Warnings for Flash Floods and Debris Flows slides.pdf · Cranston Fire Scar USGS and USFS report....
Transcript of Warnings for Flash Floods and Debris Flows slides.pdf · Cranston Fire Scar USGS and USFS report....
Building a Weather-Ready Nation
National Weather Service
Warnings for Flash Floods and Debris Flows
Alex Tardy - Meteorologist
Weather.Gov
Building a Weather-Ready Nation
Warning Notification
Flash Flood Watch – potential for heavy rain exceeding thresholds today or tonight
Flash Flood Warning – heavy rain is occurring or imminent and flooding is expected along with possible debris flow for “defined area”
Threshold for rainfall (rate per hour) would be met and burn scar would be mentioned in Flash Flood Warning if affected
W th /S Di
FEMA alert app
Building a Weather-Ready Nation
Monitoring weatherfrom the Emergency Operations
Center and NWS
NWS San Diego
Building a Weather-Ready Nation
Rain showers on Weather RadarShowers came in late Wednesday evening
October 3 (Orange County)
Building a Weather-Ready Nation
Atmospheric River
Jet Stream
highest moisture in yellow and red
BIG storms
Building a Weather-Ready Nation
Rainfall is widespread but localized heavyWinter Storm
This type of “embedded rainfall” can cause high rain rates and debris flows