TOPIC 1: Why are we seeing differences between operational and experimental versions of Selected Cities Weather Summary and Forecasts (SCS)?
• Q: Why do the observed data differ? A: The algorithm used to determine the previous day’s high and low temperatures is different from the algorithm used to create the legacy/operational SCS. The old method used only the 6-hourly synoptic high/low temperature reports from the METAR observations. The TPEX method uses hourly METAR temperatures in addition to those values. This allows the TPEX software to more frequently sample the daytime and nighttime periods for each city in the SCS. • Q: Why do the forecast high and low temperatures differ? A: The data that feed the legacy/operational SCS can be up to 6 hours older than the data that feed the Tabular Product Evolution in eXtensible Markup Language (TPEX) SCS. In rapidly changing forecast scenarios, a Weather Forecast Office’s (WFO’s) forecast can change quite a bit during this timeframe. For this reason, the TPEX SCS may contain some last minute updates that are not found in the official SCS products. See Table 1 for details. • Q: Wh
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