SPC storm ingredients: feeds current
SPC storm ingredients: Feed current; checked .
Checked means retrieved, not newly issued. Each graphic retains its issue, observation, initialization or valid time. Site publishing status is separate.
Storm ingredients: SPC’s hourly analysis
Supercell index: Supercell composite parameter (no units)
A single number SPC combines from instability, shear and helicity. Above 1 the environment can support supercells, if storms form; it does not say they will.
The technical reading
SCP = (muCAPE / 1000 J/kg) × (effective SRH / 50 m²/s²) × (effective bulk shear / 20 m/s), with SPC’s limits on each term, dimensionless. It is a diagnostic of the environment, calibrated on right-moving supercells.
An ingredient, not a forecast: SPC’s analysis of the hour, from observations and a short-range model’s first guess. No one value is a warning or an outcome; storms need several ingredients together, and something to start them.
SPC mesoanalysis checked · Data: NOAA/SPC
Not an official warning service. Warnings and watches are the National Weather Service’s, outlooks and reports the Storm Prediction Center’s and the Weather Prediction Center’s (Data: NOAA/NWS, NOAA/SPC, NOAA/WPC). When a warning is issued for you, act on it, and use weather.gov or a NOAA Weather Radio for where you are.