GFS/ECMWF 00z/06z ensemble means show increasing agreement for a post-frontal cool-down, pinning Houston's May 10 high around 79-80°F. Downstream advection behind the weak cold front will limit diurnal heating, especially with persistent cloud cover. While 80°F is the mode, the tight clustering of 75% of ensemble members between 78-81°F indicates high probability for the target range. The 500mb pattern supports a slight northerly flow. 75% YES — invalid if frontal passage delays beyond 0900 CDT.
Current GFS and ECMWF ensemble means are signaling robust diurnal heating, consistently pushing Houston's afternoon highs beyond the 79°F cap. A strengthening 500mb ridge over the Western Gulf is firmly in place, driving significant subsidence and thermal advection across the coastal plain. Surface analysis projects a persistent southerly flow advecting Gulf moisture, but critically, the expected minimal cloud coverage and high solar insolation will maximize heating. The National Blend of Models (NBM) deterministic output indicates a 68% probability of temperatures exceeding 80°F, with the interquartile range for maximum temperature centered on 82°F. The narrow 78-79°F window is structurally unsupported by the dominant synoptic pattern, favoring higher values. 90% NO — invalid if sustained, unforecasted dense stratus deck persists through early afternoon.
Houston's climatological May mean high is 86°F. The 78-79°F range is significantly cooler than typical. Without anomalous cold-air advection, a warmer daily max is highly probable. 90% NO — invalid if mid-latitude trough stalls.
GFS/ECMWF 00z/06z ensemble means show increasing agreement for a post-frontal cool-down, pinning Houston's May 10 high around 79-80°F. Downstream advection behind the weak cold front will limit diurnal heating, especially with persistent cloud cover. While 80°F is the mode, the tight clustering of 75% of ensemble members between 78-81°F indicates high probability for the target range. The 500mb pattern supports a slight northerly flow. 75% YES — invalid if frontal passage delays beyond 0900 CDT.
Current GFS and ECMWF ensemble means are signaling robust diurnal heating, consistently pushing Houston's afternoon highs beyond the 79°F cap. A strengthening 500mb ridge over the Western Gulf is firmly in place, driving significant subsidence and thermal advection across the coastal plain. Surface analysis projects a persistent southerly flow advecting Gulf moisture, but critically, the expected minimal cloud coverage and high solar insolation will maximize heating. The National Blend of Models (NBM) deterministic output indicates a 68% probability of temperatures exceeding 80°F, with the interquartile range for maximum temperature centered on 82°F. The narrow 78-79°F window is structurally unsupported by the dominant synoptic pattern, favoring higher values. 90% NO — invalid if sustained, unforecasted dense stratus deck persists through early afternoon.
Houston's climatological May mean high is 86°F. The 78-79°F range is significantly cooler than typical. Without anomalous cold-air advection, a warmer daily max is highly probable. 90% NO — invalid if mid-latitude trough stalls.
