* Gas drilling rig count slips, fourth time in six weeks
* Horizontal rig count drops for second straight week (Adds price reaction, details, background)
NEW YORK, Nov 19 (Reuters) - The number of rigs drilling for natural gas in the United States slid by 19 this week to 936, according to a report on Friday by oil services firm Baker Hughes in Houston.
The gas-directed rig count, which has fallen four times in the last six weeks, hit 992 in mid-August, its highest level since February 2009 when there were 1,018 rigs drilling for gas.
Horizontal rigs -- the type most often used to extract oil or gas from shale -- dropped by eight to 932, the second straight weekly decline after hitting a record high of 943 on Nov. 5.
Analysts estimate that two-thirds of horizontal rigs are drilling for natural gas, and these comprise part of the overall rig count. The rest are drilling for oil.
Front-month U.S. natural gas futures NGc1, which were up about 13.5 cents in the $4.43 per mmBtu area just before the data were released at 1 p.m. EST (1800 GMT), hit an intraday high of $4.17 after the report.
Despite relatively low gas prices this year, gas drilling activity has been slow to react, but recent declines, particularly in the horizontal count may signal a shift away from gas to more profitable oil-related projects.
Some firms have said they will shift spending away from gas due to relatively low prices, but most analysts expect no meaningful slowdown in gas production until the second half of 2011, at the earliest.
They said some producers may continue drilling for gas to meet lease obligations, while others may be protected by profitable hedges and can still produce and sell gas at prices well above current levels.
The gas-drilling rig count is still up 271 since bottoming at 665 on July 17, 2009, its lowest since the 640 posted on May 3, 2002.
While the gas rig count is 42 percent off its record peak of 1,606 from September 2008, it stands 210 rigs, or 29 percent, above the same week last year.
Rising output from shale gas has been the primary driver of increased gas production in the last few years, and most traders agree it will be difficult to tighten the gas market unless drilling slows sharply.
Some analysts estimate the gas rig count will have to fall well below 850 to tighten the overall market.
Recent estimates by the U.S. Energy Information Administration put U.S. gas output this year at more than 22 trillion cubic feet, its highest since 1973, but next year the EIA sees output dropping 1.2 percent.
With gas inventories heading into winter at record highs and production likely to remain strong into 2011, many traders expect gas prices to remain cheap relative to oil, at least until an improving economy boosts industrial demand, which accounts for nearly 30 percent of U.S. gas consumption. (Reporting by Joe Silha;editing by Sofina Mirza-Reid)