* Traders say short squeeze suspected in late-day flurry
    * Second-month contract rose 6% 
    * Midday changes to cold weather forecasts added to rally

 
    By Scott DiSavino
    Jan 27 (Reuters) - U.S. natural gas futures soared over 70% in the last half hour of trading on Thursday,
in a late flurry of buying that coincided with the imminent expiration of the February contract at the end of
the session. 
    The contract ultimately ended up 47% in its biggest daily percentage gain on record - but on total volume
of just about 7,000 contracts, far below the next-month contract that rose a more typical 6.1% on about
156,000 contracts traded around the time the market closed.
    On average, about 336,000 futures contracts have traded on a daily basis on the New York Mercantile
Exchange (NYMEX) this week. 
    Traders cited short-covering after a larger-than-usual weekly storage draw and forecasts for
colder-than-normal weather to continue through mid-February as reasons for the late-day price spike.
    "Most folks are not playing in that contract ... because of the craziness that goes on when these
contracts go to expiration," said John Kilduff, partner at Again Capital LLC in New York. "There is no doubt
that people have gotten caught short."
    On their last day as the front-month, gas futures for February delivery rose $1.988, or 46.5%, to
settle at $6.265 per million British thermal units, the highest close since October 2021.
    Futures contracts expire on a monthly basis, and the holders of that contract are required to take
delivery of the underlying commodity, be it natural gas, oil or something else. Often, volumes decline in the
expiring contract, as people close out positions in advance to avoid taking delivery and unexpected
volatility.
    "That is why the clearinghouses usually chase those of us who don't do physical trade out of the market
long before the expiration," Kilduff said.
    The flurry of action suggested an attempt by traders to take advantage of thin volumes rather than a
changed assessment of market fundamentals.
    "Short sellers may have gotten squeezed out ahead of February expiration," said Edward Moya, senior market
analyst at OANDA. "Many hedge funds were betting natural gas would go up as frigid weather sent demand
soaring, but money managers were short." 
    Officials at the NYMEX were not immediately available for comment. 
    Traders said the price increase came after the latest midday weather forecast called for even colder
weather over the next two weeks than was previously expected.
    "Near-term weather models were revised significantly colder," said John Abeln, senior analyst, natural gas
research at Refinitiv. "The prospect of a much-colder February and very low volume in the last day of the
February contract trading were perfect ingredients for explosive volatility."
    In the spot market, frigid weather and high heating demand over the past week or so in the U.S. Northeast
have kept next-day power and gas prices in New York  and New England 
 at or near their highest levels since January 2018.
    "The market finally woke up to the fact that last week was the largest natural gas draw of the year and
weather this week points to another large draw in the report next Thursday," said one energy trader who asked
to remain anonymous.
    The U.S. Energy Information Administration (EIA) said utilities pulled a massive 219 billion cubic feet
(bcf) of gas from storage during the cold week ended Jan. 21, the biggest weekly withdrawal since last year's
February freeze cut gas supplies by freezing wells and pipes in Texas and other central states.
            
                                              Week ended     Week ended     Year ago   Five-year        
                                                Jan. 21       Jan. 14       Jan. 21     average    
                                               (Actual)       (Actual)                  Jan. 21    
 U.S. weekly natgas storage change (bcf):        -219           -206          -137        -161          
 U.S. total natgas in storage (bcf):             2,591          2,810        2,899       2,616          
 U.S. total storage versus 5-year average        -1.0%          +1.2%                                   
                                                                                                        
                                                                                                        
 Global Gas Benchmark Futures ($ per mmBtu)   Current Day     Prior Day    This Month  Prior Year   Five Year
                                                                           Last Year    Average      Average
                                                                                          2021     (2017-2021)
 Henry Hub                                       4.37           4.28          2.65        3.73        2.89
 Title Transfer Facility (TTF)                   29.97          30.08         7.27       16.01        7.47
 Japan Korea Marker (JKM)                        25.83          26.01        13.33       18.00        8.95
                                                                                                        
                                                                                                        
 Refinitiv Heating (HDD), Cooling (CDD) and Total (TDD) Degree Days                                     
 Two-Week Total Forecast                      Current Day     Prior Day    Prior Year   10-Year      30-Year
                                                                                          Norm        Norm
 U.S. GFS HDDs                                    496            493          456         429          429
 U.S. GFS CDDs                                     1              1            3           4            4
 U.S. GFS TDDs                                    497            494          459         433          433
                                                                                                        
 Refinitiv U.S. Weekly GFS Supply and Demand Forecasts                                                  
                                              Prior Week    Current Week   Next Week   This Week    Five-Year
                                                                                       Last Year   Average For
                                                                                                      Month
 U.S. Supply (bcfd)
 U.S. Lower 48 Dry Production                    93.9           93.6          94.0        91.3        84.0
 U.S. Imports from Canada                         9.3            9.4          8.9         9.8          9.2
 U.S. LNG Imports                                 0.1            0.2          0.1         0.6          0.4
 Total U.S. Supply                               103.3          103.3        103.0       101.7        93.6
                                                                                                        
 U.S. Demand (bcfd)                                                                                     
 U.S. Exports to Canada                           2.5            2.5          2.5         2.5          2.8
 U.S. Exports to Mexico                           5.7            5.8          5.5         6.1          4.9
 U.S. LNG Exports                                12.9           12.7          12.9        10.7         5.2
 U.S. Commercial                                 19.1           20.7          19.2        18.5        16.6
 U.S. Residential                                32.5           35.6          32.7        31.7        28.8
 U.S. Power Plant                                28.7           32.4          28.4        28.2        26.6
 U.S. Industrial                                 25.8           26.6          25.9        25.5        25.0
 U.S. Plant Fuel                                  4.6            4.6          4.6         4.6          4.7
 U.S. Pipe Distribution                           3.0            3.3          3.0         3.3          2.9
 U.S. Vehicle Fuel                                0.1            0.1          0.1         0.1          0.1
 Total U.S. Consumption                          113.9          123.4        114.1       111.9        104.7
 Total U.S. Demand                               134.9          144.3        134.9       131.2        117.6
                                                                                                        
                                                                                                        
 U.S. weekly power generation percent by fuel - EIA                                                
                                              Week ended     Week ended    Week ended  Week ended  Week ended
                                                Jan 28         Jan 21        Jan 7       Jan 7       Dec 31
 Wind                                              9             11            10          12          12
 Solar                                             2              2            2           2            2
 Hydro                                             7              7            7           7            8
 Other                                             2              2            2           2            2
 Petroleum                                         1              1            1           1            1
 Natural Gas                                      35             33            34          34          33
 Coal                                             26             25            24          21          20
 Nuclear                                          19             19            20          20          23
                                                                                                   
                                                                                                   
 SNL U.S. Natural Gas Next-Day Prices ($ per mmBtu)                                                     
 Hub                                          Current Day     Prior Day                                 
 Henry Hub                          4.43           4.11                                    
 Transco Z6 New York               11.24          14.66                                   
 PG&E Citygate                    4.94           4.53                                    
 Dominion South                  4.02           3.79                                    
 Chicago Citygate                  4.02           3.85                                    
 Algonquin Citygate                21.20          22.25                                   
 SoCal Citygate                  5.10           4.34                                    
 Waha Hub                        4.02           3.68                                    
 AECO                            3.40           3.04                               
                                                                                                        
 SNL U.S. Power Next-Day Prices ($ per megawatt-hour)                                                   
 Hub                                          Current Day                                               
 New England                    178.00         186.75                                   
 PJM West                        39.50          37.00                                   
 Ercot North                     39.75          40.00                                   
 Mid C                           40.75          36.31                                   
 Palo Verde                      45.25          27.75                                   
 SP-15                           47.00          41.50                                   
 


 (Reporting by Scott DiSavino in New York and Shariq Khan in Bengaluru; Editing by Mark Porter, Edmund Blair
and Jonathan Oatis)