NWS Deploys Improved TACLS to 122 Offices for Earlier Flash Flood Warnings
Updated
Updated · The Verge · Sep 18
NWS Deploys Improved TACLS to 122 Offices for Earlier Flash Flood Warnings
1 articles · Updated · The Verge · Sep 18
Summary
A new TACLS version with upgraded graphics is being loaded into the National Weather Service system and is set to reach all 122 forecast offices in the second half of October.
The software combines GNSS satellite moisture data with machine learning to flag where rain could rapidly turn into a flash flood, giving forecasters earlier evidence than rainfall tracking alone.
TACLS is already in use in the Los Angeles and San Diego offices, where officials say it can sharpen warning decisions and potentially speed alerts in fast-developing Western floods.
Current tools still miss some events or provide little lead time—especially in areas with sparse rain gauges—while flash floods can form in under 6 hours and become life-threatening within minutes.
The rollout comes as heavier rainfall linked to a warming climate raises flood risk, though TACLS is designed to support forecasters rather than replace human warning decisions.