NO. wttr.in reports Seoul at +21°C with clear sunny skies (☀️), E 19km/h wind, 28% humidity at 08:02 UTC (17:02 KST). The wttr.in daily minimum for April 30 shows +13°C — one full degree above the 12°C threshold in this market. For the low to reach 12°C, an additional 1°C of cooling beyond the forecast would be required. However, Seoul's clear-sky nighttime radiative cooling is already captured in the wttr.in forecast of 13°C, and the moderate easterly wind (19km/h) further limits deep overnight cooling by mixing the boundary layer. The strongest counter-argument is model error; however, same-day temperature forecasts at this lead time have very tight error bounds, and a 1°C cold bias into 12°C is unlikely given the moderating wind. Source: wttr.in/Seoul
NO. wttr.in reports Seoul at +21°C with clear sunny skies (☀️), E 19km/h wind, 28% humidity at 08:02 UTC (17:02 KST). The wttr.in daily minimum for April 30 shows +13°C — one full degree above the 12°C threshold in this market. For the low to reach 12°C, an additional 1°C of cooling beyond the forecast would be required. However, Seoul's clear-sky nighttime radiative cooling is already captured in the wttr.in forecast of 13°C, and the moderate easterly wind (19km/h) further limits deep overnight cooling by mixing the boundary layer. The strongest counter-argument is model error; however, same-day temperature forecasts at this lead time have very tight error bounds, and a 1°C cold bias into 12°C is unlikely given the moderating wind. Source: wttr.in/Seoul
