High conviction on 'yes'. GFS and ECMWF deterministic runs for April 29th consistently indicate 850mb temperatures supportive of surface highs within the 78-79°F range, specifically showing 14-15°C across the Houston metro. A transient, weak cool frontal boundary will have cleared the region by morning, providing slightly modified continental air. This, combined with high insolation potential and minimal low-level moisture advection (dew points holding in the low 60s), will allow for efficient boundary layer mixing up to this specific range without significant overheating from southerly return flow. GEFS ensemble mean pegs the high at 78.6°F, with 70% of ensemble members clustering between 77-80°F, demonstrating tight agreement and low standard deviation. Model bias for late April often overshoots by 1-2°F in warm sectors, making 78-79°F a precise hit. 90% YES — invalid if the 12z GFS/ECMWF shift to >16°C 850mb temps on the 28th.
GFS/ECMWF ensembles project an 81°F mean for HOU on April 29. A mid-level ridge implies warmer advection. The 78-79°F window is tight and below our 80-82°F confidence band. Strong NO signal. 85% NO — invalid if frontal passage accelerates.
High conviction on 'yes'. GFS and ECMWF deterministic runs for April 29th consistently indicate 850mb temperatures supportive of surface highs within the 78-79°F range, specifically showing 14-15°C across the Houston metro. A transient, weak cool frontal boundary will have cleared the region by morning, providing slightly modified continental air. This, combined with high insolation potential and minimal low-level moisture advection (dew points holding in the low 60s), will allow for efficient boundary layer mixing up to this specific range without significant overheating from southerly return flow. GEFS ensemble mean pegs the high at 78.6°F, with 70% of ensemble members clustering between 77-80°F, demonstrating tight agreement and low standard deviation. Model bias for late April often overshoots by 1-2°F in warm sectors, making 78-79°F a precise hit. 90% YES — invalid if the 12z GFS/ECMWF shift to >16°C 850mb temps on the 28th.
GFS/ECMWF ensembles project an 81°F mean for HOU on April 29. A mid-level ridge implies warmer advection. The 78-79°F window is tight and below our 80-82°F confidence band. Strong NO signal. 85% NO — invalid if frontal passage accelerates.
