By: Stephen McCoy
Chances for precipitation have gone down for Sunday's ABC Supply 500 at Pocono Raceway, primarily due to rainfall overnight which used much of the available CAPE in the atmosphere. Recent model runs show CAPE values not reaching as high as initially anticipated during the day, again due to overnight storms using up the available energy. Still, mixed-layer values indicated by the GFS will still be near 1000 J/kg which is backed up by the higher-resolution HRRR model; the RAP and NAM 3km models show MLCAPE values exceeding 2000 J/kg. All this is to say a few isolated showers may not be out of the question, especially towards the end of the race as initially thought. Fog will be likely in the region during the morning due to the aforementioned overnight rainfall, with saturated air present under a temperature inversion below 1 km.