Weather Glossary

Flash Flood Warning

Plain English first, then the technical definition. From the LightningWX Weather Course.

What Is Flash Flood Warning?

An NWS alert meaning flash flooding is happening or about to happen in your area. Move to higher ground immediately. In technical terms: A short-fuse NWS warning product, issued as storm-based polygons, for flash flooding that is imminent or occurring; includes impact-based tags (Considerable, Catastrophic) and source and rainfall-rate details.

Also called: FFW

Flash Flood Warning In Plain English

An NWS alert meaning flash flooding is happening or about to happen in your area. Move to higher ground immediately.

The Technical Definition

A short-fuse NWS warning product, issued as storm-based polygons, for flash flooding that is imminent or occurring; includes impact-based tags (Considerable, Catastrophic) and source and rainfall-rate details.

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