Precipitation since March 1 has been only 0.74 inch, which is 32 percent of the normal 2.28 inch.  Since the end of April, topsoil moisture in the first 8 inches has dropped 5 points to 18 percent compared to 26 percent last year at this time. Temperatures so far in May, are averaging 8 degrees warmer than normal.  Winter wheat is being stressed during the afternoon heat.  Some "burn down" is noted in a few fields.  Pastures and alfalfa growth is limited, except where irrigation is available. Tulips and lilacs are in bloom.  About half of the trees have leafed out.