A rapid and extreme flow of high water into a normally dry area, or a rapid water level rise in a stream or creek above a predetermined flood level, beginning within six hours of the causative event
Issued to inform the public, emergency management, and other cooperating agencies that flash flooding is in progress, imminent, or highly likely.
Issued to indicate current or developing hydrologic conditions that are favorable for flash flooding in and close to the watch area, but the occurrence is neither certain or imminent.
Any high flow, overflow, or inundation by water which causes or threatens damage.
A statement of prediction
The main region of downdraft in the forward, or leading, part of a supercell, where most of the heavy precipitation is.
The altitude at which the air temperature first drops below freezing.
A condensation funnel extending from the base of a towering cumulus or cumulonimbus, associated with a rotating column of air that is not in contact with the ground.