* Warm-up expected next week keeps buyers cautious * High inventories, record production also weigh on prices By Joe Silha NEW YORK, Feb 8 (Reuters) - Front-month U.S. natural gas futures ended slightly lower on Friday in seesaw trade, but a powerful blizzard pounding the Northeast and the colder trend in extended weather forecasts helped limit the downside. Despite Thursday's bearish weekly inventory report and the milder outlook for several days next week, traders expected heating demand to pick up when another shot of cold air moves into the Midwest later next week and then spreads east. "The forecasts for the next couple of weeks look colder than normal, but the big question is whether there's enough winter left to work down the massive amount of gas in storage," said Jonathan Lee at Ecova Inc. in Washington. Front-month gas futures on the New York Mercantile Exchange ended down 1.3 cents at $3.272 per million British thermal units after trading between $3.261 and $3.327. Futures prices tried to rally early this week, but Thursday's near 4 percent slide on bearish inventory data wiped out three days of gains and managed to turn what looked like a positive technical picture more neutral. Chart watchers said prices seem stuck in a trading range between $3.20 and $3.50. The front contract lost 0.9 percent this week following a 4.2 percent slide last week. Some traders said any move up was likely to prove difficult, with inventories still high, production flowing at or near an all-time peak and not enough sustained cold to put a serious dent in excess supplies. Commodity Weather Group said a massive snowstorm could enhance cold weather in the Northeast this weekend and delay warming trends early next week. The private forecaster also noted a colder pattern shift in the six- to 10-day outlook. DRILLING DECLINES, PRODUCTION FAILS TO SLOW Baker Hughes data on Friday showed the gas-directed drilling rig count fell this week for the fourth time in five weeks, dropping by three to 425. But while the gas rig count is hovering not far above the 13-1/2-year low of 413 hit three months ago, production has shown no significant sign of slowing. While the withdrawal widened the deficit relative to last year to 226 bcf, or 8 percent, it left storage relatively high at 351 bcf, or 15 percent, above the five-year average for that time of year. Estimates for next week's inventory report range from 128 bcf to 180 bcf. Storage fell 113 bcf during the same week last year. The five-year average decline for that week is 154 bcf. If withdrawals for the rest of winter match the five-year average, stocks will end March at 2.079 tcf, about 20 percent above normal but 16 percent below last year, when inventories finished a very mild heating season at a record high 2.48 tcf.