View All Articles

Criteria for a flood warning and flash flood warning

The National Weather Service (NWS) is the official U.S. government agency charged with issuing weather watches, warnings, and advisories and is the source used by iAlert.com. Below is the criteria for a flooding used by NWS forecasters when issuing flood warnings across the country…. FLOOD WARNING: A Flood Warning is issued when inundation of a normally dry area near a stream or other watercourse is expected, OR unusually severe ponding of water expected. Flooding of rivers or streams doesn’t always required rain to be overhead for your area to flood. Heavy rain upstream will make its way downstream causing flooding. FLASH FLOOD WARNING: A Flash Flood Warning will be issued after few hours of locally heavy rainfall, a dam or levee failure, or water released from an ice jam rapidly flooding nearby land. Although flash flooding typically occurs in hilly or mountainous areas flash flooding can happen anywhere Looking for the criteria for a tornado warning, criteria of a severe thunderstorm warning, or weather glossary?
This entry was posted in Weather Glossary and tagged , , , , , , , . Bookmark the permalink.

Leave a Reply

Read More

Southern Plains severe storms SPC Day 1 outlook for October 14, 2026, with a Slight Risk over Oklahoma and West Texas and Marginal Risk areas fromTulsa to the Mid-Atlantic

Southern Plains Severe Storms: SPC Slight Risk for Oklahoma and West Texas on October 14, 2026

Southern Plains severe storms are the main severe weather concern across the country on Wednesday, October 14, 2026, with the NOAA Storm Prediction Center placing Oklahoma City, Lawton and Ardmore in Oklahoma, along with Midland, Odessa…

Read More

Panama earthquake USGS ShakeMap showing M7.7 epicenter near Pitaloza Arriba on the Azuero Peninsula, October 9, 2026

Panama Earthquake: Magnitude 7.7 Strikes Near Pitaloza Arriba, USGS Issues RED Alert

USGS ShakeMap of the M7.7 Panama earthquake. The star marks the epicenter; red and orange contours show the strongest estimated shaking. Source: U.S. Geological Survey. A powerful Panama earthquake struck the Azuero Peninsula on Friday, October…

Read More

Hurricane Isaias landfall forecast track map showing the NHC cone from the Gulf of Mexico to the Alabama and Florida Panhandle coast with Gulf Coast warnings, October 9, 2026

Hurricane Isaias Landfall Expected Tonight on the Northern Gulf Coast as Storm Nears Major Hurricane Strength

Hurricane Isaias position at 7 AM CDT Friday, October 9, 2026, with the NHC forecast track and cone toward the northern Gulf Coast and active coastal and inland warnings. Map: iAlert.com Hurricane Isaias landfall is expected…

Read More

Leave a Reply