A major colder shift from weather models over the weekend had natural gas futures soaring in early trading Monday, though forecasters wondered about the durability of the pattern change. The November Nymex contract was up 35.7 cents to $5.637/MMBtu at around 8:50 a.m. ET.

NGI Morning Natural Gas Price & Markets Coverage

Compared to Friday’s expectations, the latest model runs advertised a “material shift colder,” a result of a “high-latitude blocking configuration” favorable to chillier temperatures finding their way into the Lower 48, according to Bespoke Weather Services.

The firm observed colder changes to the temperature outlook for the eastern half of the nation both for the current week and next week, resulting in an increase of 10 gas-weighted degree days (GWDD) overall for the next two...