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
Northern Mariana Islands briefing
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.