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

NOAA El Nino forecast map showing warm sea surface temperature anomalies in the equatorial Pacific, June 2026

El Nino Forecast: NOAA Declares El Nino Has Formed and May Strengthen This Fall

El Nino forecast updates from NOAA confirm that El Nino has officially developed in the tropical Pacific Ocean, and federal forecasters expect it to intensify through the coming months. NOAA issued a formal El Nino Advisory…

Read More

Midwest severe thunderstorms outbreak

Midwest Severe Thunderstorms Outbreak: Tornadoes, Hurricane-Force Winds, and 400K Without Power

Midwest severe thunderstorms are producing a significant outbreak across a multistate region today, June 11, 2026, with the Storm Prediction Center declaring a Moderate Risk for parts of eastern Iowa and northern Illinois, one of the…

Read More

2026 Atlantic hurricane season forecast NOAA outlook

NOAA Forecasts Below-Normal 2026 Atlantic Hurricane Season: Why You Should Still Prepare

The 2026 Atlantic hurricane season forecast is below-normal, but that's not a reason to relax. NOAA released its 2026 Atlantic hurricane season forecast on May 21, giving the season a 55% chance of being below normal,…

Read More

Leave a Reply