Weather Alerts API
for Global Severe Weather Notifications
Critical Data for Businesses
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.
| Alert Type | Description |
|---|---|
| Tornado Warning | Immediate tornado threat |
| Severe Thunderstorm Warning | Damaging winds, hail or lightning |
| Flash Flood Warning | Risk of dangerous and rapidly developing flood conditions |
| Winter Storm Warning | Snow, ice, blizzard conditions |
| Hurricane Warnings | Tropical cyclone impacts |
| 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 |
Weather Alert Response Includes
<warning message_id="011412KYC1777" description="Flood Warning" type="7" nws_office="NWS Paducah KY" source="9" severity="4" severity_level="Severe" issue_time_local="07/01/2026 09:12 CDT" issue_time_utc="07/01/2026 14:12 UTC" broadcast_time_local="07/01/2026 09:12 CDT" broadcast_time_utc="07/01/2026 14:12 UTC" valid_until_time_local="07/03/2026 13:00 CDT" valid_until_time_utc="07/03/2026 18:00 UTC" effective_time_local="07/01/2026 09:12 CDT" effective_time_utc="07/01/2026 14:12 UTC" parent_id="" name="Powderly" state_name="Kentucky" country_name="United States" latitude="37.22" longitude="-87.14">
<message>
The National Weather Service in Paducah KY has issued a Flood Warning for the following rivers in Kentucky. Green River at Paradise.
Recent heavy rainfall will result in minor river flooding at Paradise.
For the Green River...including Paradise...Minor flooding is forecast.
* WHAT. Minor flooding is forecast.
* WHERE. Green River at Paradise.
* WHEN. From late tonight to early Friday afternoon.
* IMPACTS. At 380.0 feet, Water rises over the skimmer wall at the TVA fossil plant.
* ADDITIONAL DETAILS.
- The river was at 379.7 FT this July 1st morning at 8:15 AM CDT.
- Forecast. The river is expected to rise above flood stage after midnight tonight to a crest of 380.2 feet early tomorrow afternoon.
- Flood stage is 380.0 feet.
</message>
<polygon>
37.46,-87.16 37.42,-87.03 37.26,-86.89 37.20,-86.97 37.29,-87.07 37.31,-87.19 37.46,-87.16
</polygon>
<county_id latitude="37.2157" longitude="-87.1421" name="Muhlenberg" country="US" country_name="United States" state="KY" state_name="Kentucky">KYC177</county_id>
<smpp_message>
Flood Warning; till: 07/03 13:00 CDT; The National Weather Service in Paducah KY has issued a Flood Warning for the following rivers in Kentucky. Green River at Paradise...
</smpp_message>
</warning>
Official warnings, watches, and advisories from National Weather Service, Environment Canada, and other meteorological authorities.
Extended alert coverage beyond government sources, providing comprehensive global severe weather notification coverage.
Proprietary advisories combining multiple data sources for enhanced global coverage of developing severe weather threats.
Flexible Data Access
All lightning datasets are available through our APIs for seamless integration into your systems.
Real-time lightning density · Lightning probability forecasts
Lightning probability forecasts (0–60 min) · Lightning density data (real-time)
Ideal for modeling, GIS, and advanced analytics workflows
Real Time Lightning Intelligence at 1 km Resolution
From government-issued alerts to custom global advisory systems, lightning detection, and specialized products — we build the alert solution for your use case.