8th, 10th and 13th May 2015
Three separate chases that don't warrent their own individual reports - however, they each have their own remarkable aspects. After exams had finished on the 7th May, my friends and I had free time to do what we wanted - so naturally we went storm chasing! This gave the chance for other members of the group to go chasing - who hadn't previously had a chance to. Naturally, we were therefore more cautious. The 8th May was initially forecast to be a relatively unremarkable day from the SPC, although the convective outlook probabilities were ramped up significantly overnight. 
SPC convective outlook, issued at 2:00 pm Central Time, on the 8th May. 
Credit: Storm Prediction Center
The greatest risk posed from this forecast was large and damaging hail, although a few tornadoes and damaging straight-line winds were also possible from isolated supercells that developed east of a large MCS in southwestern Oklahoma and northern Texas. The increased liklihood of damaging hail made us even more cautious, as we really did not want to wreck the car! We headed down to Witicha Falls, TX and saw a few supercell features in the storms, such as rotating mesocyclones and wall clouds. We even managed to sit through the RFD of a tornado warned storm. However, the storms were high-precipitation supercells that day, and the rain and low cloud bases made it difficult to easily see the structure of the storms.
After quickly realising that the storms were merging into a very wet MCS, we decided to drive home early, before darkness fell. We let a mature squall line pass to our east and drove home northwards, behind it; through rural Oklahoma. We were rewarded with probably the most beautiful sunset that I have ever seen. At the rear of the squall line was a dramatic mammatus display, and coupled with the setting sun, this made for a spectacular scene:
Two days later, we travelled south of Dallas to intercept another moderate risk of severe weather issued by the SPC. There was a chance for tornadoes, although the greatest threats came from damaging winds and large hail. This was the first chase where all 10 of us - the Reading students - went on a chase together. We went in a convoy of two cars! 
SPC convective outlook, issued at 2:00 pm Central Time, on the 10th May. 
Credit: Storm Prediction Center
This seemed like a promising opportunity for all of us to see some good storms, especially with the high risk area being so close to the Gulf of Mexico. A tornado warned supercell developed west of Waco, TX that we were able to intercept. Unfortunately, some miscommunication between the cars meant that we punched the supercell's core twice - thankfully, we dodged the large hail, but the torrential rain (and windy roads) slowed our progress, so that we fell behind the storm. In a bid to catch up with it again, a decision was made to take a short-cut dirt road. This turned out to be more of an off-road track, and we found ourselves climbing up the side of some steep river valleys for about 10 miles! After chasing after the storm for most of the evening (and missing the tornadoes that it produced), we decided to head back north to Dallas, where we would search for accomodation.
However, by this point, the storms had aggregated to form a quasi-linear convective system, which was producing torrential rain. After attempting to drive through this, we ended up in the town of Corsicana. Unfortunately, when we arrived, most of the town was flooded due to the heavy rain. The town was battered through the night by training high-precipitation supercells, and the rain didn't stop for about 6 hours. During this time, around 9 inches of rain fell, causing serious flash flooding. This was the worst flooding I have seen, with many underpasses completely flooded with several feet of water. The local ditches and streams swelled into raging torrents, and hundreds of crayfish were washed downstream by the floodwater: I found several in a carpark, which had become a river! Unfortunately no pictures, apart from this, which sums up that evening nicely. 
On the 13th May, with nothing better to do, we decided to chase during what was easily the worst set-up we'd had. On any other day during term, nobody would have thought about chasing, but since we had set aside a week specifically for this, we went ahead and chased a marginal/slight risk issued by the SPC for central Texas. 
SPC convective outlook, issued at 2:00 pm Central Time, on the 13th May.
Credit: Storm Prediction Center
We ended up chasing a severe-warned storm in central Texas and intercepted in just south of Abilene. This supercell was mostly unremarkable, since it never looked likely to produce a tornado, although mid-level rotation was evident and there was a nice hail core at times. It was difficult to observe much structure, since the storm was high-precipitation, with rainfall obscuring most of the cloud. However, we were treated to a fantastic display of a decaying supercell as the sun set later that evening. We were able to observe the rotation of the storm and watched it decay from a supercell into a cumulus cloud in about 30 minutes.