Ensemble forecasts run a weather model many times with slightly different starting conditions, showing the range of possible outcomes and how confident a forecast is. These GEFS ensemble graphs from NOAA show the spread of 850hPa temperatures and pressure, 5-day averages, stratospheric data and average zonal winds, which help with spotting cold spells, settled periods and pattern changes.
Multi Model Data – 850hPa Temperature
Multi Model Data – Pressure
GEFS Average Zonal Winds
