The nation’s midsection received a blast of winter as a storm dumped up to 14 inches of snow on Colorado, Kansas and Nebraska and spread record cold through the region. Five persons died in traffic accidents on slippery roads in Nebraska and Kansas. The storm stranded some travelers, and travelers’ advisories were posted in parts of Colorado and Kansas. In Denver, where 8.7 inches of snow fell Saturday, the overnight low of 17 degrees was the coldest reading ever recorded for September, breaking the old record of 20 degrees set on Sept. 19, 1971. It also broke the 112-year-old record for the date of 28 degrees.