Warm temperatures led to rapid snow melt in May, and that means lower than normal streamflows during the summer irrigation season in the Mid-Columbia.  The Natural Resources Conservation Service recently issued its June water supply outlook report.  May also brought much lower than normal precipitation, so NRCS Snow Survey Supervisor Scott Oviatt says irrigators should expect below average streamflows this summer.  Oviatt says some cooler temperatures and precipitation in June would help, but forecasts show a warming trend next week.