. Developers, businesses, emergency managers, logistics providers, insurers, and travel applications use our API to receive official weather warnings, watches, advisories, and other hazardous weather notifications in JSON or XML.

Alerts are continuously monitored and updated as government meteorological agencies issue new information, allowing applications to notify users immediately when hazardous weather threatens a location.

Real-Time Weather Alerts: Critical Data for Businesses

  • Logistics & Fleet Management
  • Aviation
  • Insurance
  • Utilities
  • Agriculture
  • Construction
  • Smart Cities
  • Outdoor Recreation
  • Travel Apps
  • Energy
  • Public Safety
  • Emergency Management
Alert Type
Description
Hurricane Warning
Tropical cyclone impacts
Tornado Warning
Immediate tornado threat
Severe Thunderstorm Warning
Damaging winds, hail or lightning
Flash Flood Warning
Risk of dangerous and rapidly developing flood conditions
Heat Advisory
Dangerous heat
Wind Advisory
Strong or damaging winds
Coastal Flood Warning
Risk of flooding in coastal or low-lying areas
Fire Danger Warning
Elevated wildfire conditions
Dense Fog Advisory
Reduced visibility
Government-Issued Alerts (US and Canada)

Severe Weather Alerts (United States)

  • ● Real-time severe weather alerts for the entire US
  • ● Alerts are provided as soon as they are issued by the National Weather Service
  • ● No other weather provider offers real-time access to this information in so many unique technical formats.

Severe Weather Alerts (United States)

  • ● Real-time severe weather alerts for the entire US
  • ● Alerts are provided as soon as they are issued by the National Weather Service
  • ● No other weather provider offers real-time access to this information in so many unique technical formats.

Severe Weather Alerts (United States)

  • ● Real-time severe weather alerts for the entire US
  • ● Alerts are provided as soon as they are issued by the National Weather Service
  • ● No other weather provider offers real-time access to this information in so many unique technical formats.

Severe Weather Advisories

Global Severe Weather Advisory System
First and only worldwide severe weather advisory system.
  • ● Our advisories inform people around the globe of potentially dangerous or severe weather conditions in their local area BEFORE they happen.
  • ● Advisories are updated four times daily and are available for 85,000+ worldwide locations.
  • ● Advisories cover the next 24 hours.
  • ● Options for upcoming 6 hours, 48 hours, and upcoming 5 days are also available.
Examples Include:
  • Precipitation
  • Lightning Strike Alerts (US only)
  • High Winds
  • Freeze Alerts
  • Ice Accretion
  • Extreme Heat Alerts
  • Hail Potential
  • Tornado Potential
  • Surf Alerts
  • Tropical Storm Updates

Hail

Real Time Hail Tracking (USA)
  • ● Track the size and movement of storm cells containing hail based on Doppler Radar signatur
  • ● Provides the probability of hail associated with a storm cell
  • ● Indicates the maximum hail diameter reported
  • ● Available through our API in XML format
  • ● Data also available in a map tile interface with scroll-overs for additional detail

Sample Hail Forecast

  • ● Forecast for a probability of significant hail is available out to 7 days.
  • ● The criteria for significant hail has been defined by the Storm Prediction Center

Flood

Globally available flood risk is based on past, current, and future precipitation compared to typical during a given period.

Flood Risk
  • Precipitation observations and forecasts are dynamically integrated over time to capture flood potential as it relates to given conditions across the landscape.
  • Flood forecasts are available day-by-day at 10km with regional scales to 1km.
  • Flood risk is broken into 5 categories – Low, Moderate, High, Very High, and Severe.
  • Data can be delivered as kmz/kml, map tile, geojson, or geotiff/shapefile/geopackage

Icing Index

Icing index for any global location is available via CustomWeather’s Cloud Weather Service.

Icing Forecasts
  • ● Surface forecasts for categorical freezing rain
  • ● Categorical ice pellets
  • ● Percentage frozen precipitation
  • ● Frozen rain
  • ● freezing rain
  • ● highest tropospheric freezing level geopotential height
  • ● 0°C isotherm geopotential height

Lightning (North America)

Accuracy within 150 meters  |  Near 100% efficiency rating  |  Timing to the microsecond  |  Reporting within 12 seconds.

Flexible Data Access

All lightning datasets are available through our APIs for seamless integration into your systems:

Weather Essentials API

Cloud Weather Services API

Formats: JSON, XML

Formats: netCDF (gridded datasets)

Real-time lightning densityLightning probability forecasts

Ideal for modeling, GIS, and advanced analytics workflows

Real Time Hail Tracking (USA)
  • ● Track the size and movement of storm cells containing hail based on Doppler Radar signatur
  • ● Provides the probability of hail associated with a storm cell
  • ● Indicates the maximum hail diameter reported
  • ● Available through our API in XML format
  • ● Data also available in a map tile interface with scroll-overs for additional detail
Real Time Hail Tracking (USA)
  • ● Track the size and movement of storm cells containing hail based on Doppler Radar signatur
  • ● Provides the probability of hail associated with a storm cell
  • ● Indicates the maximum hail diameter reported
  • ● Available through our API in XML format
  • ● Data also available in a map tile interface with scroll-overs for additional detail
Real Time Hail Tracking (USA)
  • ● Track the size and movement of storm cells containing hail based on Doppler Radar signatur
  • ● Provides the probability of hail associated with a storm cell
  • ● Indicates the maximum hail diameter reported
  • ● Available through our API in XML format
  • ● Data also available in a map tile interface with scroll-overs for additional detail
Real Time Hail Tracking (USA)
  • ● Track the size and movement of storm cells containing hail based on Doppler Radar signatur
  • ● Provides the probability of hail associated with a storm cell
  • ● Indicates the maximum hail diameter reported
  • ● Available through our API in XML format
  • ● Data also available in a map tile interface with scroll-overs for additional detail

Built for High-Stakes Applications

  • Aviation & Airports
  • Energy & Utilities
  • Outdoor Events & Recreation
  • Insurance & Risk Management
  • Construction & Infrastructure
  • Government & Emergency Services

Why CustomWeather?

  • High-resolution (1 km) nationwide coverage
  • Minute-level updates for real-time awareness
  • Integrated observations + forecasts
  • Developer-friendly APIs
  • Proven reliability for mission-critical operations

Need a Custom Solution?

Multiple locations, Custom variables, or unique delivery windows – Our meteorology team will build the perfect report for your daily operation. if you want to learn more about our solution first before you request details, read about our APIs.

Click here