The Alberta Clipper that blasted cold air through last weekend was followed by an Atlantic coastal storm that blanketed New England with snow and wreaked havoc with airline schedules.

In addition to long lines of cranky, delayed travelers at airport Starbucks locations, natural gas has experienced spot market gyrations and benchmark climbs, while NGL prices have convulsed.

Weekly average ethane prices have soared 25.8% since mid-December at Mont Belvieu, Texas, and 30.8% at Conway, Kan. Propane jumped 6.9% then fell back 9.4% at Mont Belvieu. At Conway, the rise was 9.6% and the fall was 7.5% in that time period.