Meantime within the cold front we also see some enhancement of convection. Not bound to the insolation as the sun has already set some large cells are seen developing along the boundaries of moist and dry air (WV6.2 and Airmass). These cells also further develop and slowly die out in the morning hours while a ridge of high pressure is directing the cells towards Ukraine. Around noon on the 10th the last series of convection is developing along the Carpathian Mountains which contours can be seen quite well in all of the satellite images. The mountain ridge triggers a set of convective cells that develop rapidly and merge while moving east. Especially over the western part of Ukraine it causes some severe rainfall.
Bound to a thickness ridge the convection starts on the 10th of July. Especially in the fields of ThetaE 850 high value up to 333K are observed. These high values are soon flanked by numerous CBs. The instability is also seen in the Showalter Index with values below -3 thunderstorms are inevitable.
The radio soundings over Ukraine also show these unstable conditions. The Lifted Index for all four sounding presented are negative indicating a high chance for thunderstorms. The K-index value and CAPE where less dramatic but still give room for thunderstorm development. The night-time soundings are all marked by an inversion in the lower layers of the troposphere due to the cooling of the earth’s surface.