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These parameters refer to temperature anomalies at 850hPa. They are available from T+12h to T+360h at 12-hour intervals. For the computation of anomalies a climatology derived from ECMWF's re-forecasts is used consisting of the closest single re-forecast run (11 members, 20 years back) preceding the real-time forecast date. The same climatology also replaces the outdated fixed climatology that had been used for the following (pre-existing) parameters (also for the 850hPa level):
- Probability of temperature anomaly less than -2 K
- Probability of temperature anomaly of at least greater than +2 K
- Probability of temperature anomaly less than -8 K
- Probability of temperature anomaly less than -4 K
- Probability of temperature anomaly greater than +4 K
- Probability of temperature anomaly greater than +8 K.
Please note that the The first two of the aforementioned aforementioned parameters, namely probability of temperature anomalies less than -2K and at least greater than +2K, are available only for the following forecast ranges only: T+120-240h, T+120-168h, T+168-240 and T+240-360h. The other 4 parameters are available from T+12h to T+360h at 12-hour intervals.
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