Natural gas in storage rose by a smaller than expected 45 billion cubic feet in the May 5 week to 2,301 bcf. The sixth consecutive weekly increase since the traditional end of the heating season puts gas stocks 13.9 percent below last year's oversized level, which was boosted by mild weather. Gas stocks are still 13.6 percent above the 5-year average, however, and well within the upper half of the historical range for this period. The E.I.A. short term energy outlook expects an increase of about 1,750 bcf through this summer's injection season, which would put inventories at the end of October below the record high end-of-injection period level set in October last year. Natural gas futures jumped about 5 cents to around $3.32 per MMBtu following the release of the report.