Though home resales in May bounced back after April's decline, the  National Association of Realtors still concludes that the hot housing   market may be cooling.   
The rebound prompted the trade group to revise its forecast of resales  this year to 4.53 million units, from 4.35 million. But the group said   resales would "fluctuate slightly with a gradual slowdown."   
  
If sales in 1998 hit the projected level, they would be 7.5% higher than  last year's record for existing-home sales of 4.22 million. 
Forecasters have been scrambling to catch up with the market's  surprising strength all year. Last week Frederick E. Flick, vice president   of economic research at the trade group, attributed May's heavy sales to   low mortgage rates, plentiful jobs, and the confidence-building effects of   the bull stock market.       
  
The 30-year mortgage rate in early April, when borrowers likely applied  for loans to finance home sales closed in May, averaged 7.12%, according to   HSH Associates, a mortgage research firm in Butler, N.J. Rates have been a   few basis points lower in recent weeks.     
Keith Gumbinger, vice president at HSH, said the stability of interest  rates, along with their low levels, has spurred home sales, because it has   given homebuyers ample opportunity to pull together the complex   transactions.     
"In a time of great (interest rate) volatility, you have to be a very  opportunistic homebuyer," Mr. Gumbinger said. But when rates are stable,   you have more time to line up all your ducks-the down payment, the right   home, and the best loan package, he said.     
  
The ease with which borrowers can find credit, he said, has also  contributed to the buying boom. With the proliferation of loans that exceed   a home's value, subprime loans, and zero-down-payment loans, "borrowers of   almost every ilk can find funds," Mr. Gumbinger said.     
The Mortgage Bankers Association's purchase applications index, a  leading indicator of home sales, rose all spring. 
Judging by that index, "we'll get a strong existing-home sales number in  June, and July will be even stronger," said the MBA's chief economist,   David Lereah. The slowdown, if it comes, will be in the fall, he said.   
Though the Realtors expect July to be a strong month, Mr. Flick said  sales would have to be significantly higher than usual for July's   seasonally adjusted annual pace to exceed March's record of 4.8 million   units.     
  
July is traditionally when resales hit their annual peak as families  wrap up a process, often begun in the spring, in time for school openings   in August.