PLT2427

Table A-1. Definition of Common Terms Used in En Route Forecasts and Advisories (FA, SIGMET, AIRMET, TCA, VAA, ROFOR)

5.6.2.2 Public Severe Thunderstorm Watch Notification Message.The SPC issues a Public Severe Thunderstorm Watch Notification Message when forecasting six or more hail events of 1 in (quarter sized) diameter or greater or damaging winds of 50 kts (58 mph) or greater. The forecast event minimum threshold is at least 2 hours over an area of at least 8,000 mi2. Below these thresholds, the SPC, in co..

5.19.2 Graphical Turbulence Guidance (GTG).The GTG product suite provides a four-dimensional diagnosis and forecast of Non-Convective turbulence intensity (as indicated by the estimated energy dissipation to the 1/3 power–EDR in units of m2/3 s-1). GTG3 does not specifically predict turbulence associated with Convective clouds, or small-scale local terrain features, but does predict turbulence a..

5.6.1 Convective Outlooks (AC).The NWS Storm Prediction Center (SPC) issues narrative and graphical Convective outlooks to provide the CONUS NWS WFOs, the public, the media, and emergency managers with the potential for severe (tornado, wind gusts 50 kts or greater, or hail 1 in in diameter or greater) and non-severe (general) convection and specific severe weather threats during the following 8..