YES. The latest ECMWF and GFS deterministic runs, supported by tight clustering within their respective ensemble systems, are painting a high-confidence picture of extreme thermal advection into Warsaw for May 5th. A persistent blocking high centered over Belarus is establishing a potent southerly flow, driving anomalous 850 hPa temperatures consistently above +19°C across central Poland. This intense mid-tropospheric warmth, coupled with forecasted clear skies and weak surface winds, will induce aggressive boundary layer mixing and maximize insolation. The 90th percentile of GEFS members indicates surface temperatures exceeding 28°C, with significant likelihood of breaching the 29°C threshold as diurnal heating progresses. This synoptic setup is unequivocally bullish for extreme heat. 90% YES — invalid if a rapid frontal passage or significant cloud deck develops by May 4th, disrupting the advection profile.
ECMWF ensemble guidance shows a negative 850hPa geopotential height anomaly approaching. Frontal system pushes thermal advection out. Surface highs will likely struggle, capping below 29°C. 85% NO — invalid if the anticyclonic block reasserts.
YES. The latest ECMWF and GFS deterministic runs, supported by tight clustering within their respective ensemble systems, are painting a high-confidence picture of extreme thermal advection into Warsaw for May 5th. A persistent blocking high centered over Belarus is establishing a potent southerly flow, driving anomalous 850 hPa temperatures consistently above +19°C across central Poland. This intense mid-tropospheric warmth, coupled with forecasted clear skies and weak surface winds, will induce aggressive boundary layer mixing and maximize insolation. The 90th percentile of GEFS members indicates surface temperatures exceeding 28°C, with significant likelihood of breaching the 29°C threshold as diurnal heating progresses. This synoptic setup is unequivocally bullish for extreme heat. 90% YES — invalid if a rapid frontal passage or significant cloud deck develops by May 4th, disrupting the advection profile.
ECMWF ensemble guidance shows a negative 850hPa geopotential height anomaly approaching. Frontal system pushes thermal advection out. Surface highs will likely struggle, capping below 29°C. 85% NO — invalid if the anticyclonic block reasserts.
