The USGS maintains a network of streamflow-gaging stations throughout the country. This will remain in effect until 9:15 MST tonight and include I-70 from mile markers. A second Areal Flood Advisory was issued for Grand County. A flood advisory is issued when flooding is not expected to be severe enough to warrant a warning.

Headline defining the type of flooding being addressed (e.g. See their Advanced Hydrologic Prediction Service River Forecasts and Long-Range River Flood Risk webpages. This advisory is to remain in effect until 7:15 PM. The following examples of outlooks, warning, watch, and flash flood. They use statistical models that incorporate USGS streamflow data to try to predict the results of expected storms. The National Weather Service (an agency within NOAA) collects and interprets rainfall data throughout the United States and issues flood watches and warnings as appropriate. A large portion of the area has picked up 2-5' of rain through 5pm. Such rainfall indicates the critical areal.

Knowledge about the characteristics of a river's drainage basin, such as soil-moisture conditions, ground temperature, snowpack, topography, vegetation cover, and impermeable land area, which can help to predict how extensive and damaging a flood might become. The alerts web service provides NWS watches, warnings, advisories, and similar products using the the Common Alerting Protocol (CAP) v1.2. An Areal Flood Advisory has been issued for parts of Racine, MKE, and Kenosha counties through 8:45pm for low lying flooding. When the catastrophic runoff/water level for river floods is exceeded, the primary cause of the flooding is rainfall.

Knowledge about the type of storm producing the moisture, such as duration, intensity and areal extent, which can be valuable for determining possible severity of the flooding.

The rate of change in river stage on a real-time basis, which can help indicate the severity and immediacy of the threat.

This should not be confused with 'aerial' which means of or relating to the air.

The word 'areal' refers to an area, which is an expanse of space or region of land. The word 'areal' is the adjective version of the noun 'area'. Users can view alerts on this web site, and third parties may use the API to redistribute the alerts in applications and decision support tools. The amount of rainfall occurring on a real-time basis. Basically, an Areal Flood Watch means there is the potential for flooding over a large area. The alerts web service provides NWS watches, warnings, advisories, and similar products using the the Common Alerting Protocol (CAP) v1.2.Flood predictions require several types of data:

Areal flood advisory define