Base Reflectivity is the default NEXRAD weather radar image. Taken from the lowest (½° elevation) slice, it is the primary image.
The average velocity of everything in the volume of NEXRAD weather radar beam.
The Climate Prediction Center (CPC) is one of the National Centers for Environmental Prediction, which are a part of NOAA's National Weather Service. It is located in College Park, Maryland. CPC issues climate forecasts valid weeks and months in advance.
The composite reflectivity is the maximum dBZ reflectivity from any of the reflectivity angles of the NEXRAD weather radar
A forecast containing the area(s) of expected thunderstorm occurrence and expected severity over the contiguous United States, issued several times daily by the SPC. The terms marginal, slight risk, enhanced risk, moderate risk, and high risk are used to describe severe thunderstorm potential. Local versions sometimes are prepared by local NWS offices.
The height above ground of the center of the radar beam using the tilt, or scan, that contains the highest elevation where reflectivities greater than 18 dBZ can be detected.
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.
The main region of downdraft in the forward, or leading, part of a supercell, where most of the heavy precipitation is.
A narrative statement produced by the National Weather Service, frequently issued on a routine basis by a local weather forecast office (WFO), to provide information regarding the potential of significant weather expected during the next 1 to 5 days.
A rotating air mass within a thunderstorm which may produce a tornado, usually 2-6 miles in diameter and often found on the right rear flank of a supercell thunderstorm. On high-precipitation (HP) supercell, the mesocyclone may be found on the front flank. Although strictly speaking a radar term, a supercell may exhibit visual cues indicating [...]
When conditions actually begin to shape up for severe weather, SPC (Storm Prediction Center) often issues a Mesoscale Discussion (MCD) statement anywhere from roughly half an hour to several hours before issuing a weather watch. SPC also puts out MCDs for hazardous winter weather events on the mesoscale, such as locally heavy snow, blizzards and [...]
The National Weather Service (NWS) is an agency of the United States government that is tasked with providing weather forecasts, warnings of hazardous weather, and other weather-related products to organizations and the public for the purposes of protection, safety, and general information. http://www.weather.gov/ is the National Weather Service home page.
This type of National Weather Service office is responsible for issuing advisories, warnings, statements, and short term forecasts for its county warning area. For example the Dodge City WFO is responsible for the counties in southwest Kansas.
The voice of the National Weather Service, a collection of radios nationwide which broadcast important weather information.
According to the National Weather Service, Particularly Dangerous Situation (PDS) wording is used in rare situations when long-lived, strong and violent tornadoes are possible.
A thunderstorm that produces a tornado, winds of at least 58 mph (50knots), and/or hail at least 1" in diameter.
See Storm Prediction Center
Similar to base velocity, storm relative velocity takes the movement of the storm into account when calculating the average velocity of everything in the NEXRAD weather radar beam.
According to the National Weather Service, a tornado emergency is an exceedingly rare tornado warning issued when there is a severe threat to human life and catastrophic damage from an imminent or ongoing tornado.